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An Intense Small-Scale Wintertime Vortex In The Midwest United States, William A. Gallus Jr., James F. Bresch Nov 1997

An Intense Small-Scale Wintertime Vortex In The Midwest United States, William A. Gallus Jr., James F. Bresch

Geological and Atmospheric Sciences Publications

An intense small-scale low pressure system that moved across portions of the midwest United States is examined. The system produced a continuous band of significant snowfall, typically only 50 km wide but extending over 1500 km in length. The system traveled across the Iowa Department of Transportation surface mesonetwork, allowing high-resolution surface analyses that show a closed circulation and intense pressure gradients around the mesolow, comparable to those occurring in warm season MCS events. Radar and satellite images also revealed the small-scale low-level circulation. which apparently was confined below about 800 mb. Although the strong vorticity advection aloft and baroclinicity ...


Atmospheric Water Vapor Transport In Ncep–Ncar Reanalyses: Comparison With River Discharge In The Central United States, William J. Gutowski Jr., Yibin Chen, Zekai Ötles Sep 1997

Atmospheric Water Vapor Transport In Ncep–Ncar Reanalyses: Comparison With River Discharge In The Central United States, William J. Gutowski Jr., Yibin Chen, Zekai Ötles

Geological and Atmospheric Sciences Publications

The authors extract the water transport produced by the National Centers for Environmental Prediction reanalysis for a 10-yr period, 1984–93, and compare its convergence into two river basins with an independent dataset, river discharge (streamflow). Analysis focuses on two basins in the United States, the Upper Mississippi and the Ohio–Tennessee Basins, where the relatively high density of routine upper-air observations might be expected to give the reanalysis its closest rendition of the actual water transport. Over periods of several years, water input by the atmosphere should match water output from these basins in streamflow. However, in both basins ...


Water Vapor Layers In Storm-Fest Rawinsonde Observations, John P. Iselin, William J. Gutowski Jr. Aug 1997

Water Vapor Layers In Storm-Fest Rawinsonde Observations, John P. Iselin, William J. Gutowski Jr.

Geological and Atmospheric Sciences Publications

The STORM-FEST (Fronts Experiment Systems Test) rawinsonde data were analyzed to determine the abundance and characteristics of moist layers within the troposphere. A moist layer was defined as a local maximum in relative humidity with lower relative humidity air above and below. Moist layers under the criteria occur in over half the soundings with an average location between 600 and 500 mb and an average thickness of approximately 120 mb. The layers also appeared to be more nearly aligned with isentropic, rather than isobaric, surfaces. Compositing of relative humidity profiles with a layer at approximately the same level showed an ...


Model-Simulated Influences Of Shelterbelt Shape On Wind-Sheltering Efficiency, Hao Wang, Eugene S. Takle Jun 1997

Model-Simulated Influences Of Shelterbelt Shape On Wind-Sheltering Efficiency, Hao Wang, Eugene S. Takle

Geological and Atmospheric Sciences Publications

No abstract provided.