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Articles 1 - 15 of 15
Full-Text Articles in Meteorology
Analysis Algorithm For Sky Type And Ice Halo Recognition In All-Sky Images, Sylke Boyd, Stephen Sorenson, Shelby Richard, Michelle King, Morton Greenslit
Analysis Algorithm For Sky Type And Ice Halo Recognition In All-Sky Images, Sylke Boyd, Stephen Sorenson, Shelby Richard, Michelle King, Morton Greenslit
Physics Publications
Halo displays, in particular the 22∘ halo, have been captured in long time series of images obtained from total sky imagers (TSIs) at various Atmospheric Radiation Measurement (ARM) sites. Halo displays form if smooth-faced hexagonal ice crystals are present in the optical path. We describe an image analysis algorithm for long time series of TSI images which scores images with respect to the presence of 22∘ halos. Each image is assigned an ice halo score (IHS) for 22∘ halos, as well as a photographic sky type (PST), which differentiates cirrostratus (PST-CS), partially cloudy (PST-PCL), cloudy (PST-CLD), or clear (PST-CLR) within …
Colder By The Lake? The Lake Effect On Static Air Temperatures In Duluth, Minnesota 1961-1990, Graham A. Tobin, Gordon L. Levine, Jacqueline H. Alexander
Colder By The Lake? The Lake Effect On Static Air Temperatures In Duluth, Minnesota 1961-1990, Graham A. Tobin, Gordon L. Levine, Jacqueline H. Alexander
Journal of the Minnesota Academy of Science
To test the impact of Lake Superior on local climates, daily temperature data were collected from two weather stations in Duluth, Minnesota for the period 1961 through 1990. The broad goal of the research was to ascertain to what extent climate conditions differed between lakeside and inland locations. Temperature data were standardized to local lake-level to control for altitudinal differences between weather stations. These data were then analyzed at two temporal scales, annual and seasonal, with the focus on mean high and mean low temperatures. Results indicated that the moderating effect of the lake indeed was apparent especially in raising …
Sixty-Day Temperature Persistence At Five-Day Intervals For Minneapolis-St. Paul, Charles J. Fisk
Sixty-Day Temperature Persistence At Five-Day Intervals For Minneapolis-St. Paul, Charles J. Fisk
Journal of the Minnesota Academy of Science
The annual course of 60-day temperature persistence for Minneapolis-St. Paul, Minnesota is examined at five -clay intervals for the last 110 years. Results show maximum persistence for the 60-day periods February 20 to April 20 and June 25 to August 23. Minimum persistence is observed for sequences whose midpoints correspond to late April, late September and mid-November. This suggests the presence of a single favored regime-breaking period for the winter to summer transition and two such periods for summer to winter.
A Technique For Collecting Water Samples Under Extreme Winter Conditions, J. B. Carlson, G. E. Ahlgren
A Technique For Collecting Water Samples Under Extreme Winter Conditions, J. B. Carlson, G. E. Ahlgren
Journal of the Minnesota Academy of Science
No abstract provided.
Successive Month Temperature Relationships For Twin Cities, 1820-1974, Charles J. Fisk
Successive Month Temperature Relationships For Twin Cities, 1820-1974, Charles J. Fisk
Journal of the Minnesota Academy of Science
Using a five category classification scheme of mean monthly temperatures, the long-term ( 1820-1974) relationships between Minneapolis-St. Paul successive months' temperatures were analyzed . Results show predominance of two-month persistence over two-month breaks in classification . Strong above norma11 and below normal persistence tendencies are revealed, particularly in summer and early fall sequences. In contrast, two month breaks in classification appear in spring and fall sequences. This emphasizes the uneven progression of warming (cooling) that occasionally occurs between winter (summer) and summer (winter). Overall, strongest month-to-month association was for August-September, weakest for April-May .
Annual Precipitation Regime Of Minnesota, Richard H. Skaggs
Annual Precipitation Regime Of Minnesota, Richard H. Skaggs
Journal of the Minnesota Academy of Science
Eigenvalues and eigenvectors computed on 30-year normals indicate an unusually high spatial homogeneity of annual precipitation curve shape in Minnesota. The generalized shape accounts for about 99 per cent of the observed variance and meshes well with the overall pattern of the central United States. Interesting deviations do occur, however. These deviations suggest fundamental questions about precipitation-causing processes which should be investigated in the future.
Some Recent Advances In Meteorology, Erwin E. John
Some Recent Advances In Meteorology, Erwin E. John
Journal of the Minnesota Academy of Science
No abstract provided.
Meteorological Statistics, William Cheney, T. S. Outram
Meteorological Statistics, William Cheney, T. S. Outram
Journal of the Minnesota Academy of Science
No abstract provided.
Meteorological Statistics, William Cheney
Meteorological Statistics, William Cheney
Journal of the Minnesota Academy of Science
No abstract provided.
An Account Of The Tornado Which Visited Saint Cloud, Minnesota, April 14, 1886, C. W. Hall
An Account Of The Tornado Which Visited Saint Cloud, Minnesota, April 14, 1886, C. W. Hall
Journal of the Minnesota Academy of Science
No abstract provided.
Meteorological Statistics, William Cheney
Meteorological Statistics, William Cheney
Journal of the Minnesota Academy of Science
No abstract provided.
Notes On A Hail Storm, Occurring August 18th, 1858, Nathan Butler
Notes On A Hail Storm, Occurring August 18th, 1858, Nathan Butler
Journal of the Minnesota Academy of Science
No abstract provided.
Tornadoes And Cyclones, T. L. Rosser
Tornadoes And Cyclones, T. L. Rosser
Journal of the Minnesota Academy of Science
No abstract provided.
Notes Of A Remarkable Storm, George B. Wright
Notes Of A Remarkable Storm, George B. Wright
Journal of the Minnesota Academy of Science
No abstract provided.
Meteorological Statistics, William Cheney
Meteorological Statistics, William Cheney
Journal of the Minnesota Academy of Science
No abstract provided.