Alert archive / Maryland / Tornado Warnings in 2011

Tornado Warning 58, NWS Baltimore/Washington

April 28, 2011Baltimore County, Harford County, Maryland

NWS Baltimore/Washington issued this tornado warning at Apr 28, 2011, 9:49 AM EDT for Baltimore County, Harford County, Maryland. It was in force for 26 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 28, 2011, 9:49 AM EDT (13:49 UTC)
Expired: Apr 28, 2011, 10:15 AM EDT
In force: 26 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Baltimore County, MD, Harford County, MD

The radar

The Sterling radar (KLWX), 102 km from the middle of the area, began a volume at 13:51 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.

What was reported inside it

Time	Report	Where	Remark
Apr 28, 9:54 AM EDT	TORNADO	2 Wnw Hereford, MD	BRIEF TOUCHDOWN IN WOODED AREA NORTH OF EVNA RD. DAMAGE WAS ALL TO TREES WITH NEARLY TWO DOZEN TREES UPROOTED AND OR TOPPED. RATED EF-O WITH MAX WINDS OF 70 MPH. WIDTH OF 75 YARDS. DURATION 1 MINUTE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this tornado warning; the first came 5 minutes after it went out.

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, 1.8 hours before the alert went out and 51 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.

832 
WFUS51 KLWX 281349
TORLWX
MDC005-025-281415-
/O.NEW.KLWX.TO.W.0058.110428T1349Z-110428T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
949 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 1015 AM EDT

* AT 946 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER NORTHERN
  BALTIMORE COUNTY...OR 9 MILES NORTHWEST OF COCKEYSVILLE...MOVING
  NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PARKTON...
  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 3954 7669 3962 7682 3973 7670 3972 7641
TIME...MOT...LOC 1349Z 223DEG 40KT 3961 7669

$$

1 follow-up statement

339 
WWUS51 KLWX 281357
SVSLWX

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

MDC005-025-281415-
/O.CON.KLWX.TO.W.0058.000000T0000Z-110428T1415Z/
BALTIMORE MD-HARFORD MD-
957 AM EDT THU APR 28 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 AM EDT FOR HARFORD
AND BALTIMORE COUNTIES...

AT 956 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS LOCATED 7 MILES SOUTH OF STEWARTSTOWN...OR 13 MILES NORTH
OF COCKEYSVILLE...MOVING NORTHEAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  RURAL NORTHWESTERN HARFORD COUNTY

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 3960 7660 3969 7667 3973 7661 3972 7641
TIME...MOT...LOC 1358Z 234DEG 44KT 3967 7656

$$

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, 8:53 AM EDT, 56 minutes earlier.

Area forecast discussion, Apr 28, 8:53 AM EDT, 56 minutes before

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

.SYNOPSIS...
A COLD FRONT ALONG THE BLUE RIDGE WILL CROSS THE REGION THROUGH
THE EARLY 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/...
NEW TOR WATCH 251 IN EFFECT FOR COUNTIES EAST OF THE BLUE RIDGE
UNTIL 3 PM. SETUP STILL FAVORABLE FOR TORNADOES ALONG THE LINE OF
STORMS NEAR THE COLD FRONT. DUE TO THE SLOW FORWARD PROGRESSION OF
THE FRONT...LOCALLY HEAVY RAINFALL AND FLASH FLOODING HAS BECOME A
HIGHER THREAT. HAVE ISSUED A FLASH FLOOD WATCH FOR COUNTIES ALONG
THE BLUE RIDGE UNTIL NOON AND COUNTIES ALONG AND EAST OF I-95
UNTIL 3 PM.

PREVIOUS DISCUSSION...

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 PROGRESSES
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 /13Z THURSDAY THROUGH MONDAY/...
THROUGH 19Z...THERE REMAINS A RISK OF SVR THUNDERSTORM AFFECTING
THE CHO/IAD/DCA/MTN/BWI. CHO AND IAD THREAT WILL LIKELY END
BEFORE MIDDAY THOUGH. TOR WATCH IS IN EFFECT. THE COLD FRONT WL
MOVE INTO THE BAY DURING THE  ERY AFTN ENDING THE RISK FOR
THUNDERSTORMS AND USHERING IN A WIND SHIFT TO THE WEST.

