Critical Fire Weather for a Large Part of the Central U.S.; Areas of Severe Thunderstorms

Gusty to high winds and low relative humidity will bring elevated to critical fire weather across large parts of the Great Plains and more localized parts of the Great Basin and central Rockies Thursday into Friday. Severe thunderstorms with large hail and damaging wind gusts are possible over the central Plains Thursday into this weekend. Read More >

Hot Temperatures and/or High Heat Index Values

Heat Safety Information
The State College NWS Office will issue Advisories and Warnings under the header "PHLNPWCTP (WWUS71 KCTP)" for the following:
Extreme Heat Warning: Heat Index values will attain or exceed 105°F. Extreme Heat Watch: Possibility that Extreme Heat Warning Criteria may be met at longer ranges (12 to 48 hrs out).	Map of Extreme Heat Warning Criteria
Heat Advisory: Heat Index will be equal to or greater than 100°F, but less than 105°F.	Map of Heat Advisory Threshold
For an outlook beyond 3-4 days, see the extended heat index guidance we get from the NWS's Weather Prediction Center (WPC): Maximum Heat Index Outlooks

Cold Temperatures and/or Low Wind Chill Values

Cold Weather Safety Information
The State College NWS Office will issue Advisories and Warnings under the header "PHLNPWCTP (WWUS71 KCTP)" for the following:
Either wind chill or temperatures can meet these criteria (i.e. if there is light/no wind, temperatures alone can trigger these products)
Extreme Cold Warning Values of -20 F or colder along and south of I-80, and -25 F or colder for areas north of I-80	Extreme Cold Warning Map
Cold Weather Advisory Values of -10 F or colder along and south of I-80, and -15 F or colder for areas north of I-80	Cold Weather Advisory Map