Alert archive / Virginia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 252, NWS Baltimore/Washington

July 3, 2011Albemarle County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 3, 2011, 4:52 PM EDT for Albemarle County, Virginia. It was in force for 24 min. 4 reports 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
Jul 3, 2011, 4:52 PM EDT (20:52 UTC)
Expired
Jul 3, 2011, 5:16 PM EDT
In force
24 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon

County Albemarle County, VA

The radar

The Sterling radar (KLWX), 124 km from the middle of the area, began a volume at 20:53 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

TimeReportWhereRemark
Jul 3, 4:55 PM EDTHAIL 1.51 E Stony Point, VAHAIL LASTED APPROXIMATELY 10 MINUTES
Jul 3, 4:57 PM EDTTSTM WND DMG1 Nnw Stony Point, VALARGE BRANCHES DOWN IN THE AREA
Jul 3, 4:57 PM EDTHAIL 11 Nnw Stony Point, VA
Jul 3, 5:00 PM EDTHAIL 0.751 Wsw Rosena, VA

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

The watch it was issued in

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

IssuedProductOfficeLasted
Jul 3, 4:21 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.9 hours before the alert went out and 126 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2011-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 750 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2011-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
750 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
781 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
-32 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

748 
WUUS51 KLWX 032052
SVRLWX
VAC003-032145-
/O.NEW.KLWX.SV.W.0252.110703T2052Z-110703T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
452 PM EDT SUN JUL 3 2011

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ALBEMARLE COUNTY IN CENTRAL VIRGINIA...

* UNTIL 545 PM EDT

* AT 448 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF
  QUARTERS AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED OVER NORTHEASTERN ALBEMARLE COUNTY...OR 9 MILES NORTHEAST
  OF CHARLOTTESVILLE...AND MOVING SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CISMONT...
  KESWICK...
  COBHAM...
  CAMPBELL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WIND GUSTS...LARGE HAIL AND FREQUENT CLOUD
TO GROUND LIGHTNING. MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY
FROM WINDOWS.

&&

LAT...LON 3812 7847 3819 7840 3813 7821 3811 7821
      3801 7830 3799 7832 3799 7833
TIME...MOT...LOC 2053Z 304DEG 15KT 3813 7837

$$

SMZ
3 follow-up statements
304 
WWUS51 KLWX 032059
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
459 PM EDT SUN JUL 3 2011

VAC003-032145-
/O.CON.KLWX.SV.W.0252.000000T0000Z-110703T2145Z/
ALBEMARLE VA-
459 PM EDT SUN JUL 3 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR ALBEMARLE COUNTY...

AT 458 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO THE
SIZE OF QUARTERS AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM
WAS LOCATED 9 MILES NORTHEAST OF CHARLOTTESVILLE...MOVING SOUTHEAST
AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  CISMONT...
  KESWICK...
  COBHAM...
  CAMPBELL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WIND GUSTS...LARGE HAIL AND FREQUENT CLOUD
TO GROUND LIGHTNING. MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY
FROM WINDOWS.

&&

LAT...LON 3809 7844 3817 7835 3815 7827 3813 7821
      3811 7821 3801 7830 3799 7832 3799 7833
TIME...MOT...LOC 2059Z 307DEG 13KT 3811 7835

$$

SMZ
507 
WWUS51 KLWX 032107
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
507 PM EDT SUN JUL 3 2011

VAC003-032145-
/O.CON.KLWX.SV.W.0252.000000T0000Z-110703T2145Z/
ALBEMARLE VA-
507 PM EDT SUN JUL 3 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR ALBEMARLE COUNTY...

AT 502 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO THE
SIZE OF QUARTERS AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM
WAS LOCATED 9 MILES NORTHEAST OF CHARLOTTESVILLE...MOVING SOUTHEAST
AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  CISMONT...
  COBHAM...
  CAMPBELL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WIND GUSTS...LARGE HAIL AND FREQUENT CLOUD
TO GROUND LIGHTNING. MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY
FROM WINDOWS.

