Alert archive / Tennessee / Flash Flood Warnings in 2012

Flash Flood Warning 17, NWS Nashville, TN

August 9, 2012Coffee County, Tennessee

NWS Nashville, TN issued this flash flood warning at Aug 9, 2012, 11:48 AM CDT for Coffee County, Tennessee. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 9, 2012, 11:48 AM CDT (16:48 UTC)
Expired
Aug 9, 2012, 2:17 PM CDT
In force
2 hr
Issued by
NWS Nashville, TN
Area
Storm-based polygon
Flood severity
None

County Coffee County, TN

The radar

The Northeast Alabama radar (KHTX), 53 km from the middle of the area, began a volume at 16:51 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 12:00Z, 4.8 hours before the alert went out and 90 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2012-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2387 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2012-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2387 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
14 m²/s²
Significant tornado parameter
0.2
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

354 
WGUS54 KOHX 091648
FFWOHX
TNC031-092000-
/O.NEW.KOHX.FF.W.0017.120809T1648Z-120809T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
1148 AM CDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COFFEE COUNTY IN MIDDLE TENNESSEE...

* UNTIL 300 PM CDT

* AT 1145 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  A SERIES OF STRONG THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS   
  THE WARNED AREA. RADAR ESTIMATES INDICATE THAT SOME AREAS ARE      
  RECEIVING IN EXCESS OF 2 INCHES OF RAINFALL PER HOUR.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MANCHESTER AND TULLAHOMA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. TURN
AROUND... DONT DROWN.

&&

LAT...LON 3535 8627 3535 8625 3536 8626 3541 8626
      3545 8624 3546 8625 3554 8624 3560 8595
      3552 8588 3536 8588 3534 8603 3536 8615
      3533 8620 3534 8623 3533 8626

$$

ROSE
1 follow-up statement
820 
WGUS74 KOHX 091917
FFSOHX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
217 PM CDT THU AUG 9 2012

TNC031-091932-
/O.CAN.KOHX.FF.W.0017.000000T0000Z-120809T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COFFEE TN-
217 PM CDT THU AUG 9 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR COFFEE COUNTY IS
CANCELED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3535 8627 3535 8625 3536 8626 3541 8626
      3545 8624 3546 8625 3554 8624 3560 8595
      3552 8588 3536 8588 3534 8603 3536 8615
      3533 8620 3534 8623 3533 8626

$$

ROSE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 7:34 AM CDTSpecial Weather StatementOHXSumner26 min
Aug 9, 8:29 AM CDTAreal Flood AdvisoryOHXRobertson, Sumner3 hr
Aug 9, 9:12 AM CDTSevere Thunderstorm WarningOHXDavidson, Rutherford, Wilson33 min
Aug 9, 9:19 AM CDTSpecial Weather StatementOHXRobertson, Sumner86 min
Aug 9, 9:45 AM CDTSevere Thunderstorm WarningOHXSumner, Wilson15 min
Aug 9, 9:58 AM CDTSevere Thunderstorm WarningOHXMacon, Sumner, Trousdale, Wilson17 min
Aug 9, 10:13 AM CDTSevere Thunderstorm WarningOHXMacon, Sumner, Trousdale17 min
Aug 9, 11:29 AM CDTSpecial Weather StatementOHXPutnam, Van Buren, White61 min
Aug 9, 11:34 AM CDTSevere Thunderstorm WarningOHXCumberland, Putnam, White26 min
Aug 9, 11:38 AM CDTSpecial Weather StatementOHXCoffee37 min
Aug 9, 11:56 AM CDTFlash Flood WarningOHXPutnam, Van Buren, White3 hr
Aug 9, 12:23 PM CDTFlash Flood WarningOHXCumberland3 hr

Nearby

Flash Flood Warnings in Tennessee, 2012Every flash flood warning in 2012

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.