Alert archive / Texas / Flash Flood Warnings in 2009

Flash Flood Warning 97, NWS Fort Worth, TX

October 21, 20095 counties in Texas

NWS Fort Worth, TX issued this flash flood warning at Oct 21, 2009, 9:12 PM CDT for 5 counties in Texas. It was in force for 5 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: Oct 21, 2009, 9:12 PM CDT (02:12 UTC)
Expired: Oct 22, 2009, 2:15 AM CDT
In force: 5 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

Counties Denton County, TX, Hood County, TX, Johnson County, TX, Somervell County, TX, Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 17 km from the middle of the area, began a volume at 02:12 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, 2.2 hours before the alert went out and 31 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: 245 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 477 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 425 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Oct 21, 6:16 PM CDT, 2 hours 56 minutes earlier.

Area forecast discussion, Oct 21, 6:16 PM CDT, 2 hours 56 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
616 PM CDT WED OCT 21 2009

.AVIATION...
WV LOOP SHOWS SYSTEM SPINNING OVER NE NM/SE CO WITH NEAR
CONTINUOUS RAIN...SOME SHOWERS...AND MAYBE AN ISOLATED
THUNDERSTORMS (NON- SEVERE) SPREADING ACROSS THE HEART OF TEXAS AS
STRONG SYNOPTIC LIFT APPROACHES FROM THE WEST. CIGS WILL BE
BOUNCING AROUND THIS EVENING...BUT FEEL IT IS BEST TO KEEP THEM
IFR ACROSS THE KDFW TRACON UNTIL 05Z. KACT TRACON MAY SEE SOME IFR
CIGS/VIS...BUT LOW MVFR IS BEST CALL ATTM. LATE TONIGHT... A
BROKEN LINE OF TSRA EXPECTED TO PROCEED/ALONG THE COLD FRONT AS IT
MOVES ACROSS THE REGION 08-14Z. EXPECTED MVFR CIGS/VIS AS THE COLD
FRONT ARRIVES AND JUST AFTER...THEN TRENDING TO VFR CIGS AROUND
5KFT IN THE LATE MORNING. TURNING VFR WITH NORTHWEST WINDS 15G25
THROUGHOUT THE AFTERNOON HOURS. 75

&&

.PREV DISCUSSION... /ISSUED 302 PM CDT WED OCT 21 2009/
WET WEATHER WILL CONTINUE INTO THIS EVENING AND TONIGHT AS STRONG
LOW LEVEL WARM ADVECTION CONTINUES AHEAD OF S/W TROF THAT WILL
MOVE THROUGH TONIGHT. LARGE AREA OF MODERATE TO HEAVY RAINFALL
CONTINUES ALONG AND EAST OF INTERSTATE 35 WITH ADDITIONAL SHOWERS
AND EMBEDDED THUNDERSTORMS EXTENDING FROM SURFACE LOW ACROSS
WESTERN OKLAHOMA INTO WEST CENTRAL TEXAS. WESTERN HALF OF THE CWA
IS GETTING A BREAK IN THE RAINFALL THIS AFTERNOON...BUT THIS AREA
SHOULD FILL IN THIS EVENING...WITH MODERATE TO HEAVY RAINFALL AND
A FEW THUNDERSTORMS EXPECTED TO MOVE ACROSS ALL OF NORTH TEXAS
TONIGHT. WILL CONTINUE WITH 100 POPS FOR MOST OF THE AREA TONIGHT.
COLD FRONT SHOULD BE APPROACHING THE METROPLEX AROUND MIDNIGHT OR
SHORTLY THEREAFTER WITH RAIN COMING TO AN END BEHIND THE SYSTEM
FROM WEST TO EAST.

FLASH FLOOD WATCH WILL REMAIN IN EFFECT THROUGH TONIGHT. SEVERAL
AREAS HAVE ALREADY PICKED UP BETWEEN 1 AND 2 INCHES OF RAIN...WITH
AN ADDITIONAL 1 TO 3 INCHES OF RAIN EXPECTED LATER THIS EVENING
AND TONIGHT. AREAS ALONG AND EAST OF I-35 WILL HAVE THE HIGHEST
THREAT FOR FLOODING. THE OVERALL SEVERE THREAT CONTINUES TO BE
LOW. LOW LEVEL SHEAR IS MODEST BUT DEEP SURFACE BASED CONVECTION
IS UNLIKELY GIVEN VERY WEAK INSTABILITY ACROSS THE REGION.