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 3 PM THIS AFTN. WIDESPREAD SCA
CONDITIONS EXPECTED OUTSIDE OF CONVECTION WITH A FEW GUSTS
APPROACHING GALE WRNG ACROSS THE SRN MOST MARINE ZONES.

SCA CONTINUES THIS 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 THIS AFTN. ANOMALIES WERE RUNNING 1 FT TO 1 1/2 FT
ABOVE NORMAL AS OF 830 AM. WE WILL CONTINUE TO MONITOR THE TIDES
AND THE TIMING OF THE FRONT /WHICH IS NOW OVER THE BLUE RIDGE/. A
COASTAL FLOOD ADVISORY MAY NEED TO BE ISSUED FOR THE AFTN HIGH
TIDE CYCLE.

&&

.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...FLASH FLOOD WATCH UNTIL 3 PM EDT THIS AFTERNOON FOR DCZ001.
MD...FLASH FLOOD WATCH UNTIL 3 PM EDT THIS AFTERNOON FOR MDZ005>007-
     009>011-013-014-016>018.
     FLASH FLOOD WATCH UNTIL NOON EDT TODAY FOR MDZ003-004.
VA...FLASH FLOOD WATCH UNTIL 3 PM EDT THIS AFTERNOON FOR VAZ050>057-
     502.
     FLASH FLOOD WATCH UNTIL NOON EDT TODAY FOR VAZ031-036>040-042-
     501.
WV...FLASH FLOOD WATCH UNTIL NOON EDT TODAY FOR WVZ053.
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 FROM 6 PM THIS EVENING TO MIDNIGHT EDT
     TONIGHT FOR ANZ534-537-543.
     GALE WARNING UNTIL 6 PM EDT THIS EVENING FOR ANZ534-537-543.

&&

UPDATE...KLEIN

Hazardous weather outlook, Apr 28, 8:12 AM EDT, 1 hour 37 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, 8:08 AM EDT, 1 hour 41 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, 1 hour 40 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

Local storm report, Apr 28, 8:57 AM EDT, 52 minutes before

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

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

0830 AM     FLASH FLOOD      3 ESE BALLENGER CREEK   39.36N  77.39W
04/28/2011                   FREDERICK          MD   NEWSPAPER

            MARYLAND STATE ROUTE 355 FLOODED AND CLOSED AT BALL
            ROAD NEAR MONOCACY BATTLEFIELD.

&&

EVENT NUMBER LWX1100557

JE

Local storm report, Apr 28, 9:02 AM EDT, 47 minutes before

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

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

0830 AM     FLASH FLOOD      LIBERTYTOWN             39.49N  77.25W
04/28/2011                   FREDERICK          MD   NEWSPAPER

            NORTH AND SOUTH STREETS FLOODED AND CLOSED BETWEEN
            ROUTE 75 AND TRAMMELS ALLEY.

&&

EVENT NUMBER LWX1100558

JE

Local storm report, Apr 28, 9:06 AM EDT, 43 minutes before

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

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

0516 AM     TSTM WND DMG     MIDDLEBURG              38.97N  77.74W
04/28/2011                   LOUDOUN            VA   911 CALL CENTER

            TREE DOWN ON WIRES.

&&

EVENT NUMBER LWX1100559

SMZ

Local storm report, Apr 28, 9:08 AM EDT, 41 minutes before

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

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

0906 AM     FLASH FLOOD      3 SSW CAVETOWN          39.60N  77.61W
04/28/2011                   WASHINGTON         MD   TRAINED SPOTTER

            CREEK FLOWING ACROSS ROAD AT MOUNT ETNA ROAD AND COUNTY
            ROAD 66

&&

EVENT NUMBER LWX1100560

MEADOWS

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, 8:14 AM EDT	Tornado Warning	LWX	Baltimore, Harford	11 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, 9:58 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.