Alert archive / Maryland / Tornado Warnings in 2011

Tornado Warning 55, NWS Baltimore/Washington

April 28, 2011Baltimore County, Harford County, Maryland

NWS Baltimore/Washington issued this tornado warning at Apr 28, 2011, 8:14 AM EDT for Baltimore County, Harford County, Maryland. It was in force for 11 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 28, 2011, 8:14 AM EDT (12:14 UTC)
Expired: Apr 28, 2011, 8:25 AM EDT
In force: 11 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Baltimore County, MD, Harford County, MD

The radar

The Sterling radar (KLWX), 98 km from the middle of the area, began a volume at 12:14 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 28, 7:38 AM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 0.2 hours before the alert went out and 59 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 482 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 670 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 371 m²/s²
0-3 km storm-relative helicity: 401 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

662 
WFUS51 KLWX 281214
TORLWX
MDC005-025-281245-
/O.NEW.KLWX.TO.W.0055.110428T1214Z-110428T1245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
814 AM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* TORNADO WARNING FOR...
  BALTIMORE COUNTY IN NORTHERN MARYLAND...
  HARFORD COUNTY IN NORTHERN MARYLAND...

* UNTIL 845 AM EDT

* AT 809 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER
  NORTHWESTERN BALTIMORE COUNTY...OR 10 MILES EAST OF WESTMINSTER...
  MOVING NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FREELAND...
  MARYLAND LINE...
  NORRISVILLE...

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.

&&

LAT...LON 3958 7681 3960 7684 3965 7682 3973 7673
      3972 7647
TIME...MOT...LOC 1214Z 229DEG 44KT 3965 7677

$$


BJL

1 follow-up statement

101 
WWUS51 KLWX 281225
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
825 AM EDT THU APR 28 2011

MDC005-025-281235-
/O.CAN.KLWX.TO.W.0055.000000T0000Z-110428T1245Z/
BALTIMORE MD-HARFORD MD-
825 AM EDT THU APR 28 2011

...THE TORNADO WARNING IS CANCELLED FOR HARFORD AND BALTIMORE
COUNTIES...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE WARNED
AREA. THUS THE TORNADO WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. 

LAT...LON 3958 7681 3960 7684 3965 7682 3973 7673
      3972 7647
TIME...MOT...LOC 1225Z 229DEG 44KT 3974 7664

$$


BJL

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this tornado warning went out at Apr 28, 3:30 AM EDT, 4 hours 44 minutes earlier.

Area forecast discussion, Apr 28, 3:30 AM EDT, 4 hours 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
330 AM EDT THU APR 28 2011

.SYNOPSIS...
A COLD FRONT OVER EASTERN OHIO WILL CROSS THE MID-ATLANTIC REGION
LATE THIS MORNING AND EARLY THIS AFTERNOON. HIGH PRESSURE BUILDING
IN AT THE END OF THE WEEK WILL BRING DRIER AND COOLER CONDITIONS
THROUGH THE WEEKEND. ANOTHER COLD FRONT MAY IMPACT THE AREA MONDAY
OR TUESDAY.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...

TOR WATCH ACROSS THE ENTIRE CWA IS IN EFFECT UNTIL 8 AM. PTNLY
DANGEROUS SITUATION WE ARE WATCHING. SPOTTERS/PUBLIC PLS RELAY
REPORTS TO THE NWS/COUNTY EMERGENCY MGRS IF YOU XPRNC DAMAGING WX.
BUFKIT HODOGRAPHS CONTINUE TO SHOW A HIGH HELICITY ENVIRONMENT -
THRU ARND 8 AM IN THE HIGHLANDS TO EARLY AFTERNOON IN THE BAY.

AMAZING KUDOS TO THE MDLS. I WORKED THE XTND DESK LAST THU...AND
WROTE THIS - "LOW PRES WL TRACK SE INTO SRN QUEBEC NEXT THU...ALLOWING
A CD FNT TO PUSH OFF THE E CST." IT DOESN'T ALWAYS WORK THIS
WAY...BUT THIS IS TREMENDOUS - PROGRAMMERS...COMPUTERS...A COLD
FRONT ALMOST EXACTLY A WK IN ADVANCE. WOW.

