Flash Flood Warning 4, NWS Baltimore/Washington

206 
WGUS71 KLWX 110014
FFSLWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
714 PM EST THU MAR 10 2011

DCC001-MDC017-031-033-VAC013-059-061-099-107-153-179-510-600-610-683-
685-110245-
/O.CON.KLWX.FF.W.0004.000000T0000Z-110311T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DISTRICT OF COLUMBIA DC-MONTGOMERY MD-PRINCE GEORGES MD-
KING GEORGE VA-STAFFORD VA-CITY OF MANASSAS VA-
CITY OF MANASSAS PARK VA-CITY OF ALEXANDRIA VA-CITY OF FAIRFAX VA-
CITY OF FALLS CHURCH VA-ARLINGTON VA-FAUQUIER VA-LOUDOUN VA-
PRINCE WILLIAM VA-FAIRFAX VA-CHARLES MD-
714 PM EST THU MAR 10 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM EST FOR
DISTRICT OF COLUMBIA...AND CHARLES...FAIRFAX...PRINCE WILLIAM...
LOUDOUN...NORTHERN FAUQUIER...ARLINGTON...CITY OF FALLS CHURCH...CITY
OF FAIRFAX...CITY OF ALEXANDRIA...CITY OF MANASSAS PARK...CITY OF
MANASSAS...NORTHEASTERN STAFFORD...NORTHEASTERN KING GEORGE...PRINCE
GEORGES AND MONTGOMERY COUNTIES...

AT 708 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE HEAVY RAIN CAPABLE OF PRODUCING FLASH FLOODING OVER THE 
WARNED AREA. RAINFALL AMOUNTS OF OVER ONE INCH ARE EXPECTED...IN 
ADDITION TO THE HEAVY RAIN THAT HAS ALREADY FALLEN TODAY.

LOCATIONS IN THE WARNING INCLUDE THE ENTIRE WASHINGTON METROPOLITAN 
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EST
THURSDAY EVENING FOR CENTRAL DISTRICT OF COLUMBIA AND SOUTHERN
MARYLAND AND NORTHWESTERN VIRGINIA.

&&

LAT...LON 3866 7671 3833 7693 3832 7703 3828 7699
      3823 7705 3834 7722 3837 7714 3839 7726
      3856 7725 3841 7730 3876 7781 3868 7790
      3871 7800 3886 7814 3888 7807 3926 7770
      3913 7687 3891 7667

$$

JE/SBK

892 
WGUS71 KLWX 110239
FFSLWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
939 PM EST THU MAR 10 2011

DCC001-MDC017-031-033-VAC013-059-061-099-107-153-179-510-600-610-683-
685-110246-
/O.EXP.KLWX.FF.W.0004.000000T0000Z-110311T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DISTRICT OF COLUMBIA DC-MONTGOMERY MD-PRINCE GEORGES MD-
KING GEORGE VA-STAFFORD VA-CITY OF MANASSAS VA-
CITY OF MANASSAS PARK VA-CITY OF ALEXANDRIA VA-CITY OF FAIRFAX VA-
CITY OF FALLS CHURCH VA-ARLINGTON VA-FAUQUIER VA-LOUDOUN VA-
PRINCE WILLIAM VA-FAIRFAX VA-CHARLES MD-
939 PM EST THU MAR 10 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 945 PM EST FOR DISTRICT OF
COLUMBIA...AND CHARLES...FAIRFAX...PRINCE WILLIAM...LOUDOUN...
NORTHERN FAUQUIER...ARLINGTON...CITY OF FALLS CHURCH...CITY OF
FAIRFAX...CITY OF ALEXANDRIA...CITY OF MANASSAS PARK...CITY OF
MANASSAS...NORTHEASTERN STAFFORD...NORTHEASTERN KING GEORGE...PRINCE
GEORGES AND MONTGOMERY COUNTIES...

HEAVIER RAINFALL HAS ENDED ACROSS THE WASHINGTON METROPOLITAN AREA 
THIS EVENING. HOWEVER...LIGHT RAIN WILL CONTINUE TO FALL THROUGH 11 
PM. ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO TENTHS OF AN INCH WILL 
BE LIKELY. 

