Linking Synoptic Climatology to Hydrologic Responses in Upstate New York and Western New England Created by: David Thomas, University at Albany, SUNY A.

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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

Elevation of Region

Albany

Rochester

Definition of Wind Direction: A forecast 6 Day mean 200 hPa wind with wind direction as follows: WSW = West = WNW =

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.

Statistics for Snow Depth Change

Statistics for Rain on Snow

Albany wind: west-southwest

Albany wind: west

Albany wind: west-northwest

Rochester wind: west-southwest

Rochester wind: west

Rochester wind: west-northwest

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.

Albany Rain on Snow Cumulative Frequency

Rochester Rain on Snow Cumulative Frequency

Albany Rain on Snow wind: west-southwest

Albany Rain on Snow wind: west

Albany Rain on Snow wind: west-northwest

Rochester Rain on Snow wind: west-southwest

Rochester Rain on Snow wind: west

Rochester Rain on Snow wind: west-northwest