Alert archive / Texas / Flash Flood Warnings in 2009

Flash Flood Warning 17, NWS Fort Worth, TX

April 29, 2009Fannin County, Grayson County, Texas

NWS Fort Worth, TX issued this flash flood warning at Apr 29, 2009, 3:00 PM CDT for Fannin County, Grayson County, Texas. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 29, 2009, 3:00 PM CDT (20:00 UTC)
Expired: Apr 29, 2009, 9:00 PM CDT
In force: 6 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

Counties Fannin County, TX, Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 143 km from the middle of the area, began a volume at 20:02 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 12:00Z, 8.0 hours before the alert went out and 120 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: 1229 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.4

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 Apr 29, 2:56 PM CDT, 4 minutes earlier.

Area forecast discussion, Apr 29, 2:56 PM CDT, 4 minutes before

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Hazardous weather outlook, Apr 29, 9:46 AM CDT, 5 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
946 AM CDT WED APR 29 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-301200-
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-
946 AM CDT WED APR 29 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS ARE EXPECTED ACROSS NORTH TEXAS TODAY AND TONIGHT. THERE
IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS THE NORTHWESTERN
TWO-THIRDS OF NORTH TEXAS. LARGE HAIL...DAMAGING WINDS AND
LOCALIZED HEAVY RAINFALL WILL BE THE MAIN THREATS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

A SLIGHT CHANCE OF THUNDERSTORMS WILL CONTINUE EAST OF INTERSTATE 35
THURSDAY.

FRIDAY THROUGH MONDAY...THUNDERSTORM CHANCES WILL SPREAD FROM NORTH
TO SOUTH ALONG A COLD FRONT. THERE IS ALSO A CHANCE FOR THUNDERSTORMS
ON TUESDAY. OCCASIONAL STRONG TO SEVERE STORMS WITH LOCALLY HEAVY
RAINFALL ARE POSSIBLE THROUGH THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS LIKELY ALONG THE RED RIVER THIS MORNING AND
ADDITIONAL ACTIVATION IS POSSIBLE ELSEWHERE THROUGHOUT THE DAY.

82/JLD

In the hours before

Special weather statement, Apr 29, 12:18 PM CDT, 2 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1218 PM CDT WED APR 29 2009

TXZ093-291745-
GRAYSON TX-
1218 PM CDT WED APR 29 2009

...SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHERN GRAYSON COUNTY

AT 1218 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 4 MILES NORTH OF WHITESBORO...MOVING EAST AT 35
MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE DENISON...KNOLLWOOD...
POTTSBORO...WHITESBORO AND EISENHOWER STATE PARK.

PEA-SIZED HAIL AND WIND GUSTS TO 50 MPH CAN BE EXPECTED FROM THIS
STORM.

IF THIS STORM CONTINUES ON ITS PRESENT COURSE...A SEVERE WEATHER
WARNING MAY BE NEEDED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM CDT
WEDNESDAY AFTERNOON FOR NORTHEASTERN TEXAS.

LAT...LON 3388 9658 3385 9661 3383 9656 3383 9651
      3378 9648 3379 9643 3369 9636 3361 9694
      3388 9694 3384 9671 3387 9669 3390 9658
TIME...MOT...LOC 1718Z 266DEG 31KT 3372 9686

Special weather statement, Apr 29, 12:21 PM CDT, 2 hours 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1221 PM CDT WED APR 29 2009

TXZ102-291745-
WISE TX-
1221 PM CDT WED APR 29 2009

...SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHEASTERN WISE COUNTY

AT 1221 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 5 MILES SOUTHWEST OF DECATUR...MOVING NORTHEAST
AT 25 MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE ALVORD AND DECATUR.

PEA-SIZED HAIL AND WIND GUSTS TO 50 MPH CAN BE EXPECTED FROM THIS
STORM.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM CDT
WEDNESDAY AFTERNOON FOR NORTHEASTERN TEXAS.

LAT...LON 3343 9755 3343 9739 3343 9738 3320 9738
      3314 9770 3344 9771 3344 9755
TIME...MOT...LOC 1721Z 236DEG 22KT 3320 9766

Local storm report, Apr 29, 1:16 PM CDT, 1 hour 44 minutes before

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Special weather statement, Apr 29, 1:23 PM CDT, 1 hour 37 minutes before

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Local storm report, Apr 29, 2:05 PM CDT, 55 minutes before

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Local storm report, Apr 29, 2:53 PM CDT, 7 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
Apr 28, 7:01 PM CDT	Areal Flood Warning	FWD	Freestone	4 hr
Apr 28, 7:17 PM CDT	Areal Flood Warning	FWD	Robertson	3 hr
Apr 29, 8:43 AM CDT	River Flood Warning	FWD	Anderson, Freestone, Leon	37 hr
Apr 29, 9:26 AM CDT	Special Weather Statement	FWD	Montague	34 min
Apr 29, 10:10 AM CDT	Special Weather Statement	FWD	Montague	35 min
Apr 29, 10:17 AM CDT	Severe Thunderstorm Warning	FWD	Montague	73 min
Apr 29, 11:09 AM CDT	Flash Flood Warning	FWD	Montague	3 hr
Apr 29, 11:25 AM CDT	Special Weather Statement	FWD	Grayson	35 min
Apr 29, 11:40 AM CDT	Special Weather Statement	FWD	Cooke	20 min
Apr 29, 11:57 AM CDT	Flash Flood Warning	FWD	Cooke	3 hr
Apr 29, 12:18 PM CDT	Special Weather Statement	FWD	Grayson	27 min
Apr 29, 12:21 PM CDT	Special Weather Statement	FWD	Wise	24 min
Apr 29, 12:24 PM CDT	Flash Flood Warning	FWD	Grayson	3 hr
Apr 29, 1:23 PM CDT	Special Weather Statement	FWD	Fannin, Lamar	67 min
Apr 29, 1:47 PM CDT	Areal Flood Advisory	FWD	Fannin, Lamar	3 hr
Apr 29, 2:12 PM CDT	Areal Flood Advisory	FWD	Montague	3 hr
Apr 29, 2:35 PM CDT	Severe Thunderstorm Warning	FWD	Montague	55 min
Apr 29, 2:50 PM CDT	Flash Flood Warning	FWD	Cooke, Montague	3 hr
Apr 29, 3:09 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Wise	66 min
Apr 29, 3:29 PM CDT	Severe Thunderstorm Warning	FWD	Young	61 min
Apr 29, 3:53 PM CDT	Areal Flood Advisory	FWD	Hopkins, Hunt	3 hr
Apr 29, 4:28 PM CDT	Severe Thunderstorm Warning	FWD	Jack	62 min
Apr 29, 5:33 PM CDT	Flash Flood Warning	FWD	Cooke, Montague	3 hr
Apr 29, 5:48 PM CDT	Areal Flood Advisory	FWD	Jack, Wise	3 hr
Apr 29, 6:05 PM CDT	Areal Flood Advisory	FWD	Collin, Denton	3 hr
Apr 29, 6:10 PM CDT	River Flood Warning	FWD	Cooke	14 hr
Apr 29, 6:28 PM CDT	Special Weather Statement	FWD	Montague	32 min
Apr 29, 6:30 PM CDT	Severe Thunderstorm Warning	FWD	Montague	33 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.