RAIN CHANCES END BY LATE IN THE MORNING THURSDAY ACROSS THE
EASTERN HALF OF THE CWA AS THE FRONT CLEARS THE AREA. HIGHS SHOULD
REMAIN IN THE LOW TO MID 60S WITH NORTHWEST WINDS. TEMPS WILL WARM
INTO THE 70S THROUGH THE END OF THE WEEK...WITH THE NEXT
DISTURBANCE CROSSING THE AREA TOWARD THE LATTER PART OF THE
UPCOMING WEEKEND. WILL MAINTAIN THE 20 POPS IN THE FORECAST FOR
LATE SUNDAY AND MONDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH, TX  58  64  46  70  48 / 100  20   5   5   5
WACO, TX              60  67  49  72  48 / 100  30   5   5   5
PARIS, TX             61  64  42  64  44 / 100  60  10   5   5
DENTON, TX            55  64  43  68  43 / 100  20   5   5   5
MCKINNEY, TX          58  64  44  67  44 / 100  30  10   5   5
DALLAS, TX            59  64  47  71  50 / 100  20   5   5   5
TERRELL, TX           61  65  46  70  46 / 100  40  10   5   5
CORSICANA, TX         63  67  46  70  48 / 100  50  10   5   5
TEMPLE, TX            62  68  48  71  47 / 100  30   5   5   5

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL 6 AM CDT THURSDAY FOR TXZ091>095-102>107-
117>123-131>135-144>148-157>162-174-175.

&&

75/

Hazardous weather outlook, Oct 21, 7:35 PM CDT, 1 hour 37 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
735 PM CDT WED OCT 21 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-230045-
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-
735 PM CDT WED OCT 21 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TONIGHT.

A FLASH FLOOD WATCH IS IN EFFECT THROUGH 6 AM THURSDAY MORNING ALONG
AND EAST OF A LINE FROM BOWIE TO WEATHERFORD AND COPPERAS COVE.

HEAVY RAINFALL IS LIKELY ACROSS A LARGE PORTION OF NORTH TEXAS TONIGHT
WITH TOTALS OF 1 TO 3 INCHES AND ISOLATED AMOUNTS IN EXCESS OF 4
INCHES. FLASH FLOODING IS EXPECTED.

ISOLATED THUNDERSTORMS ARE ALSO POSSIBLE LATE TONIGHT...BUT NO
SEVERE WEATHER IS EXPECTED.

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

THUNDERSTORMS WILL TAPER OFF FROM WEST TO EAST THURSDAY AS A COLD
FRONT SWEEPS THROUGH NORTH TEXAS. SOME LOCALLY HEAVY RAINFALL MAY
STILL BE POSSIBLE ACROSS FAR EASTERN NORTH TEXAS THROUGH MID-
MORNING.

LOW THUNDERSTORM CHANCES WILL RETURN SUNDAY NIGHT AND MONDAY...AS
ANOTHER COLD FRONT AND DISTURBANCE ALOFT AFFECT THE AREA.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUESTED FOR FLOODING PROBLEMS.

In the hours before

Local storm report, Oct 21, 6:04 PM CDT, 3 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
604 PM CDT WED OCT 21 2009

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0601 PM     FLASH FLOOD      HALTOM CITY             32.80N  97.27W
10/21/2009                   TARRANT            TX   LAW ENFORCEMENT

            TWO VEHICLES STUCK IN HIGH WATER. RESCUE IN PROGRESS.
            ROAD BEING CLOSED.