EVEN AFTER ALL RAINFALL HAS ENDED...ROADWAYS MAY REMAIN FLOODED 
THROUGH THE EARLY MORNING HOURS. 


LAT...LON 3866 7671 3833 7693 3832 7703 3828 7699
      3823 7705 3834 7722 3837 7714 3839 7726
      3856 7725 3841 7730 3876 7781 3868 7790
      3871 7800 3886 7814 3888 7807 3926 7770
      3913 7687 3891 7667

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
344 PM EST THU MAR 10 2011

.SYNOPSIS...
A POTENT UPPER LOW AND COLD FRONT WILL SLOWLY MOVE THROUGH THE AREA
TONIGHT. THE COLD FRONT PUSHES OFF THE COAST EARLY FRIDAY WHILE
THE UPPER LOW GRADUALLY MOVES ACROSS THE NORTHEAST STATES UNTIL
THE BEGINNING OF THE WEEKEND. A WEAK UPPER TROUGH TRACKS NORTH OF
THE AREA SATURDAY...FOLLOWED BY A RETURN OF HIGH PRESSURE SUNDAY
AND MONDAY.

&&

.NEAR TERM /THROUGH FRIDAY/...
MULTIPLE WEATHER HAZARDS WILL AFFECT THE CWA IN ASSOCIATION WITH A
STORM SYSTEM APPROACHING FROM THE WEST. HAZARDS INCLUDE FLOODS AND
FLASH FLOODS...SEVERE WEATHER...COASTAL FLOODING...GALES ON THE
WATERS AND THEN TONIGHT SNOW ACROSS THE WEST. COASTAL FLOODING AND
GALES ON THE WATERS ARE DETAILED BELOW IN THE TIDES/COASTAL FLOODING
AND MARINE SECTIONS RESPECTIVELY. FLOODS AND FLASH FLOODS ARE ALSO
DISCUSSED IN THE HYDROLOGY SECTION BELOW.

OCCLUDED STORM SYSTEM/FRONT TO THE WEST THIS AFTERNOON WILL PROGRESS
TO THE EAST AND MOVE ACROSS THE CWA LATER THIS EVENING/TONIGHT. WITH
DECENT LIFT AND HIGH PRECIPITABLE WATERS...EXPECT WIDESPREAD
SHOWERS WITH THE POTENTIAL FOR EMBEDDED THUNDER AHEAD OF THIS
SYSTEM. WITH HIGH PRECIPITABLE WATERS AND ALREADY SATURATED
GROUND...THE RISK FOR FLOODING WILL PERSIST INTO THE EVENING.
FLOOD WATCH IS IN EFFECT FOR THE ENTIRE CWA UNTIL MIDNIGHT. WHILE
SURFACE INSTABILITY IS WEAK...SLIGHT COOLING ALOFT HAS HELPED TO
STEEPEN LAPSE RATES AND WIND FIELDS/SHEAR PROFILES ARE DECENT...SO
THERE IS A RISK FOR SEVERE WEATHER ESPECIALLY ACROSS THE SOUTHERN
HALF OF THE CWA WHERE ANY STORMS CAN TRANSPORT STRONG AND POSSIBLY
DAMAGING WINDS TO THE SURFACE ALONG WITH THE POSSIBILITY OF AN
ISOLATED TORNADO.

SHOWERS WILL END FROM SOUTHWEST TO NORTHEAST THROUGH THE
EVENING...SO CATEGORICAL POPS REDUCE WITH TIME IN THIS WAY. COLDER
AIR MOVES IN LATER THIS EVENING ACROSS THE HIGHLANDS...AND THIS WILL
CHANGE RAIN OVER TO SNOW. SYNOPTIC LIFT WILL SHIFT TO UPSLOPE
ENHANCED LIFT OVERNIGHT/FRIDAY. SNOW MAY BECOME MODERATE LATER ON
TONIGHT...AND CONTINUE INTO FRIDAY. WILL ISSUE A WINTER WEATHER
ADVISORY FOR 3 TO 5 INCHES OF SNOW FOR THE UPSLOPE COUNTIES.

