Alert archive / Tennessee / Flash Flood Warnings in 2012

Flash Flood Warning 39, NWS Memphis, TN

July 18, 2012Henry County, Tennessee

NWS Memphis, TN issued this flash flood warning at Jul 18, 2012, 6:09 PM CDT for Henry 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 18, 2012, 6:09 PM CDT (23:09 UTC)
Expired: Jul 18, 2012, 9:15 PM CDT
In force: 3 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

County Henry County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.2 hours before the alert went out and 142 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: 2917 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 63 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.

558 
WGUS54 KMEG 182309
FFWMEG
TNC079-190215-
/O.NEW.KMEG.FF.W.0039.120718T2309Z-120719T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
609 PM CDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN HENRY COUNTY IN NORTHWEST TENNESSEE...

* UNTIL 915 PM CDT

* AT 610 PM CDT...DOPPLER RADAR ESTIMATES 1 TO 3 INCHES OF RAINFALL
  HAS OCCURRED OVER THE PAST HOUR. SHOWERS AND THUNDERSTORMS WILL
  PRODUCE AN ADDITIONAL 1 TO 3 INCHES OF RAIN OVER THE NEXT HOUR.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PARIS
  LANDING STATE PARK.

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. MOVE TO HIGHER GROUND.

.STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT FLASH FLOODING ONLY...CALL 1 800 4 3 2 0 8 7 5.

&&

LAT...LON 3635 8809 3630 8809 3631 8841 3650 8840
      3651 8837 3650 8805 3647 8804 3644 8805
      3638 8800 3635 8799

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 3:27 AM CDT	Heat Advisory	MEG	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	3 days
Jul 18, 4:37 PM CDT	Special Weather Statement	MEG	Hardin	23 min
Jul 18, 4:43 PM CDT	Severe Thunderstorm Warning	MEG	Hardin	29 min
Jul 18, 5:03 PM CDT	Flash Flood Warning	MEG	Hardin	3 hr
Jul 18, 6:02 PM CDT	Flash Flood Warning	MEG	Decatur, Hardin, Henderson	3 hr
Jul 18, 6:48 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Decatur, Henderson	42 min
Jul 18, 6:51 PM CDT	Severe Thunderstorm Warning	MEG	Henry	22 min

Nearby

Flash Flood Warnings in Tennessee, 2012 Every 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.