Local storm report, Oct 21, 6:10 PM CDT, 3 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE FORT WORTH TX
610 PM CDT WED OCT 21 2009

CORRECTED CITY AND LAT.LON

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0601 PM     FLASH FLOOD      FORT WORTH              32.79N  97.34W
10/21/2009                   TARRANT            TX   LAW ENFORCEMENT

            TWO VEHICLES STUCK IN HIGH WATER. RESCUE IN PROGRESS.
            ROAD BEING CLOSED.

Local storm report, Oct 21, 6:19 PM CDT, 2 hours 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
619 PM CDT WED OCT 21 2009

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0605 PM     FLASH FLOOD      FORT WORTH              32.75N  97.34W
10/21/2009                   TARRANT            TX   LAW ENFORCEMENT

            CAR STALLED...ROAD CLOSING ON NORTH SIDE DRIVE AT COLD
            SPRINGS

Local storm report, Oct 21, 6:24 PM CDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
624 PM CDT WED OCT 21 2009

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0623 PM     FLASH FLOOD      WATAUGA                 32.85N  97.27W
10/21/2009                   TARRANT            TX   NWS EMPLOYEE

            MULTILPLE ROADS CLOSED DUE TO HIGH WATER IN WATAGUA

Local storm report, Oct 21, 8:22 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
822 PM CDT WED OCT 21 2009

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0820 PM     FLASH FLOOD      SHERMAN                 33.63N  96.57W
10/21/2009                   GRAYSON            TX   LAW ENFORCEMENT

            NUMEROUS ROADS AROUND GRAYSON COUNTY CLOSED DUE TO HIGH
            WATER

Local storm report, Oct 21, 8:46 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
846 PM CDT WED OCT 21 2009

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0843 PM     FLASH FLOOD      WHITESBORO              33.65N  96.92W
10/21/2009                   GRAYSON            TX   BROADCAST MEDIA

            HIGH WATER ALONG HIGHWAY 377 IN WHITESBORO WITH HIGH
            WATER RESCUES FROM 2 VEHICLES

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 7:03 PM CDT	Areal Flood Advisory	FWD	Cooke, Grayson	3 hr
Oct 21, 7:15 PM CDT	Flash Flood Warning	FWD	Collin, Cooke, Grayson	3 hr
Oct 21, 8:35 PM CDT	Areal Flood Advisory	FWD	Comanche, Eastland, Erath, Hood, Jack, Montague and 5 more	115 min
Oct 21, 9:20 PM CDT	River Flood Warning	FWD	Dallas	70 hr
Oct 21, 9:34 PM CDT	River Flood Warning	FWD	Collin	37 hr
Oct 21, 10:10 PM CDT	River Flood Warning	FWD	Hunt, Rockwall	35 hr
Oct 21, 10:11 PM CDT	Flash Flood Warning	FWD	Grayson	3 hr
Oct 21, 10:35 PM CDT	Areal Flood Advisory	FWD	Collin, Dallas, Denton, Rockwall	3 hr
Oct 21, 10:41 PM CDT	Areal Flood Advisory	FWD	Anderson, Dallas, Henderson, Kaufman, Navarro, Rains and 2 more	3 hr
Oct 21, 10:51 PM CDT	Flash Flood Warning	FWD	Cooke, Montague	114 min
Oct 21, 11:06 PM CDT	Areal Flood Advisory	FWD	Coryell, Lampasas	3 hr
Oct 21, 11:11 PM CDT	Areal Flood Advisory	FWD	Delta, Fannin, Hopkins, Hunt, Lamar	3 hr
Oct 22, 12:26 AM CDT	River Flood Warning	FWD	Denton	27 hr
Oct 22, 12:43 AM CDT	Areal Flood Advisory	FWD	Bosque, Hill, Johnson, McLennan, Somervell	3 hr
Oct 22, 1:25 AM CDT	Flash Flood Warning	FWD	Bosque, Coryell, Hamilton, Hill, Lampasas, McLennan	3 hr
Oct 22, 1:46 AM CDT	Areal Flood Advisory	FWD	Dallas, Ellis, Navarro	119 min
Oct 22, 1:46 AM CDT	River Flood Warning	FWD	Wise	46 hr
Oct 22, 2:02 AM CDT	Areal Flood Advisory	FWD	Anderson, Henderson, Rains, