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Linking Synoptic Climatology to Hydrologic Responses in Upstate New York and Western New England. A COMET project between the University at Albany, SUNY and National Weather Service Forecast Office, Albany N.Y. Created by: David Thomas, University at Albany, SUNY. February 2003.
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Linking Synoptic Climatology to Hydrologic Responses in Upstate New York and Western New England A COMET project between the University at Albany, SUNY and National Weather Service Forecast Office, Albany N.Y. • Created by: • David Thomas, University at Albany, SUNY February 2003
Location of Stations 625 COOP stations from New York State and adjoining counties were used. Time Frame: 1951 – 2000 November through April
Definition of Wind Direction:A forecast 6 Day mean 200 hPa wind with wind direction as follows: WSW = 236.25 - 258.74 West = 258.75 - 281.24 WNW = 281.25 - 303.74
Definition of Snow Depth Change • For a particular event a COOP station was considered only if it had a snow depth loss, or no change in snow depth. Any snow depth gains were eliminated from the list. • If more than 25% of the COOP stations had a snow gain for a particular event, that event was not included in the study.
Definition of Rain on Snow • Rainfall is defined as at least 0.10 inches of rain over a given day. • In the event of mixed precipitation a 10:1 liquid water equivalent assumption was made to estimate how much precipitation fell strictly as rain.
Cumulative Frequency Charts • Based on the 277 events for Albany, New York and 365 events for Rochester, New York, that had 0.50 inches or more of 6 day SWE loss. • Based on WSW,West, and WNW wind direction. • Not all events had a 2 day rainfall.
