848
FXUS01 KWBC 201947
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
346 PM EDT TUE AUG 20 2024
VALID 00Z WED AUG 21 2024 - 00Z FRI AUG 23 2024
...SEVERE THUNDERSTORMS POSSIBLE ACROSS THE CENTRAL TO NORTHERN
HIGH PLAINS THROUGH WEDNESDAY WITH FLASH FLOOD POTENTIAL
CONTINUING OVER THE SOUTHWEST...
..RECORD BREAKING HEAT CONTINUES ACROSS TEXAS
A COLD FRONT IS EXPECTED TO SLOW ITS EASTWARD PROGRESSION OFFSHORE
THE EAST COAST WHILE THE SOUTHERN TAIL BECOMES NEARLY STATIONARY
ACROSS FLORIDA, GULF OF MEXICO AND INTO THE SOUTHERN HIGH
PLAINS/ROCKIES. IN ITS WAKE HIGH PRESSURE WILL ANCHOR OVER MUCH OF
THE GREAT LAKES REGION THROUGH THE EAST, BRINGING MUCH DRIER
CONDITIONS AND GENERALLY BELOW NORMAL TEMPERATURES FOR THE NEXT
COUPLE OF DAYS. OVER THE NEXT FEW DAYS DAILY HIGH TEMPERATURES ARE
FORECAST TO BE 10 TO NEARLY 20 DEGREES COOLER FOR MID-AUGUST FOR
GREAT LAKES AND NORTHEAST. AFTERNOON HIGHS ARE EXPECTED TO TOP OUT
IN THE 60S AND 70S FOR MANY AREAS FROM THE MIDWEST TO NORTHERN
MID-ATLANTIC AND NORTHEAST. THIS HIGH PRESSURE IS EXPECTED TO
DOMINATE A MAJORITY OF THE REGION FROM THE MISSISSIPPI RIVER TO
THE APPALACHIANS FOR AT LEAST A FEW DAYS. UNDERNEATH A STRONG
UPPER LEVEL RIDGE, RECORD BREAKING HEAT WILL CONTINUE FOR AT LEAST
A COUPLE MORE DAYS ACROSS PORTIONS OF TEXAS AND SOUTHERN OKLAHOMA.
EXCESSIVE HEAT WARNINGS AND HEAT ADVISORIES REMAIN IN EFFECT AND
MANY DAILY RECORD HIGH TEMPERATURES WILL BE POSSIBLE AS
TEMPERATURES SOAR INTO THE 90S AND TRIPLE DIGITS. COMBINED WITH
THE OPPRESSIVE HUMIDITY, DAILY MAXIMUM HEAT INDICES UP TO 110F
WILL BE POSSIBLE. THIS WILL CREATE A DANGEROUS SITUATION FOR SOME
GROUPS, PARTICULARLY ANYONE SPENDING LARGE AMOUNTS OF TIME
OUTDOORS. THEY WILL BE AT A HEIGHTENED RISK OF HEAT-RELATED
ILLNESS. SOME OF THE HEAT IS EXPECTED TO SPREAD INTO EASTERN NEW
MEXICO BY THE MIDDLE/END OF THE WEEK.
THE WESTERN PERIPHERY OF THE HIGH PRESSURE AXIS WHERE THE STALLED
FRONT BOUNDARY WILL BE SETUP UP, ALONG WITH INTERACTIONS WITH
ANOTHER PASSING WEATHER SYSTEM PASSING THROUGH THE NORTHERN
ROCKIES, WILL HAVE THREATS FOR SEVERE THUNDERSTORMS ACROSS THE
CENTRAL AND NORTHERN HIGH PLAINS THROUGH WEDNESDAY. THE STORM
PREDICTION CENTER IS ADVERTISING A SLIGHT RISK (LEVEL 2 OF 5) FOR
SEVERE WEATHER INCLUDING DAMAGING WINDS AND LARGE HAIL. DEEP
MONSOONAL MOISTURE WILL PERSIST OVER THE SOUTHWEST U.S. BRINGING A
DAILY THREAT OF LOCALIZED AND ISOLATED FLASH FLOODING. SLOW MOVING
BUT INTENSE RAINFALL PRODUCING THUNDERSTORMS ARE POSSIBLE ACROSS
PORTIONS OF ARIZONA, UTAH, COLORADO, AND NEW MEXICO. FOR TODAY,
THE THREAT APPEARS TO BE FAIRLY LOCALIZED, A GREATER THREAT WILL
EXIST FOR WEDNESDAY ACROSS NORTHERN ARIZONA WHERE A SLIGHT RISK
(LEVEL 2 OF 4) OF EXCESSIVE RAINFALL AND FLASH FLOODING EXISTS.
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