Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 263, NWS Norman, OK

May 9, 1999Tillman County, Oklahoma; Wichita County, Wilbarger County, Texas

NWS Norman, OK issued this severe thunderstorm warning at May 9, 1999, 9:26 PM CDT for Tillman County, Oklahoma; Wichita County, Wilbarger County, Texas. It was in force for 49 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 9, 1999, 9:26 PM CDT (02:26 UTC)
Expired
May 9, 1999, 10:15 PM CDT
In force
49 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Tillman County, OK, Wichita County, TX, Wilbarger County, TX

What was reported inside it

TimeReportWhereRemark
May 9, 9:45 PM CDTThunderstorm WindElectra, TX
May 9, 9:55 PM CDTThunderstorm Wind 59Grandfield, 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.

IssuedProductOfficeLasted
May 9, 6:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.4 hours before the alert went out and 213 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 1999-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2605 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 1999-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2605 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
1141 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.8
Supercell composite
9.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 May 9, 3:55 PM CDT, 5 hours 31 minutes earlier.

Area forecast discussion, May 9, 3:55 PM CDT, 5 hours 31 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
355 PM CDT SUN MAY 9 1999

...WITH UPDATED CCF NUMBERS...

CONVECTIVE CONCERNS WILL ONCE AGAIN HIGHLIGHT THIS FORECAST PACKAGE.
FIRST ROUND ONGOING ACROSS WEST TEXAS JUST AHEAD OF DRYLINE...AND IS
IS EXPECTED TO AFFECT MUCH OF THE WESTERN AND CENTRAL AREAS THIS
EVENING AND OVERNIGHT. THE POTENTIAL FOR HEAVY RAIN WILL
EXIST...ALONG WITH THE SEVERE WEATHER...ACROSS NORTH CENTRAL THROUGH
SOUTHWEST PORTIONS OF THE FORECAST AREA. THIS WILL BE WORDED IN THE
ZONE FORECASTS.

AFTER TONIGHT...IT DOESNT GET MUCH BETTER. DRYLINE EXPECTED TO SET
UP ONCE AGAIN...FARTHER EAST THAN TODAY...WHICH WILL YIELD THE
THREAT OF SEVERE WEATHER ACROSS MOST OF OKLAHOMA AND WESTERN NORTH
TEXAS. THE AMOUNT OF CONVECTION THE NEXT TWO DAYS WILL PLAY A MAJOR
ROLE IN DETERMINING WHERE THE MAIN SURFACE BOUNDARY WILL SET UP LATE
MONDAY THROUGH TUESDAY. CONCENSUS OF MODELS IS THAT BOUNDARY SHOULD
BE LOCATED FROM SW TO NE ACROSS OUR FORECAST AREA...WHICH I CANT
ARGUE. THIS WILL NOT HAVE A SIGNIFICANT IMPACT ON TEMPS...BUT QPFS
WILL BE CRITICAL TOWARD MID WEEK.

WILL CONTINUE WITH CHANCE OF THUNDERSTORMS THROUGH THE EXTENDED
PERIODS...WITH POTENTIAL FOR STRONG CONVECTION ASSOCIATED WITH
DRYLINE EACH DAY.

WENT CLOSE TO MOS GUID ON TEMPS...AOA FAN GUID ON POPS.

FCSTID = 11
OKC   66  81  66  80 /  60  40  60  40
HBR   66  84  63  82 /  80  40  30  30
SPS   68  84  66  84 /  60  40  40  40
GAG   63  82  56  78 /  80  20  20  20
PNC   67  82  65  79 /  80  40  60  30
DUA   68  82  68  81 /  40  40  50  40

.OUN...
OK...NONE.
TX...NONE.

In the hours before

Local storm report, May 9, 7:35 PM CDT, 1 hour 51 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
721 PM CDT SUN MAY  9 1999

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

0634 PM    IN WOODWARD               OK   63 MPH WIND GUST
05/09/99   WOODWARD

0625 PM    3 MI W CANUTE             OK   .75 INCH HAIL
05/09/99   WASHITA

0650 PM    5 W CUSTER CITY           OK   65 MPH WIND GUST
05/09/99   CUSTER

0625 PM    4 WNW CAMARGO             OK   58 MPH WIND GUST
05/09/99   DEWEY

0711 PM    10 MI W MAGNUM            OK   .75 INCH HAIL
05/09/99   GREER

0711 PM    QUARTZ MTN ST PARK        OK   .75 INCH HAIL
05/09/99   W KIOWA

0648 PM    12 NW LONE WOLF           OK   60 MPH WIND GUST
05/09/99   KIOWA

CW
Local storm report, May 9, 7:44 PM CDT, 1 hour 42 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
740 PM CDT SUN MAY  9 1999

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

0650 PM    3 N PUTNAM                OK   60 MPH WIND GUST
05/09/99   DEWEY

0725 PM    12 MI NW QUANAH           TX   .75 INCH HAIL
05/09/99   HARDEMAN

0727 PM    2 MI SE COOPERTON         OK   .88 INCH HAIL
05/09/99   KIOWA

0741 PM    IN GOTEBO                 OK   .75 INCH HAIL
05/09/99   KIOWA

CW
Local storm report, May 9, 8:01 PM CDT, 1 hour 25 minutes before
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Local storm report, May 9, 8:44 PM CDT, 42 minutes before
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Local storm report, May 9, 8:50 PM CDT, 36 minutes before
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Local storm report, May 9, 9:06 PM CDT, 20 minutes before
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 7:07 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson38 min
May 9, 7:19 PM CDTSevere Thunderstorm WarningOUNKiowa26 min
May 9, 7:29 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Major, Woods31 min
May 9, 7:29 PM CDTSevere Thunderstorm WarningOUNGrant31 min
May 9, 7:44 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Grady, Kingfisher46 min
May 9, 7:45 PM CDTSevere Thunderstorm WarningOUNGreer, Jackson, Kiowa, Tillman45 min
May 9, 8:00 PM CDTSevere Thunderstorm WarningOUNGarfield, Major45 min
May 9, 8:49 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Kiowa, Tillman41 min
May 9, 8:49 PM CDTSevere Thunderstorm WarningOUNCotton41 min
May 9, 9:29 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady46 min
May 10, 12:57 AM CDTSevere Thunderstorm WarningOUNAtoka48 min
May 10, 1:34 AM CDTSevere Thunderstorm WarningOUNBryan41 min
May 9, 8:00 PM CDTTornado WarningOUNFoard, Knox45 min
May 9, 8:45 PM CDTSevere Thunderstorm WarningOUNBaylor, Foard, Knox45 min
May 9, 8:45 PM CDTSevere Thunderstorm WarningOUNHardeman, Wilbarger45 min
May 9, 9:31 PM CDTSevere Thunderstorm WarningOUNFoard, Knox44 min

Nearby

Severe Thunderstorm Warnings in Texas, 1999Severe Thunderstorm Warnings in Oklahoma, 1999Every severe thunderstorm warning in 1999

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.