Alert archive / Arkansas / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Shreveport, LA

April 21, 20117 counties in Arkansas

NWS Shreveport, LA issued this flash flood warning at Apr 21, 2011, 7:16 AM CDT for 7 counties in Arkansas. It was in force for 4 hr. 2 reports 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: Apr 21, 2011, 7:16 AM CDT (12:16 UTC)
Expired: Apr 21, 2011, 11:15 AM CDT
In force: 4 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR

The radar

The Shreveport radar (KSHV), 126 km from the middle of the area, began a volume at 12:19 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.

What was reported inside it

Time	Report	Where	Remark
Apr 21, 8:30 AM CDT	FLASH FLOOD	5 Ene Mcnab, AR	WATER COMPROMISING BRIDGE ON HWY 195 S BETWEEN FULTON AND CROSSROADS
Apr 21, 8:30 AM CDT	FLASH FLOOD	Lewisville, AR	WATER COVERING SEVERAL ROADS IN LEWISVILLE.

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

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 0.3 hours before the alert went out and 123 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: 518 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

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

690 
WGUS54 KSHV 211216
FFWSHV
ARC057-061-073-081-091-099-133-211615-
/O.NEW.KSHV.FF.W.0003.110421T1216Z-110421T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
716 AM CDT THU APR 21 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HEMPSTEAD COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITY OF HOPE...
  SOUTHEASTERN HOWARD COUNTY IN SOUTHWEST ARKANSAS...
  NORTHERN LAFAYETTE COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITIES OF...STAMPS...LEWISVILLE...
  SOUTHEASTERN LITTLE RIVER COUNTY IN SOUTHWEST ARKANSAS...
  NORTHERN MILLER COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITY OF TEXARKANA...
  EXTREME SOUTHWESTERN NEVADA COUNTY IN SOUTHWEST ARKANSAS...
  EXTREME SOUTHEASTERN SEVIER COUNTY IN SOUTHWEST ARKANSAS...

* UNTIL 1115 AM CDT

* AT 709 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  VERY HEAVY RAIN FROM SEVERAL THUNDERSTORMS REPEATEDLY MOVING OVER 
  THE SAME AREAS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WASHINGTON...TOLLETTE...SARATOGA...PERRYTOWN...MANDEVILLE...
  FULTON...EMMET AND BLEVINS...

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SHREVEPORT.

&&

LAT...LON 3360 9404 3385 9400 3388 9345 3327 9344
      3328 9404

$$

12

2 follow-up statements

229 
WGUS74 KSHV 211342
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
842 AM CDT THU APR 21 2011

ARC061-099-133-211349-
/O.CAN.KSHV.FF.W.0003.000000T0000Z-110421T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEVADA AR-SEVIER AR-HOWARD AR-
842 AM CDT THU APR 21 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR HOWARD...SEVIER AND
NEVADA COUNTIES...

HEAVY RAINFALL HAS SUBSIDED FOR THE TIME BEING...AND ANY RESIDUAL 
FLOODING SHOULD END SOON.

LAT...LON 3360 9404 3367 9403 3366 9348 3347 9348
      3327 9344 3328 9404

$$

ARC057-073-081-091-211615-
/O.CON.KSHV.FF.W.0003.000000T0000Z-110421T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LITTLE RIVER AR-HEMPSTEAD AR-LAFAYETTE AR-MILLER AR-
842 AM CDT THU APR 21 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 AM CDT FOR
MILLER...LAFAYETTE...HEMPSTEAD AND LITTLE RIVER COUNTIES...

AT 837 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING OVER THE 
WARNED AREA. LOCAL LAW ENFORCEMENT OFFICIALS REPORTED SEVERAL AREAS 
AND ROADWAYS EXPERIENCING FLOODING. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FULTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. WHEN ENCOUNTERING FLOODED 
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SHREVEPORT.

&&

LAT...LON 3360 9404 3367 9403 3366 9348 3347 9348
      3327 9344 3328 9404

$$

12

386 
WGUS74 KSHV 211503
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1003 AM CDT THU APR 21 2011

ARC057-073-081-091-211615-
/O.CON.KSHV.FF.W.0003.000000T0000Z-110421T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LITTLE RIVER AR-HEMPSTEAD AR-LAFAYETTE AR-MILLER AR-
1003 AM CDT THU APR 21 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 AM CDT FOR
MILLER...LAFAYETTE...HEMPSTEAD AND LITTLE RIVER COUNTIES...

AT 958 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT THUNDERSTORMS PRODUCING HEAVY RAINFALL OVER THE WARNED AREA. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FULTON

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SHREVEPORT.

&&

LAT...LON 3356 9404 3367 9403 3366 9348 3347 9348
      3327 9344 3329 9372 3344 9383

$$

12

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 8:33 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	57 min
Apr 20, 8:56 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	64 min
Apr 20, 10:00 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Nevada	60 min
Apr 20, 10:35 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Sevier	40 min
Apr 21, 12:24 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	66 min
Apr 21, 1:14 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	61 min
Apr 21, 3:38 AM CDT	Flash Flood Warning	SHV	Hempstead, Howard, Little River, Nevada, Sevier	4 hr
Apr 21, 8:20 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	55 min
Apr 21, 8:25 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette	31 min
Apr 21, 8:35 AM CDT	Severe Thunderstorm Warning	SHV	Little River, Sevier	55 min
Apr 21, 8:59 AM CDT	Severe Thunderstorm Warning	SHV	Union	31 min
Apr 21, 2:56 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard	34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.