Category Archives: D.C.

Tornado Warning Washington, D.C. Montgomery MD Prince Georges MD

BULLETIN – EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
317 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* TORNADO WARNING FOR…
THE DISTRICT OF COLUMBIA…
SOUTHEASTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND…
NORTHERN PRINCE GEORGES COUNTY IN CENTRAL MARYLAND…

* UNTIL 345 PM EDT

* AT 316 PM EDT…A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS NEAR TAKOMA PARK…OR NEAR FORT TOTTEN…AND WAS MOVING
NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE…
CHILLUM…
BELTSVILLE…
FAIRLAND…

PRECAUTIONARY/PREPAREDNESS ACTIONS…

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR
VEHICLE…MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

THIS TORNADO MAY BE WRAPPED IN RAIN AND HARD TO SEE. TAKE COVER NOW.

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Upgrade to Moderate Risk…

MESOSCALE DISCUSSION 1960
NWS STORM PREDICTION CENTER NORMAN OK
1019 AM CDT TUE SEP 18 2012

AREAS AFFECTED…FAR NRN SC…CNTRL/ERN NC…CNTRL/ERN VA…DISTRICT
OF COLUMBIA…CNTRL/ERN MD…MUCH OF DE…ERN PA…WRN/NRN
NJ…PARTS OF ERN NY

CONCERNING…OUTLOOK UPGRADE

VALID 181519Z – 181645Z

SUMMARY…A CATEGORICAL UPGRADE TO MODERATE RISK IS PLANNED FOR THE
UPCOMING 1630 UTC DAY-1 CONVECTIVE OUTLOOK FROM PARTS OF THE
CAROLINAS NWD INTO PARTS OF ERN NY.

DISCUSSION…STRONG LOW-LEVEL AND DEEP SHEAR IN ASSOCIATION WITH A
CONUS-FULL-LATITUDE TROUGH WILL SUPPORT MULTIPLE QLCS SEGMENTS
ACROSS A BROAD WARM SECTOR OVER THE ERN CONUS. WIDESPREAD SVR WIND
GUSTS WILL BE THE MAIN CONCERN ACROSS THE UPCOMING MODERATE RISK
AREA…AND SVR WIND PROBABILITIES WILL BE INCREASED TO 45 PERCENT
ACROSS THIS REGION. HOWEVER…TORNADOES WILL ALSO BE
POSSIBLE…PARTICULARLY WITH EMBEDDED LEWP STRUCTURES…LINE
BREAKS…AND DISCRETE CONVECTION EVOLVING AHEAD AN APPROACHING
EXTENSIVE COLD FRONT. PLEASE SEE THE FORTHCOMING OUTLOOK FOR
ADDITIONAL METEOROLOGICAL INFORMATION.

..COHEN/CARBIN/MEAD.. 09/18/2012

Tornado Watch (D.C., Maryland, North Carolina, Virginia, West Virginia, Coastal Waters)

URGENT – IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 642
NWS STORM PREDICTION CENTER NORMAN OK
1055 AM EDT TUE SEP 18 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

DISTRICT OF COLUMBIA
MARYLAND
NORTHERN NORTH CAROLINA
CENTRAL AND EASTERN VIRGINIA
EASTERN WEST VIRGINIA PANHANDLE
COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1055 AM UNTIL 700
PM EDT.

TORNADOES…HAIL TO 0.5 INCH IN DIAMETER…THUNDERSTORM WIND
GUSTS TO 70 MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF
SOUTH HILL VIRGINIA TO 40 MILES NORTH NORTHEAST OF BALTIMORE
MARYLAND. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

REMEMBER…A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION…CONTINUE…WW 641…

DISCUSSION…A GRADUAL INCREASE IN STORM COVERAGE AND INTENSITY IS
EXPECTED TODAY AS LARGE-SCALE FORCING FOR ASCENT INCREASES ACROSS A
VERY MOIST AND MARGINALLY UNSTABLE WARM SECTOR. CURRENT VAD AND
MODEL FORECAST DATA INDICATE A CONTINUED STRENGTHENING OF THE
DEEP-LAYER WIND FIELD THROUGH THE PEAK OF THE DIURNAL HEATING CYCLE
WITH THE ENVIRONMENT BECOMING SUPPORTIVE OF EMBEDDED BOW/LEWP AND
SUPERCELL STRUCTURES CAPABLE OF TORNADOES AND DAMAGING WINDS.

