Early Season Snow Possible Oct 15th-16th, 2009
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Early Season Snow Possible Oct 15th-16th, 2009
A very early-season snowfall is possible across the region from late Thursday into Friday night. The main threat is to the higher-elevations of Central PA.

Synoptic Situation:
A low pressure area will move from the Mississippi Valley to the Carolina Coast by Friday morning. This will create a deep easterly flow off the Atlantic Ocean right into Central PA. The deep moisture will flow over an unseasonably cold airmass in place already. This combination should result in a very cold rain at the least, and the ridges will probably see this rain turn to a very heavy and wet snowfall. While accumulation numbers may not be significant, the high water-content of the snow will weigh down trees, and could cause power outages and travel problems.

The forecast is still rather uncertain as of Wednesday morning (Oct 14th, 2009), but the situation bears close attention, especially if you have travel plans for Central PA late this week and this weekend.

Local Climate Focal Point, John LaCorte, put together this historical perspective on early-season snowfalls:
EARLY SEASON ACCUMULATING SNOWS ARE VERY UNUSUAL BUT NOT UNHEARD
OF IN PENNSYLVANIA. SOME EARLIEST FIRST DATES OF MEASURABLE SNOW
ARE PROVIDED BELOW.

WILLIAMSPORT   OCT 16 1977  1.0"
HARRISBURG     OCT 19 1972  1.2"
STATE COLLEGE  OCT 18 1901  0.1"
WELLSBORO      OCT 17 1977  7.5"
ALTOONA        OCT 12 1988  0.2" * was earlier reported as October 13th, 1957 (0.3")
JOHNSTOWN      OCT 10 1925  0.2"
YORK           OCT 19 1972  1.5"


Read the most recent Hazardous Weather Outlook. Monitor changes in the threats visually to our region on our Hazardous Weather Monitor Page.

As this potential event nears, you can view the gridded forecast of expected snowfall.

Also see the following graphics:
NWS HPC Forecast of Surface Features and Precipitation on Thursday Evening (Oct 15th)
NWS HPC Forecast of Surface Features and Precipitation on Thursday Evening (Oct 15th)

NWS HPC Areas of Potential Heavy Snowfall (see highlighted area over Central PA).
NWS HPC Areas of Potential Heavy Snowfall (see highlighted area over Central PA).


 
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Page Last Modified: 16 October 2009 22:30:34 UTC
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