Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 151, NWS Fort Worth, TX

May 10, 1999Collin County, Denton County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 10, 1999, 12:23 AM CDT for Collin County, Denton County, Texas. It was in force for 52 min. 4 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 10, 1999, 12:23 AM CDT (05:23 UTC)
Expired: May 10, 1999, 1:15 AM CDT
In force: 52 min
Issued by: NWS Fort Worth, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Collin County, TX, Denton County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 82 km from the middle of the area, began a volume at 05:23 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
May 10, 12:40 AM CDT	Thunderstorm Wind	Celina, TX	Large trees were blown down by thunderstorm winds.
May 10, 12:40 AM CDT	Thunderstorm Wind	Mc Kinney, TX	Thunderstorm winds damaged some fences.
May 10, 12:45 AM CDT	Thunderstorm Wind	Plano, TX	Fences were damaged by thunderstorm winds.
May 10, 12:45 AM CDT	Thunderstorm Wind	Sanger, TX	Large tree limbs were blown down by thunderstorm winds.

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
May 9, 10:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.4 hours before the alert went out and 58 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: 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.

In the hours before

Special weather statement, May 9, 6:25 PM CDT, 5 hours 58 minutes before

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Special weather statement, May 9, 6:25 PM CDT, 5 hours 58 minutes before

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<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        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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Special weather statement, May 9, 11:56 PM CDT, 27 minutes before

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-092200-

SEVERE WEATHER OUTLOOK FOR NORTH TEXAS
NATIONAL WEATHER SERVICE FORT WORTH TX
1156 PM CDT SUN MAY 9 1999

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THAT PORTION
OF NORTH TEXAS GENERALLY WEST OF A BONHAM...ATHENS...CENTERVILLE
LINE MAINLY TONIGHT. THE THREAT OF A FEW SEVERE THUNDERSTORMS WILL
BEGIN IN WESTERN AREAS LATE THIS AFTERNOON OR EARLY THIS
EVENING...AND SPREAD ACROSS THE REMAINDER OF THE THREAT AREA TONIGHT.
THE SLIGHT RISK INCLUDES DENTON...EASTLAND...WEATHERFORD...WACO...
TEMPLE...CORSICANA...SHERMAN AND DENISON...AND THE DALLAS F0RT WORTH
METROPLEX.

WIDELY SCATTERED THUNDERSTORMS WILL FORM EAST OF THE WEST TEXAS DRY
LINE THIS AFTERNOON.  A FEW OF THESE STORMS WILL PRODUCE LARGE
HAIL AND DAMAGING WINDS LATE THIS AFTERNOON AND EVENING...MAINLY
WEST OF A JACKSBORO...STEPHENVILLE...GOLDTHWAITE LINE.  TONIGHT...
SCATTERED THUNDERSTORMS WILL FORM ACROSS MOST OF NORTH TEXAS...IN
RESPONSE TO FAVORABLE ALIGNMENT OF THE SUB-TROPICAL JET STREAM IN
SOUTH AND CENTRAL TEXAS AND A VERY UNSTABLE ATMOSPHERE ACROSS NORTH
TEXAS.  ONCE AGAIN...DAMAGING WINDS AND HAIL WILL BE THE MAIN THREATS
FROM THESE STORMS.  LOCALLY HEAVY RAINFALL MAY ALSO OCCUR TONIGHT.

AT THE CURRENT TIME IT APPEARS THAT THE THREAT OF TORNADOES WILL BE
MINIMAL BECAUSE OF RATHER WEAK WIND SPEEDS ALOFT.  HOWEVER...ANY
ACCELERATION OF THESE WINDS COULD RESULT IN SOME INCREASE IN THE
TORNADO THREAT.

STORM SPOTTERS AND EMERGENCY OPERATING CENTERS MAY BE ACTIVATED
LATE THIS AFTERNOON IN WESTERN SECTIONS...AND TONIGHT ACROSS ALL
OF NORTH TEXAS.

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 10, 12:04 AM CDT	Severe Thunderstorm Warning	FWD	Comanche	41 min
May 10, 12:14 AM CDT	Severe Thunderstorm Warning	FWD	Erath	46 min
May 10, 12:42 AM CDT	Severe Thunderstorm Warning	FWD	Montague	48 min
May 10, 1:01 AM CDT	Tornado Warning	FWD	Hood	29 min
May 10, 1:10 AM CDT	Severe Thunderstorm Warning	FWD	Parker	50 min
May 10, 2:18 AM CDT	Tornado Warning	FWD	Denton	12 min
May 10, 2:28 AM CDT	Tornado Warning	FWD	Denton	32 min
May 10, 3:35 AM CDT	Flash Flood Warning	FWD	Cooke, Grayson	3 hr
May 10, 7:57 AM CDT	Severe Thunderstorm Warning	FWD	Mills	63 min
May 10, 10:10 AM CDT	Severe Thunderstorm Warning	FWD	Bell	35 min
May 10, 4:41 PM CDT	Severe Thunderstorm Warning	FWD	Anderson	13 hr

Nearby

Severe Thunderstorm Warnings in Texas, 1999 Every 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; radar from the NEXRAD Level II archive.