MEANWHILE EAST OF THE MTNS...ATMOSPHERE SHOULD DRY OUT LATER TONIGHT
INTO FRIDAY. CLOUDS MAY HANG ON FOR A WHILE OVERNIGHT INTO EARLY
FRIDAY...BUT SOME BREAKS IN THE CLOUDS AND PEEKS OF SUNSHINE ARE
EXPECTED ON FRIDAY AS THE UPPER TROUGH SLOWLY ROTATES NORTHEAST FROM
THE CWA.

&&

.SHORT TERM /FRIDAY NIGHT/...
THE CLOSED UPPER LOW WILL START TO PULL AWAY FROM THE REGION FRI NGT
AS A KICKER SHORTWAVE TROUGH DIVES APPROACHES THE GREAT LAKES
REGION. LINGERING WRAP-AROUND MOISTURE WILL HANG AROUND FOR UPSLOPE
SNOW TO CONTINUE INTO THE EVE BEFORE MOISTURE EXITS AND INVERSION
HEIGHTS CRASH OVERNIGHT. ADDITIONAL SNOWFALL AMOUNTS FRI EVE WILL BE
AN INCH OR LESS ALONG THE WRN SLOPES OF THE ALLEGHENY FRONT.
ELSEWHERE...SKIES WILL CONTINUE TO CLEAR AS THE UPPER LOW EXITS. LOW
TEMPS WILL RANGE FROM THE 20S ACROSS HIGHLANDS TO THE MID 30S IN THE
CITIES AND ALONG THE COAST. THE WRN SUBURBS OF DC-BALTIMORE WILL
APPROACH THE FREEZING MARK. A LIGHT BREEZE WILL PREVENT TEMPS FROM
DROPPING MUCH MORE.

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...
AN UPPER SHORTWAVE TROUGH WILL MOVE ACROSS THE NORTHEAST STATES SAT.
ZONAL FLOW ALOFT SHOULD ALLOW THE LOW AND ACCOMPANIED LIFT TO REMAIN
NORTH OF THE CWA. WILL KEEP LOW CHANCE POPS IN THE FCST FOR THE WRN
SLOPES OF THE ALLEGHENY FRONT AS UPSLOPE FLOW MAY BE ENOUGH FOR A
FEW RAIN SHOWERS TO DEVELOP DURING THE DAY AND RAIN/SNOW SHOWERS SAT
NGT. SFC SLY FLOW AHEAD OF THE LOW WILL ADVECT WARMER AIR INTO THE
REGION ON SAT. TEMPS ACROSS NRN MD WILL BE THE COOL SPOT IN
THE CWA DUE TO CLOUD COVER...WHERE HIGHS WILL BE IN THE MID 50S.
AFTN TEMPS MAY WARM INTO THE MID 60S ACROSS CENTRAL VA WITH MORE SUN.

BEHIND THE DEPARTING LOW...HIPRES BUILDS IN FROM THE NORTH SUN AND
MON. DRY CONDITIONS AND NEAR NORMAL TEMPS ARE EXPECTED DURING THIS
TIME. A WEAK SHORTWAVE TROUGH WILL PROVIDE CLOUDS AND CHANCES FOR
PRECIP LATE MON INTO ERY TUE. WEAK DYNAMICS AND PROGRESSIVE TRACK
WOULD KEEP ANY PRECIP AMOUNTS LIGHT.

&&

.AVIATION /21Z THURSDAY THROUGH TUESDAY/...
SHOWERS WITH IFR VSBYS AND IFR/MVFR CIGS WILL MOVE ACROSS THE
TERMINALS OVER THE NEXT SEVERAL HOURS...INCLUDING THE AFTERNOON PUSH
AND POSSIBLY ALSO PERSISTING INTO THE EVENING BANK. ALSO HAVE THE
POTENTIAL FOR ISOLATED THUNDERSTORMS FROM CHO UP THROUGH THE DCA-BWI
HUBS WHICH COULD TRANSPORT LOCALLY GUSTY WIND AOA 40 KT TO THE
SURFACE. IF THIS OCCURRED...THE WINDOW LOOKS TO BE FROM 21-22Z AT
CHO AND 22Z-01Z AT THE DCA-BWI HUBS. FRONT MOVES ACROSS THE REGION
LATER THIS EVENING WITH A WIND SHIFT TO THE WEST. LAMP LINGERS
IFR CIGS AFTER THE WIND SHIFT ALL THE WAY TO 13-14Z. THERE MAY BE
SOME LOW LEVEL MOISTURE LINGERING BUT FAVOR MET MOS IN IMPROVING
CIGS SHORTLY AFTER THE WIND SHIFT. SHORT RANGE ENSEMBLES FAVOR
THIS SOLUTION TOO. EVENING SHIFT WILL OBVIOULSY HAVE TO FURTHER
INSPECT. EITHER WAY...VFR SHOULD RETURN FOR FRIDAY.

