619
FXUS01 KWBC 071938
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
333 PM EDT WED JUN 07 2023
VALID 00Z THU JUN 08 2023 - 00Z SAT JUN 10 2023
...HAZARDOUS AIR QUALITY LEVELS WILL PERSIST ACROSS THE NORTHEAST
AND MID-ATLANTIC THROUGH THURSDAY BEFORE SHIFTING WESTWARD INTO
OHIO VALLEY ON FRIDAY...
...HEAVY RAINFALL POSSIBLE THROUGHOUT CENTRAL AND NORTHERN ROCKIES
ON WEDNESDAY; RAINFALL THREAT WILL SHIFT NORTHWARD INTO MONTANA ON
THURSDAY AND FRIDAY...
...BELOW-AVERAGE TEMPERATURES TO CONTINUE IN THE EAST AND
SOUTHWEST, WHILE PACIFIC NORTHWEST AND PLAINS STAY ABOVE-AVERAGE.
HAZARDOUS AIR QUALITY AND WIDESPREAD SMOKY CONDITIONS WILL PERSIST
THROUGH WEDNESDAY AFTERNOON AND EVENING THROUGHOUT THE NORTHEAST
AND MID-ATLANTIC AS SMOKE ASSOCIATED WITH WILDFIRES IN CANADA
CONTINUES TO PUSH SOUTHWARD INTO THE LOWER 48. AS A NEARLY
STATIONARY UPPER-LOW CHURNS OFF THE NEW ENGLAND COASTLINE,
SUSTAINED NORTHERLY WINDS WILL ALLOW THE SMOKE TO SPREAD
SOUTHWARD, WITH MAJOR METRO AREAS SUCH AS BOSTON, NEW YORK CITY,
PHILADELPHIA, AND WASHINGTON D.C. EXPECTED TO EXPERIENCE UNHEALTHY
AIR QUALITY LEVELS FOR ALL AGE GROUPS THROUGH THURSDAY, BEFORE
WINDS SHIFT MORE EASTERLY, PUSHING SMOKE FURTHER WEST INTO THE
INTERIOR NORTHEAST AND OHIO VALLEY ON FRIDAY. IT IS IMPORTANT TO
LIMIT TIME OUTDOORS, AS EXPOSURE TO AIR POLLUTANTS CAN AGGRAVATE
HEALTH PROBLEMS SUCH AS ASTHMA, HEART DISEASE, AND LUNG DISEASE.
TO ENSURE PROPER SAFETY, TAKE BREAKS WHEN POSSIBLE OR WEAR A MASK
THAT WILL HELP PROTECT YOU FROM THE SMOKE. IN ADDITION TO THE
SMOKE, BREEZY WINDS AND LOW HUMIDITY OVER PORTIONS OF THE LOWER
GREAT LAKES AND MID-ATLANTIC, WHERE CONDITIONS REMAIN VERY DRY DUE
TO A RECENT LACK OF RAINFALL, HAVE PROMPTED AN ELEVATED RISK OF
FIRE WEATHER FROM THE STORM PREDICTION CENTER THROUGH WEDNESDAY
AFTERNOON.
ELSEWHERE, THERE WILL BE NUMEROUS CHANCES FOR HEAVY RAINFALL
ACROSS THE INTERIOR PACIFIC NORTHWEST AND INTERMOUNTAIN WEST
THROUGH FRIDAY AS ANOMALOUS MOISTURE FROM THE GULF OF MEXICO
CONTINUES TO STREAM NORTHWESTWARD INTO THE REGION BETWEEN A CLOSED
LOW ACROSS THE GREAT BASIN AND AN UPPER-LEVEL RIDGE IN THE PLAINS.
WET ANTECEDENT SOIL CONDITIONS IN CONJUNCTION WITH ISOLATED HEAVY
RAINFALL RATES APPROACHING 1"/HR IN DEVELOPING THUNDERSTORMS COULD
LEAD TO FLASH FLOODING CONCERNS THROUGH WEDNESDAY AFTERNOON ACROSS
THE CENTRAL AND NORTHERN ROCKIES, RESULTING IN AN EXPANSIVE SLIGHT
RISK OF EXCESSIVE RAINFALL FOR THE REGION. THE THREAT OF HEAVY
RAINFALL WILL CONTINUE INTO THURSDAY AND FRIDAY, WITH THE PRIMARY
RISK AREA SHIFTING INTO MONTANA AND IDAHO AS THE UPPER LOW PUSHES
NORTHWARD. 48-HOUR RAINFALL TOTALS ACROSS WESTERN MONTANA MAY
APPROACH 1-2", WITH LOCALLY HEAVIER AMOUNTS POSSIBLE AS DEVELOPING
THUNDERSTORMS PRODUCE RAINFALL RATES OF UP TO 1"/HR, RESULTING IN
THE ISSUANCE OF A SLIGHT RISK OF EXCESSIVE RAINFALL FOR THE REGION
THROUGH FRIDAY.
TEMPERATURE-WISE, WITH THE AFOREMENTIONED PERSISTENT UPPER-LOW
ACROSS THE NORTHEAST, CONDITIONS WILL REMAIN COOL THROUGH THE END
OF THE WEEK WITH TEMPERATURE ANOMALIES OF 10-20 DEGREES BELOW
AVERAGE, AS DAYTIME HIGHS REMAIN IN THE UPPER 60S TO LOW 70S.
SIMILARLY, MOST OF COASTAL CALIFORNIA WILL REMAIN IN THE 60S WHILE
HIGHS WILL BE WARMER, BUT STILL BELOW AVERAGE, IN THE INTERIOR
VALLEYS AND DESERT SOUTHWEST, WITH 80S TO LOW 90S EXPECTED. IN
CONTRAST, UNDER THE RIDGING ACROSS THE PLAINS AND NORTHWEST,
TEMPERATURES WILL BE AS MUCH AS 10-20 DEGREES ABOVE AVERAGE. HIGH
TEMPERATURES ON WEDNESDAY AND THURSDAY IN THE NORTHERN PLAINS AND
INTERIOR PACIFIC NORTHWEST WILL BE IN THE UPPER 80S TO LOW 90S.
RUSSELL
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