Thursday, January 06, 2011

What Exactly Does This Forecast Mean?

REST OF TONIGHT...CHANCE OF RAIN WITH POSSIBLE SLEET OR DRIZZLE LATE


IN THE EVENING...THEN DRIZZLE OR FREEZING DRIZZLE OR RAIN WITH

POSSIBLE FREEZING RAIN AND A CHANCE OF SNOW OR SLEET AFTER MIDNIGHT.

SOME NEW SNOW AND SLEET ACCUMULATION POSSIBLE. A LIGHT GLAZING

POSSIBLE. LOWS IN THE LOWER 30S. SOUTHEAST WINDS 5 TO 10 MPH. CHANCE

OF PRECIPITATION 80 PERCENT.
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Someone sent the above zone forcast to me. It was for his location's Zone Forecast during one of the recent Northeast storms. He asked: What exactly does this forecast mean for me?
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My answer was that it says there's a chance of rain, or snow, or drizzle, or freezing drizzle, or sleet during the rest of the night, and that with all this plethora of possible precipitation types there's an 80% chance that 0.01" of precipitation will occur. I may be wrong, but I think that the grid pont forecasts may drive the Zone Forecast wording, leading to this somewhat confusing forecast.

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