Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 19, NWS Norman, OK

February 24, 2001Clay County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Feb 24, 2001, 8:32 AM CST for Clay County, Texas. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Feb 24, 2001, 8:32 AM CST (14:32 UTC)
Expired: Feb 24, 2001, 9:15 AM CST
In force: 43 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Clay County, TX

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Feb 24, 7:15 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 2.5 hours before the alert went out and 141 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: 1959 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 364 m²/s²
0-3 km storm-relative helicity: 481 m²/s²
Significant tornado parameter: 4.6
Supercell composite: 18.5

Open this sounding in Storm Lab

The text

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

697 
WUUS54 KOUN 241434
SVROKC
TXC077-241515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
832 AM CST SAT FEB 24 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLAY COUNTY IN NORTHERN TEXAS

* UNTIL 915 AM CST

* AT 828 AM CST...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 17
  MILES SOUTHWEST OF HENRIETTA...MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IN THE WARNING INCLUDE HENRIETTA

THIS SEVERE THUNDERSTORM PRODUCED DIME SIZE HAIL NEAR WINDTHORST
AROUND 8:22 AM.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING. MOVE
IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF A
TORNADO IS SIGHTED.

LAT...LON 3373 9843 3361 9841 3388 9796 3400 9817

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 24, 4:35 AM CST, 3 hours 57 minutes earlier.

Area forecast discussion, Feb 24, 4:35 AM CST, 3 hours 57 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
330 AM CST SAT FEB 24 2001

NOT MUCH TIME FOR DISCUSSION THIS MRNG WITH SVR WX ALREADY IN
PROGRESS IN PARTS OF THE FA. STG NEG TILT UPR SYS WILL EJECT FROM
THE SRN ROCKIES INTO THE PLAINS DURING THE DAY. MEANWHILE WARM FRONT
ALG THE RED RIVER ERLY THIS MRNG CONTS TO LIFT SLOWLY NWD WITH 60+
DEWPOPINT AIR S OF THIS BNDRY. BEST SVR THRT THIS MRNG WILL LIKELY
BE IN VNCTY OF THE WARM FRONT ACRS N TX AND SRN OK ZONES AS SQUALL
INTERSECTS THIS BNDRY. SVR WX THRT WILL SHIFT INTO ERN SECS OF THE
FA LATER TODAY AS WARM FRONT CONTS TO LIFT NWD AND SFC LO
STRENGTHENS AND MOVES EWD. WILL CONT FFA INTO THE DAY FOR MUCH OF
THE AREA. ALTHOUGH STORMS WILL BE REL FAST HEAVY RAIN STILL A
THREAT...IN ADDITION RAINFALL ACROSS THE AREA THURSDAY NIGHT AND
FRIDAY HAS LEFT FFG VALUES PRETTY LOW. NEXT PROB TO DEAL WITH IN THE
FIRST PD WILL BE STG SWLY WINDS EXPECTED TO DEVELOP BEHIND THE DRY
LINE. DEEPENING SFC LO EXPECTED TO MOVE FROM SWRN KS THIS MRNG INTO
NERN KS BY THE END OF THE DAY. SFC GRAD WILL TIGHTEN ACRS THE FA. IN
ADDITION STG WINDS ALOFT...H8 WINDS OF 40 TO 50 KTS AND H7 WINDS OF
50 TO 70 KTS MAY MIX DOWN DURING THE AFTN. WILL INCLUDE WIND ADVY
FOR ALL ZONES ALTHO ERN AREAS WILL NOT LIKELY SEE THE STRONG WINDS
UNTIL AFTN. DAY SHIFT WILL NOT TO MONITOR FOR PSBL UPGRADE TO HI
WIND WRNG. ACTIVITY SHUD BE EAST OFTHE FA BY THIS EVENING SO WILL LV
FCST DRY FROM TONIGHT INTO SUNDAY NIGHT. RETURN FLOW AND AN APCHG
UPR SYS BRING A THRT OF PRECIP MONDAY WITH A CANADIAN CDFNT EXPECTED
TO PUNCH INTO THE AREA TUESDAY. WILL CONT WITH MENTION OF SNOW FOR
NRN SECS TUESDAY WITH RAIN IN THE S. NUMBERS TO FOLLOW LATER.