VFR CIGS/VSBYS FRI NGT THRU ERY NEXT WEEK. A STRENGTHENING PRESSURE
GRADIENT BETWEEN LOPRES MOVING ACROSS SOUTHEAST CANADA AND HIPRES
OVER THE SOUTHEAST WILL RESULT IN STRONGER WIND GUSTS AROUND 25 KT
ON SAT.

&&

.MARINE...
SOUTHEAST FLOW HAS BEEN EFFICIENTLY TRANSPORTING AROUND 30 KT
GUSTS UP THE BAY/LOWER POTOMAC THIS AFTERNOON. SHOWERS OVERHEAD
COULD TRANSPORT LOCALLY HIGHER GUSTS DOWN. GALES ARE IN EFFECT
THROUGH THIS EVENING FOR THESE AREAS...WITH A SMALL CRAFT ADVISORY
IN EFFECT FOR THE REMAINDER OF THE WATERS. THE GALE AREAS RAMP
DOWN TO A SMALL CRAFT ADVISORY LATER THIS EVENING. AS A FRONT
MOVES THROUGH...WEST WINDS ARE NOT FORECAST TO BE AS GUSTY
OVERNIGHT INTO EARLY FRIDAY BUT ENOUGH FOR A LOW END SCA.

WINDS SHOULD REMAIN BELOW SCA LVLS FRI NGT. WILL NEED TO WATCH THE
POTENTIAL FOR A SCA ACROSS THE SRN MD CHSPK BAY THOUGH AS 20 KT
WINDS WILL EXIST NOT TOO FAR OFF THE SFC. WITH A TIGHT PRESSURE
GRADIENT BETWEEN LOPRES TRACKING TO THE NORTH AND HIPRES OVER THE
SOUTHEAST...SCA WINDS LIKELY FOR MOST OF THE WATERS THIS WEEKEND.

&&

.HYDROLOGY...
AREAL AND SMALL STREAM FLOODING CONCERNS WILL CONTINUE ACROSS THE
ENTIRE CWA THROUGH THIS EVE. HEAVY RAIN AHEAD OF A SLOW-MOVING COLD
FRONT WILL IMPACT THE AREA FOR THE REST OF THE AFTN INTO THE EVE.
ADDITIONAL PRECIP AMOUNTS DURING THIS TIME WILL RANGE FROM 0.5 TO
1.5 INCHES WITH THE HIGHEST AMOUNTS ACROSS NORTHEAST MD. HIGHER
TOTALS MAY OCCUR IN CONVECTIVE STORMS.

ONCE THE FRONT CLEARS THE AREA AROUND MIDNIGHT...FOCUS WILL TURN TO
THE LARGER CREEKS AND MAIN-STEM RIVER FLOODING ACROSS THE POTOMAC
AND RAPPAHANOCK. THE UPPER POTOMAC AND ITS TRIBUTARIES WILL LIKELY
REACH FLOOD STAGE BY FRI MRNG WHILE FARTHER DOWNSTREAM LOCATIONS
/FROM POINT OF ROCKS DOWNSTREAM/ WILL CREST ABOVE FLOOD STAGE FROM
FRI AFTN INTO SAT. MODERATE RIVER FLOODING ARE FORECASTED FOR THE
CONOCOHEAGUE CREEK...MONOCACY RIVER AND POINT OF ROCKS.

