Alert archive / Texas / Flash Flood Warnings in 2008

Flash Flood Warning 21, NWS Shreveport, LA

April 9, 20084 counties in Texas; McCurtain County, Oklahoma

NWS Shreveport, LA issued this flash flood warning at Apr 9, 2008, 1:45 AM CDT for 4 counties in Texas; McCurtain County, Oklahoma. It was in force for 4 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: Apr 9, 2008, 1:45 AM CDT (06:45 UTC)
Expired: Apr 9, 2008, 5:45 AM CDT
In force: 4 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties McCurtain County, OK, Bowie County, TX, Franklin County, TX, Red River County, TX, Titus County, TX

The radar

The Shreveport radar (KSHV), 153 km from the middle of the area, began a volume at 06:49 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 9, 2:20 AM CDT	FLASH FLOOD	7 Wnw De Kalb, TX	HIGHWAY 82 IS FLOODED NEAR THE BOWIE COUNTY/RED RIVER COUNTY LINE. TRUCK HAD STALLED OUT IN HIGH WATER.

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, 6.8 hours before the alert went out and 156 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: 453 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1512 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSHV 090650
FFWSHV
OKC089-TXC037-159-387-449-091045-
/O.NEW.KSHV.FF.W.0021.080409T0645Z-080409T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
145 AM CDT WED APR 9 2008

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN BOWIE COUNTY IN NORTHEAST TEXAS...
  NORTHERN FRANKLIN COUNTY IN NORTHEAST TEXAS...
  THIS INCLUDES THE CITY OF HAGANSPORT...
  RED RIVER COUNTY IN NORTHEAST TEXAS...
  THIS INCLUDES THE CITIES OF...CLARKSVILLE...BOXELDER...
  NORTHERN TITUS COUNTY IN NORTHEAST TEXAS...
  SOUTHEASTERN MCCURTAIN COUNTY IN SOUTHEAST OKLAHOMA...

* UNTIL 545 AM CDT

* AT 140 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAIN FALLING REPEATEDLY OVER THE SAME LOCATIONS WITHIN THE
  WARNING AREA. SEVERAL INCHES OF RAIN MAY ACCUMULATE...PRODUCING
  FLASH FLOODING.

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.

MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO 
CROSS WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER 
TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO 
ESCAPE RISING WATER MOVE UP 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 3341 9447 3328 9531 3381 9531 3393 9448
TIME...MOT...LOC 0645Z 245DEG 0KT 3371 9451 3351 9522

$$

17

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 7:09 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Upshur, Wood	36 min
Apr 8, 8:00 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Cass, Harrison, Marion, Morris, Titus and 1 more	45 min
Apr 8, 8:29 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Marion	46 min
Apr 8, 8:45 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	60 min
Apr 8, 8:57 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	48 min
Apr 8, 9:02 PM CDT	Flash Flood Watch	SHV	Bowie, Camp, Cass, Franklin, Morris, Red River and 3 more	13 hr
Apr 8, 9:44 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Rusk, Smith	61 min
Apr 8, 11:16 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	44 min
Apr 8, 11:52 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Smith, Upshur, Wood	38 min
Apr 9, 12:20 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	55 min
Apr 9, 12:49 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison	56 min
Apr 9, 2:19 AM CDT	Flash Flood Warning	SHV	Bowie	6 hr
Apr 9, 5:33 AM CDT	Flash Flood Warning	SHV	Bowie, Franklin, Morris, Titus	4 hr
Apr 9, 4:36 PM CDT	Flash Flood Watch	SHV	Bowie, Camp, Cass, Franklin, Morris, Red River and 3 more	23 hr

Nearby

Flash Flood Warnings in Texas, 2008 Flash Flood Warnings in Oklahoma, 2008 Every flash flood warning in 2008

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.