Alert archive / Virginia / Flash Flood Warnings in 2010

Flash Flood Warning 32, NWS Baltimore/Washington

August 5, 20107 counties in Virginia

NWS Baltimore/Washington issued this flash flood warning at Aug 5, 2010, 4:54 PM EDT for 7 counties in Virginia. It was in force for 105 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
Aug 5, 2010, 4:54 PM EDT (20:54 UTC)
Expired
Aug 5, 2010, 6:39 PM EDT
In force
105 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
None

Counties City of Fairfax, VA, City of Manassas, VA, City of Manassas Park, VA, Fairfax County, VA, Fauquier County, VA, Loudoun County, VA, Prince William County, VA

The radar

The Sterling radar (KLWX), 17 km from the middle of the area, began a volume at 20:57 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.9 hours before the alert went out and 16 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 2010-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 158 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 2010-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 square meters per square second.193958Sfc1 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
158 J/kg
Mixed-layer CIN
-267 J/kg
Mixed-layer LCL
1352 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 8:31 PM EDTSpecial Weather StatementLWXAlbemarle29 min
Aug 4, 8:43 PM EDTSpecial Marine WarningLWX63 min
Aug 4, 8:47 PM EDTSpecial Marine WarningLWX107 min
Aug 5, 1:59 AM EDTSmall Craft AdvisoryLWX4 hr
Aug 5, 1:15 PM EDTSpecial Weather StatementLWXAugusta30 min
Aug 5, 1:38 PM EDTSpecial Weather StatementLWXAugusta, City of Staunton37 min
Aug 5, 1:48 PM EDTSpecial Weather StatementLWXClarke27 min
Aug 5, 2:11 PM EDTSpecial Weather StatementLWXPage, Rappahannock34 min
Aug 5, 2:18 PM EDTSpecial Weather StatementLWXGreene27 min
Aug 5, 2:20 PM EDTSpecial Weather StatementLWXLoudoun25 min
Aug 5, 2:25 PM EDTSevere Thunderstorm WarningLWXCulpeper, Madison, Page, Rappahannock50 min
Aug 5, 2:26 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Loudoun, Prince William, Warren49 min
Aug 5, 2:28 PM EDTSevere Thunderstorm WarningLWXGreene, Madison, Orange, Page, Rockingham, City of Harrisonburg34 min
Aug 5, 2:51 PM EDTSpecial Marine WarningLWX54 min
Aug 5, 3:01 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, Fauquier, Loudoun, Prince William, City of Alexandria and 4 more44 min
Aug 5, 3:09 PM EDTSpecial Weather StatementLWXCulpeper36 min
Aug 5, 3:11 PM EDTSpecial Weather StatementLWXHighland34 min
Aug 5, 3:15 PM EDTSpecial Marine WarningLWX2 hr
Aug 5, 3:20 PM EDTSevere Thunderstorm WarningLWXAugusta, Highland, Rockingham, Shenandoah, City of Harrisonburg, City of Staunton55 min
Aug 5, 3:24 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier, Orange, Prince William, Spotsylvania, Stafford and 1 more51 min
Aug 5, 3:40 PM EDTSpecial Marine WarningLWX35 min
Aug 5, 3:42 PM EDTSpecial Weather StatementLWXPrince William33 min
Aug 5, 3:45 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, City of Alexandria60 min
Aug 5, 3:51 PM EDTSpecial Marine WarningLWX114 min
Aug 5, 3:53 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, Fauquier, Loudoun, Prince William, City of Alexandria and 4 more52 min
Aug 5, 4:01 PM EDTSpecial Weather StatementLWXNelson29 min
Aug 5, 4:07 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Nelson40 min
Aug 5, 4:11 PM EDTSpecial Marine WarningLWX94 min
Aug 5, 4:15 PM EDTSevere Thunderstorm WarningLWXKing George, Orange, Spotsylvania, Stafford, City of Fredericksburg55 min
Aug 5, 4:16 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Greene, Madison, Nelson, Orange and 7 more59 min
Aug 5, 4:24 PM EDTSpecial Weather StatementLWXFauquier36 min
Aug 5, 4:26 PM EDTSpecial Weather StatementLWXShenandoah34 min
Aug 5, 4:29 PM EDTSevere Thunderstorm WarningLWXFauquier, Loudoun, Prince William, Rappahannock, Warren46 min
Aug 5, 4:32 PM EDTSpecial Marine WarningLWX65 min
Aug 5, 4:57 PM EDTSpecial Weather StatementLWXArlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church, City of Manassas and 1 more33 min
Aug 5, 5:06 PM EDTSpecial Weather StatementLWXPage, Shenandoah39 min
Aug 5, 5:15 PM EDTSpecial Marine WarningLWX90 min
Aug 5, 5:16 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Culpeper, Greene, Madison, Nelson, Orange and 1 more50 min
Aug 5, 5:19 PM EDTSpecial Weather StatementLWXFairfax, Prince William, City of Fairfax, City of Manassas, City of Manassas Park41 min
Aug 5, 5:29 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, Loudoun, Prince William46 min
Aug 5, 5:31 PM EDTSpecial Marine WarningLWX119 min
Aug 5, 5:37 PM EDTSpecial Weather StatementLWXPrince William, City of Manassas, City of Manassas Park38 min
Aug 5, 5:41 PM EDTSpecial Marine WarningLWX94 min
Aug 5, 5:59 PM EDTSpecial Marine WarningLWX59 min
Aug 5, 6:02 PM EDTSpecial Weather StatementLWXSpotsylvania43 min
Aug 5, 6:08 PM EDTSpecial Weather StatementLWXCulpeper37 min
Aug 5, 6:18 PM EDTSpecial Weather StatementLWXCity of Falls Church27 min
Aug 5, 6:36 PM EDTSpecial Weather StatementLWXKing George, Stafford, City of Fredericksburg39 min
Aug 5, 6:48 PM EDTSpecial Marine WarningLWX87 min
Aug 5, 7:16 PM EDTSpecial Weather StatementLWXKing George24 min
Aug 5, 7:30 PM EDTSpecial Marine WarningLWX90 min
Aug 4, 8:00 PM EDTSevere Thunderstorm WarningLWXCarroll, Frederick45 min
Aug 4, 8:35 PM EDTSpecial Weather StatementLWXBaltimore, Howard, City of Baltimore40 min
Aug 4, 8:46 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll, Harford59 min
Aug 4, 8:50 PM EDTSpecial Weather StatementLWXBaltimore, City of Baltimore55 min
Aug 4, 9:32 PM EDTSpecial Weather StatementLWXHarford43 min
Aug 5, 4:18 PM EDTTornado WarningLWXAnne Arundel, Calvert, Prince George's21 min
Aug 5, 5:22 PM EDTSevere Thunderstorm WarningLWXCalvert, Charles, Saint Mary's53 min
Aug 5, 5:59 PM EDTSpecial Weather StatementLWXPrince George's31 min
Aug 5, 6:19 PM EDTSpecial Weather StatementLWXCalvert, Charles26 min
Aug 5, 7:57 PM EDTSpecial Weather StatementLWXSaint Mary's33 min

Nearby

Flash Flood Warnings in Virginia, 2010Every flash flood warning in 2010

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.