&&

.TIDES/COASTAL FLOODING...
NEXT HIGH TIDE IS EXPECTED TO EXPERIENCE MODERATE TIDAL FLOODING
DURING THE HIGH TIDE CYCLE THIS AFTERNOON/EVENING. COASTAL FLOOD
WARNING IS IN EFFECT. BEYOND THAT...COASTAL FLOOD ADVISORIES MAY BE
NECESSARY TO COVER MINOR FLOODING.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...FLOOD WATCH UNTIL MIDNIGHT EST TONIGHT FOR DCZ001.
     COASTAL FLOOD WARNING UNTIL 3 AM EST FRIDAY FOR DCZ001.
MD...FLOOD WATCH UNTIL MIDNIGHT EST TONIGHT FOR MDZ003>007-009>011-
     013-014-016>018-501-502.
     WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 6 PM EST
     FRIDAY FOR MDZ501.
     COASTAL FLOOD WARNING UNTIL 3 AM EST FRIDAY FOR MDZ007-011-013-
     014-016>018.
VA...FLOOD WATCH UNTIL MIDNIGHT EST TONIGHT FOR VAZ025>031-036>040-
     042-050>057-501>504.
     WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 6 PM EST
     FRIDAY FOR VAZ503.
     COASTAL FLOOD WARNING UNTIL 3 AM EST FRIDAY FOR VAZ052>055-057.
WV...FLOOD WATCH UNTIL MIDNIGHT EST TONIGHT FOR WVZ050>053-055-
     501>506.
     WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 6 PM EST
     FRIDAY FOR WVZ501-503-505.
MARINE...SMALL CRAFT ADVISORY FROM 9 PM THIS EVENING TO 1 PM EST FRIDAY
     FOR ANZ531>534-537>543.
     GALE WARNING UNTIL 9 PM EST THIS EVENING FOR ANZ531>534-
     537>543.
     SMALL CRAFT ADVISORY UNTIL 1 PM EST FRIDAY FOR ANZ530.
     SMALL CRAFT ADVISORY UNTIL MIDNIGHT EST TONIGHT FOR ANZ535-536.

&&

SYNOPSIS...BPP/JRK
NEAR TERM...BPP
SHORT TERM...JRK
LONG TERM...JRK
AVIATION...JRK/BPP
MARINE...JRK/BPP
HYDROLOGY...JRK
TIDES/COASTAL FLOODING...BPP

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
540 PM EST THU MAR 10 2011

ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
111000-
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-
540 PM EST THU MAR 10 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

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 8 PM FOR
SPOTSYLVANIA...STAFFORD AND KING GEORGE COUNTIES. IF THUNDERSTORMS
HOLD TOGETHER...THIS MAY EVENTUALLY NEED TO BE EXPANDED INTO
SOUTHERN MARYLAND. SCATTERED THUNDERSTORMS THIS AFTERNOON AND
EARLY EVENING WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS.
THERE IS ALSO THE POSSIBILITY OF AN ISOLATED TORNADO.

A COASTAL FLOOD WARNING REMAINS IN EFFECT FOR AREAS ALONG THE
TIDAL POTOMAC RIVER AND WESTERN SIDE OF THE CHESAPEAKE BAY THROUGH
TONIGHT. PLEASE REFER TO THE LATEST HAZARD MESSAGE /WBCCFWLWX/ FOR
FURTHER DETAILS.

A FLOOD WATCH REMAINS IN EFFECT FOR THE OUTLOOK AREA THROUGH
MIDNIGHT. PLEASE REFER TO THE LATEST HAZARD MESSAGE /WBCFFALWX/
FOR FURTHER DETAILS.

A GALE WARNING IS IN EFFECT FOR THE LOWER TIDAL POTOMAC RIVER AND
THE MARYLAND CHESAPEAKE BAY THROUGH THIS EVENING. OTHERWISE...A
SMALL CRAFT ADVISORY IS IN EFFECT FOR THE WATERS THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A SMALL CRAFT ADVISORY REMAINS IN EFFECT FOR THE MARYLAND
CHESAPEAKE BAY AND LOWER TIDAL POTOMAC RIVER THROUGH FRIDAY
MIDDAY.

A COASTAL FLOOD ADVISORY COULD BE NECESSARY ON FRIDAY FOR AREAS
ADJACENT TO THE TIDAL POTOMAC RIVER AND CHESAPEAKE BAY.

