393
FXUS01 KWBC 090703
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
302 AM EDT SAT SEP 09 2023
VALID 12Z SAT SEP 09 2023 - 12Z MON SEP 11 2023
...DANGEROUS HEAT WILL BUILD ACROSS THE SOUTHWEST, WHILE
CONTINUING ACROSS PARTS OF TEXAS...
...WIDESPREAD SHOWERS AND STORMS AND COOLER TEMPERATURES WILL
SPREAD ACROSS THE NORTHERN TO THE CENTRAL PLAINS AND THE UPPER TO
MID MISSISSIPPI VALLEY...
...UNSETTLED WEATHER WILL CONTINUE ACROSS THE EAST, WITH LOCALLY
HEAVY RAINFALL POSSIBLE...
IT WILL BE ANOTHER DAY OF ABOVE-NORMAL TO RECORD-BREAKING HEAT
ACROSS PORTIONS OF TEXAS AND THE SOUTHWESTERN U.S. HEAT
ADVISORIES REMAIN IN EFFECT TODAY FOR PORTIONS OF CENTRAL AND
SOUTHEASTERN TEXAS, WHERE HEAT INDICES ARE EXPECTED TO CLIMB WELL
ABOVE 100F ONCE AGAIN. THE DOME OF HIGH PRESSURE RESPONSIBLE FOR
THE RECENT HEAT ACROSS THE SOUTHERN PLAINS WILL SHIFT SLIGHTLY
WEST, RAISING TEMPERATURES ACROSS THE SOUTHWEST THIS WEEKEND. AN
EXCESSIVE HEAT WARNING IS IN EFFECT TODAY THROUGH LATE SUNDAY FOR
PORTIONS OF THE SOUTHERN CALIFORNIA AND SOUTHWESTERN ARIZONA LOWER
DESERTS, INCLUDING THE PHOENIX METRO. DAYTIME HIGHS IN THIS AREA
ARE FORECAST TO CLIMB TO AROUND 110F, WITH OVERNIGHT LOWS ONLY
DROPPING INTO THE 80S BOTH DAYS.
CONTRASTING THE HEAT IN THE SOUTHWEST, BELOW-NORMAL TEMPERATURES
WILL BEGIN TO SPREAD SOUTHEAST BEHIND A WELL-DEFINED COLD FRONT
DROPPING SOUTH FROM THE NORTHERN INTO THE CENTRAL PLAINS AND THE
UPPER INTO THE MID MISSISSIPPI VALLEY. SHOWERS AND THUNDERSTORMS
WILL ACCOMPANY THIS SYSTEM, WITH ISOLATED STRONG TO SEVERE STORMS
POSSIBLE FROM THE NORTHERN HIGH PLAINS INTO THE CENTRAL PLAINS
TODAY. AS THE SYSTEM DROPS FARTHER SOUTH ON SUNDAY, INCREASING
MOISTURE ALONG AND AHEAD OF THE FRONT WILL RAISE THE THREAT FOR
HEAVY RAINFALL AMOUNTS AND POTENTIAL FLOODING ACROSS PORTIONS OF
THE CENTRAL PLAINS.
IN THE EAST, A STALLED FRONTAL BOUNDARY WILL CONTINUE TO FOCUS
PERIODS OF SHOWERS AND THUNDERSTORMS THROUGH THE WEEKEND.
ISOLATED STRONG TO SEVERE STORMS ARE POSSIBLE, AS WELL AS HEAVY
RAIN AND LOCALIZED FLASH FLOODING.
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