Alert archive / Tennessee / Flash Flood Warnings in 2011

Flash Flood Warning 42, NWS Nashville, TN

July 16, 2011Robertson County, Tennessee

NWS Nashville, TN issued this flash flood warning at Jul 16, 2011, 12:35 AM CDT for Robertson 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
Jul 16, 2011, 12:35 AM CDT (05:35 UTC)
Expired
Jul 16, 2011, 3:30 AM CDT
In force
3 hr
Issued by
NWS Nashville, TN
Area
Storm-based polygon
Flood severity
None

County Robertson County, TN

The radar

The Nashville radar (KOHX), 40 km from the middle of the area, began a volume at 05:39 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, 5.6 hours before the alert went out and 51 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 00:00Z on 2011-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1142 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2011-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
1142 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1315 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

479 
WGUS54 KOHX 160535
FFWOHX
TNC147-160830-
/O.NEW.KOHX.FF.W.0042.110716T0535Z-110716T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
1235 AM CDT SAT JUL 16 2011

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ROBERTSON COUNTY IN MIDDLE TENNESSEE...
  THIS INCLUDES THE CITY OF SPRINGFIELD...

* UNTIL 330 AM CDT

* AT 1229 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  VERY HEAVY RAINFALL RESULTING FROM NEARLY STATIONARY THUNDERSTORMS 
  THAT MAY RESULT IN FLASH FLOODING.

* LOCATIONS IN THE WARNING INCLUDE GREENBRIER, CROSS PLAINS, AND     
  ADAMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3665 8657 3643 8675 3639 8692 3646 8712
      3666 8708 3666 8659

$$

ROSE
1 follow-up statement
149 
WGUS74 KOHX 160718
FFSOHX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
218 AM CDT SAT JUL 16 2011

TNC147-160830-
/O.CON.KOHX.FF.W.0042.000000T0000Z-110716T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ROBERTSON TN-
218 AM CDT SAT JUL 16 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR ROBERTSON COUNTY UNTIL
330 AM CDT...

AS OF 217 AM CDT...EARLIER HEAVY RAINFALL HAD WEAKENED CONSIDERABLY 
AND MOVED OUT OF THE WARNED AREA. STILL, RUNOFF FROM TONIGHT'S 
EXCESSIVE RAINFALL MAY CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS 
THAT COULD EXPERIENCE FLASH FLOODING INCLUDE SPRINGFIELD, CROSS 
PLAINS, ADAMS, AND GREENBRIER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3665 8657 3643 8675 3639 8692 3646 8712
      3666 8708 3666 8659

$$

ROSE

Nearby

Flash Flood Warnings in Tennessee, 2011Every flash flood warning 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.