563
FXUS01 KWBC 300800
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
359 AM EDT MON OCT 30 2023
VALID 12Z MON OCT 30 2023 - 12Z WED NOV 01 2023
...WELL BELOW AVERAGE TEMPERATURES AND RECORD-BREAKING COLD TO
CONTINUE EXPANDING FROM THE CENTRAL UNITED STATES TO THE
APPALACHIANS THROUGH THE BEGINNING OF NOVEMBER...
...SHOWER ACTIVITY TO STRETCH FROM THE SOUTHERN PLAINS TO THE
NORTHEAST TODAY, WITH ACCUMULATING SNOWFALL FORECAST ACROSS
NORTHERN MAINE...
...SNOW SQUALLS POSSIBLE ACROSS PARTS OF THE NORTHERN PLAINS,
UPPER MIDWEST, AND GREAT LAKES THROUGH HALLOWEEN...
...SANTA ANA WIND AND VERY DRY CONDITIONS ACROSS CALIFORNIA WILL
LEAD TO AN INCREASED THREAT OF WILDFIRE ACTIVITY...
A POTENT AUTUMN COLD FRONT IS SET TO COMPLETE ITS TREK ACROSS THE
CONUS BY MIDWEEK AS IT PUSHES THROUGH THE GULF COAST AND EAST
COAST STATES BY TONIGHT. IN ITS WAKE, WELL BELOW AVERAGE
TEMPERATURES UNDERNEATH STRONG HIGH PRESSURE ARE LOCATED ACROSS
THE CENTRAL UNITED STATES AND WILL CONTINUE TO SLIDE EASTWARD.
MOST IMPACTS ASSOCIATED WITH THIS LATE-OCTOBER COLD ARE IN THE
FORM OF OVERNIGHT FROST AND FREEZING TEMPERATURES. FREEZE WARNINGS
AND WATCHES EXTEND FROM CENTRAL ARIZONA THROUGH THE SOUTHERN
PLAINS AND INTO THE MIDWEST AND OHIO VALLEY, WHERE THE GROWING
SEASON IS EXPECTED TO COME TO AN END THIS WEEK. THE COLDEST
TEMPERATURES WILL BE LOCATED THROUGHOUT THE CENTRAL/NORTHERN
ROCKIES AND NORTHERN PLAINS AS LOWS DIP INTO THE TEENS AND SINGLE
DIGITS. BY WEDNESDAY MORNING, LOW TEMPERATURES INTO THE TEENS AND
20S BETWEEN THE SOUTHERN PLAINS AND CENTRAL/SOUTHERN APPALACHIANS
WILL HAVE THE POTENTIAL TO BREAK SEVERAL DAILY RECORD LOWS. THESE
TEMPERATURES ALSO EQUATE TO AROUND 20 TO 25 DEGREES BELOW AVERAGE
FOR THIS TIME OF YEAR.
THIS SAME FRONTAL BOUNDARY WILL SPREAD SCATTERED SHOWERS FROM THE
SOUTHERN PLAINS TO THE NORTHEAST TODAY WITH LINGERING WET WEATHER
OVER THE SOUTHERN MID-ATLANTIC ON TUESDAY. A DEVELOPING AREA OF
LOW PRESSURE PUSHING FROM THE MID-ATLANTIC TO THE GULF OF MAINE
WILL HELP SPREAD A WIDESPREAD PRECIPITATION SHIELD THROUGH THE
NORTHEAST TODAY THAT IS FORECAST TO OVERLAP WITH SUBFREEZING
TEMPERATURES LOCATED OVER NORTHERN MAINE. HERE, PRECIPITATION WILL
FALL AS SNOW AND COULD BE HEAVY AT TIMES. WINTER WEATHER
ADVISORIES ARE IN EFFECT DUE TO THE POTENTIAL FOR 4 TO 8 INCHES OF
SNOWFALL.
THE NEXT SYSTEM DROPPING SOUTHWARD FROM SOUTH-CENTRAL CANADA WILL
BRING THE POTENTIAL FOR SNOW SHOWERS AND SNOW SQUALLS TO PARTS OF
THE NORTHERN PLAINS TODAY. AS THIS SYSTEM PUSHES INTO THE UPPER
MIDWEST AND GREAT LAKES ON TUESDAY, ADDITIONAL SNOW SQUALLS AND
LAKE-EFFECT SNOW IS POSSIBLE. THESE SQUALLS MAY CONTAIN HIGH
SNOWFALL RATES AND RAPIDLY REDUCE VISIBILITY WHERE THEY IMPACT.
THE HEAVIEST LAKE-EFFECT SNOW IS LIKELY TO IMPACT THE KEWEENAW
PENINSULA AND OTHER AREA OF THE U.P. OF MICHIGAN, WHERE WINTER
WEATHER ADVISORIES HAVE BEEN ISSUED. ELSEWHERE, A STORM SYSTEM
APPROACHING THE PACIFIC NORTHWEST ON WEDNESDAY NIGHT WILL USHER IN
LOCALLY HEAVY RAIN TO PARTS OF NORTHWEST OREGON AND WESTERN
WASHINGTON. RAIN WILL ALSO IMPACT MOST OF THE HIGH ELEVATIONS
THROUGHOUT THE CASCADES AS SNOW LEVELS RISE ABOVE 8000 FT.
SANTA ANA WINDS ARE EXPECTED TO CONTINUE IMPACTING MUCH OF
SOUTHERN CALIFORNIA TODAY AS STRONG HIGH PRESSURE SETTLES OVER THE
GREAT BASIN AND ROCKIES. MAXIMUM WIND GUSTS UP TO UP TO 70 MPH ARE
POSSIBLE, WHICH HAS PROMPTED HIGH WIND WARNINGS THROUGHOUT THE
REGION. DRY VEGETATION AND LOW RELATIVE HUMIDITY WILL ALSO COMBINE
TO PRODUCE CRITICAL FIRE WEATHER. RESIDENTS AND VISITORS ARE
ADVISED TO USE EXTREME CAUTION WITH ANYTHING THAT CAN SPARK A
WILDFIRE.
SNELL
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