332
FXUS01 KWBC 051959
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
358 PM EDT WED AUG 05 2026
VALID 00Z THU AUG 06 2026 - 00Z SAT AUG 08 2026
...WESTERN HEAT WAVE EXPANDS INTO THE INTERMOUNTAIN WEST, ROCKIES,
AND THE CENTRAL/SOUTHERN PLAINS THROUGH THE END OF THE WEEK...
...UNSETTLED AND STORMY WEATHER CONTINUES FOR PORTIONS OF THE
SOUTHWEST AND MUCH OF THE EASTERN HALF OF THE U.S. THE NEXT FEW
DAYS...
...POOR AIR QUALITY REMAINS IN PLACE FOR PARTS OF THE PACIFIC
NORTHWEST, GREAT BASIN, INTERMOUNTAIN WEST, AND THE ROCKIES...
THE DOME OF HIGH PRESSURE WHICH BROUGHT AN EXTENDED HEAT WAVE TO
THE WESTERN U.S. THE LAST SEVERAL DAYS WILL GRADUALLY AMPLIFY
ACROSS THE GREAT BASIN, FOUR CORNERS, AND SOUTHWEST THROUGH FRIDAY
INTO SATURDAY. IN RESPONSE, INCREASINGLY HOT WEATHER WILL EXPAND
EASTWARD THROUGH THE INTERMOUNTAIN WEST, ROCKIES, AND THE
CENTRAL/SOUTHERN PLAINS, WITH HIGH TEMPERATURES SURGING WELL INTO
THE 90S AND 100S. WIDESPREAD MODERATE TO MAJOR HEATRISK IS LIKELY.
A WAVY FRONTAL BOUNDARY STRETCHING FROM THE SOUTHERN PLAINS TO THE
MIDWEST TO THE NORTHEAST WILL FOSTER THE DEVELOPMENT OF SCATTERED
SHOWERS AND THUNDERSTORMS ACROSS MUCH OF THE EASTERN U.S. THE NEXT
FEW DAYS. ALONG AND SOUTH OF THIS BOUNDARY, SOUTHERLY FLOW WILL
SUPPLY A STEADY STREAM OF GULF MOISTURE. THIS MOISTURE WHEN
COMBINED WITH STRONG DAYTIME HEATING WILL LEAD TO ELEVATED
INSTABILITY AND THE POTENTIAL FOR HIGH RAINFALL RATES. IF STORMS
ARE SLOW-MOVING OR REPEATEDLY TRAIN OVER THE SAME AREAS, ISOLATED
TO SCATTERED FLASH FLOODING WILL BE POSSIBLE, ESPECIALLY FOR
LOW-LYING, POOR DRAINAGE, AND URBAN AREAS. ANOTHER FRONT PUSHING
INTO THE UPPER MIDWEST AND WESTERN GREAT LAKES ON FRIDAY COULD
ALSO SPARK A FEW STRONG TO MARGINALLY SEVERE THUNDERSTORMS ACROSS
THE UPPER MISSISSIPPI VALLEY. ADDITIONALLY, MONSOONAL MOISTURE
WILL LIKELY PRODUCE DAILY SHOWERS AND THUNDERSTORMS WITH THE
THREAT OF LOCALLY HEAVY RAIN AND ISOLATED FLASH FLOODING OVER
PARTS OF THE SOUTHWEST DURING THE AFTERNOON AND EVENING HOURS
THROUGH THE END OF THE WEEK.
ONGOING FIRES ACROSS PARTS OF THE PACIFIC NORTHWEST, GREAT BASIN,
INTERMOUNTAIN WEST AND THE ROCKIES WILL CONTINUE TO PRODUCE LARGE
PLUMES OF DENSE AND PERSISTENT SMOKE THE NEXT SEVERAL DAYS. AS A
RESULT, AIR QUALITY WILL LIKELY REMAIN POOR FOR PARTS OF THESE
REGIONS THROUGH THE END OF THE WEEK. AIR QUALITY ALERTS REMAIN IN
EFFECT, HIGHLIGHTING THE POTENTIAL FOR ADVERSE HEALTH EFFECTS FOR
PEOPLE WHO ARE PARTICULARLY SENSITIVE TO POOR AIR QUALITY. THIS
INCLUDES CHILDREN, THE ELDERLY, AND PERSONS WITH RESPIRATORY
PROBLEMS.
MILLER
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