064 

AWUS83 KBIS 180900

RWSBIS

NDZ001>005-009-010-012-013-017>020-022-023-025-031>033-035>037-

040>044-046>048-050-051-055>062-181700-



Regional Weather Forecast

National Weather Service Bismarck ND

400 AM CDT Mon May 18 2026 /300 AM MDT Mon May 18 2026/



Temperatures will be much cooler today through Tuesday, with 

highs mostly in the 40s and 50s and lows in the 30s. Another round

of showers and thunderstorms could return this afternoon through 

tonight, with perhaps more snow mixing in the north tonight into 

Tuesday morning. Clearing skies and warming temperatures are then

expected Tuesday through Wednesday, although cold night time

temperatures Tuesday night into Wednesday morning could bring 

some areas of frost or even freeze conditions. Isolated to 

scattered showers and thunderstorms may also return Wednesday 

afternoon and evening.





$$






455 

AWUS81 KCTP 180924

RWSCTP

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-

049>053-056>059-063>066-182330-



Regional Weather Summary

National Weather Service State College PA

524 AM EDT Mon May 18 2026



Heat will be on the increase today and Tuesday under partly to

mostly sunny skies for much of the time each day. A few showers

and thunderstorms will be possible late each afternoon and into

the early evening hours, favoring south-central Pennsylvania and

the Middle Susquehanna Valley today, and the northern mountains of

the state on Tuesday. 



After a mild start to the day with daybreak temperatures in the 

50s to mid 60s, temperatures will steadily climb to the upper 80s

to mid 90s, challenging record highs for the date at many

locations. 



Select areas of enhanced heating and lift across the ridges of

south-central Pennsylvania will help to form a few mid afternoon 

to early evening showers and thunderstorms from the Laurel 

Highlands to the Susquehanna Valley. A few of the thunderstorms 

later this afternoon could produce brief wind gusts of up to 45 

mph. 



Rainfall accumulations should average below one tenth of an inch

with most locations likely staying dry. 



Partly cloudy skies and dry conditions will follow for tonight

with temperatures only slipping into the 60s for overnight lows.



A near repeat of the potentially record heat and isolated to 

scattered late day showers and thunderstorms is expected on 

Tuesday. 



A strong cold front will bring showers and scattered thunderstorms

on Wednesday, some of which could be severe in the afternoon and 

early evening across the southeastern half of the state. Cooler, 

more seasonable conditions will follow for the end of the week and

into Memorial Day weekend.



$$



Lambert