Alert archive / Tennessee / Flash Flood Warnings in 2009

Flash Flood Warning 21, NWS Memphis, TN

May 1, 2009Decatur County, Tennessee

NWS Memphis, TN issued this flash flood warning at May 1, 2009, 3:11 PM CDT for Decatur County, Tennessee. It was in force for 2 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 1, 2009, 3:11 PM CDT (20:11 UTC)
Expired: May 1, 2009, 5:15 PM CDT
In force: 2 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

County Decatur County, TN

What was reported inside it

Time	Report	Where	Remark
May 1, 5:10 PM CDT	FLASH FLOOD	12 Nne Parsons, TN	FLOODING ON HOG CREEK DRIVE IN COMMUNITY OF SUGAR TREE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.2 hours before the alert went out and 147 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: 470 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMEG 012012
FFWMEG
TNC039-012215-
/O.NEW.KMEG.FF.W.0021.090501T2012Z-090501T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
311 PM CDT FRI MAY 1 2009

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DECATUR COUNTY IN TENNESSEE...

* UNTIL 515 PM CDT

* AT 311 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN OVER PARTS OF THE WARNED AREA. OVER THE PAST 3     
  HOURS DOPPLER RADAR ESTIMATES THAT 2 TO 4 INCHES OF RAINFALL HAS   
  FALLEN ACROSS PARTS OF THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PARSONS.

THIS WARNING INCLUDES THE FOLLOWING LOW WATER CROSSINGS IN DECATUR
COUNTY BIBLE HILL ROAD AT SHIPMAN CREEK...BIBLE HILL ROAD IN
PARSONS...BOHANNON LD ROAD AT RICKETTS CREEK...CONCORD ROAD AT LESTER
CREEK...FAIRGROUND ROAD...HAYNES ROAD AT HOG CREEK...HOG CREEK ROAD
AT MILLS BRANCH...LARGE ROAD AT RUSSIAN CREEK...LARGO ROAD 4...
NORTHWOOD STREET IN PARSONS...OAK PARK ROAD AT CHEROKEE HEIGHTS
ROAD...OLD LEXINGTON ROAD AT BEAR CREEK AND W O BAKER ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

.ADDITIONAL RAINFALL AMOUNTS OF 1 INCH ARE POSSIBLE IN THE WARNED 
AREA.

.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 TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

.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 3540 8799 3540 8804 3542 8806 3540 8809
      3543 8824 3553 8823 3561 8819 3586 8817
      3582 8798 3576 8798 3573 8802 3561 8802
      3557 8799 3547 8799 3547 8802 3544 8804
      3543 8799

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 8:09 PM CDT	Areal Flood Advisory	MEG	Henry, Weakley	3 hr
May 1, 8:31 AM CDT	Flash Flood Warning	MEG	Obion, Weakley	119 min
May 1, 10:27 AM CDT	Flash Flood Warning	MEG	Dyer, Gibson, Lake, Obion, Weakley	2 hr
May 1, 12:26 PM CDT	Flash Flood Warning	MEG	Carroll, Dyer, Gibson, Henry, Lake, Obion and 1 more	2 hr
May 1, 1:16 PM CDT	Flash Flood Warning	MEG	Decatur	119 min
May 1, 2:24 PM CDT	Flash Flood Warning	MEG	Carroll, Dyer, Gibson, Henderson, Henry, Lake and 2 more	3 hr
May 1, 3:08 PM CDT	Severe Thunderstorm Warning	MEG	Hardin	19 min
May 1, 3:40 PM CDT	Flash Flood Watch	MEG	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	55 hr
May 1, 5:18 PM CDT	Flash Flood Warning	MEG	Decatur	3 hr
May 1, 5:23 PM CDT	Flash Flood Warning	MEG	Carroll, Dyer, Gibson, Henderson, Henry, Lake and 2 more	3 hr
May 1, 5:50 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Hardeman	40 min
May 1, 6:02 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Hardeman, McNairy	23 min
May 1, 6:27 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Hardeman	48 min
May 1, 6:48 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Hardin, McNairy	42 min

Nearby

Flash Flood Warnings in Tennessee, 2009 Every flash flood warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.