WE ARE ISSUING SVR/TOR/FFW FOR THE STORMS CURRENTLY FM WASHINGTON
COUNTY TO AUGUSTA. W/ THIS HIGH CAPE/HELICITY ENVIRONMENT AND
THESE STORMS TREMENDOUS HISTORY FOR DAMAGE WE'LL CONTINUE TO KEEP
OUR EYES TO THE RDR THRUT THE MRNG.

FRONT WILL MOVE ONTO THE ERN SHORE BY EARLY AFTN TDA...BRINGING AN
END TO THE SEVERE THREAT.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/...

COLD FRONT WILL MOVE OFF THE COAST WHILE THE UPPER TROUGH WILL
PROGRESS THRU THE AREA...WHICH WILL ENHANCE CLOUD COVER OVER THE CWA
THRU FRI...BUT IT SHOULD STAY DRY ACROSS MOST OF THE AREA. THE
EXCEPTION WILL BE THE WRN SLOPES OF THE ALLEGHENY FRONT AS
CYCLONIC/UPSLOPE FLOW AROUND THE TROUGH WILL PRODUCE SCT SHOWERS.
FRI WILL FEEL MORE LIKE SPRING...WITH HIGHS IN THE 60S ACROSS THE
HIGHLANDS AND NEAR 70F EAST OF THE BLUE RIDGE...AND DEWPOINTS IN THE
30S AND 40S. A TIGHT PRESSURE GRADIENT BETWEEN THE EXITING LOW AND
HIPRES BUILDING IN FROM THE SOUTHEAST WILL PRODUCE BREEZY CONDITIONS
WITH AFTN GUSTS 25 TO 35 MPH.

&&

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...

HIPRES DOMINATES THE REGIONAL WX PATTERN THRU MUCH OF THE WEEKEND
BEFORE IT MOVES OFF THE COAST SUN. A NRN STREAM SHORTWAVE TROUGH
WILL TRACK ACROSS THE GREAT LAKES REGION WHILE THE ASSOCIATED COLD
FRONT PUSHES THRU THE MID-ATLANTIC REGION MON/TUE. THERE ARE STILL
TIMING DIFFERENCES AMONG OPERATIONAL MODELS. THIS SYSTEM WILL BRING
CHANCES FOR SHOWERS AND POSSIBLY STORMS DEPENDING ON THE EXACT
TIMING OF FROPA.

&&

.AVIATION /07Z THURSDAY THROUGH MONDAY/...

THROUGH 12Z...THERE REMAINS A RISK OF SVR THUNDERSTORM AFFECTING THE
HUBS. TOR WATCH IS IN EFFECT. STORMS TO THE SW HAVE HAD A VERY
DAMAGING HISTORY...AND EVEN THOUGH WE ARE IN OVRNGT HRS THE
ATMOSPHERE (WHICH SEEMS MORE LK AUG THAN APR) IS PRIMED BTWN CAPE
AND SHEAR. COLD FRONT WL MOVE INTO THE BAY ARND NOON ENDING THE
RISK FOR THUNDERSTORMS AND USHERING IN A WIND SHIFT TO THE
WEST/NORTHWEST.

VFR CONDITIONS THU NGT THRU THE WEEKEND AS HIPRES BUILDS INTO THE
AREA. A TIGHT PRESSURE GRADIENT BETWEEN THE BUILDING HIGH AND
EXITING LOPRES TO OUR NORTH WILL CREATE BREEZY CONDITIONS FRI WITH
GUSTS TO 30 KT POSSSIBLE.

&&

.MARINE...
TOR WATCH FOR THE WATERS THROUGH 8 AM THIS MRNG.