FCSTID = 2
OKC   64  35  57  41 / 100   0   0  10
HBR   67  34  58  41 /  40   0   0  10
SPS   70  37  63  43 /  80   0   0  10
GAG   59  28  55  35 /  60  10   0  10
PNC   62  32  54  39 / 100   0   0  10
DUA   70  40  62  42 / 100   0   0  10

.OUN...
OK...FLASH FLOOD WATCH TODAY
OKZ007>008-012>013-018>020-023>032-037>048-050>052.
     WIND ADVISORY TODAY OKZ004>052.
TX...FLOOD WATCH TTHIS MORNING TXZ086-089-090.
     WIND ADVISORY TODAY TXZ083>090.

In the hours before

Local storm report, Feb 24, 3:18 AM CST, 5 hours 14 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
318 AM CST SAT FEB 24 2001

TIME (CST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0256 AM    MANGUM                    OK   .88 INCH HAIL
02/24/01   GREER                          SHERIFF DEPT.

FM

Special weather statement, Feb 24, 6:30 AM CST, 2 hours 2 minutes before

OKZ004>048-050>052-TXZ083>090-241500-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
630 AM CST SAT FEB 24 2001

TODAYS THUNDERSTORM OUTLOOK CALLS FOR A SLIGHT RISK OF SEVERE
THUNDERSTORMS...GENERALLY EAST OF A LINE FROM PONCA CITY TO
KINGFISHER TO LAWTON AND VERNON...TEXAS.  THERE IS A MODERATE RISK
OF SEVERE THUNDERSTORMS...MAINLY EAST OF A HOLDENVILLE TO COALGATE
TO ATOKA AND DURANT LINE.   THE MAIN THREAT WILL BE LARGE HAIL AND
DAMAGING WINDS...WITH A SECONDARY THREAT OF TORNADOES IN THE
MODERATE RISK AREA.

.DISCUSSION...AN INTENSE UPPER LEVEL STORM SYSTEM OVER NEW
MEXICO WILL LIFT OUT ACROSS THE SOUTHERN PLAINS TODAY...WHILE
AN AREA OF LOW PRESSURE OVER SOUTHEAST COLORADO INTENSIFIES
AND MOVES EAST.  STRONG SOUTHEAST WINDS AT THE SURFACE WILL
CONTINUE TO TRANSPORT DEWPOINTS IN THE UPPER 50S TO LOWER 60S ACROSS
THE EASTERN HALF OF OKLAHOMA.  THUNDERSTORMS FORMING ALONG THE
DRYLINE IN WESTERN OKLAHOMA WILL CONTINUE TO PUSH EAST THIS MORNING
INTO A MORE UNSTABLE ENVIRONMENT.  AS STORMS BECOME MORE SURFACE
BASED...ESPECIALLY OVER SOUTHEAST OKLAHOMA...THE THREAT FOR LARGE
HAIL AND DAMAGING THUNDERSTORM WINDS WILL INCREASE.  LOW LEVEL WIND
SHEAR WILL CONTINUE TO SUPPORT ROTATING STORMS...ESPECIALLY STORMS
THAT ARE ABLE TO FORM AHEAD OF THE LINE.

EMERGENCY MANAGERS IN THE SLIGHT AND MODERATE RISK AREAS SHOULD BE
PREPARED FOR STORM SPOTTING ACTIVATION THIS MORNING.

6

Local storm report, Feb 24, 8:30 AM CST, 2 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
830 AM CST SAT FEB 24 2001

TIME (CST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0822 AM    4 W WINDTHORST            TX   .75 INCH HAIL
02/24/01   ARCHER

CW

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 2:10 AM CST	Severe Thunderstorm Warning	OUN	Hardeman	50 min
Feb 24, 3:53 AM CST	Severe Thunderstorm Warning	OUN	Hardeman	52 min
Feb 24, 8:11 AM CST	Severe Thunderstorm Warning	OUN	Archer	49 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001 Every severe thunderstorm warning in 2001

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.