670  
FXUS01 KWBC 300801  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
400 AM EDT SUN JUN 30 2024  
 
VALID 12Z SUN JUN 30 2024 - 12Z TUE JUL 02 2024  
 
...DANGEROUSLY HOT CONDITIONS WILL CONTINUE FOR THE SOUTHEAST  
THROUGH THE END OF THE WEEKEND, WHILE SIMMERING HEAT BUILDS ACROSS  
THE SOUTHERN PLAINS AND CALIFORNIA'S CENTRAL VALLEY EARLY THIS  
WEEK...  
 
...SEVERE THUNDERSTORM AND HEAVY RAIN THREAT FOR THE EAST COAST  
TODAY...  
 
...SHOWERS AND THUNDERSTORMS FOR THE FOUR CORNERS/SOUTHWEST OVER  
THE NEXT FEW DAYS; WET WEATHER RETURNS TO THE UPPER MIDWEST BY  
MONDAY...  
 
THE TRANSITION TO JULY WILL CONTINUE TO FEATURE AREAS OF  
POTENTIALLY DANGEROUS HEAT THROUGHOUT PARTS OF THE SOUTHERN U.S.  
AND CALIFORNIA. AT THE UPPER LEVELS, HIGHER PRESSURE OVER THE  
SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY WILL FOCUS MUCH OF  
THE HEAT OVER THE SOUTH-CENTRAL U.S. OVER THE NEXT FEW DAYS BEFORE  
RIDGING BEGINS TO BUILD TOWARD THE WEST COAST BY TUESDAY. THIS  
EQUATES TO HIGH TEMPERATURES IN THE MID-TO-UPPER 90S TODAY FROM  
THE MID-ATLANTIC TO THE SOUTHERN PLAINS. THIS LEVEL OF HEAT AND  
THE POTENTIAL FOR MAXIMUM TEMPERATURES INTO THE LOW 100S ARE  
EXPECTED TO REMAIN THROUGHOUT THE SOUTH-CENTRAL U.S. THROUGH AT  
LEAST TUESDAY, WHILE MUCH OF THE SOUTHEAST AND MID-ATLANTIC COOLS  
OFF BEHIND A COLD FRONT. OVERNIGHT TEMPERATURES ARE EXPECTED TO BE  
QUITE WARM OVER THE SOUTHERN PLAINS AND NOT OFFER MUCH TIME FOR  
RELIEF AFTER SCORCHING DAYTIME TEMPERATURES. IN FACT, SEVERAL  
DAILY WARM MINIMUM TEMPERATURE RECORDS COULD BE BROKEN/TIED OVER  
THE NEXT FEW DAYS IN THIS REGION. EXCESSIVE HEAT WARNINGS AND HEAT  
ADVISORIES CURRENTLY STRETCH FROM TEXAS TO NEW JERSEY. FOR  
CALIFORNIA, A DANGEROUS AND LONG-DURATION HEAT EVENT IS FORECAST  
TO BEGIN ON TUESDAY AS HIGH TEMPERATURES SOAR INTO THE TRIPLE  
DIGITS, WHICH HAS PROMPTED EXCESSIVE HEAT WARNINGS AND WATCHES TO  
BE POSTED. THESE READINGS WILL IMPACT INTERIOR VALLEY LOCATIONS  
AND AREAS AWAY FROM THE IMMEDIATE COASTLINE. RESIDENTS AND  
VISITORS ARE URGED TO FOLLOW PROPER HEAT SAFETY AS THIS LEVEL OF  
HEAT COULD BE DEADLY FOR ANYONE WITHOUT EFFECTIVE COOLING.  
 
