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- DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023) (68)
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Articles 271 - 300 of 338
Full-Text Articles in Fresh Water Studies
Altitude, Age, And Quality Of Groundwater, Papio-Missouri River Natural Resources District, Eastern Nebraska, 1992 To 2009, Virginia L. Mcguire, Derek W. Ryter, Amanda T. Flynn
Altitude, Age, And Quality Of Groundwater, Papio-Missouri River Natural Resources District, Eastern Nebraska, 1992 To 2009, Virginia L. Mcguire, Derek W. Ryter, Amanda T. Flynn
United States Geological Survey: Water Reports and Publications
The United States Geological Survey (USGS), in cooperation with the Papio-Missouri River Natural Resources District (PMRNRD), conducted this study to map the water-level altitude of 2009 within the Elkhorn River Valley, Missouri River Valley, and Platte River Valley alluvial aquifers; to present the predevelopment potentiometric-surface altitude within the Dakota aquifer; and to describe the age and quality of groundwater in the five principal aquifers of the PMRNRD in eastern Nebraska using data collected from 1992 to 2009. In addition, implications of alternatives to the current PMRNRD groundwater-quality monitoring approach are discussed.
In the PMRNRD, groundwater altitude, relative to National Geodetic …
Droughtscape, Fall 2011, Kelly Smith
Droughtscape, Fall 2011, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
Drought Preparedness Community Options
Drought Likely to Persist, Intensify Across South
Database Will Help Planners Find Options
Impacts: Ag Losses, Fire, Water Restrictions
NDMC Welcomes International Visitors
New Drought Impact Reporter Online
Sim-Drought, Available Now at Select Agencies
Droughtscape, Summer 2011, Kelly Smith
Droughtscape, Summer 2011, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
New NDMC Website
Drought May Improve in Southeast and Southwest
Impacts Summary: Fire, Crop Loss and More
International Activities
NDMC Launches Ranch Planning Tool
Serving Data to Order
Workshop Builds Drought Planning Community
Identifying Changes In Climatic Trends And The Fingerprints Of Landuse And Landcover Changes In The High Plains Of The Usa, Denis Mutiibwa
Identifying Changes In Climatic Trends And The Fingerprints Of Landuse And Landcover Changes In The High Plains Of The Usa, Denis Mutiibwa
Department of Agricultural and Biological Systems Engineering: Dissertations, Theses, and Student Research
Human activities such as conversion of natural ecosystem to croplands and urban-centers, deforestation and afforestation impact biophysical properties of land surface such as albedo, energy balance, and surface roughness. Alterations in these properties affect the heat and moisture exchanges between the land surface and atmospheric boundary layer. The objectives of this research were; (i) to quantitatively identify the High plains’ regional climate change in temperatures over the period 1895 to 2006, (ii) detect the signatures of anthropogenic forcing of LULC changes on the regional climate change of the High Plains, and (iii) examine the trends in evolving regional latent heat …
Building A Sustainable Network Of Drought Communities, Deborah J. Bathke, Nicole Wall, Jeff Nothwehr, Kelly Helm Smith, Donna L. Woudenberg, Tonya K. Bernadt, Crystal Bergman, Joseph P. Robine, Michael Hayes, Mark Svoboda, Lisa Darby, Roger S. Pulwarty, The National Drought Mitigation Center, The National Integrated Drought Information System Program Office
Building A Sustainable Network Of Drought Communities, Deborah J. Bathke, Nicole Wall, Jeff Nothwehr, Kelly Helm Smith, Donna L. Woudenberg, Tonya K. Bernadt, Crystal Bergman, Joseph P. Robine, Michael Hayes, Mark Svoboda, Lisa Darby, Roger S. Pulwarty, The National Drought Mitigation Center, The National Integrated Drought Information System Program Office
High Plains Regional Climate Center: Staff Publications
The first step in managing large-scale (national) collaborations and networks is to consider and address how a group and a potential partnership may match up (Luther, 2005). To explore this concept and many other collaborative concepts, the National Integrated Drought Information System (NIDIS) hosted a workshop, “Building a Sustainable Network of Drought Communities,” which was facilitated by the National Drought Mitigation Center (NDMC) in Chicago, IL, June 8-9, 2011.
