Alert archive / Arkansas / Flash Flood Warnings in 2011

Flash Flood Warning 18, NWS Memphis, TN

February 24, 20114 counties in Arkansas

NWS Memphis, TN issued this flash flood warning at Feb 24, 2011, 5:47 PM CST for 4 counties in Arkansas. 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: Feb 24, 2011, 5:47 PM CST (23:47 UTC)
Expired: Feb 24, 2011, 8:45 PM CST
In force: 3 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Crittenden County, AR, Cross County, AR, Lee County, AR, St. Francis County, AR

The radar

The Memphis radar (KNQA), 83 km from the middle of the area, began a volume at 23:50 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

Little Rock, AR (KLZK), launched 12:00Z, 11.8 hours before the alert went out and 67 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: 10 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 466 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

795 
WGUS54 KMEG 242347
FFWMEG
ARC035-037-077-123-250245-
/O.NEW.KMEG.FF.W.0018.110224T2347Z-110225T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
547 PM CST THU FEB 24 2011

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CRITTENDEN COUNTY IN EASTERN ARKANSAS...
  CROSS COUNTY IN EASTERN ARKANSAS...
  LEE COUNTY IN EASTERN ARKANSAS...
  ST. FRANCIS COUNTY IN EASTERN ARKANSAS...

* UNTIL 845 PM CST

* AT 544 PM CST...DOPPLER RADAR ESTIMATES 1 INCH OF RAINFALL HAS 
OCCURRED OVER THE PAST 6 HOURS. SHOWERS AND THUNDERSTORMS WILL   
PRODUCE AN ADDITIONAL 1 TO 3 INCHES OF RAIN OVER THE NEXT 3 HOURS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO EARLE...
  FORREST CITY...HUGHES...MADISON...MARIANNA...MARION...PALESTINE...
  PARKIN...WYNNE AND VILLAGE CREEK STATE PARK.

CROWLEYS RIDGE WILL HAVE SIGNIFICANT FLOODING OF LOW WATER 
CROSSINGS. FLASH FLOODING IN THE STREETS OF WEST MEMPHIS AND MARION 
WILL BE A PROBLEM THIS EVENING.

 THIS WARNING ALSO INCLUDES AREAS NEAR HORSESHOE LAKE...MIDWAY LAKE
  AND WAPANOCCA LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

.MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE
INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE
USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING
FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

.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 3501 9113 3501 9105 3544 9104 3544 9017
      3535 9019 3520 9014 3508 9023 3508 9027
      3503 9031 3490 9029 3488 9036 3489 9047
      3483 9050 3480 9055 3465 9059 3465 9106
      3473 9106 3474 9111 3487 9110 3492 9114

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 2:48 AM CST	Flash Flood Warning	MEG	Clay, Greene, Lawrence, Randolph	3 hr
Feb 24, 5:45 AM CST	Flash Flood Warning	MEG	Clay, Greene, Lawrence, Randolph	3 hr
Feb 24, 8:47 AM CST	Flash Flood Warning	MEG	Clay, Greene, Lawrence, Randolph	3 hr
Feb 24, 11:28 AM CST	River Flood Advisory	MEG	Mississippi	35 hr
Feb 24, 11:45 AM CST	Flash Flood Warning	MEG	Clay, Greene, Lawrence, Randolph	3 hr
Feb 24, 1:08 PM CST	River Flood Warning	MEG	Mississippi, Poinsett	54 hr
Feb 24, 2:44 PM CST	Flash Flood Warning	MEG	Clay, Craighead, Greene, Lawrence, Mississippi, Randolph	6 hr
Feb 24, 4:59 PM CST	Tornado Warning	MEG	Clay, Greene	46 min
Feb 24, 5:04 PM CST	Flash Flood Warning	MEG	Craighead, Mississippi, Poinsett	4 hr
Feb 24, 5:11 PM CST	Tornado Warning	MEG	Clay	49 min
Feb 24, 5:17 PM CST	Flash Flood Warning	MEG	Mississippi	5 hr
Feb 24, 5:40 PM CST	Severe Thunderstorm Warning	MEG	Clay, Craighead, Cross, Greene, Lawrence, Poinsett	50 min
Feb 24, 5:43 PM CST	Severe Thunderstorm Warning	MEG	Crittenden, Cross, Lee, Poinsett, St. Francis	47 min

Nearby

Flash Flood Warnings in Arkansas, 2011 Every 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.