SCA REMAINS IN EFFECT TONIGHT FOR GRADIENT WIND IN SOUTHERLY FLOW.
GRADIENT TIGHTENS THIS MORNING AHEAD OF THE COLD FRONT. GALE WRNG UP
FOR THE LOWER MD BAY/POTOMAC AREA WITH SOLID SCA ELSEWHERE.
ORGANIZED THUNDERSTORMS MAY PRODUCE STRONG GUSTY WINDS THURSDAY
MORNING-EARLY AFTERNOON AS WELL.

SCA CONTINUES INTO THU EVE FOR THE LOWER HALF OF THE MD CHSPK BAY
AND THE LWR TIDAL POTOMAC. AFTER A BRIEF LULL IN THE WINDSWINDS WILL
RELAX THIS WEEKEND AS HIPRES SETTLES OVER THE AREA. SLY WINDS WILL
INCREASE TO NEAR SCA LVLS AHEAD OF THE NEXT COLD FRONT LATE SUN INTO
MON.

&&

.TIDES/COASTAL FLOODING...

POSITIVE TIDAL ANOMALIES WILL CONTINUE THROUGH AT LEAST THE NEXT
HIGH TIDE CYCLE. ANOMALIES WERE RUNNING 1/2 FT TO 1 FT ABOVE
NORMAL THIS EVENING AND MAY INCREASE A LITTLE THROUGH THE NEXT
CYCLE. SENSITIVE LOCATIONS SUCH AS ANNAPOLIS MAY COME CLOSE TO
MINOR TIDAL FLOODING THRESHOLDS AND WILL NEED TO BE WATCHED
CLOSELY. LATEST FORECAST PUTS ANNAPOLIS AT 2.2 OR 2.3 FT MLLW
WHICH IS JUST BELOW THE THRESHOLD OF 2.4 FT.

&&

.CLIMATE...

RECORD HIGH MIN TEMP RECORDS WERE TIED/BRKN ON WED.

MIN TEMPS

DCA 66     PRVS RECORD  65 1908/1990/1994
BWI 68     PRVS RECORD  68     1915
IAD 68     PRVS RECORD  63     2009

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...FLASH FLOOD WATCH UNTIL 10 AM EDT THIS MORNING FOR MDZ003-501-
     502.
VA...FLASH FLOOD WATCH UNTIL 10 AM EDT THIS MORNING FOR VAZ025>028-
     503-504.
WV...FLASH FLOOD WATCH UNTIL 10 AM EDT THIS MORNING FOR WVZ050>052-
     055-501>506.
MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EDT THIS EVENING FOR
     ANZ530>532-535-536-538>540-542.
     SMALL CRAFT ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR ANZ533-541.
     SMALL CRAFT ADVISORY UNTIL 6 AM EDT EARLY THIS MORNING FOR
     ANZ534-537-543.
     SMALL CRAFT ADVISORY FROM 6 PM THIS EVENING TO MIDNIGHT EDT
     TONIGHT FOR ANZ534-537-543.
     GALE WARNING FROM 6 AM THIS MORNING TO 6 PM EDT THIS EVENING
     FOR ANZ534-537-543.

&&

PRODUCTS...WOODY!

Hazardous weather outlook, Apr 28, 8:12 AM EDT, 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
812 AM EDT THU APR 28 2011

ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
291000-
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-
812 AM EDT THU APR 28 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...TODAY AND TONIGHT

A TORNADO WATCH IS IN EFFECT UNTIL 3 PM. STORMS HAVE THE POTENTIAL
TO PRODUCE DAMAGING WIND GUSTS...LARGE HAIL AND TORNADOES THROUGH
THE EARLY AFTERNOON.

A FLASH FLOOD WATCH IS IN EFFECT THROUGH THE EARLY AFTERNOON.
PLEASE REFER TO THE LATEST HAZARD MESSAGE /FFALWX/ FOR DETAILS.

A GALE WARNING IS IN EFFECT TODAY FOR THE MARYLAND CHESAPEAKE BAY
FROM DRUM POINT TO SMITH POINT...AND FOR THE TIDAL POTOMAC RIVER
FROM COBB ISLAND TO SMITH POINT. A SMALL CRAFT ADVISORY IS IN
EFFECT TODAY FOR THE REMAINDER OF THE MARYLAND CHESAPEAKE BAY AND
TIDAL POTOMAC RIVER.

