Alert archive / Tennessee / Flash Flood Warnings in 2012

Flash Flood Warning 19, NWS Nashville, TN

August 9, 2012Cumberland County, Tennessee

NWS Nashville, TN issued this flash flood warning at Aug 9, 2012, 12:23 PM CDT for Cumberland County, Tennessee. It was in force for 3 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, 12:23 PM CDT (17:23 UTC)
Expired
Aug 9, 2012, 3:30 PM CDT
In force
3 hr
Issued by
NWS Nashville, TN
Area
Storm-based polygon
Flood severity
None

County Cumberland County, TN

The radar

The Nashville radar (KOHX), 139 km from the middle of the area, began a volume at 17:27 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

Nashville Metro, TN (KBNA), launched 12:00Z, 5.4 hours before the alert went out and 140 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.

213 
WGUS54 KOHX 091723
FFWOHX
TNC035-092030-
/O.NEW.KOHX.FF.W.0019.120809T1723Z-120809T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
1223 PM CDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

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

* UNTIL 330 PM CDT

* AT 1222 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  A LINE OF THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING ACROSS THE 
  WARNED AREA. RADAR ESTIMATES INDICATE SEVERAL LOCATIONS RECEIVING  
  IN EXCESS OF 2 INCHES OF RAIN PER HOUR.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CROSSVILLE AND FAIRFIELD GLADE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 3582 8478 3576 8491 3575 8500 3577 8511
      3576 8525 3579 8525 3579 8527 3582 8524
      3589 8523 3590 8522 3592 8525 3596 8527
      3610 8524 3610 8515 3613 8513 3615 8488
      3600 8472 3591 8467

$$

ROSE
1 follow-up statement
398 
WGUS74 KOHX 092021
FFSOHX

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

TNC035-092037-
/O.EXP.KOHX.FF.W.0019.000000T0000Z-120809T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CUMBERLAND TN-
321 PM CDT THU AUG 9 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CUMBERLAND COUNTY
WILL BE ALLOWED TO EXPIRE AT 330 PM CDT...

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 3582 8478 3576 8491 3575 8500 3577 8511
      3576 8525 3579 8525 3579 8527 3582 8524
      3589 8523 3590 8522 3592 8525 3596 8527
      3610 8524 3610 8515 3613 8513 3615 8488
      3600 8472 3591 8467

$$

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, 11:48 AM CDTFlash Flood WarningOHXCoffee2 hr
Aug 9, 11:56 AM CDTFlash Flood WarningOHXPutnam, Van Buren, White3 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.