Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 23, NWS Norman, OK

February 24, 2001Johnston County, Pontotoc County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Feb 24, 2001, 10:18 AM CST for Johnston County, Pontotoc County, Oklahoma. It was in force for 42 min. 1 report came from 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, with what was reported inside it.

The facts

Issued: Feb 24, 2001, 10:18 AM CST (16:18 UTC)
Expired: Feb 24, 2001, 11:00 AM CST
In force: 42 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Johnston County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 96 km from the middle of the area, began a volume at 16:19 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
Feb 24, 10:25 AM CST	Hail 0.75	Mill Creek, OK

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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

Norman, OK (KOUN), launched 12:00Z, 4.3 hours before the alert went out and 92 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: 170 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 452 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 544 m²/s²
0-3 km storm-relative helicity: 578 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.6

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 241619
SVROKC
OKC069-123-241700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1018 AM CST SAT FEB 24 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA
  JOHNSTON COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 1100 AM CST

* AT 1014 AM CST...DOPPLER RADAR DETECTED A LINE OF SEVERE 
THUNDERSTORMS FROM 12 MILES WEST OF ADA TO 8 MILES WEST OF 
TISHOMINGO...MOVING EAST AT 35 MPH. WIND GUSTS TO 65 MPH AND NICKEL 
SIZE HAIL ARE LIKELY.

* LOCATIONS IN THE WARNING INCLUDE ADA...CONNERVILE...FITTSTOWN...
  MILL CREEK...PONTOTOC...RAVIA...REAGAN AND TISHOMINGO

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING PARTICULARLY DAMAGING
WINDS. MOBILE HOMES AND HIGH PROFILE VEHICLES ARE ESPECIALLY
SUSCEPTIBLE TO HIGH WINDS AND MAY BE OVERTURNED. MOVE TO A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 3492 9690 3450 9680 3420 9692 3418 9658
          3457 9660 3479 9655

CJS

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, 5 hours 43 minutes earlier.

Area forecast discussion, Feb 24, 4:35 AM CST, 5 hours 43 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

Special weather statement, Feb 24, 6:30 AM CST, 3 hours 48 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, 1 hour 48 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

Local storm report, Feb 24, 9:50 AM CST, 28 minutes before

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

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

0922 AM    CHANDLER                  OK   .75 INCH HAIL
02/24/01   LINCOLN                        BY SHERIFF OFFICE.

CW

Local storm report, Feb 24, 9:57 AM CST, 21 minutes before

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

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

0944 AM    STROUD                    OK   WIND DAMAGE
02/24/01   LINCOLN                        PWR LINES DOWN. BY E.M.

CW

Local storm report, Feb 24, 10:15 AM CST, 3 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1015 AM CST SAT FEB 24 2001

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

0950 AM    EAST SIDE OF LONE GROVE   OK   WIND DAMAGE
02/24/01   CARTER                         HIGH WINDS LIFTED ROOF ON
                                          BLDG..CAUSING WALLS TO
                                          COLLASPEN. EM REPORT.

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	Harmon	50 min
Feb 24, 2:10 AM CST	Severe Thunderstorm Warning	OUN	Greer	50 min
Feb 24, 3:53 AM CST	Severe Thunderstorm Warning	OUN	Jackson	52 min
Feb 24, 5:12 AM CST	Severe Thunderstorm Warning	OUN	Kay, Noble	48 min
Feb 24, 9:28 AM CST	Severe Thunderstorm Warning	OUN	Lincoln	47 min
Feb 24, 9:46 AM CST	Severe Thunderstorm Warning	OUN	Coal	44 min
Feb 24, 10:01 AM CST	Severe Thunderstorm Warning	OUN	Love, Marshall	44 min
Feb 24, 10:49 AM CST	Severe Thunderstorm Warning	OUN	Bryan, Marshall	41 min
Feb 24, 10:57 AM CST	Severe Thunderstorm Warning	OUN	Atoka, Coal	48 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.