Severe Weather Likely Tomorrow on the East Coast…

Part of the text from the Storm Predicton Center Day 2 outlook at 1:31 PM EDT today…

…MID ATLANTIC THROUGH PORTIONS OF THE NERN STATES…

IN WAKE OF NWD ADVANCING WARM FRONT…RICH GULF MOISTURE WITH UPPER
60S TO NEAR 70F DEWPOINTS WILL ADVECT THROUGH WARM SECTOR ALONG
STRENGTHENING 50+ KT LLJ. WIDESPREAD CLOUDS WITH AREAS OF RAIN AND
THUNDERSTORMS WILL LIKELY BE ONGOING ALONG WARM CONVEYOR BELT AND
WITHIN PLUME OF DEEPER SUBTROPICAL MOISTURE…ESPECIALLY IN WRN
PORTION OF WARM SECTOR. SOME OF THIS ACTIVITY COULD POSE A THREAT OF
MAINLY ISOLATED DAMAGING WIND FROM THE WRN CAROLINAS INTO WRN VA.
CLOUDS AND AREAS OF RAIN WILL CONTRIBUTE TO WEAK MID LEVEL LAPSE
RATES AND INSTABILITY…POSSIBLY SERVING AS A LIMITING FACTOR. THE
MOST FAVORABLE SHEAR/INSTABILITY PARAMETER SPACE FOR SEVERE STORMS
IS EXPECTED EVOLVE OVER THE MID ATLANTIC REGION ALONG STRENGTHENING
LLJ AND WHERE A FEW CLOUD BREAKS WILL PROMOTE AT LEAST MODEST
BOUNDARY LAYER DESTABILIZATION WITH 500-1000 J/KG MLCAPE POSSIBLE.

STORMS ARE EXPECTED TO INTENSIFY AS THEY DEVELOP EWD THROUGH THE
DESTABILIZING WARM SECTOR. MIXED CONVECTIVE MODES ARE LIKELY
INCLUDING LINES WITH EMBEDDED SUPERCELLS/BOWING SEGMENTS. A FEW
DISCRETE SUPERCELLS MAY ALSO OCCUR IF SUFFICIENT BOUNDARY LAYER
WARMING OCCURS. DAMAGING WIND AND A FEW TORNADOES WILL BE THE
PRIMARY THREATS. THIS REGION WILL CONTINUE TO BE MONITORED FOR A
POSSIBLE MODERATE RISK IF IT BEGINS TO APPEAR THAT MORE INSTABILITY
WILL DEVELOP THAN CURRENTLY ANTICIPATED.

Stay with Weather or Knot for the latest severe weather information.

Confirmed Tornado near Fairfax, VA and Washington, DC 3:43pm edt

BULLETIN – EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
344 PM EDT SAT SEP 8 2012

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* TORNADO WARNING FOR…
CITY OF FALLS CHURCH IN NORTHERN VIRGINIA…
SOUTHERN ARLINGTON COUNTY IN NORTHERN VIRGINIA…
CITY OF ALEXANDRIA IN NORTHERN VIRGINIA…
EASTERN FAIRFAX COUNTY IN NORTHERN VIRGINIA…

* UNTIL 415 PM EDT

* AT 343 PM EDT…A CONFIRMED TORNADO WAS REPORTED NEAR FAIRFAX…
AND WAS MOVING EAST AT 50 MPH. THIS TORNADO HAS BEEN CONFIRMED BY
COUNTY OFFICIALS.

* LOCATIONS IMPACTED INCLUDE…
ALEXANDRIA…
HUNTINGTON…
CRYSTAL CITY…
BALLSTON…
THE WOODROW WILSON BRIDGE…
REAGAN NATIONAL AIRPORT…

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