Alert archive / Texas / Flash Flood Warnings in 2004

Flash Flood Warning 13, NWS Norman, OK

April 23, 2004Clay County, Texas

NWS Norman, OK issued this flash flood warning at Apr 23, 2004, 11:50 PM CDT for Clay County, Texas. 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: Apr 23, 2004, 11:50 PM CDT (04:50 UTC)
Expired: Apr 24, 2004, 3:00 AM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Clay County, TX

The radar

The Altus AFB radar (KFDR), 116 km from the middle of the area, began a volume at 04:50 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

Fort Worth, TX (KFWD), launched 00:00Z, 4.8 hours before the alert went out and 116 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: 1475 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KOUN 240452
FFWOKC
TXC077-240800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1150 PM CDT FRI APR 23 2004

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CLAY COUNTY IN NORTHERN TEXAS

* UNTIL 300 AM CDT

* AT 1150 PM CDT...MODERATE RAIN CONTINUED TO FALL ACROSS SOUTHERN 
AND EASTERN CLAY COUNTY...AN AREA WHERE SEVERAL INCHES OF RAIN HAS 
FALLEN THE PAST COUPLE OF DAYS. BECAUSE OF THE SATURATED GROUND 
CONDITIONS...RUNOFF MAY CAUSE AREAS OF FLOODING THROUGH THE VERY 
EARLY MORNING...EVEN AFTER THE RAIN ENDS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  VASHTI...BUFFALO SPRINGS AND BELLEVUE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE TO
HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT DRIVE VEHICLES INTO
AREAS WHERE WATER COVERS THE ROADWAY.

LAT...LON 3350 9829 3348 9800 3377 9802 3364 9817

$$

1 follow-up statement

000 
WGUS74 KOUN 240627
FFSOKC
TXC077-240800-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
125 AM CDT SAT APR 24 2004

...FLASH FLOOD WARNING CONTINUES FOR CLAY COUNTY UNTIL 3 AM...

LIGHT TO MODERATE RAIN WILL CONTINUE TO FALL ACROSS SOUTHERN AND 
EASTERN CLAY COUNTY...AN AREA WHERE SEVERAL INCHES OF RAIN HAS 
FALLEN THE PAST COUPLE OF DAYS. BECAUSE OF THE SATURATED GROUND 
CONDITIONS...RUNOFF WILL CONTINUE TO CAUSE AREAS OF FLOODING THROUGH 
THE VERY EARLY MORNING...EVEN AFTER THE RAIN ENDS.

LOCATIONS THAT MAY BE AFFECTED INCLUDE...BUT ARE NOT LIMITED TO 
VASHTI...BUFFALO SPRINGS...BELLEVUE...AND STANFIELD. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
AS LITTLE AS 6 INCHES OF WATER MAY CAUSE YOU TO LOSE CONTROL OF YOUR
VEHICLE. TWO FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES
INCLUDING SUVS AND PICKUP TRUCKS. VEHICLES CAUGHT IN RISING WATER
SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE TO
HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT DRIVE VEHICLES INTO
AREAS WHERE WATER COVERS THE ROADWAY.

LAT...LON 3390 9797 3348 9798 3348 9829 3407 9816

$$

11

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 7:50 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	40 min

Nearby

Flash Flood Warnings in Texas, 2004 Every flash flood warning in 2004

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.