The workshop explored current examples of good communication and lessons learned within the realm of drought planning in order to address a future NIDIS Engaging Preparedness Communities (EPC) working group that …
Droughtscape, Spring 2011, Kelly Smith
Droughtscape, Spring 2011, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
Register Now
Forecasters Say Dryness in TX and SW to Continue
Drought Planning, The Game: Coming Soon
Ding Takes New Post
South and Southwest Lose Crops, Fight Fires
Drought Monitor Authors Review Enhanced GIS Tools and New Processes
Estimation Of Land Surface Evapotranspiration With A Satellite Remote Sensing Procedure, Ayse Kilic, Ian Ratcliffe, Pariskhit Ranade, Kenneth Hubbard, Ramesh K. Singh, Babuarao Kamble, Jeppe Kjaersgaard
Estimation Of Land Surface Evapotranspiration With A Satellite Remote Sensing Procedure, Ayse Kilic, Ian Ratcliffe, Pariskhit Ranade, Kenneth Hubbard, Ramesh K. Singh, Babuarao Kamble, Jeppe Kjaersgaard
Great Plains Research: A Journal of Natural and Social Sciences (through 2013)
There are various methods available for estimating magnitude and trends of evapotranspiration. Bowen ratio energy balance system and eddy correlation techniques offer powerful alternatives for measuring land surface evapotranspiration. In spite of the elegance, high accuracy, and theoretical attractions of these techniques for measuring evapotranspiration, their practical use over large areas can be limited due to the number of sites needed and the related expense. Application of evapotranspiration mapping from satellite measurements can overcome the limitations. The objective of this study was to utilize the METRICTM (Mapping Evapotranspiration at High Resolution using Internalized Calibration) model in Great Plains environmental …
Characteristics Of Suspended And Streambed Sediment Within Constructed Chutes And The Main Channel At Upper Hamburg And Glovers Point Bends, Missouri River, Nebraska, 2008, Brenda K. Woodward, David L. Rus
Characteristics Of Suspended And Streambed Sediment Within Constructed Chutes And The Main Channel At Upper Hamburg And Glovers Point Bends, Missouri River, Nebraska, 2008, Brenda K. Woodward, David L. Rus
United States Geological Survey: Water Reports and Publications
The Umited States Army Corps of Engineers, Omaha District, as part of the Missouri River Bank Stabilization and Navigation Mitigation Project, has constructed 17 off-channel chutes along the channelized Missouri River, downstream from Sioux City, Iowa, to increase habitat diversity. To better understand characteristics of suspended and streambed sediment within these constructed chutes, the United States Geological Survey (USGS) investigated specific aspects of chute design and function in relation to sediment characteristics including: (1) effects of inlet structures; (2) changes occurring between the inlet and the outlet of a chute; (3) effects of chutes on sediment characteristics in the main …
Sediment Samples And Channel-Geometry Data, Lower Platte River Watershed, Nebraska, 2010, Nathaniel J. Schaepe, Jason S. Alexander
Sediment Samples And Channel-Geometry Data, Lower Platte River Watershed, Nebraska, 2010, Nathaniel J. Schaepe, Jason S. Alexander
United States Geological Survey: Water Reports and Publications
The relation between channel width and stream physical habitat in the lower Platte River in eastern Nebraska was studied as part of the lower Platte River Cumulative Impact Study. The purpose of this component was to document the grain-size distribution of sediment deposited as specific types of physical features, such as sandbars, banks, and stream beds within different hydraulic habitats, within the lower Platte River system. In so doing, the major sources of sediment for sandbar creation downstream are described. Sediment samples were collected from 11 reaches of the lower Platte River from Silver Creek, Nebraska, to the mouth of …
Helicopter Electromagnetic And Magnetic Geophysical Survey Data, Swedeburg And Sprague Study Areas, Eastern Nebraska, May 2009, B. D. Smith, J. D. Abraham, J. C. Cannia, B. J. Minsley, L. B. Ball, Gregory V. Steele, M. Deszcz-Pan
Helicopter Electromagnetic And Magnetic Geophysical Survey Data, Swedeburg And Sprague Study Areas, Eastern Nebraska, May 2009, B. D. Smith, J. D. Abraham, J. C. Cannia, B. J. Minsley, L. B. Ball, Gregory V. Steele, M. Deszcz-Pan
United States Geological Survey: Water Reports and Publications
This report is a release of digital data from a helicopter electromagnetic and magnetic survey conducted by Fugro Airborne Surveys in areas of eastern Nebraska as part of a joint hydrologic study by the Lower Platte North and Lower Platte South Natural Resources Districts, and the Umited States Geological Survey (USGS). The survey flight lines covered 1,418.6 line km (882 line mile). The survey was flown from April 22 to May 2, 2009. The objective of the contracted survey was to improve the understanding of the relation between surface water and groundwater systems critical to developing groundwater models used in …
Selected Approaches To Estimate Water-Budget Components Of The High Plains, 1940 Through 1949 And 2000 Through 2009, Jennifer S. Stanton, Sharon L. Qi, Derek W. Ryter, Sarah E. Falk, Natalie A. Houston, Steven M. Peterson, Stephen M. Westenbroek, Scott C. Christenson
Selected Approaches To Estimate Water-Budget Components Of The High Plains, 1940 Through 1949 And 2000 Through 2009, Jennifer S. Stanton, Sharon L. Qi, Derek W. Ryter, Sarah E. Falk, Natalie A. Houston, Steven M. Peterson, Stephen M. Westenbroek, Scott C. Christenson
United States Geological Survey: Water Reports and Publications
The High Plains aquifer, underlying almost 112 million acres in the central United States, is one of the largest aquifers in the Nation. It is the primary water supply for drinking water, irrigation, animal production, and industry in the region. Expansion of irrigated agriculture throughout the past 60 years has helped make the High Plains one of the most productive agricultural regions in the Nation. Extensive withdrawals of groundwater for irrigation have caused water-level declines in many parts of the aquifer and increased concerns about the long-term sustainability of the aquifer.
Quantification of water-budget components is a prerequisite for effective …
Droughtscape, Winter 2011, Kelly Smith
Droughtscape, Winter 2011, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
Register for the U.S. Drought Monitor Forum
La Niña Brings Southeast, Southwest Drought
International Efforts
Drought Returns in 2010
Impacts Emerge “Before” Summer Drought in East
October-December Quarterly Impacts Summary
Climate Adaptation for Local Government
NDMC Elicits Missouri River Basin Recollections
Woudenberg Coordinates Educational Booklet
Changes In Water Levels And Storage In The High Plains Aquifer, Predevelopment To 2009, Virginia L. Mcguire
Changes In Water Levels And Storage In The High Plains Aquifer, Predevelopment To 2009, Virginia L. Mcguire
United States Geological Survey: Water Reports and Publications
The High Plains aquifer underlies 111.8 million acres (175,000 square miles) in parts of eight States—Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. The area overlying the High Plains aquifer is one of the primary agricultural regions in the Nation. Water-level declines began in parts of the High Plains aquifer soon after the onset of substantial irrigation with groundwater from the aquifer (about 1950 and termed "predevelopment" in this fact sheet). By 1980, water levels in the High Plains aquifer in parts of Texas, Oklahoma, and southwestern Kansas had declined more than 100 feet (ft) (Luckey and …
Hydrostratigraphic Interpretation Of Test-Hole And Geophysical Data, Upper Loup River Basin, Nebraska, 2008-10, Christopher M. Hobza, Theodore H. Asch, Paul A. Bedrosian
Hydrostratigraphic Interpretation Of Test-Hole And Geophysical Data, Upper Loup River Basin, Nebraska, 2008-10, Christopher M. Hobza, Theodore H. Asch, Paul A. Bedrosian
United States Geological Survey: Water Reports and Publications
Nebraska's Upper Loup Natural Resources District is currently (2011) participating in the Elkhorn-Loup Model to understand the effect of various groundwater-management scenarios on surface-water resources. During Phase 1 of the Elkhorn-Loup Model, a lack of subsurface geological information in the Upper Loup Natural Resources District, hereafter referred to as the upper Loup study area, was identified as a gap in current knowledge that needed to be addressed. To improve the understanding of the hydrogeology of the upper Loup study area, the United States Geological Survey, in cooperation with the Upper Loup Natural Resources District and the University of Nebraska Conservation …
Influence Of Karst Landscape On Planetary Boundary Layer Atmosphere: A Weather Research And Forecasting (Wrf) Model–Based Investigation, Ronnie Leeper, Rezaul Mamood, Arturo I. Quintanar
