Alert archive / Virginia / Areal Flood Warnings in 2009

Areal Flood Warning 13, NWS Blacksburg, VA

December 9, 20098 counties in Virginia

NWS Blacksburg, VA issued this areal flood warning at Dec 9, 2009, 4:32 AM EST for 8 counties in Virginia. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 9, 2009, 4:32 AM EST (09:32 UTC)
Expired: Dec 9, 2009, 1:30 PM EST
In force: 9 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Carroll County, VA, City of Galax, VA, City of Radford, VA, Floyd County, VA, Grayson County, VA, Montgomery County, VA, Pulaski County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 44 km from the middle of the area, began a volume at 09:31 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 9.5 hours before the alert went out and 119 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 604 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 504 m²/s²
0-3 km storm-relative helicity: 896 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Blacksburg, VA wrote its last area forecast discussion before this areal flood warning went out at Dec 9, 3:37 AM EST, 55 minutes earlier.

Area forecast discussion, Dec 9, 3:37 AM EST, 55 minutes before

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Hazardous weather outlook, Dec 9, 4:05 AM EST, 27 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 9, 2:58 AM EST	Flood Watch	RNK	Bland, Giles, Grayson, Montgomery, Pulaski, Smyth and 3 more	5 hr
Dec 9, 2:59 AM EST	Ice Storm Warning	RNK	Bath	4 hr
Dec 9, 4:40 AM EST	Areal Flood Warning	RNK	Alleghany, Amherst, Bath, Rockbridge, City of Buena Vista, City of Lexington	10 hr
Dec 9, 5:13 AM EST	Areal Flood Warning	RNK	Smyth, Wythe	6 hr
Dec 9, 6:46 AM EST	Areal Flood Warning	RNK	Botetourt, Roanoke, City of Roanoke, City of Salem	12 hr
Dec 9, 11:20 AM EST	River Flood Warning	RNK	Halifax	47 hr
Dec 9, 1:40 PM EST	Areal Flood Warning	RNK	Montgomery	4 hr
Dec 9, 2:40 PM EST	Areal Flood Warning	RNK	Rockbridge, City of Buena Vista, City of Lexington	3 hr
Dec 9, 3:15 PM EST	River Flood Warning	RNK	Buckingham, Fluvanna	45 hr
Dec 9, 3:15 PM EST	River Flood Warning	RNK	Charlotte, Halifax	49 hr
Dec 9, 4:36 AM EST	Areal Flood Warning	RNK	Greenbrier	6 hr
Dec 9, 11:27 AM EST	River Flood Warning	RNK	Greenbrier, Monroe, Summers	23 hr

Nearby

Areal Flood Warnings in Virginia, 2009 Every areal flood warning in 2009

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.