Alert archive / Virginia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 68, NWS Baltimore/Washington

April 27, 2011Albemarle County, Nelson County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 27, 2011, 3:01 PM EDT for Albemarle County, Nelson County, Virginia. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 27, 2011, 3:01 PM EDT (19:01 UTC)
Expired: Apr 27, 2011, 3:45 PM EDT
In force: 44 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Albemarle County, VA, Nelson County, VA

The radar

The Sterling radar (KLWX), 160 km from the middle of the area, began a volume at 19:03 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.

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 27, 1:23 PM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 7.0 hours before the alert went out and 104 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: 190 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Apr 27, 2:12 PM EDT, 49 minutes earlier.

Area forecast discussion, Apr 27, 2:12 PM EDT, 49 minutes before

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Hazardous weather outlook, Apr 27, 2:21 PM EDT, 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
221 PM EDT WED APR 27 2011

ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
281000-
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-
221 PM EDT WED APR 27 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...THIS AFTERNOON AND TONIGHT

A TORNADO WATCH IS IN EFFECT UNTIL 8 PM FOR THE OUTLOOK AREA.
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON.
ANY STORMS THIS AFTERNOON WILL HAVE THE POTENTIAL TO PRODUCE
DAMAGING WIND GUSTS...LARGE HAIL AND A FEW TORNADOES.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR ALL OF THE
OUTLOOK AREA PRIMARILY LATE TONIGHT. A COLD FRONT WILL CROSS THE
AREA LATE TONIGHT. ANY THUNDERSTORMS ALONG AND AHEAD OF THE COLD
FRONT WILL BE CAPABLE OF PRODUCING DAMAGING WINDS AND LARGE HAIL.

A SMALL CRAFT ADVISORY IS IN EFFECT THROUGH TONIGHT FOR THE
MARYLAND CHESAPEAKE BAY AND THE TIDAL POTOMAC RIVER.

TIDAL DEPARTURES WILL INCREASE TODAY AS SOUTHERLY FLOW STRENGTHENS
TODAY. WATER LEVELS MAY APPROACH THRESHOLDS FOR MINOR COASTAL
FLOODING LATE TONIGHT FOR LOW-LYING AREAS ALONG THE TIDAL POTOMAC
RIVER AND THE WESTERN SHORE OF THE MARYLAND CHESAPEAKE BAY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

MINOR COASTAL FLOODING IS POSSIBLE THURSDAY ALONG THE TIDAL
POTOMAC RIVER AND THE WESTERN SHORE OF THE MARYLAND CHESAPEAKE
BAY.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ON THURSDAY ACROSS
THE OUTLOOK AREA. THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG AND
AHEAD OF A COLD FRONT THAT WILL CROSS THE REGION. SOME STORMS MAY
BE SEVERE AND WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS
AND LARGE HAIL. STORMS ALSO MAY PRODUCE VERY HEAVY RAINFALL THAT
COULD LEAD TO LOCALIZED FLASH FLOODING.

A GALE WARNING IS IN EFFECT THURSDAY 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 FOR THE REMAINDER OF THE MARYLAND CHESAPEAKE BAY AND
TIDAL POTOMAC RIVER.

THE SMALL CRAFT ADVISORY CONTINUES THURSDAY EVENING FOR THE LOWER
TIDAL POTOMAC RIVER AND THE MARYLAND CHESAPEAKE BAY SOUTH OF NORTH
BEACH.

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

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS AFTERNOON AND LIKELY WILL
BE NEEDED LATE TONIGHT AND THURSDAY.

MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504-
WVZ050>053-055-501>506-281000-
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-
221 PM EDT WED APR 27 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...THIS AFTERNOON AND TONIGHT

A TORNADO WATCH IS IN EFFECT FOR MOST COUNTIES ALONG AND WEST OF
THE BLUE RIDGE MOUNTAINS. THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS THIS AFTERNOON THROUGH TONIGHT FOR THE ENTIRE
OUTLOOK AREA. SOME STORMS WILL BE CAPABLE OF PRODUCING DAMAGING
WIND GUSTS...LARGE HAIL AND TORNADOES. STORMS WILL DEVELOP ALONG
AND AHEAD OF A COLD FRONT LATE TONIGHT AND ALSO COULD BE SEVERE.
SOME STORMS ALSO COULD PRODUCE HEAVY RAINFALL THAT COULD LEAD TO
FLASH FLOODING.

A FLASH FLOOD WATCH IS IN EFFECT LATE TONIGHT FOR THE POTOMAC
HIGHLANDS...NORTHERN AND CENTRAL SHENANDOAH VALLEY...NORTH-CENTRAL
MARYLAND AND THE EASTERN WEST VIRGINIA PANHANDLE. PLEASE REFER TO
THE LATEST HAZARD MESSAGE /FFALWX/ FOR DETAILS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY FOR
COUNTIES ALONG AND EAST OF THE BLUE RIDGE MOUNTAINS. SOME STORMS
WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND LARGE HAIL.
SOME STORMS COULD PRODUCE HEAVY RAINFALL THAT COULD LEAD TO FLASH
FLOODING.

A WIND ADVISORY MAY BE NEEDED FOR THE RIDGE TOPS OF THE POTOMAC
AND ALLEGHENY HIGHLANDS THURSDAY FOR STRONG WINDS BEHIND THE COLD
FRONT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS AFTERNOON...AND LIKELY WILL
BE NEEDED LATE TONIGHT THROUGH THURSDAY.

In the hours before

Local storm report, Apr 27, 12:59 PM EDT, 2 hours 2 minutes before

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Local storm report, Apr 27, 1:36 PM EDT, 1 hour 25 minutes before

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Local storm report, Apr 27, 2:32 PM EDT, 29 minutes before

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Local storm report, Apr 27, 2:53 PM EDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
253 PM EDT WED APR 27 2011

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

0803 PM     TSTM WND DMG     3 N RIG                 39.08N  79.04W
04/26/2011                   HARDY              WV   LAW ENFORCEMENT

            LARGE OAK TREE DOWN ON SYNDERVILLE RD

&&

EVENT NUMBER LWX1100509

JRK

Special weather statement, Apr 27, 2:54 PM EDT, 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
254 PM EDT WED APR 27 2011

VAZ036-037-271945-
NELSON VA-ALBEMARLE VA-
254 PM EDT WED APR 27 2011

...STRONG THUNDERSTORM TO AFFECT NELSON AND ALBEMARLE COUNTIES...

AT 254 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES
SOUTHWEST OF PIEDMONT...MOVING NORTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE SHIPMAN AND SCHUYLER.

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.

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

&&

LAT...LON 3756 7892 3764 7895 3770 7900 3819 7866
      3794 7836 3781 7848 3775 7851 3775 7863
      3771 7866 3769 7865 3769 7869 3763 7873
      3764 7882 3755 7883 3753 7886
TIME...MOT...LOC 1854Z 222DEG 39KT 3759 7892

SBK

Special weather statement, Apr 27, 2:56 PM EDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
256 PM EDT WED APR 27 2011

MDZ017-018-271930-
CALVERT MD-ST. MARYS MD-
256 PM EDT WED APR 27 2011

...STRONG THUNDERSTORM TO AFFECT CALVERT AND ST. MARYS COUNTIES...

AT 257 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
GREAT MILLS...MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE CHESAPEAKE RANCH ESTATES...LUSBY AND SAINT
LEONARD CREEK.

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.

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

&&

LAT...LON 3827 7638 3825 7638 3813 7650 3813 7652
      3814 7654 3818 7655 3823 7662 3837 7652
      3836 7649 3839 7651 3847 7646 3839 7637
      3833 7640 3829 7636
TIME...MOT...LOC 1857Z 211DEG 28KT 3827 7646