Influence Of Karst Landscape On Planetary Boundary Layer Atmosphere: A Weather Research And Forecasting (Wrf) Model–Based Investigation, Ronnie Leeper, Rezaul Mamood, Arturo I. Quintanar
High Plains Regional Climate Center: Staff Publications
Karst hydrology provides a unique set of surface and subsurface hydrological components that affect soil moisture variability. Over karst topography, surface moisture moves rapidly below ground via sink holes, vertical shafts, and sinking streams, reducing surface runoff and moisture infiltration into the soil. In addition, subsurface cave blockage or rapid snowmelt over karst can lead to surface flooding. Moreover, regions dominated by karst may exhibit either drier or wetter soils when compared to nonkarst landscape. However, because of the lack of both observational soil moisture datasets to initialize simulations and regional land surface models (LSMs) that include explicit karst hydrological …
A Synergetic Use Of Satellite Imagery From Sar And Optical Sensors To Improve Coastal Flood Mapping In The Gulf Of Mexico, Naira Chaouch, Marouane Temimi, Scott Hagen, John Weishampel, Stephen Medeiros, Reza Khanbilvardi
A Synergetic Use Of Satellite Imagery From Sar And Optical Sensors To Improve Coastal Flood Mapping In The Gulf Of Mexico, Naira Chaouch, Marouane Temimi, Scott Hagen, John Weishampel, Stephen Medeiros, Reza Khanbilvardi
United States Department of Commerce: Staff Publications
This work proposes a method for detecting inundation between semi-diurnal low and high water conditions in the northern Gulf of Mexico using high-resolution satellite imagery. Radarsat 1, Landsat imagery and aerial photography from the Apalachicola region in Florida were used to demonstrate and validate the algorithm. A change detection approach was implemented through the analysis of red, green and blue (RGB) false colour composites image to emphasise differences in high and low tide inundation patterns. To alleviate the effect of inherent speckle in the SAR images, we also applied ancillary optical data. The flood-prone area for the site was delineated …
Quantifying Canal Leakage Rates Using A Mass-Balance Approach And Heat-Based Hydraulic Conductivity Estimates In Selected Irrigation Canals, Western Nebraska, 2007 Through 2009, Christopher M. Hobza, Michael J. Andersen
Quantifying Canal Leakage Rates Using A Mass-Balance Approach And Heat-Based Hydraulic Conductivity Estimates In Selected Irrigation Canals, Western Nebraska, 2007 Through 2009, Christopher M. Hobza, Michael J. Andersen
United States Geological Survey: Water Reports and Publications
The water supply in areas of the North Platte River Basin in the Nebraska Panhandle has been designated as fully appropriated or overappropriated by the Nebraska Department of Natural Resources (NDNR). Enacted legislation (Legislative Bill 962) requires the North Platte Natural Resources District (NPNRD) and the NDNR to develop an Integrated Management Plan (IMP) to balance groundwater and surface-water supply and demand in the NPNRD. A clear understanding of the groundwater and surface-water systems is critical for the development of a successful IMP. The primary source of groundwater recharge in parts of the NPNRD is from irrigation canal leakage. Because …
Simulation Of Groundwater Flow And Effects Of Groundwater Irrigation On Stream Base Flow In The Elkhorn And Loup River Basins, Nebraska, 1895-2055: Phase Two, Jennifer S. Stanton, Steven M. Peterson, Michael N. Fienen
Simulation Of Groundwater Flow And Effects Of Groundwater Irrigation On Stream Base Flow In The Elkhorn And Loup River Basins, Nebraska, 1895-2055: Phase Two, Jennifer S. Stanton, Steven M. Peterson, Michael N. Fienen
United States Geological Survey: Water Reports and Publications
Regional groundwater-flow simulations for a 30,000-square-mile area of the High Plains aquifer, referred to collectively as the Elkhorn-Loup Model, were developed to predict the effects of groundwater irrigation on stream base flow in the Elkhorn and Loup River Basins, Nebraska. Simulations described the stream-aquifer system from predevelopment through 2005 [including predevelopment (pre-1895), early development (1895–1940), and historical development (1940 through 2005) conditions] and future hypothetical development conditions (2006 through 2033 or 2055). Predicted changes to stream base flow that resulted from simulated changes to groundwater irrigation will aid development of long-term strategies for management of hydrologically connected water supplies.
