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Your National Weather Service will issue special advisories/warnings during Widespread Frosts/Freezes, after the beginning - and before the end - of the "growing season":
The BEGINNING of the growing season is set by the average date of the last freeze in spring, and normally happens during very late April to mid May in Central PA.
The NWS will then issue Frost Advisories and Freeze Warnings when appropriate, until the end of the growing season, according to the following rules:
Frost Advisory: a widespread frost, which typically with mainly clear skies and light winds, and low temperatures near or slightly above freezing (33°F to 36°F).
Freeze Warning: low temperatures at or below 32°F.
The END of the growing season occurs when most of the county/NWS zone has had it's first freeze in the autumn (1/2 or more of the zone got to 32°F or below), and usually occurs in late Sep to late Oct in Central PA. As you might expect, the growing season is much shorter in the Northern Mountains than in the Lower Susquehanna Valley.
Freeze Watch: Possibility that Freeze Warning Criteria may be met at longer ranges (24 to 48 hrs out).
More Information on the NEW Wind Chill Calculation (put into use in November of 2001), and comparison to old Wind Chill Calculation.
Your National Weather Service will issue special advisories/warnings during times of High Heat Indicies:
For an outlook beyond 3-4 days, see the extended heat index guidance we get from the NWS's Hydrometeorological Prediction Center (HPC):
- Maximum HEAT INDEX OUTLOOKS (for days 3-7) from the NWS Hydrometeorological Prediction Center (HPC) in DC.
| Heat Index Calculation |
Enter in the air temperature (Tair) in degrees Fahrenheit
and relative humidity (RH) in percent (no % sign),
then click on "Get HI" to compute the heat index (HI). |
| Or Enter an Air Temp and Dew Point to get the Heat Index (HI). |
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