Alert archive / Tennessee / Flood Watches in 2011

Flood Watch 4, NWS Morristown, TN

November 27, 201121 counties in Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this flood watch at Nov 27, 2011, 4:26 AM EST for 21 counties in Tennessee; Cherokee County, Clay County, North Carolina. It took effect at Nov 27, 2011, 5:00 PM EST. It was in force for 29 hr.

The area

The counties it named.

The facts

Issued: Nov 27, 2011, 4:26 AM EST (09:26 UTC)
In effect from: Nov 27, 2011, 5:00 PM EST
Expired: Nov 28, 2011, 10:28 PM EST
In force: 29 hr
Issued by: NWS Morristown, TN
Flood severity: None

All 23 counties

Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cocke County, TN, Hamilton County, TN, Jefferson 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

The radar

The Knoxville radar (KMRX), 108 km from the middle of the area, began a volume at 09:30 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

Nashville Metro, TN (KBNA), launched 00:00Z, 9.4 hours before the alert went out and 204 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: 1650 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 188 m²/s²
0-3 km storm-relative helicity: 225 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 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 flood watch went out at Nov 27, 12:26 AM EST, 4 hours earlier.

Area forecast discussion, Nov 27, 12:26 AM EST, 4 hours before

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Hazardous weather outlook, Nov 26, 12:04 PM EST, 16 hours 22 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
Nov 27, 9:26 AM EST	River Flood Warning	MRX	Cocke	54 hr
Nov 27, 9:30 AM EST	Wind Advisory	MRX	Blount, Carter, Cocke, Greene, Johnson, McMinn and 4 more	43 hr
Nov 27, 9:55 AM EST	River Flood Warning	MRX	Sevier	35 hr
Nov 27, 3:23 PM EST	High Wind Watch	MRX	Cocke	13 hr

Nearby

Flood Watches in Tennessee, 2011 Flood Watches in North Carolina, 2011 Every flood watch in 2011

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.