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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 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:

1 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

2 Location of Stations 625 COOP stations from New York State and adjoining counties were used. Time Frame: 1951 – 2000 November through April

3 Elevation of Region

4 Albany

5 Rochester

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

7 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.

8 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.

9 Statistics for Snow Depth Change

10 Statistics for Rain on Snow

11 Albany wind: west-southwest

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13 Albany wind: west

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15 Albany wind: west-northwest

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17 Rochester wind: west-southwest

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19 Rochester wind: west

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21 Rochester wind: west-northwest

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23 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.

24 Albany Rain on Snow Cumulative Frequency

25 Rochester Rain on Snow Cumulative Frequency

26 Albany Rain on Snow wind: west-southwest

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28 Albany Rain on Snow wind: west

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30 Albany Rain on Snow wind: west-northwest

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32 Rochester Rain on Snow wind: west-southwest

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34 Rochester Rain on Snow wind: west

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36 Rochester Rain on Snow wind: west-northwest

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