Alert archive / Virginia / Flash Flood Warnings in 2009

Flash Flood Warning 25, NWS Morristown, TN

August 22, 2009Sullivan County, Tennessee; Washington County, City of Bristol, Virginia

NWS Morristown, TN issued this flash flood warning at Aug 22, 2009, 4:40 AM EDT for Sullivan County, Tennessee; Washington County, City of Bristol, Virginia. It was in force for 110 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 22, 2009, 4:40 AM EDT (08:40 UTC)
Expired: Aug 22, 2009, 6:30 AM EDT
In force: 110 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Sullivan County, TN, City of Bristol, VA, Washington County, VA

The radar

The Knoxville radar (KMRX), 122 km from the middle of the area, began a volume at 08:43 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 00:00Z, 8.7 hours before the alert went out and 245 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: 221 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Morristown, TN wrote its last area forecast discussion before this flash flood warning went out at Aug 22, 3:20 AM EDT, 1 hour 20 minutes earlier.

Area forecast discussion, Aug 22, 3:20 AM EDT, 1 hour 20 minutes before

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Hazardous weather outlook, Aug 22, 4:26 AM EDT, 14 minutes before

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In the hours before

Special weather statement, Aug 21, 11:31 PM EDT, 5 hours 9 minutes before

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Special weather statement, Aug 22, 2:51 AM EDT, 1 hour 49 minutes before

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Special weather statement, Aug 22, 2:55 AM EDT, 1 hour 45 minutes before

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The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 2:10 AM EDT	Areal Flood Advisory	MRX	Blount, Cocke, Hamblen, Jefferson, Knox, Sevier	110 min
Aug 22, 4:05 AM EDT	Areal Flood Advisory	MRX	Carter, Greene, Hawkins, Johnson, Sullivan, Washington	115 min

Nearby

Flash Flood Warnings in Virginia, 2009 Flash Flood Warnings in Tennessee, 2009 Every flash 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.