The …
Droughtscape, Fall 2010, Kelly Smith
Droughtscape, Fall 2010, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
CDC Issues Drought Guidance for Public Health
La Niña May Intensify Drought in South
Recent Workshops and Meetings
East Feels Impacts as Heat Intensifies Drought
New Products
Nicole Wall Co-Facilitates Republican River Basin Task Force
NDMC Climatologist on Ethiopia Team
Hydrogeomorphic Segments And Hydraulic Microhabitats Of The Niobrara River, Nebraska, With Special Emphasis On The Niobrara National Scenic River, Jason S. Alexander, Ronald B. Zelt, Nathaniel J. Schaepe
Hydrogeomorphic Segments And Hydraulic Microhabitats Of The Niobrara River, Nebraska, With Special Emphasis On The Niobrara National Scenic River, Jason S. Alexander, Ronald B. Zelt, Nathaniel J. Schaepe
United States Geological Survey: Water Reports and Publications
The Niobrara River is an ecologically and economically important resource in Nebraska. The Nebraska Department of Natural Resources’ recent designation of the hydraulically connected surface- and groundwater resources of the Niobrara River Basin as “fully appropriated” has emphasized the importance of understanding linkages between the physical and ecological dynamics of the Niobrara River so it can be sustainably managed. In cooperation with the Nebraska Game and Parks Commission, the United States Geological Survey USGS) investigated the hydrogeomorphic and hydraulic attributes of the Niobrara River in northern Nebraska. This report presents the results of an analysis of hydrogeomorphic segments and hydraulic …
Droughtscape, Summer 2010, Kelly Smith
Droughtscape, Summer 2010, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
Upcoming Workshops
Mild Drought Season Likely to Persist
Drought Impacts Intensify in Upper Midwest
Visiting Scientists
North Carolina Takes Drought Monitor Seriously
International Work- Murcia, Spain, June
Influence Of Canopy Cover, Nutrients, And Season On Stoichiometric Variation Of Epilithon In Neotropical Streams., Tyler J. Kohler
Influence Of Canopy Cover, Nutrients, And Season On Stoichiometric Variation Of Epilithon In Neotropical Streams., Tyler J. Kohler
School of Natural Resources: Dissertations, Theses, and Student Research
Light and nutrient availability are strong factors determining the nutrient composition of epilithon in temperate stream ecosystems. However, little work has been performed regarding this association in tropical streams. In our study, we investigated 1) how gradients of canopy cover and nutrients and 2) wet/dry seasonality influence epilithon standing stocks and nutrient quality. We surveyed 18 stream locations within six watersheds that varied in nutrient and light conditions during both the wet and dry seasons on the island of Trinidad to test these questions. Additionally, we sampled four stream reaches bimonthly for three years, thinning the canopy of two of …
Droughtscape, Spring 2010, Kelly Smith
Droughtscape, Spring 2010, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
NDMC and NC Drought Council Team Up
Drought to Intensify in Northwest and Hawaii
International Work
Impacts Recorded in Hawaii and Western States
U.S. Drought Monitor Archives Enhanced
Low-Water Impact Surveys Completed
K-12 Drought Outreach
Minimum Riparian Buffer Width For Maintaining Water Quality And Habitat Along Stevens Creek, Sammi Bray
Minimum Riparian Buffer Width For Maintaining Water Quality And Habitat Along Stevens Creek, Sammi Bray
Department of Environmental Studies: Undergraduate Student Theses