SBK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 8:45 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Rockingham, Shenandoah	45 min
Apr 26, 9:01 PM EDT	Tornado Warning	LWX	Frederick, Shenandoah	29 min
Apr 26, 9:31 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, Shenandoah, City of Winchester	9 min
Apr 26, 9:32 PM EDT	Special Weather Statement	LWX	Shenandoah	28 min
Apr 27, 9:51 AM EDT	Flash Flood Watch	LWX	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 20 more	29 hr
Apr 27, 10:11 AM EDT	Gale Warning	LWX		29 hr
Apr 27, 2:13 PM EDT	Small Craft Advisory	LWX		29 hr
Apr 27, 2:51 PM EDT	Special Marine Warning	LWX		39 min
Apr 27, 2:54 PM EDT	Special Weather Statement	LWX	Albemarle, Nelson, City of Charlottesville	51 min
Apr 27, 3:28 PM EDT	Special Marine Warning	LWX		47 min
Apr 27, 3:43 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Orange	47 min
Apr 27, 3:54 PM EDT	Special Marine Warning	LWX		26 min
Apr 27, 4:15 PM EDT	Special Weather Statement	LWX	City of Charlottesville	30 min
Apr 27, 4:30 PM EDT	Special Weather Statement	LWX	Orange	30 min
Apr 27, 4:39 PM EDT	Special Marine Warning	LWX		96 min
Apr 27, 4:44 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Orange, Spotsylvania	46 min
Apr 27, 4:50 PM EDT	Special Weather Statement	LWX	Madison	25 min
Apr 27, 5:08 PM EDT	Tornado Warning	LWX	Orange, Spotsylvania	37 min
Apr 27, 5:30 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Orange, Spotsylvania, Stafford	45 min
Apr 27, 5:46 PM EDT	Tornado Warning	LWX	Prince William, Spotsylvania, Stafford	29 min
Apr 27, 5:47 PM EDT	Special Weather Statement	LWX	Culpeper	28 min
Apr 27, 5:48 PM EDT	Special Marine Warning	LWX		57 min
Apr 27, 6:08 PM EDT	Tornado Warning	LWX	Fairfax, Prince William, Stafford	37 min
Apr 27, 6:17 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Prince William	43 min
Apr 27, 6:26 PM EDT	Special Weather Statement	LWX	Stafford	34 min
Apr 27, 6:42 PM EDT	Special Marine Warning	LWX		63 min
Apr 27, 6:47 PM EDT	Severe Thunderstorm Warning	LWX	Nelson	14 min
Apr 27, 6:59 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	33 min
Apr 27, 7:00 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Prince William	32 min
Apr 27, 7:19 PM EDT	Special Weather Statement	LWX	Orange	26 min
Apr 27, 7:21 PM EDT	Flash Flood Warning	LWX	Fairfax, Prince William	69 min
Apr 27, 7:27 PM EDT	Severe Thunderstorm Warning	LWX	Greene, Madison, Orange	25 min
Apr 27, 7:28 PM EDT	Special Marine Warning	LWX		65 min
Apr 27, 7:36 PM EDT	Special Weather Statement	LWX	Culpeper	24 min
Apr 27, 7:42 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Rappahannock	21 min
Apr 26, 8:38 PM EDT	Special Weather Statement	LWX	Allegany	37 min
Apr 26, 8:50 PM EDT	Severe Thunderstorm Warning	LWX	Allegany	22 min
Apr 26, 8:52 PM EDT	Tornado Warning	LWX	Allegany	19 min
Apr 27, 2:56 PM EDT	Special Weather Statement	LWX	Saint Mary's	34 min
Apr 27, 3:16 PM EDT	Special Weather Statement	LWX	Saint Mary's	29 min
Apr 27, 3:37 PM EDT	Special Weather Statement	LWX	Calvert	23 min
Apr 27, 6:38 PM EDT	Tornado Warning	LWX	Charles, Prince George's	37 min
Apr 27, 7:08 PM EDT	Tornado Warning	LWX	Anne Arundel, Prince George's	37 min
Apr 27, 7:16 PM EDT	Special Weather Statement	LWX	Carroll	29 min
Apr 27, 7:24 PM EDT	Tornado Warning	LWX	Charles, Prince George's	36 min
Apr 27, 7:27 PM EDT	Special Weather Statement	LWX	Howard	33 min
Apr 27, 7:31 PM EDT	Tornado Warning	LWX	Baltimore, Carroll, Howard	29 min
Apr 27, 7:34 PM EDT	Tornado Warning	LWX	Anne Arundel, Prince George's	26 min
Apr 26, 8:01 PM EDT	Severe Thunderstorm Warning	LWX	Grant, Hardy, Pendleton	44 min
Apr 26, 8:32 PM EDT	Special Weather Statement	LWX	Pendleton	28 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2011 Every severe thunderstorm warning 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.