A SMALL CRAFT ADVISORY IS IN EFFECT THIS EVENING FOR THE LOWER
TIDAL POTOMAC RIVER AND THE MARYLAND CHESAPEAKE BAY SOUTH OF NORTH
BEACH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A SMALL CRAFT ADVISORY WILL LIKELY BE NEEDED FOR THE WATERS
FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS IN EFFECT. PLEASE REPORT ANY STORM
INFORMATION TO THE NATIONAL WEATHER SERVICE.

MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504-
WVZ050>053-055-501>506-291000-
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-
812 AM EDT THU APR 28 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...TODAY AND TONIGHT

A TORNADO WATCH IS IN EFFECT UNTIL 3 PM FOR COUNTIES EAST OF THE
BLUE RIDGE. STORMS HAVE THE POTENTIAL TO PRODUCE DAMAGING WIND
GUSTS...LARGE HAIL AND TORNADOES THROUGH THE EARLY AFTERNOON.

A FLASH FLOOD WATCH IS IN EFFECT FOR COUNTIES EAST OF THE BLUE
RIDGE AS WELL AS THE FAR EASTERN WEST VIRGINIA PANHANDLE THROUGH
THE EARLY AFTERNOON. PLEASE REFER TO THE LATEST HAZARD MESSAGE
/FFALWX/ FOR DETAILS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS IN EFFECT. PLEASE REPORT ANY STORM
INFORMATION TO THE NATIONAL WEATHER SERVICE.

In the hours before

Local storm report, Apr 28, 7:14 AM EDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
714 AM EDT THU APR 28 2011

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

0319 PM     HAIL             7 SSE ELMA              37.66N  78.72W
04/27/2011  E0.75 INCH       NELSON             VA   TRAINED SPOTTER

0339 PM     HAIL             2 WSW SCOTTSVILLE       37.79N  78.52W
04/27/2011  E0.75 INCH       ALBEMARLE          VA   PUBLIC

0345 PM     HAIL             1 NW SCOTTSVILLE        37.81N  78.50W
04/27/2011  E1.00 INCH       ALBEMARLE          VA   PUBLIC

0450 PM     HAIL             1 W THORNHILL           38.15N  77.99W
04/27/2011  E1.00 INCH       ORANGE             VA   TRAINED SPOTTER

0510 PM     HAIL             4 N BELMONT             38.20N  77.87W
04/27/2011  E0.88 INCH       ORANGE             VA   PUBLIC

0607 PM     FUNNEL CLOUD     2 SE CHANCELLORSVILLE   38.28N  77.60W
04/27/2011                   SPOTSYLVANIA       VA   TRAINED SPOTTER

            FUNNEL CLOUD SPOTTED ABOUT 7 MILES WEST OF
            FREDERICKSBURG... VA

0610 PM     FUNNEL CLOUD     2 SSE GARRISONVILLE     38.46N  77.41W
04/27/2011                   STAFFORD           VA   LAW ENFORCEMENT

            PASSING OVER 95. LOWERING.

0614 PM     TORNADO          2 W TRIANGLE            38.55N  77.35W
04/27/2011                   PRINCE WILLIAM     VA   AWOS

            REPORTED BY QUANTICO OBSERVER 1 TO 2 MILES WEST OF
            QUANTICO.