SMALL CRAFT ADVISORY CONDITIONS ARE POSSIBLE THIS WEEKEND FOR
PORTIONS OF THE TIDAL POTOMAC AND MARYLAND CHESAPEAKE BAY.

.SPOTTER INFORMATION STATEMENT...

THE SPOTTER NETWORK HAS BE ACTIVATED. FLOODING...SEVERE WEATHER
AND RAINFALL REPORTS ARE APPRECIATED.

MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504-
WVZ050>053-055-501>506-111000-
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-
540 PM EST THU MAR 10 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

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 8 PM ACROSS
PORTIONS OF THE NORTH CENTRAL VIRGINIA FOOTHILLS AND PIEDMONT.
SCATTERED THUNDERSTORMS THIS AFTERNOON AND EARLY EVENING WILL BE
CAPABLE OF PRODUCING DAMAGING WIND GUSTS. THERE IS ALSO THE
POSSIBILITY OF AN ISOLATED TORNADO.

A FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING FOR THE OUTLOOK
AREA. PLEASE REFER TO THE LATEST HAZARD MESSAGE /WBCFFALWX/ FOR
FURTHER DETAILS.

A WINTER WEATHER ADVISORY IS IN EFFECT OVERNIGHT FOR THE WESTERN
SLOPES OF THE ALLEGHENY FRONT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

MINOR TO MODERATE RIVER FLOODING IS EXPECTED ACROSS MANY
LOCATIONS ALONG THE POTOMAC AND RAPPAHANNOCK RIVERS FROM LATE
TONIGHT THROUGH SATURDAY.

THE WINTER WEATHER ADVISORY REMAINS IN EFFECT THROUGH FRIDAY
AFTERNOON FOR THE WESTERN SLOPES OF THE ALLEGHENY FRONT.

.SPOTTER INFORMATION STATEMENT...

THE SPOTTER NETWORK HAS BE ACTIVATED. FLOODING...SEVERE WEATHER
AND RAINFALL REPORTS ARE APPRECIATED.

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
419 PM EST THU MAR 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0245 PM     FLOOD            1 WSW FOREST HILL       39.58N  76.40W
03/10/2011                   HARFORD            MD   911 CALL CENTER

            FLOODING ON EAST JARRETTSVILLE ROAD FROM RT 1 TO RT 24
            IN THE FOREST HILL AREA.

&&

CORRECTED LOCATION

EVENT NUMBER LWX1100128

KLW

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
428 PM EST THU MAR 10 2011

VAZ037-050-051-055-056-502-102200-
ORANGE VA-STAFFORD VA-CULPEPER VA-SOUTHERN FAUQUIER VA-ALBEMARLE VA-
SPOTSYLVANIA VA-
428 PM EST THU MAR 10 2011

...A LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN TO AFFECT ORANGE...
STAFFORD...CULPEPER...SOUTHERN FAUQUIER...ALBEMARLE AND SPOTSYLVANIA
COUNTIES...

AT 428 PM EST...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 15 MILES SOUTH OF SCOTTSVILLE TO 43 MILES SOUTH
OF SCOTTSVILLE...MOVING NORTHEAST AT 45 MPH.

THESE STORMS WILL PRODUCE VERY HEAVY RAINFALL AS THEY MOVE INTO THE
REGION AROUND 530 PM EST. RESIDENTS SHOULD BE ALERT FOR FLASH FLOOD
WARNINGS WHICH MAY BE ISSUED SHORTLY.

THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

HEAVY RAIN WITH THIS STORM MAY REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 3827 7817 3830 7811 3835 7811 3853 7799
      3840 7730 3839 7729 3811 7750 3799 7764
      3802 7775 3804 7775 3810 7784 3814 7808
      3812 7821 3775 7852 3776 7852
TIME...MOT...LOC 2128Z 210DEG 40KT 3763 7851 3724 7828

JE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
434 PM EST THU MAR 10 2011

VAZ026-029-030-037>040-050-051-102200-
ORANGE VA-GREENE VA-MADISON VA-CULPEPER VA-PAGE VA-RAPPAHANNOCK VA-
WARREN VA-ALBEMARLE VA-ROCKINGHAM VA-
434 PM EST THU MAR 10 2011

...AN AREA OF SHOWERS AND ISOLATED THUNDERSTORMS TO AFFECT
ORANGE...GREENE...MADISON...CULPEPER...PAGE...RAPPAHANNOCK...
WARREN...ALBEMARLE AND ROCKINGHAM COUNTIES...

