132  
FXUS01 KWBC 180648  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
248 AM EDT WED JUN 18 2025  
 
VALID 12Z WED JUN 18 2025 - 12Z FRI JUN 20 2025  
 
...SEVERE THUNDERSTORM RISKS FOR THE MIDWEST & LOWER GREAT LAKES  
ON WEDNESDAY, & THE MID-ATLANTIC STATES THURSDAY...  
 
...FIRE WEATHER CONCERNS AND/OR SIGNIFICANT HEAT FOR PORTIONS OF  
THE WEST, ROCKIES, & CENTRAL HIGH PLAINS THROUGH FRIDAY...  
   
..HEAT BUILDS IN THE EAST THROUGH THURSDAY  
 
THE WEATHER MAKER FOR THE EASTERN HALF OF THE COUNTRY THROUGH  
FRIDAY WILL BE A PROGRESSIVE UPPER LEVEL DISTURBANCE AND COLD  
FRONT PUSHING ACROSS THE PLAINS AND THE EAST. A WAVE OF LOW  
PRESSURE WAVE IN THE PLAINS IS FORECAST TO INTENSIFY AND TRACK  
NORTHEAST THROUGH THE MIDWEST ON WEDNESDAY, WHICH BRINGS A THREAT  
OF SEVERE THUNDERSTORMS AND FLASH FLOODING FROM THE SOUTHERN  
PLAINS ACROSS THE MIDWEST/OHIO VALLEY AND INTO THE GREAT LAKES.  
THE APPALACHIANS, MID-ATLANTIC STATES, AND NEW ENGLAND STATES WILL  
SEE INCREASING HEAT THROUGH THURSDAY AS A RIDGE OF HIGH PRESSURE  
BRIEFLY BUILDS ACROSS THE REGION AND A WARM FRONT LIFTS NORTH OF  
THE AREA. RECORD HIGH TEMPERATURES...IN THE MID 90S...ARE  
POSSIBLE IN SOUTHERN NEW ENGLAND ON THURSDAY. ONCE THE COLD FRONT  
NEARS THE EAST ON THURSDAY, MORE WIDESPREAD SEVERE WEATHER WOULD  
BE POSSIBLE WITHIN THE INCREASINGLY HOT AND HUMID AIR MASS ACROSS  
THE MID-ATLANTIC STATES AND NEW ENGLAND. A WANING AREA OF  
THUNDERSTORMS IS EXPECTED WITH TIME AS A COLD FRONT LEADS TO  
COOLING AND DRIES THINGS OUT, CLEARING THE MIDWEST BY THURSDAY AND  
THE MID-ATLANTIC AND NEW ENGLAND STATES BY FRIDAY. THE GULF COAST  
AND SOUTHEAST MAINTAIN SCATTERED SHOWERS AND THUNDERSTORMS FOR THE  
REMAINDER OF THE WORK WEEK.  
 
A DEEP LAYER CYCLONE MOVES SOUTHEAST WITH TIME OUT OF THE  
NORTHEAST PACIFIC, WITH THE CENTER MOVING INTO THE PACIFIC  
NORTHWEST ON FRIDAY. IT WILL DRIVE A COLD FRONT EAST AND SOUTH  
THROUGH THE PACIFIC NORTHWEST AND MONTANA BY FRIDAY MORNING. THE  
COMBINATION OF WINDY AND DRY CONDITIONS BRINGS AN ELEVATED FIRE  
WEATHER THREAT ACROSS INTERIOR PORTIONS OF THE NORTHWEST ON  
WEDNESDAY (WHERE RED FLAG WARNINGS ARE IN EFFECT), WHICH SHIFTS  
INTO THE GREAT BASIN ON THURSDAY AND FRIDAY (RED FLAG WARNINGS ARE  
IN EFFECT FOR MUCH OF UTAH). SIGNIFICANT HEAT EXPANDS ACROSS THE  
WEST INTO THE CENTRAL HIGH PLAINS ON WEDNESDAY THROUGH FRIDAY  
AHEAD OF THE COLD FRONT AS THE RIDGE REBUILDS AHEAD OF THE DEEP  
LAYER CYCLONE, THREATENING DAILY RECORD HIGH TEMPERATURES ACROSS  
PORTIONS OF THE GREAT BASIN AND WESTERN SOUTH DAKOTA ON THURSDAY  
AND FROM COLORADO NORTH AND EAST INTO NEBRASKA AND SOUTH DAKOTA ON  
FRIDAY. HIGH TEMPERATURES WILL REMAIN 100F+ FOR THE DESERT  
SOUTHWEST THROUGH THE REMAINDER OF THE WORK WEEK (DEATH VALLEY  
COULD EXCEED 120F) WHERE EXTREME HEAT WARNINGS REMAIN IN EFFECT.  
HEAT ADVISORIES REMAIN IN EFFECT FOR SOUTHERN AND WESTERN FRINGES  
OF THE BIG BEND OF WESTERN TEXAS ON WEDNESDAY WHERE HIGH  
TEMPERATURES OF 100-110F ARE FORECAST.  
 
ROTH/MILLER  
 
GRAPHICS AVAILABLE AT  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 
 
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