Alert archive / Virginia / Red Flag Warnings in 2010

Red Flag Warning 5, NWS Blacksburg, VA

October 21, 2010Bath County, Virginia

NWS Blacksburg, VA issued this red flag warning at Oct 21, 2010, 10:15 AM EDT for Bath County, Virginia. It took effect at Oct 21, 2010, 12:00 PM EDT. It was in force for 7 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: Oct 21, 2010, 10:15 AM EDT (14:15 UTC)
In effect from: Oct 21, 2010, 12:00 PM EDT
Expired: Oct 21, 2010, 6:57 PM EDT
In force: 7 hr
Issued by: NWS Blacksburg, VA

County Bath County, VA

The radar

The Roanoke radar (KFCX), 124 km from the middle of the area, began a volume at 14:14 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, 2.3 hours before the alert went out and 98 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: 1448 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 255 m²/s²
0-3 km storm-relative helicity: 307 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 red flag 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 red flag warning went out at Oct 20, 7:44 PM EDT, 14 hours 31 minutes earlier.

Area forecast discussion, Oct 20, 7:44 PM EDT, 14 hours 31 minutes before

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Hazardous weather outlook, Oct 20, 3:47 PM EDT, 18 hours 28 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
Oct 21, 1:33 AM EDT	Dense Fog Advisory	RNK	Amherst, Appomattox, Bedford, Buckingham, Campbell, Charlotte and 7 more	5 hr
Oct 21, 4:04 PM EDT	Frost Advisory	RNK	Alleghany, Smyth, Tazewell, City of Covington	17 hr
Oct 21, 4:04 PM EDT	Freeze Warning	RNK	Bath	17 hr

Nearby

Red Flag Warnings in Virginia, 2010 Every red flag 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.