&&

LAT...LON 3802 7833 3809 7841 3816 7834 3814 7828
      3811 7821 3801 7830 3800 7831
TIME...MOT...LOC 2107Z 307DEG 12KT 3810 7833

$$

SMZ
300 
WWUS51 KLWX 032116
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
516 PM EDT SUN JUL 3 2011

VAC003-032127-
/O.CAN.KLWX.SV.W.0252.000000T0000Z-110703T2145Z/
ALBEMARLE VA-
516 PM EDT SUN JUL 3 2011

...THE SEVERE THUNDERSTORM WARNING IS CANCELLED FOR ALBEMARLE
COUNTY...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS. THUS THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3802 7833 3809 7841 3816 7834 3814 7828
      3811 7821 3801 7830 3800 7831
TIME...MOT...LOC 2117Z 307DEG 12KT 3808 7830

$$

SMZ

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 1:59 AM EDTSmall Craft AdvisoryLWX6 hr
Jul 3, 5:20 AM EDTSpecial Weather StatementLWXArlington, City of Alexandria, City of Falls Church25 min
Jul 3, 3:25 PM EDTSpecial Weather StatementLWXCity of Staunton, City of Waynesboro50 min
Jul 3, 3:33 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Nelson, City of Waynesboro42 min
Jul 3, 3:52 PM EDTSpecial Weather StatementLWXFrederick, City of Winchester38 min
Jul 3, 4:04 PM EDTSpecial Weather StatementLWXGreene41 min
Jul 3, 4:08 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Nelson, City of Waynesboro67 min
Jul 3, 4:34 PM EDTSpecial Weather StatementLWXClarke, Frederick, City of Winchester41 min
Jul 3, 4:40 PM EDTSpecial Weather StatementLWXOrange50 min
Jul 3, 5:21 PM EDTSpecial Weather StatementLWXClarke, Frederick, City of Winchester39 min
Jul 3, 5:23 PM EDTSpecial Weather StatementLWXLoudoun37 min
Jul 3, 5:27 PM EDTSevere Thunderstorm WarningLWXFairfax, Loudoun48 min
Jul 3, 5:38 PM EDTSpecial Marine WarningLWX95 min
Jul 3, 5:54 PM EDTSpecial Weather StatementLWXAugusta, Greene, City of Staunton51 min
Jul 3, 5:58 PM EDTSpecial Marine WarningLWX2 hr
Jul 3, 5:58 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, Loudoun, City of Alexandria, City of Fairfax, City of Falls Church62 min
Jul 3, 6:04 PM EDTSpecial Weather StatementLWXShenandoah41 min
Jul 3, 6:09 PM EDTSpecial Weather StatementLWXClarke51 min
Jul 3, 6:15 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Loudoun, Warren45 min
Jul 3, 6:28 PM EDTSevere Thunderstorm WarningLWXFauquier, Loudoun, Prince William32 min
Jul 3, 6:36 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, City of Alexandria43 min
Jul 3, 6:39 PM EDTSpecial Marine WarningLWX111 min
Jul 3, 6:44 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Loudoun, Rappahannock, Shenandoah, Warren37 min
Jul 3, 6:51 PM EDTSpecial Weather StatementLWXWarren24 min
Jul 3, 6:55 PM EDTSpecial Weather StatementLWXFauquier, Prince William, City of Manassas, City of Manassas Park35 min
Jul 3, 7:00 PM EDTSpecial Weather StatementLWXFairfax, City of Fairfax60 min
Jul 3, 7:08 PM EDTSpecial Weather StatementLWXRappahannock52 min
Jul 3, 7:21 PM EDTSpecial Weather StatementLWXCulpeper, Fairfax, Fauquier, Prince William, Rappahannock, City of Fairfax and 2 more54 min
Jul 3, 7:38 PM EDTSpecial Marine WarningLWX112 min
Jul 3, 7:39 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier, Prince William40 min
Jul 3, 7:43 PM EDTSevere Thunderstorm WarningLWXPrince William, Stafford62 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.