755
FXUS01 KWBC 291834
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
233 PM EDT MON JUN 29 2026
VALID 00Z TUE JUN 30 2026 - 00Z THU JUL 02 2026
...SEVERE THUNDERSTORMS POSSIBLE ACROSS THE NORTH-CENTRAL AND
NORTHEASTERN U.S. THROUGH TUESDAY...
...DANGEROUS HEAT FOR THE CENTRAL AND EASTERN U.S.; BELOW NORMAL
TEMPERATURES FOR THE WEST...
A STRENGTHENING LOW PRESSURE SYSTEM WILL TRACK ACROSS SOUTHERN
CANADA AND PUSH A FRONTAL BOUNDARY ACROSS THE NORTH-CENTRAL U.S.
OVER THE NEXT COUPLE DAYS. SEVERAL UPPER-LEVEL SHORTWAVES WILL
INTERACT WITH THE FRONT AND SUPPORT ROUNDS OF SHOWERS AND
THUNDERSTORMS FROM THE CENTRAL HIGH PLAINS TO THE UPPER MIDWEST
THROUGH TUESDAY. WARM, MOIST AIR COMBINED WITH MODERATE
INSTABILITY WILL ALLOW FOR THE DEVELOPMENT OF ISOLATED TO
SCATTERED SEVERE THUNDERSTORMS THAT WILL BE CAPABLE OF PRODUCING
DAMAGING WINDS, HAIL, AND LOCALLY HEAVY RAINFALL. SEVERE
THUNDERSTORMS WILL ALSO BE POSSIBLE IN THE NORTHEAST ON TUESDAY
EVENING AS A WARM FRONT LIFTS NORTH AND AN UPPER-LEVEL SHORTWAVE
MOVES SOUTHEAST ACROSS THE REGION.
SCATTERED SHOWERS AND THUNDERSTORMS WILL ALSO BE POSSIBLE ACROSS
THE SOUTHEAST AS A SLOW-MOVING COLD FRONT SINKS TOWARDS THE GULF
COAST AND IN PORTIONS OF TEXAS AND NEW MEXICO WHERE SOUTHEASTERLY
FLOW WILL FUNNEL GULF MOISTURE INTO A CONVERGENCE ZONE OVER THE
SOUTHERN HIGH PLAINS. LOCALLY HEAVY RAINFALL MAY RESULT IN
ISOLATED INSTANCES OF FLASH FLOODING, ESPECIALLY NEAR STEEP
TERRAIN AND IN URBAN OR POOR-DRAINAGE AREAS.
FOR THE REST OF THE CENTRAL AND EASTERN U.S., A STRENGTHENING
RIDGE OF HIGH PRESSURE WILL RESULT IN DANGEROUS HEAT THIS WEEK,
WITH HIGH TEMPERATURES IN THE 90S AND LOWER 100S. HIGH HUMIDITY
VALUES WILL RESULT IN HEAT INDICES BETWEEN 105-115 DEGREES ACROSS
THE MIDWEST AND MISSISSIPPI VALLEY THROUGH THURSDAY AND ACROSS THE
OHIO VALLEY AND EAST COAST LATER THIS WEEK. OVERNIGHT COOLING WILL
BE LIMITED BY TEMPERATURES ONLY DROPPING DOWN TO THE 70S. THE
COMBINATION OF PROLONGED DAYTIME HEATING AND LIMITED NIGHTTIME
RELIEF WILL INCREASE THE RISK OF HEAT-RELATED ILLNESSES,
ESPECIALLY FOR VULNERABLE POPULATIONS AND THOSE WITHOUT ADEQUATE
COOLING. IN THE WEST, PERSISTENT UPPER-LEVEL TROUGHING WILL RESULT
IN BELOW NORMAL TEMPERATURES ACROSS THE REGION THROUGH AT LEAST
MID-WEEK.
DOLAN/OUDIT
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