0616 PM     HAIL             DUMFRIES                38.57N  77.33W
04/27/2011  M1.00 INCH       PRINCE WILLIAM     VA   911 CALL CENTER

            QUARTER SIZE HAIL IN DUMFRIES

0624 PM     TSTM WND DMG     1 SSW DUMFRIES          38.56N  77.33W
04/27/2011                   PRINCE WILLIAM     VA   911 CALL CENTER

            LARGE TREE DOWN ACROSS ROADWAY IN THE DUMFRIES AND
            TRIANGLE AREA

0643 PM     FUNNEL CLOUD     POTOMAC HEIGHTS         38.61N  77.12W
04/27/2011                   CHARLES            MD   TRAINED SPOTTER

            SPOTTER CHN41

0645 PM     FUNNEL CLOUD     BRYANS ROAD             38.63N  77.07W
04/27/2011                   CHARLES            MD   LAW ENFORCEMENT

0709 PM     FUNNEL CLOUD     1 W CLINTON             38.76N  76.92W
04/27/2011                   PRINCE GEORGES     MD   TRAINED SPOTTER

            JUST WEST OF CLINTON FIREHOUSE.

0715 PM     HAIL             TANEYTOWN               39.66N  77.17W
04/27/2011  E0.88 INCH       CARROLL            MD   TRAINED SPOTTER

0717 PM     FUNNEL CLOUD     1 N CLINTON             38.78N  76.90W
04/27/2011                   PRINCE GEORGES     MD   TRAINED SPOTTER

0717 PM     FUNNEL CLOUD     1 N CLINTON             38.78N  76.90W
04/27/2011                   PRINCE GEORGES     MD   TRAINED SPOTTER

            SPOTTER REPORTED A FUNNEL CLOUD 1 MILE NORTH OF
            CLINTON... MD

0722 PM     TORNADO          1 S MORNINGSIDE         38.82N  76.89W
04/27/2011                   PRINCE GEORGES     MD   TRAINED SPOTTER

            LARGE BRANCHES AND SHINGLES ON ALLENTOWN ROAD. A BIG
            ROAD SIGN BLOWN DOWN NEAR ANDREWS AIRFORCE BASE.

0725 PM     TSTM WND DMG     1 SE MORNINGSIDE        38.82N  76.88W
04/27/2011                   PRINCE GEORGES     MD   TRAINED SPOTTER

            AT LEAST 9 TREE BRANCHES 8-10 INCHES IN DIAMETER AS
            WELL AS A LARGE TREE 18-20 INCHES IN DIAMETER BLOWN IN
            THE DIRECTION FROM ANDREW AFB TOWARD ALLENTOWN ROAD.

0725 PM     FUNNEL CLOUD     1 WNW BRYANS ROAD       38.63N  77.09W
04/27/2011                   CHARLES            MD   BROADCAST MEDIA

            FUNNEL CLOUD REPORTED BETWEEN INDIAN HEAD AND ACCOKEEK

0727 PM     FUNNEL CLOUD     5 NNE BROOKEVILLE       39.24N  77.02W
04/27/2011                   HOWARD             MD   TRAINED SPOTTER

1042 PM     FUNNEL CLOUD     2 WSW NOKESVILLE        38.69N  77.62W
04/27/2011                   FAUQUIER           VA   911 CALL CENTER

            RELAYED TO 911 DISPATCH THAT A FUNNEL CLOUD WAS
            REPORTED NEAR INTERSECTION OF RT 28 AND PRINCE WILLIAM
            COUNTY PARKWAY

1045 PM     TSTM WND DMG     3 NE NOKESVILLE         38.73N  77.55W
04/27/2011                   PRINCE WILLIAM     VA   911 CALL CENTER

            INSIDE CEILING PANELS WERE BLOWN OUT OF HARRIS TEETER
            IN BRISTOW CENTER

1045 PM     TSTM WND DMG     1 SSE NOKESVILLE        38.68N  77.57W
04/27/2011                   PRINCE WILLIAM     VA   911 CALL CENTER

            TREE BLOWN ONTO POWER LINES CAUSING SPARKS

1057 PM     TORNADO          3 NE NOKESVILLE         38.73N  77.55W
04/27/2011                   PRINCE WILLIAM     VA   911 CALL CENTER

            STRUCTURAL DAMAGE TO RETAIL SHOPPING CENTER.

