Presentation on theme: "Linking Synoptic Climatology to Hydrologic Responses in Upstate New York and Western New England Created by: David Thomas, University at Albany, SUNY A."— Presentation transcript:
Linking Synoptic Climatology to Hydrologic Responses in Upstate New York and Western New England Created by: David Thomas, University at Albany, SUNY A COMET project between the University at Albany, SUNY and National Weather Service Forecast Office, Albany N.Y. 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.