Alert archive / Tennessee / Flash Flood Watches in 2009

Flash Flood Watch 3, NWS Morristown, TN

September 25, 200933 counties in Tennessee; 7 counties in Virginia; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this flash flood watch at Sep 25, 2009, 5:24 AM EDT for 33 counties in Tennessee; 7 counties in Virginia; Cherokee County, Clay County, North Carolina. It took effect at Sep 25, 2009, 12:00 PM EDT. It was in force for 34 hr.

The area

The counties it named.

The facts

Issued: Sep 25, 2009, 5:24 AM EDT (09:24 UTC)
In effect from: Sep 25, 2009, 12:00 PM EDT
Expired: Sep 26, 2009, 9:45 PM EDT
In force: 34 hr
Issued by: NWS Morristown, TN
Flood severity: None

All 42 counties

Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 27 km from the middle of the area, began a volume at 09:27 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 9.4 hours before the alert went out and 306 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: 1290 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 894 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 4 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 flash flood watch 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 watch went out at Sep 25, 3:42 AM EDT, 1 hour 42 minutes earlier.

Area forecast discussion, Sep 25, 3:42 AM EDT, 1 hour 42 minutes before

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In the hours before

Local storm report, Sep 24, 11:36 PM EDT, 5 hours 48 minutes before

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Local storm report, Sep 25, 12:11 AM EDT, 5 hours 13 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
Sep 24, 9:04 PM EDT	Areal Flood Advisory	MRX	Sullivan	116 min
Sep 24, 10:47 PM EDT	Flash Flood Warning	MRX	Sullivan	2 hr
Sep 24, 11:18 PM EDT	Areal Flood Advisory	MRX	Sullivan	117 min
Sep 25, 1:57 PM EDT	Areal Flood Advisory	MRX	Morgan	3 hr
Sep 25, 3:04 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Rhea	3 hr
Sep 25, 3:27 PM EDT	Areal Flood Advisory	MRX	Campbell, Scott	3 hr
Sep 25, 4:24 PM EDT	Areal Flood Advisory	MRX	Campbell, Morgan, Scott	111 min
Sep 25, 4:50 PM EDT	Flash Flood Warning	MRX	Morgan, Scott	3 hr
Sep 25, 5:03 PM EDT	Areal Flood Advisory	MRX	Hamilton	117 min
Sep 25, 5:08 PM EDT	Areal Flood Advisory	MRX	Hancock, Hawkins	112 min
Sep 25, 5:38 PM EDT	Flash Flood Warning	MRX	Hancock, Hawkins, Sullivan	3 hr
Sep 25, 5:44 PM EDT	Flash Flood Warning	MRX	Hamilton	3 hr
Sep 25, 5:46 PM EDT	Flash Flood Warning	MRX	Hancock, Hawkins, Sullivan	3 hr
Sep 25, 6:06 PM EDT	Flash Flood Warning	MRX	Hamilton	70 min
Sep 25, 3:30 PM EDT	Areal Flood Advisory	MRX	Lee, Wise	3 hr

Nearby

Flash Flood Watches in Tennessee, 2009 Flash Flood Watches in Virginia, 2009 Flash Flood Watches in North Carolina, 2009 Every flash flood watch 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.