Alert archive / Arkansas / Flash Flood Warnings in 2009

Flash Flood Warning 21, NWS Shreveport, LA

May 9, 2009Miller County, Arkansas; Bowie County, Texas

NWS Shreveport, LA issued this flash flood warning at May 9, 2009, 10:16 PM CDT for Miller County, Arkansas; Bowie County, Texas. It was in force for 3 hr. 4 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: May 9, 2009, 10:16 PM CDT (03:16 UTC)
Expired: May 10, 2009, 1:15 AM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Miller County, AR, Bowie County, TX

The radar

The Shreveport radar (KSHV), 111 km from the middle of the area, began a volume at 03:17 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
May 9, 11:15 PM CDT	FLASH FLOOD	Texarkana, TX	COLLEGE DRIVE UNDERPASS IS FLOODED. ANOTHER DRIVER STRANDED IN FLOOD WATERS AT THE 7TH STREET UNDERPASS. FIRE DEPT IN ROUTE.
May 9, 11:20 PM CDT	FLASH FLOOD	Texarkana, TX	MEADOWBROOK LANE FLOODED. REPORT RELAYED VIA HAM RADIO FROM WFO LITTLE ROCK.
May 9, 11:25 PM CDT	FLASH FLOOD	Texarkana, AR	EAST 9TH AND BROAD ON THE ARKANSAS SIDE OF TEXARKANA IS FLOODED. CAR STRANDED IN THE UNDERPASS.
May 9, 11:30 PM CDT	FLASH FLOOD	2 Se Texarkana, AR	HIGHWAY 237 AT BOYD RD COMPLETELY UNDERWATER.

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 00:00Z, 3.3 hours before the alert went out and 110 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: 1854 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 737 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 8.2

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSHV 100316
FFWSHV
ARC091-TXC037-100615-
/O.NEW.KSHV.FF.W.0021.090510T0316Z-090510T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1016 PM CDT SAT MAY 9 2009

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN BOWIE COUNTY IN NORTHEAST TEXAS...
  THIS INCLUDES THE CITIES OF...WAKE VILLAGE...TEXARKANA...SIMMS...
  NEW BOSTON...
  NORTHERN MILLER COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITY OF TEXARKANA...

* UNTIL 115 AM CDT

* AT 1012 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED  
  TO INDICATE FLASH FLOODING FROM THUNDERSTORMS PRODUCING HEAVY      
  RAINFALL OVER THE WARNED AREA. RADAR INDICATES THAT HOURLY         
  RAINFALL RATES OF AN INCH AND A HALF TO NEARLY TWO INCHES PER HOUR 
  CONTINUES TO FALL OVER AREAS THAT HAVE RECEIVED WIDESPREAD FOUR TO 
  SEVEN INCHES OF RAIN SINCE THIS AFTERNOON. SEVERAL ROADS REMAIN 
  CLOSED DUE TO FLOODING THROUGHOUT BOWIE COUNTY...INCLUDING HIGHWAY 
  82 EAST BETWEEN NEW BOSTON AND TEXARKANA...WHERE THE HEAVIEST 
  RAINFALL WILL BE TRAVERSING ACROSS DURING THE NEXT HOUR. FLASH FLOODING 
  WILL BE POSSIBLE IN THE CITY OF TEXARKANA AS THESE THUNDERSTORMS 
  CONTAINING HEAVY RAINFALL APPROACH THE CITY BY 11 PM. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RED BANK...
  HOMAN AND HERVEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF TWO TO POSSIBLY FOUR INCHES WILL BE  
POSSIBLE IN THE WARNED AREA THROUGH 115 AM.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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.

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

&&

LAT...LON 3355 9438 3358 9407 3354 9398 3359 9380
      3354 9380 3354 9378 3344 9373 3344 9375
      3339 9370 3322 9373 3331 9416 3330 9421
      3325 9424 3327 9442 3329 9447 3328 9455
      3363 9455

$$

15

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 10:41 PM CDT	Severe Thunderstorm Warning	SHV	Lafayette, Miller	64 min
May 10, 12:58 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	32 min
May 10, 2:05 AM CDT	Flash Flood Warning	SHV	Hempstead, Howard, Little River, Sevier	12 hr
May 10, 2:36 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard	54 min
May 10, 3:21 AM CDT	Severe Thunderstorm Warning	SHV	Nevada	54 min
May 10, 4:57 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Little River	63 min
May 10, 5:38 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	52 min
May 10, 6:31 AM CDT	Flash Flood Warning	SHV	Miller	8 hr
May 10, 7:26 AM CDT	Flash Flood Warning	SHV	Nevada	7 hr
May 10, 9:58 AM CDT	River Flood Warning	SHV	Howard, Little River, Sevier	6 days
May 10, 10:00 AM CDT	River Flood Warning	SHV	Little River	6 days
May 10, 2:17 PM CDT	Flash Flood Warning	SHV	Hempstead, Howard, Little River, Sevier	4 hr
May 10, 4:03 PM CDT	Flash Flood Warning	SHV	Nevada	57 min
May 9, 10:21 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	24 min
May 10, 1:05 AM CDT	Severe Thunderstorm Warning	SHV	Red River	55 min
May 10, 1:50 AM CDT	Severe Thunderstorm Warning	SHV	Red River	55 min

Nearby

Flash Flood Warnings in Arkansas, 2009 Flash Flood Warnings in Texas, 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; radar from the NEXRAD Level II archive.