AT 432 PM EST...DOPPLER RADAR INDICATED AN AREA OF GUSTY SHOWERS AND
ISOLATED THUNDERSTORMS ALONG A LINE EXTENDING FROM 3 MILES SOUTHWEST
OF PINE GROVE TO 6 MILES SOUTH OF WOODRIDGE...MOVING NORTHEAST AT 30
MPH.

LOCATIONS IMPACTED INCLUDE STANLEY...BIG MEADOWS...LURAY...MADISON...
SPERRYVILLE AND ORANGE.

WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS
STORM.

THIS LINE OF STORMS WILL ALSO HAVE THE POTENTIAL TO PRODUCE LOCALLY
HEAVY RAINFALL.

&&

LAT...LON 3780 7849 3860 7862 3892 7815 3816 7791
      3812 7796 3814 7808 3812 7821
TIME...MOT...LOC 2132Z 229DEG 25KT 3853 7850 3782 7839

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
456 PM EST THU MAR 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0245 PM     FLOOD            1 WSW FOREST HILL       39.58N  76.40W
03/10/2011                   HARFORD            MD   911 CALL CENTER

            FLOODING ON EAST JARRETTSVILLE ROAD FROM RT 1 TO RT 24
            IN THE FOREST HILL AREA.

0315 PM     FLASH FLOOD      2 E TYE RIVER           37.65N  78.92W
03/10/2011                   NELSON             VA   911 CALL CENTER

            SOUTH POWELLS ISLAND ROAD REPORTED CLOSED DUE TO HIGH
            WATER

0400 PM     FLOOD            2 S MERRIFIELD          38.85N  77.25W
03/10/2011                   FAIRFAX            VA   CO-OP OBSERVER

            PROSPERITY ROAD BETWEEN HWY 50 AND LITTLE RIVER TNPK
            CLOSED DUE TO FLOODING

&&

EVENT NUMBER LWX1100128 LWX1100130 LWX1100129

LEE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
457 PM EST THU MAR 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0356 PM     FLOOD            1 W ESSEX               39.30N  76.47W
03/10/2011                   BALTIMORE          MD   TRAINED SPOTTER

            NEIGHBORHOODS BEING EVACUATED IN JONES FALLS AND MOUNT
            WASHINGTON AREAS.

&&

EVENT NUMBER LWX1100131

SBK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
524 PM EST THU MAR 10 2011

VAZ027-028-030-031-042-501-WVZ050-052-053-102300-
NORTHERN FAUQUIER VA-WARREN VA-SHENANDOAH VA-CLARKE VA-LOUDOUN VA-
JEFFERSON WV-HAMPSHIRE WV-BERKELEY WV-FREDERICK VA-
524 PM EST THU MAR 10 2011

...STRONG THUNDERSTORMS TO AFFECT NORTHERN FAUQUIER...WARREN...
SHENANDOAH...CLARKE...LOUDOUN...JEFFERSON...HAMPSHIRE...BERKELEY AND
FREDERICK COUNTIES...

AT 525 PM EST...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM CROSS JUNCTION TO 3 MILES SOUTH OF BUCKTON...
MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE STEPHENS CITY...MILLWOOD PIKE...
GREENWOOD...GREENWOOD AND BERRYVILLE.

STORM INTENSITY IS INCREASING...AND SEVERE WEATHER MAY DEVELOP
RAPIDLY. REMAIN ALERT...AND BE PREPARED TO TAKE ACTION IF WARNINGS
ARE ISSUED.

WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS
STORM.

WIND GUSTS OF 40 TO 50 MPH CAN BE EXPECTED WITH THIS STORM.

&&

LAT...LON 3935 7776 3896 7771 3901 7815 3883 7834
      3933 7836
TIME...MOT...LOC 2225Z 221DEG 24KT 3932 7827 3894 7823

LISTEMAA/SMZ