Alert archive / Texas / Flash Flood Warnings in 2009

Flash Flood Warning 62, NWS Fort Worth, TX

August 20, 2009Lamar County, Texas

NWS Fort Worth, TX issued this flash flood warning at Aug 20, 2009, 10:51 PM CDT for Lamar County, Texas. It was in force for 114 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: Aug 20, 2009, 10:51 PM CDT (03:51 UTC)
Expired: Aug 21, 2009, 12:45 AM CDT
In force: 114 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

County Lamar County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 202 km from the middle of the area, began a volume at 03:52 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 3.9 hours before the alert went out and 185 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: 2085 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 2065 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Aug 20, 10:07 PM CDT, 44 minutes earlier.

Area forecast discussion, Aug 20, 10:07 PM CDT, 44 minutes before

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Hazardous weather outlook, Aug 20, 8:38 PM CDT, 2 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
838 PM CDT THU AUG 20 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-211200-
MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN-
HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS-
ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL-
JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO-
FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE-
LEON-MILAM-ROBERTSON-
838 PM CDT THU AUG 20 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TONIGHT.
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS EAST OF A SHERMAN...
DALLAS...HILLSBORO...FAIRFIELD AND PALESTINE LINE OVERNIGHT. DAMAGING
WINDS...LARGE HAIL...BRIEF HEAVY RAINFALL...AND POSSIBLY A BRIEF TORNADO
WILL BE THE MAIN THREATS...AS SCATTERED STORMS MOVE THROUGH THE SLIGHT
RISK AREA.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
THUNDERSTORMS REMAIN POSSIBLE FRIDAY SOUTHEAST OF A TEMPLE...CORSICANA...
SULPHUR SPRINGS LINE. CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY RAIN
MAY ACCOMPANY THE STORMS.

.SPOTTER INFORMATION STATEMENT...
LIMITED SPOTTER ACTIVATION MAY BE REQUESTED ACROSS EASTERN NORTH TEXAS.

05/

In the hours before

Special weather statement, Aug 20, 10:29 PM CDT, 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1029 PM CDT THU AUG 20 2009

TXZ095-210400-
LAMAR TX-
1029 PM CDT THU AUG 20 2009

...SIGNIFICANT WEATHER ADVISORY FOR...
  LAMAR COUNTY

AT 1029 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 5 MILES NORTH OF PARIS...MOVING SOUTHEAST AT 15
MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE BLOSSOM...DEPORT AND PARIS.

TORRENTIAL RAINFALL AND WIND GUSTS TO 50 MPH ARE LIKELY WITH THIS STORM.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 AM CDT FRIDAY
MORNING FOR NORTHEASTERN TEXAS.

LAT...LON 3386 9545 3387 9533 3390 9533 3389 9530
      3338 9530 3338 9531 3343 9542 3368 9585
      3384 9585 3386 9581 3385 9577 3390 9575
      3390 9568 3395 9561
TIME...MOT...LOC 0329Z 307DEG 13KT 3373 9557

DUNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 9:34 PM CDT	Severe Thunderstorm Warning	FWD	Lamar	41 min
Aug 20, 10:29 PM CDT	Special Weather Statement	FWD	Lamar	31 min
Aug 20, 10:37 PM CDT	Areal Flood Advisory	FWD	Lamar	113 min
Aug 20, 10:49 PM CDT	Severe Thunderstorm Warning	FWD	Lamar	56 min
Aug 20, 11:35 PM CDT	Areal Flood Advisory	FWD	Fannin	115 min
Aug 20, 11:48 PM CDT	Special Weather Statement	FWD	Delta, Fannin, Lamar	27 min
Aug 21, 12:47 AM CDT	Flash Flood Warning	FWD	Fannin, Lamar	4 hr
Aug 21, 12:57 AM CDT	Severe Thunderstorm Warning	FWD	Fannin	36 min
Aug 21, 2:36 AM CDT	Special Weather Statement	FWD	Dallas	24 min
Aug 21, 2:55 AM CDT	Severe Thunderstorm Warning	FWD	Hopkins, Hunt, Rains	36 min
Aug 21, 3:46 AM CDT	Special Weather Statement	FWD	Van Zandt	29 min
Aug 21, 5:07 AM CDT	Special Weather Statement	FWD	Henderson	23 min
Aug 21, 5:46 AM CDT	Special Weather Statement	FWD	Navarro	29 min
Aug 21, 5:59 AM CDT	Severe Thunderstorm Warning	FWD	Henderson, Navarro	42 min
Aug 21, 6:16 AM CDT	Special Weather Statement	FWD	Ellis	29 min
Aug 21, 6:41 AM CDT	Areal Flood Advisory	FWD	Dallas, Tarrant	109 min
Aug 21, 6:42 AM CDT	Special Weather Statement	FWD	Ellis	33 min
Aug 21, 6:44 AM CDT	Special Weather Statement	FWD	Tarrant	31 min
Aug 21, 6:59 AM CDT	Special Weather Statement	FWD	Navarro	31 min
Aug 21, 7:11 AM CDT	Special Weather Statement	FWD	Dallas	34 min
Aug 21, 7:29 AM CDT	Special Weather Statement	FWD	Navarro	31 min
Aug 21, 7:37 AM CDT	River Flood Warning	FWD	Dallas	3 hr
Aug 21, 8:32 AM CDT	Special Weather Statement	FWD	Palo Pinto	28 min
Aug 21, 8:45 AM CDT	Severe Thunderstorm Warning	FWD	Palo Pinto	45 min
Aug 21, 8:54 AM CDT	Special Weather Statement	FWD	Parker	36 min
Aug 21, 8:58 AM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Parker	47 min
Aug 21, 9:26 AM CDT	Severe Thunderstorm Warning	FWD	Erath, Palo Pinto	64 min
Aug 21, 10:49 AM CDT	Special Weather Statement	FWD	Eastland	26 min

Nearby

Flash Flood Warnings in Texas, 2009 Every flash flood warning in 2009

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.