ABSTRACT Riparian buffer zones are important sites of biodiversity, sediment trapping, pollutant removal, and hydrologic regulation that have significant implications for both people and wildlife. Urbanization’s influence on and need for adequate water quality increases the need for careful planning in regards to riparian areas. Wildlife are key components in the ecosystem functions of riparian zones and require consideration in peri-urban planning as well. This study reviews relevant literature to determine the recommended minimum riparian buffer width for maintaining water quality and habitat along Stevens Creek in Lincoln, Nebraska. Only sources that listed a specific purpose related to water quality …
The Influence Of Nutrients And Physical Habitat In Regulating Algal Biomass In Agricultural Streams, Mark D. Munn, Jeffrey Frey, Anthony Tesoriero
The Influence Of Nutrients And Physical Habitat In Regulating Algal Biomass In Agricultural Streams, Mark D. Munn, Jeffrey Frey, Anthony Tesoriero
United States Geological Survey: Water Reports and Publications
This study examined the relative influence of nutrients (nitrogen and phosphorus) and habitat on algal biomass in five agricultural regions of the United States. Sites were selected to capture a range of nutrient conditions, with 136 sites distributed over five study areas. Samples were collected in either 2003 or 2004, and analyzed for nutrients (nitrogen and phosphorous) and algal biomass (chlorophyll a). Chlorophyll a was measured in three types of samples, fine-grained benthic material (CHLFG), coarse-grained stable substrate as in rock or wood (CHLCG), and water column (CHLS). Stream and riparian habitat were characterized at each site. TP ranged from …
Droughtscape, Winter 2010, Kelly Smith
Droughtscape, Winter 2010, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
USDM Forum Highlights
Drought Likely to Ease
Research Shows Birds Vulnerable to Drought
Drought Recedes in 2009
CA, TX Suffer Impacts from Ongoing Drought
NDMC Wishes Ryu Well
Conferees Pick SPI for Global Drought Index
Satellite-Based Estimation Of Chlorophyll-Α Concentration In Turbid Productive Waters, Wesley Moses
Satellite-Based Estimation Of Chlorophyll-Α Concentration In Turbid Productive Waters, Wesley Moses
School of Natural Resources: Dissertations, Theses, and Student Research
Inland, coastal, and estuarine waters, which are often turbid and biologically productive, play a crucial role in maintaining global bio-diversity and are of immense value to aquatic life as well as human-beings. Concentration of chlorophyll-a (chl-a) is a key indicator of the trophic status of these waters, which should be regularly monitored to ensure that their ecological balance is not disturbed. Remote sensing is a powerful tool for this.
Due to the optical complexity of turbid productive waters, standard algorithms that use blue and green reflectances are unreliable for estimating chl-a concentration. Algorithms based on red and near-infrared (NIR) reflectances …
Droughtscape, Fall 2009, Kelly Smith
Droughtscape, Fall 2009, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
DroughtScape, Fall 2009
Droughtscape, Summer 2009, Kelly Smith
Droughtscape, Summer 2009, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
U.S. Drought Monitor Forum, 2009
El Niño Could Bring Wet Winter After Hot Summer
Around the World
Agriculture Hit Hard in California, Texas
Predictable Patterns in Missouri River Basin?
Seeking Low-Flow Effects in Colorado, Southeast
VegDRI Began Coast-to-Coast Coverage in May
Droughtscape, Spring 2009, Kelly Smith
Droughtscape, Spring 2009, Kelly Smith
DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)
U.S. Drought Monitor Publishes Map 500!
Weakening La Niña May Mean Relief for Texas
Upcoming Workshops
Drought Impacts Worst in California, Texas
CoCoRaHS to Request Drought Impact Data, Too
NDMC Adds Researcher
K-12 Students Learn About Drought