0110 AM     HAIL             LONACONING              39.57N  78.98W
04/28/2011  M0.75 INCH       ALLEGANY           MD   TRAINED SPOTTER

0122 AM     HAIL             CORRIGANVILLE           39.69N  78.79W
04/28/2011  M0.75 INCH       ALLEGANY           MD   FIRE DEPT/RESCUE

            DIME SIZE HAIL NEAR CORRIGANVILLE FIRE STATION IN
            CORRIGANVILLE... MD

0122 AM     TSTM WND DMG     CORRIGANVILLE           39.69N  78.79W
04/28/2011                   ALLEGANY           MD   FIRE DEPT/RESCUE

            SEVERAL TREE LIMBS BLOWN DOWN NEAR CORRIGANVILLE FIRE
            STATION IN CORRIGANVILLE... MD. TREE LIMBS ABOUT ONE AND
            ONE HALF INCHES IN DIAMETER.

0200 AM     FLASH FLOOD      4 SW MAYSVILLE          39.07N  79.22W
04/28/2011                   GRANT              WV   TRAINED SPOTTER

            FLASH FLOODING ON JORDAN RUN ROAD ALONG THE NORTH FORK
            OF LUNICE CREEK.

0200 AM     FLASH FLOOD      KLINE GAP               39.07N  79.19W
04/28/2011                   GRANT              WV   TRAINED SPOTTER

            CORNERS ROAD CLOSED DUE TO FLASH FLOODING ALONG LUNICE
            CREEK.

0200 AM     FLASH FLOOD      MAYSVILLE               39.12N  79.17W
04/28/2011                   GRANT              WV   911 CALL CENTER

            NUMEROUS REPORTS OF FLASH FLOODING IN AND AROUND
            MAYSVILLE. STRUCTURAL DAMAGE AT RESIDENCE IN MAYSVILLE.
            MULTIPLE ROADS CLOSED.

0200 AM     FLASH FLOOD      1 WNW BURLINGTON        39.34N  78.93W
04/28/2011                   MINERAL            WV   911 CALL CENTER

            FLASH FLOODING ON ROUTE 50.

0212 AM     TSTM WND DMG     2 S YANKEETOWN          38.65N  78.95W
04/28/2011                   ROCKINGHAM         VA   911 CALL CENTER

            LARGE TREE DOWN AND POWER LINES DOWN IN THE 15000 AND
            16000 BLOCK OF LITTLE DRY RIVER ROAD NEAR FULKS RUN...
            VA

0221 AM     TORNADO          2 SSE ORKNEY SPRINGS    38.76N  78.80W
04/28/2011                   SHENANDOAH         VA   911 CALL CENTER

            TREES DOWN AND STRUCTURAL DAMAGE TO HOUSE.

0230 AM     FLASH FLOOD      AUGUSTA                 39.30N  78.64W
04/28/2011                   HAMPSHIRE          WV   TRAINED SPOTTER

            ROUTE 50 CLOSED DUE TO FLASH FLOODING IN AUGUSTA.

0246 AM     TSTM WND GST     2 ENE ALONZAVILLE       38.94N  78.52W
04/28/2011  M62 MPH          SHENANDOAH         VA   MESONET

0249 AM     TSTM WND GST     1 WSW STRASBURG         38.98N  78.37W
04/28/2011  M58 MPH          SHENANDOAH         VA   MESONET

0305 AM     TSTM WND DMG     1 SSE WAPOCOMO          39.38N  78.73W
04/28/2011                   HAMPSHIRE          WV   911 CALL CENTER

            TREE DOWN ON WHISPER VALLEY ROAD

0322 AM     TSTM WND DMG     2 S WARDENSVILLE        39.05N  78.59W
04/28/2011                   HARDY              WV   911 CALL CENTER

            TREES DOWN AT WAITES RUN. MUCH OF WARDENSVILLE W O
            POWER.

0340 AM     FLASH FLOOD      1 E SAINT JAMES         39.57N  77.73W
04/28/2011                   WASHINGTON         MD   911 CALL CENTER

            WATER OVER ROUTE 65 AT ROXBURY RD.

