Dense Fog in Virginia, August 29 to 30, 2011

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
750 PM EDT MON AUG 29 2011

.SYNOPSIS...
AN UPPER-LEVEL TROUGH WILL PASS THROUGH THE AREA TONIGHT. HIGH
PRESSURE WILL BUILD IN BEHIND THIS SYSTEM FOR THE MIDDLE PORTION
OF THE WEEK BEFORE MOVING OFFSHORE LATE INT HE WEEK. A COLD FRONT
WILL APPROACH THE REGION SUNDAY.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
AN UPPER-LEVEL TROUGH CURRENTLY LOCATED OVER THE REGION WILL
SLOWLY PUSH OFF TO OUR EAST LATE TONIGHT. MID-LEVEL CLOUDS WILL
ACCOMPANY THE PASSAGE OF THE TROUGH THIS EVENING BEFORE CLEARING
OUT BEHIND THIS SYSTEM OVERNIGHT. AN ISOLATED SHOWER CANNOT BE
RULED OUT ACROSS THE WASHINGTON METROPOLITAN AREA INTO CENTRAL
VIRGINIA THIS EVENING...BUT MOST OF THE TIME WILL BE DRY SINCE
THERE IS LITTLE MOISTURE ASSOCIATED WITH THE TROUGH.

SURFACE HIGH PRESSURE WILL BEGIN TO BUILD OVERHEAD LATE TONIGHT.
LIGHT WINDS ALONG WITH CLEARING SKIES WILL CAUSE PATCHY FOG TO
DEVELOP IN SHELTERED VALLEYS AND RURAL AREAS...ESPECIALLY ACROSS
THE SHENANDOAH VALLEY INTO CENTRAL VIRGINIA. MIN TEMPS WILL RANGE
FROM THE 40S IN SOME OF THE COLDER VALLEYS TO THE LOWER AND MIDDLE
60S IN DOWNTOWN WASHINGTON AND BALTIMORE.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH 6 PM TUESDAY/...
HIGH PRES BUILDS ACROSS THE AREA TUESDAY FOR DRY CONDITIONS AND
PLENTY OF SUNSHINE. HIGH TEMPS IN THE L/M 80S.

&&

.LONG TERM /TUESDAY NIGHT THROUGH MONDAY/...
HIGH PRES OVR THE AREA WED WL PRODUCE M SUN SKIES W/ HIGHS IN THE
LM80S. AM STILL THINKING THAT W/ THE HIGH MOVG OFFSHORE ON THU
THAT ONSHORE FLOW WL LEAD TO A PD OF PROLONGED CLDNS FOR THE
LATTER STAGES OF THE WORKWEEK. THERE IS NO FORCING...AND WE'VE
CERTAINLY HAD PLENTY OF CAD SITUATIONS WHERE SKIES WERE CLDY BUT
PCPN FREE. FOR NOW WL GO W/ 20 POPS FOR R FRI/FRI NGT...BUT ON
WHOLE AREA SHOULD BE DRY. FORECAST TEMPERATURES CONTINUING IN THE
LM 80S FOR HIGHS...LOWS IN LM60S.

A COLD FRONT IS FORECAST APPROACH THE AREA SUNDAY. LOW CHC POPS W/ ISOLD
CNVCTN PSBL...BUT CERTAINLY THE HOLIDAY WKND DOES NOT LOOK LK A
WASHOUT. IT'S STILL A WEEK OUT..BUT FNT LOOKS TO PUSH E OF THE AREA
NEXT MON.

&&

.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
A BKN MID-LEVEL CLOUD DECK WILL DISSIPATE AS HIGH PRESSURE BUILDS
OVER THE TERMINALS LATE TONIGHT. WINDS WILL REMAIN LIGHT AND
VARIABLE. PATCHY BR MAY REDUCE VSBYS TO MVFR LEVELS ACROSS KCHO
AND KMRB LATE TONIGHT INTO EARLY TUESDAY MORNING.

HIGH PRESSURE WILL REMAIN OVER THE TERMINALS TUESDAY WITH VFR
CONDITIONS EXPECTED. LIGHT WINDS WILL SLOWLY VEER TOWARD THE
SOUTHEAST.

HIGH PRESSURE WILL BRING VFR CONDITIONS TUE. DRY CONDITIONS LOOKS
TO HOLD THROUGH WED NGT...ALTHOUGH AS HIGH PRESSURE MOVES OFF THE
COAST THU...AN EASTERLY FLOW MAY SET UP WHICH COULD EVENTUALLY
CAUSE SOME LOW CLOUDS FORM OVER THE AREA THU THRU SAT.

&&

.MARINE...
WINDS ARE EXPECTED TO REMAIN BELOW SCA CRITERIA THROUGH TUESDAY. A
PRESSURE SURGE LATE TONIGHT WILL CAUSE NORTH-NORTHEAST WINDS TO
GUST AROUND 15 KNOTS ACROSS THE CHESAPEAKE BAY AND LOWER TIDAL
POTOMAC RIVER.

HIGH PRESSURE BUILDS ACROSS THE AREA TUE THEN MOVES NORTHEAST AND
OFF THE COAST WEDNESDAY INTO THURSDAY. GRADIENT EXPECTED TO BE
GENERALLY WEAK AND NO SMALL CRAFT ADVISORY CONDITIONS ARE EXPECTED
THROUGH THE UPCOMING WEEK.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.
MARINE...NONE.

&&

PRODUCTS...LASORSA/WOODY!

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
718 PM EDT MON AUG 29 2011

ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
301000-
CHESAPEAKE BAY NORTH OF POOLES ISLAND MD-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD-
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD-
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
CHESTER RIVER TO QUEENSTOWN MD-EASTERN BAY-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
PATUXENT RIVER TO BROOMES ISLAND MD-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND-DISTRICT OF COLUMBIA-NORTHERN BALTIMORE-HARFORD-
SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS-
CALVERT-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-
718 PM EDT MON AUG 29 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MARYLAND PORTION OF THE
CHESAPEAKE BAY...TIDAL POTOMAC RIVER...AND ADJACENT COUNTIES IN
CENTRAL MARYLAND AND NORTHERN VIRGINIA AS WELL AS THE DISTRICT OF
COLUMBIA.

.DAY ONE...TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504-
WVZ050>053-055-501>506-301000-
WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD-
EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-AUGUSTA-
ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-NELSON-
ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-LOUDOUN-ORANGE-CULPEPER-
NORTHERN FAUQUIER-SOUTHERN FAUQUIER-WESTERN HIGHLAND-
EASTERN HIGHLAND-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-HARDY-
WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL-
WESTERN PENDLETON-EASTERN PENDLETON-
718 PM EDT MON AUG 29 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN WEST VIRGINIA...
NORTHERN AND CENTRAL VIRGINIA...AND CENTRAL AND WESTERN MARYLAND
WITH THE EXCEPTION OF GARRETT COUNTY.

.DAY ONE...TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.