492
FXUS61 KLWX 180627
AFDLWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
227 AM EDT THU SEP 18 2025
SYNOPSIS
LOW PRESSURE DISSIPATES OFFSHORE OF THE MID-ATLANTIC TODAY AS HIGH
PRESSURE BUILDS IN THROUGH THE REST OF THE WEEK. A COLD FRONT MOVES
THROUGH FRIDAY NIGHT, THEN ANOTHER HIGH PRESSURE BUILDS IN THROUGH
EARLY NEXT WEEK.
NEAR TERM /THROUGH TODAY/
A WEAKENING LOW PRESSURE OVER THE VIRGINIA TIDEWATER WILL SLOWLY
DRIFT OFFSHORE AND DISSIPATE TODAY. ABUNDANT CLOUD COVER, DRIZZLE,
AND FOG EARLY THIS MORNING WILL START TO BURN OFF AFTER SUNRISE.
WEAK HIGH PRESSURE BUILDS OVER THE REGION FOR THE NEXT COUPLE OF
DAYS. DRY CONDITIONS ARE EXPECTED THIS AFTERNOON AS LIGHT NORTHWEST
WINDS PREVAIL. ABOVE NORMAL TEMPERATURES TODAY AS HIGHS REACH THE
LOW TO MID 80S. MOSTLY CLEAR SKIES TONIGHT AS LOWS SETTLE IN THE
MID 50S TO LOW 60S.
SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/
MID-LEVEL RIDGING BUILDS OVER THE OH VALLEY FRIDAY, THEN MOVES EAST
ACROSS THE MID-ATLANTIC TO EASTERN GREAT LAKES REGION. THIS HELPS
BRING ABOUT WELL ABOVE NORMAL TEMPERATURES FRIDAY AFTERNOON AS HIGHS
REACH THE MID TO UPPER 80S. DRY CONDITIONS AND LIGHT NORTHWEST WINDS
CONTINUE. A DRY COLD FRONT MOVES THROUGH FRIDAY NIGHT, THOUGH NO
SIGNIFICANT AIRMASS CHANGES ARE EXPECTED BEHIND THE FRONT.
A STRONG CANADIAN HIGH PRESSURE BUILDS FROM ONTARIO INTO NEW ENGLAND
ON SATURDAY. THIS USHERS IN THE RETURN OF EASTERLY FLOW AND
INCREASED MARINE STRATOCU OVER THE AREA. HIGHS SATURDAY WILL BE AT
NORMAL VALUES FOR MID/LATE SEPTEMBER IN THE UPPER 70S TO AROUND 80F.
A FEW SHOWERS ARE POSSIBLE IN THE ALLEGHENIES SATURDAY AFTERNOON,
THOUGH CONDITIONS ARE LIKELY TO BE DRY FOR THE MOST PART. MILD
CONDITIONS SATURDAY NIGHT WITH TEMPS MOSTLY IN THE 60S.
LONG TERM /SUNDAY THROUGH WEDNESDAY/
A WEAK BOUNDARY WILL SPREAD A SHOWER OR TWO TO PARTS OF THE AREA
SUNDAY. HIGH TEMPERATURES WILL BE IN THE UPPER 70S TO LOWER 80S.
SUNDAY NIGHT'S LOWS WILL DROP INTO THE 50S AND 60S.
HIGH PRESSURE WILL BUILD INTO THE REGION MONDAY AND TUESDAY,
RESULTING IN DRY CONDITIONS AND WARMER TEMPERATURES. THE NEXT CHANCE
FOR SHOWERS WILL BE TUESDAY NIGHT AND INTO THE DAY ON WEDNESDAY AS A
BOUNDARY MOVES INTO REGION. MOST OF THE SHOWER ACTIVITY THAT COULD
OCCUR WOULD BE MORE LIKELY IN THE WESTERN ZONES AS DRY AIR MAY HOLD
IN PLACE IN THE CENTRAL AND EASTERN AREAS. HIGH TEMPERATURES LOWER
80S MONDAY AND LOWER TO MIDDLE 80S ON TUESDAY. WEDNESDAY SHOULD
REACH THE 80S AS WELL.
AVIATION /06Z THURSDAY THROUGH MONDAY/
A WEAK LOW PRESSURE OVER SOUTHEAST VIRGINIA IS PRODUCING WIDESPREAD
LOW CLOUDS AND FOG THIS MORNING. IMPACTS ARE ONGOING AT ALL
TERMINALS, WITH WIDESPREAD IFR TO LIFR CONDITIONS. CLOUDS AND FOG
START TO BURN OFF AFTER SUNRISE, WITH VFR CONDITIONS RETURNING BY
EARLY AFTERNOON AT THE LATEST. BEYOND THIS MORNING, VFR CONDITIONS
ARE EXPECTED TO PREVAIL THROUGH SATURDAY.
VFR CONDITIONS SUNDAY THROUGH MONDAY NIGHT. WINDS GENERALLY
SOUTHEAST 5 TO 10 KNOTS THROUGH THE PERIOD.
MARINE
NORTHERLY WINDS ARE DIMINISHING OVER THE WATERS THIS MORNING, AND
ARE EXPECTED TO REMAIN WELL BELOW SCA LEVELS THROUGH FRIDAY NIGHT. A
COLD FRONT MOVES ACROSS THE WATERS EARLY SATURDAY MORNING. NORTHERLY
CHANNELING BEHIND THE FRONT COULD RESULT IN NEAR SCA CONDITIONS OVER
PORTIONS OF THE CHESAPEAKE BAY SATURDAY MORNING AND AGAIN SATURDAY
EVENING.
NO MARINE HAZARDS SUNDAY THROUGH MONDAY NIGHT. WINDS GENERALLY
SOUTHEAST 10 KNOTS GUSTS UP TO 15 KNOTS THROUGH THE PERIOD.
TIDES/COASTAL FLOODING
TIDAL ANOMALIES REMAIN ELEVATED THIS MORNING, WITH SOME SENSITIVE
LOCATIONS REACHING MINOR FLOOD DURING HIGH TIDE. COASTAL FLOOD
ADVISORIES REMAIN IN EFFECT FOR ANNAPOLIS FOR THE MORNING HIGH TIDE.
AFTER THAT, TIDAL ANOMALIES ARE EXPECTED TO DECREASE AS WINDS TURN
OUT OF THE NORTH TO NORTHWEST THROUGH THE WEEKEND.
LWX WATCHES/WARNINGS/ADVISORIES
DC...NONE.
MD...COASTAL FLOOD ADVISORY UNTIL 8 AM EDT THIS MORNING FOR MDZ014.
VA...NONE.
WV...NONE.
MARINE...NONE.
SYNOPSIS...KRR
NEAR TERM...KRR
SHORT TERM...KRR
LONG TERM...KLW
AVIATION...KRR/KLW
MARINE...KRR/KLW
TIDES/COASTAL FLOODING...KRR
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