0510 AM     TSTM WND DMG     2 WSW KEEZLETOWN        38.40N  78.85W
04/28/2011                   ROCKINGHAM         VA   EMERGENCY MNGR

            ROOF GONE... SIDE OF HOUSE DOWN AT 430 BOYERS RD

0649 AM     TSTM WND DMG     BEALLSVILLE             39.18N  77.41W
04/28/2011                   MONTGOMERY         MD   EMERGENCY MNGR

            MULTIPLE TREES DOWN

0655 AM     FUNNEL CLOUD     POINT OF ROCKS          39.28N  77.54W
04/28/2011                   FREDERICK          MD   AMATEUR RADIO

&&

EVENT NUMBER LWX1100510 LWX1100512 LWX1100511 LWX1100513 LWX1100514
LWX1100516 LWX1100515 LWX1100517 LWX1100528 LWX1100529 LWX1100518
LWX1100519 LWX1100520 LWX1100521 LWX1100522 LWX1100523 LWX1100525
LWX1100526 LWX1100527 LWX1100524 LWX1100533 LWX1100530 LWX1100532
LWX1100531 LWX1100534 LWX1100535 LWX1100536 LWX1100537 LWX1100538
LWX1100539 LWX1100540 LWX1100541 LWX1100547 LWX1100545 LWX1100544
LWX1100542 LWX1100546 LWX1100543 LWX1100549 LWX1100548 LWX1100551
LWX1100550

SMZ

Local storm report, Apr 28, 7:25 AM EDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
725 AM EDT THU APR 28 2011

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

0724 AM     FLASH FLOOD      LUCKETTS                39.22N  77.53W
04/28/2011                   LOUDOUN            VA   EMERGENCY MNGR

            WATER RESCUE ONGOING ON NEW VALLEY CHURCH ROAD NEAR
            LUCKETTS. NUMEROUS ROADS COVERED WITH WATER BETWEEN
            MIDDLEBURG AND LUCKETTS.

&&

EVENT NUMBER LWX1100552

JE

Local storm report, Apr 28, 7:43 AM EDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
743 AM EDT THU APR 28 2011

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

0216 AM     TSTM WND DMG     1 N TUNIS               38.71N  78.87W
04/28/2011                   ROCKINGHAM         VA   PUBLIC

            MULTIPLE TREES DOWN. TOPS TWISTED OFF.

&&

EVENT NUMBER LWX1100553

SMZ

Local storm report, Apr 28, 7:59 AM EDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
759 AM EDT THU APR 28 2011

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

0759 AM     FLASH FLOOD      LEESBURG                39.10N  77.56W
04/28/2011                   LOUDOUN            VA   EMERGENCY MNGR

            WATER RESCUE ONGOING AT DRY MILL ROAD IN LEESBURG.
            NUMEROUS ROADS THROUGHOUT THE COUNTY EITHER CLOSED OR
            WITH PARTIAL RESTRICTIONS.

&&

EVENT NUMBER LWX1100554

JE

Local storm report, Apr 28, 8:08 AM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
808 AM EDT THU APR 28 2011

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

0649 AM     TSTM WND DMG     1 NNE BEALLSVILLE       39.20N  77.41W
04/28/2011                   MONTGOMERY         MD   EMERGENCY MNGR

            TREES DOWN OFF BIG WOODS ROAD

&&

EVENT NUMBER LWX1100555

STRONG

Local storm report, Apr 28, 8:09 AM EDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
809 AM EDT THU APR 28 2011

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

0649 AM     TSTM WND DMG     BARNESVILLE             39.22N  77.38W
04/28/2011                   MONTGOMERY         MD   EMERGENCY MNGR

