Alert archive / Virginia / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 210, NWS Baltimore/Washington

August 11, 2015Albemarle County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 11, 2015, 7:59 PM EDT for Albemarle County, Virginia. It was in force for 31 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 11, 2015, 7:59 PM EDT (23:59 UTC)
Expired
Aug 11, 2015, 8:30 PM EDT
In force
31 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon

County Albemarle County, VA

The radar

The Sterling radar (KLWX), 141 km from the middle of the area, began a volume at 00:03 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 nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 12.0 hours before the alert went out and 124 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, Roanoke, VA at 12:00Z on 2015-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 153 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, Roanoke, VA at 12:00Z on 2015-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
153 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
656 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 2:04 PM EDTSpecial Marine WarningLWX116 min
Aug 11, 2:51 PM EDTSpecial Marine WarningLWX39 min
Aug 11, 3:38 PM EDTSpecial Marine WarningLWX97 min
Aug 11, 4:29 PM EDTSpecial Marine WarningLWX91 min
Aug 11, 5:51 PM EDTSpecial Marine WarningLWX84 min
Aug 11, 7:18 PM EDTSpecial Marine WarningLWX87 min
Aug 11, 3:19 AM EDTCoastal Flood AdvisoryLWXCalvert, Saint Mary's13 hr
Aug 11, 4:10 PM EDTCoastal Flood AdvisoryLWXSaint Mary's10 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 2015Every severe thunderstorm warning in 2015

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.