Alert archive / Texas / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 406, NWS Fort Worth, TX

December 9, 2008Ellis County, Navarro County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Dec 9, 2008, 12:29 AM CST for Ellis County, Navarro County, Texas. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 9, 2008, 12:29 AM CST (06:29 UTC)
Expired: Dec 9, 2008, 1:00 AM CST
In force: 31 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

Counties Ellis County, TX, Navarro County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 76 km from the middle of the area, began a volume at 06:31 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 watch it was issued in

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

Issued	Product	Office	Lasted
Dec 8, 9:37 PM CST	Severe Thunderstorm Watch	SPC	5 hr
Dec 8, 11:31 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 6.5 hours before the alert went out and 94 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: 259 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1028 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 307 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Dec 8, 11:43 PM CST, 46 minutes earlier.

Area forecast discussion, Dec 8, 11:43 PM CST, 46 minutes before

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Hazardous weather outlook, Dec 8, 11:49 PM CST, 40 minutes before

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In the hours before

Special weather statement, Dec 8, 9:47 PM CST, 2 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
947 PM CST MON DEC 8 2008

TXZ092-093-103-104-090415-
GRAYSON TX-COOKE TX-DENTON TX-COLLIN TX-
947 PM CST MON DEC 8 2008

...SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHWESTERN COLLIN COUNTY
  SOUTHEASTERN COOKE COUNTY
  NORTHEASTERN DENTON COUNTY
  GRAYSON COUNTY

AT 947 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 10 MILES NORTH OF
WHITESBORO TO 4 MILES NORTHWEST OF DENTON...MOVING NORTHEAST AT 50
MPH.

CITIES IN THE PATH OF THESE STORMS INCLUDE ANNA...AUBREY...CELINA...
COLLINSVILLE...CROSS ROADS...DENISON...DENTON...DORCHESTER...
GUNTER...HOWE...KNOLLWOOD...KRUGERVILLE...PILOT POINT...POTTSBORO...
PROSPER...SHERMAN...TOM BEAN...VAN ALSTYNE...WHITESBORO...HENDRIX...
EISENHOWER STATE PARK...RAY ROBERTS PARK ISLE DU BOIS AND RAY ROBERTS
PARK JOHNSON BRANCH.

FREQUENT CLOUD TO GROUND LIGHTNING...VERY HEAVY RAINFALL...PEA-SIZED
HAIL...AND WIND GUSTS TO 50 MPH CAN BE EXPECTED FROM THESE STORMS.

IF THIS STORM INTENSIFIES...A SEVERE WEATHER WARNING MAY BE NEEDED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM CST
TUESDAY MORNING FOR NORTHEASTERN TEXAS.

LAT...LON 3386 9677 3384 9676 3385 9670 3381 9650
      3378 9648 3379 9644 3378 9641 3377 9639
      3321 9654 3317 9724 3387 9687
TIME...MOT...LOC 0347Z 243DEG 42KT 3383 9681 3329 9710

Special weather statement, Dec 8, 10:45 PM CST, 1 hour 44 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1045 PM CST MON DEC 8 2008

TXZ104-119-090515-
COLLIN TX-DALLAS TX-
1045 PM CST MON DEC 8 2008

...SIGNIFICANT WEATHER ADVISORY FOR...
  COLLIN COUNTY
  NORTHERN DALLAS COUNTY

AT 1045 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 2 MILES SOUTHEAST OF COPPELL...MOVING NORTHEAST
AT 45 MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE ADDISON...ALLEN...
CARROLLTON...COPPELL...FAIRVIEW...FARMERS BRANCH...FRISCO...LOWRY
CROSSING...LUCAS...MCKINNEY...MURPHY...PARKER...PLANO...PRINCETON...
RICHARDSON...SACHSE AND WYLIE.

FREQUENT CLOUD TO GROUND LIGHTNING...VERY HEAVY RAINFALL...PEA-SIZED
HAIL...AND WIND GUSTS TO 45 MPH CAN BE EXPECTED FROM THIS STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM CST
TUESDAY MORNING FOR NORTHEASTERN TEXAS.

LAT...LON 3333 9651 3300 9639 3298 9644 3299 9651
      3296 9652 3285 9695 3299 9701 3299 9684
      3313 9684
TIME...MOT...LOC 0445Z 240DEG 40KT 3297 9691

07/BB

Local storm report, Dec 8, 11:10 PM CST, 1 hour 19 minutes before

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Local storm report, Dec 8, 11:18 PM CST, 1 hour 11 minutes before

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Special weather statement, Dec 8, 11:34 PM CST, 55 minutes before

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Special weather statement, Dec 8, 11:40 PM CST, 49 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 8, 9:07 PM CST	Special Weather Statement	FWD	Cooke, Denton	23 min
Dec 8, 9:11 PM CST	Special Weather Statement	FWD	Hood, Somervell, Tarrant	34 min
Dec 8, 9:43 PM CST	Special Weather Statement	FWD	Tarrant	32 min
Dec 8, 9:47 PM CST	Special Weather Statement	FWD	Denton, Grayson	28 min
Dec 8, 10:13 PM CST	Severe Thunderstorm Warning	FWD	Grayson	47 min
Dec 8, 10:24 PM CST	Tornado Warning	FWD	Grayson	36 min
Dec 8, 10:45 PM CST	Special Weather Statement	FWD	Collin	30 min
Dec 8, 11:09 PM CST	Tornado Warning	FWD	Collin	36 min
Dec 8, 11:34 PM CST	Special Weather Statement	FWD	Hill	26 min
Dec 8, 11:40 PM CST	Special Weather Statement	FWD	Fannin	35 min
Dec 8, 11:51 PM CST	Severe Thunderstorm Warning	FWD	Ellis, Hill, Navarro	39 min
Dec 9, 12:53 AM CST	Severe Thunderstorm Warning	FWD	Ellis, Henderson, Kaufman, Navarro	40 min
Dec 9, 3:34 AM CST	Special Weather Statement	FWD	Kaufman	26 min
Dec 9, 3:37 AM CST	Wind Advisory	FWD	Anderson, Bell, Bosque, Collin, Comanche, Cooke and 40 more	20 hr
Dec 9, 4:04 AM CST	Special Weather Statement	FWD	Van Zandt	26 min
Dec 9, 4:39 AM CST	Special Weather Statement	FWD	McLennan	36 min
Dec 9, 4:41 AM CST	Special Weather Statement	FWD	Van Zandt	34 min
Dec 9, 5:08 AM CST	Special Weather Statement	FWD	Limestone	37 min
Dec 9, 5:22 AM CST	Severe Thunderstorm Warning	FWD	Freestone, Limestone, Navarro	53 min
Dec 9, 6:00 AM CST	Special Weather Statement	FWD	Henderson	30 min
Dec 9, 6:29 AM CST	Severe Thunderstorm Warning	FWD	Anderson	49 min
Dec 9, 7:47 AM CST	Special Weather Statement	FWD	McLennan	28 min
Dec 9, 7:50 AM CST	Severe Thunderstorm Warning	FWD	McLennan	39 min
Dec 9, 9:10 AM CST	Special Weather Statement	FWD	Freestone	35 min

Nearby

Severe Thunderstorm Warnings in Texas, 2008 Every severe thunderstorm warning in 2008

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.