            TREES DOWN OVER ROUTE 109

&&

EVENT NUMBER LWX1100556

STRONG

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 27, 8:19 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Montgomery, Washington	36 min
Apr 27, 8:28 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	19 min
Apr 27, 8:56 PM EDT	Special Weather Statement	LWX	Frederick	34 min
Apr 27, 10:39 PM EDT	Special Weather Statement	LWX	Allegany	111 min
Apr 28, 12:35 AM EDT	Flash Flood Warning	LWX	Allegany	5 hr
Apr 28, 12:35 AM EDT	Severe Thunderstorm Warning	LWX	Allegany	70 min
Apr 28, 1:18 AM EDT	Tornado Warning	LWX	Allegany	27 min
Apr 28, 1:29 AM EDT	Severe Thunderstorm Warning	LWX	Allegany, Washington	35 min
Apr 28, 1:33 AM EDT	Flash Flood Warning	LWX	Allegany, Washington	4 hr
Apr 28, 2:59 AM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	62 min
Apr 28, 3:04 AM EDT	Flash Flood Warning	LWX	Washington	7 hr
Apr 28, 4:24 AM EDT	Tornado Warning	LWX	Carroll, Frederick, Washington	51 min
Apr 28, 5:09 AM EDT	Special Weather Statement	LWX	Frederick	51 min
Apr 28, 5:35 AM EDT	Tornado Warning	LWX	Frederick	26 min
Apr 28, 5:43 AM EDT	Tornado Warning	LWX	Frederick	18 min
Apr 28, 6:06 AM EDT	Special Weather Statement	LWX	Harford	39 min
Apr 28, 6:37 AM EDT	Tornado Warning	LWX	Frederick, Montgomery	38 min
Apr 28, 7:05 AM EDT	Tornado Warning	LWX	Carroll, Frederick, Howard, Montgomery	25 min
Apr 28, 7:17 AM EDT	Tornado Warning	LWX	Carroll, Frederick	28 min
Apr 28, 7:27 AM EDT	Flash Flood Warning	LWX	Carroll, Frederick, Howard, Montgomery	5 hr
Apr 28, 7:55 AM EDT	Tornado Warning	LWX	Baltimore, Carroll, Frederick	27 min
Apr 28, 8:01 AM EDT	Flash Flood Warning	LWX	Frederick, Washington	119 min
Apr 28, 8:12 AM EDT	Tornado Warning	LWX	Carroll, Frederick	33 min
Apr 28, 8:45 AM EDT	Tornado Warning	LWX	Baltimore, Carroll	30 min
Apr 28, 9:14 AM EDT	Tornado Warning	LWX	Baltimore, Carroll, Frederick, Howard, Montgomery	31 min
Apr 28, 9:39 AM EDT	Severe Thunderstorm Warning	LWX	Howard, Montgomery	36 min
Apr 28, 9:45 AM EDT	Flash Flood Warning	LWX	Montgomery	101 min
Apr 28, 9:49 AM EDT	Tornado Warning	LWX	Baltimore, Harford	26 min
Apr 28, 9:58 AM EDT	Areal Flood Warning	LWX	Frederick, Washington	3 hr
Apr 28, 10:10 AM EDT	Special Weather Statement	LWX	Carroll, Howard	50 min
Apr 28, 10:36 AM EDT	Flash Flood Warning	LWX	Baltimore, Carroll, Harford	102 min
Apr 28, 10:38 AM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	52 min
Apr 28, 10:54 AM EDT	Special Weather Statement	LWX	Calvert, Charles, Prince George's, Saint Mary's	51 min
Apr 28, 10:54 AM EDT	Severe Thunderstorm Warning	LWX	Calvert, Charles, Saint Mary's	66 min
Apr 28, 11:09 AM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	36 min
Apr 28, 11:22 AM EDT	Tornado Warning	LWX	Anne Arundel	14 min
Apr 28, 11:26 AM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	18 min
Apr 28, 11:38 AM EDT	Coastal Flood Advisory	LWX	Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more	7 hr
Apr 28, 12:15 PM EDT	Areal Flood Warning	LWX	Baltimore, Carroll, Frederick, Harford, Montgomery	3 hr
Apr 28, 12:28 PM EDT	River Flood Warning	LWX	Washington	11 hr
Apr 28, 4:40 PM EDT	Special Weather Statement	LWX	Saint Mary's	50 min

Nearby

Tornado Warnings in Maryland, 2011 Every tornado warning in 2011 Tornadoes in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.