THUNDERSTORMS AND INSTANCES OF HEAVY RAIN ARE FORECAST TO IMPACT  
PARTS OF THE EAST COAST, MIDWEST, AND FOUR CORNERS/SOUTHWEST OVER  
THE NEXT FEW DAYS. A POTENT COLD FRONT USHERING IN A COMFORTABLE  
AIRMASS TO THE GREAT LAKES AND MIDWEST TODAY WILL CONTINUE TO TREK  
TOWARDS THE EAST COAST WHILE SPARKING NUMEROUS SHOWERS AND  
THUNDERSTORMS. A FEW STORMS COULD TURN SEVERE BETWEEN MAINE AND  
THE CAROLINAS, WITH DAMAGING WIND GUSTS THE PRIMARY WEATHER  
HAZARD. HEAVY RAIN COULD ALSO LEAD TO ISOLATED FLASH FLOODS  
BETWEEN NEW ENGLAND AND THE SOUTHEAST. THIS SAME FRONTAL BOUNDARY  
IS ANTICIPATED TO FOCUS ADDITIONAL THUNDERSTORM CHANCES ON MONDAY  
ACROSS THE SOUTHEAST. THE FLASH FLOOD THREAT IS EXPECTED TO BE  
HIGHEST ACROSS COASTAL SOUTH CAROLINA AND SOUTHEAST GEORGIA, WHERE  
SLOW-MOVING STORMS COULD PRODUCE A FEW INCHES OF RAINFALL IN A  
VERY SHORT PERIOD OF TIME.  
 
THE OTHER NOTABLE WEATHER SYSTEM IMPACTING THE LOWER 48 AT THE  
MIDWAY POINT OF THE YEAR IS FORECAST TO PUSH FROM THE  
INTERMOUNTAIN WEST TO THE UPPER MIDWEST BY EARLY THIS WEEK.  
LINGERING RAINFALL CHANCES AND THE POTENTIAL FOR FLASH FLOODING IS  
EXPECTED TO CONTINUE AS THE UPPER TROUGH TRAVERSING THE WESTERN  
U.S. MAINTAINS A FRESH FLOW OF MOISTURE-RICH AIR INTO THE  
SOUTHWEST AND SOUTHERN ROCKIES. FLASH FLOOD WATCHES REMAIN IN  
EFFECT ACROSS PARTS OF NEW MEXICO, COLORADO, AND UTAH. ON THE DRY  
SIDE OF THE SYSTEM, GUSTY WINDS AND LOW RELATIVE HUMIDITY ARE  
ANTICIPATED TO CREATE CRITICAL FIRE WEATHER ACROSS PARTS OF THE  
CENTRAL GREAT BASIN TODAY. MEANWHILE, AREAS OF ROBUST  
THUNDERSTORMS COULD TURN SEVERE BY THIS EVENING THROUGHOUT THE  
NORTHERN HIGH PLAINS AS AN AREA OF LOW PRESSURE DEVELOPS. THIS LOW  
PRESSURE SYSTEM IS THEN FORECAST TO SPREAD UNSETTLED WEATHER INTO  
THE NORTHERN PLAINS AND UPPER MIDWEST ON MONDAY. SCATTERED SEVERE  
THUNDERSTORMS ARE POSSIBLE, WITH AN ELEVATED THREAT FOR TORNADOES,  
DAMAGING WIND GUSTS, AND LARGE HAIL OVER PARTS OF CENTRAL  
NEBRASKA. FOR THE UPPER MIDWEST, ANY HEAVY RAIN WILL BE UNWELCOME  
AS ONGOING RIVER FLOODING IMPACTS THE REGION. ANY ADDITIONAL  
RAINFALL COULD EXACERBATE FLOODING CONCERNS, WITH THE POTENTIAL  
FOR NUMEROUS THUNDERSTORMS CREATING AN INCREASING FLASH FLOOD RISK  
FOR THIS PART OF THE COUNTRY. AS THE SYSTEM CONTINUES TO PROGRESS  
EASTWARD ON TUESDAY AND AN ATTACHED COLD FRONT SLOWS ITS FORWARD  
PROGRESS OVER THE MIDWEST AND CENTRAL PLAINS, ADDITIONAL CHANCES  
FOR SEVERE WEATHER AND HEAVY RAIN ARE EXPECTED TO CONTINUE.  
 
SNELL  
 
GRAPHICS AVAILABLE AT  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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