Alert archive / Virginia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 104, NWS Baltimore/Washington

June 25, 2012Albemarle County, Greene County, Orange County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 25, 2012, 1:23 PM EDT for Albemarle County, Greene County, Orange County, Virginia. It was in force for 28 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
Jun 25, 2012, 1:23 PM EDT (17:23 UTC)
Expired
Jun 25, 2012, 1:51 PM EDT
In force
28 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon

Counties Albemarle County, VA, Greene County, VA, Orange County, VA

The radar

The Sterling radar (KLWX), 115 km from the middle of the area, began a volume at 17:24 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.

IssuedProductOfficeLasted
Jun 25, 12:55 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.4 hours before the alert went out and 118 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 2012-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1176 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 2012-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.19395878Sfc1 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
1176 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1268 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.8

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 Jun 25, 1:23 PM EDT, 0 minutes earlier.

Area forecast discussion, Jun 25, 1:23 PM EDT, 0 minutes before
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Hazardous weather outlook, Jun 25, 1:08 PM EDT, 15 minutes before
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In the hours before

Special weather statement, Jun 25, 12:38 PM EDT, 45 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1238 PM EDT MON JUN 25 2012

VAZ056-251715-
SPOTSYLVANIA VA-
1238 PM EDT MON JUN 25 2012

...STRONG THUNDERSTORM TO AFFECT SPOTSYLVANIA COUNTY...

AT 1238 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES SOUTHEAST
OF COOKSTOWN...MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE ALSOP AND MASSAPONAX.

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 WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS. WIND GUSTS OF 40 TO 50
MPH CAN BE EXPECTED.

&&

LAT...LON 3821 7780 3832 7774 3837 7767 3835 7760
      3833 7760 3834 7759 3833 7754 3831 7753
      3832 7752 3830 7745 3825 7741 3825 7737
      3810 7753
TIME...MOT...LOC 1638Z 295DEG 25KT 3826 7765

JE
Special weather statement, Jun 25, 1:11 PM EDT, 12 minutes before
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Local storm report, Jun 25, 1:14 PM EDT, 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 24, 11:21 PM EDTSpecial Weather StatementLWXPage24 min
Jun 24, 11:40 PM EDTSpecial Weather StatementLWXPage35 min
Jun 24, 11:49 PM EDTSpecial Weather StatementLWXRappahannock26 min
Jun 25, 12:06 AM EDTSevere Thunderstorm WarningLWXMadison, Page, Rappahannock28 min
Jun 25, 12:24 AM EDTSpecial Weather StatementLWXFairfax36 min
Jun 25, 12:26 AM EDTSpecial Marine WarningLWX73 min
Jun 25, 12:34 AM EDTSpecial Weather StatementLWXGreene26 min
Jun 25, 4:26 AM EDTSmall Craft AdvisoryLWX40 hr
Jun 25, 12:38 PM EDTSpecial Weather StatementLWXSpotsylvania, City of Fredericksburg37 min
Jun 25, 12:49 PM EDTSevere Thunderstorm WarningLWXAlbemarle, City of Charlottesville26 min
Jun 25, 1:11 PM EDTSpecial Weather StatementLWXOrange34 min
Jun 25, 1:19 PM EDTSpecial Marine WarningLWX40 min
Jun 25, 1:38 PM EDTSpecial Marine WarningLWX32 min
Jun 25, 2:06 PM EDTSpecial Weather StatementLWXSpotsylvania39 min
Jun 25, 2:02 AM EDTSpecial Weather StatementLWXHoward28 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2012Every severe thunderstorm warning in 2012

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.