Alert archive / Virginia / Flood Watches in 2013

Flood Watch 7, NWS Blacksburg, VA

December 22, 201318 counties in Virginia; 9 counties in North Carolina

NWS Blacksburg, VA issued this flood watch at Dec 22, 2013, 3:23 AM EST for 18 counties in Virginia; 9 counties in North Carolina. It took effect at Dec 22, 2013, 12:00 PM EST. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued
Dec 22, 2013, 3:23 AM EST (08:23 UTC)
In effect from
Dec 22, 2013, 12:00 PM EST
Expired
Dec 23, 2013, 12:00 PM EST
In force
24 hr
Issued by
NWS Blacksburg, VA
Flood severity
None
All 27 counties

Alleghany County, NC, Ashe County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Danville, VA, City of Galax, VA, City of Lynchburg, VA, City of Martinsville, VA, Floyd County, VA, Franklin County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Patrick County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 37 km from the middle of the area, began a volume at 08:23 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 00:00Z, 8.4 hours before the alert went out and 333 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 00:00Z on 2013-12-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2013-12-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 334 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
334 m²/s²
0-3 km storm-relative helicity
410 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 21, 9:46 PM ESTWind AdvisoryRNKAlleghany, Amherst, Bath, Bedford, Bland, Botetourt and 12 more14 hr
Dec 22, 7:25 AM ESTSpecial Weather StatementRNKBotetourt65 min
Dec 22, 8:47 AM ESTSpecial Weather StatementRNKAmherst, City of Buena Vista, City of Lynchburg43 min
Dec 22, 3:06 PM ESTSpecial Weather StatementRNKCaswell24 min
Dec 22, 4:45 AM ESTSpecial Weather StatementRNKGreenbrier, Summers60 min

Nearby

Flood Watches in Virginia, 2013Flood Watches in North Carolina, 2013Every flood watch in 2013

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.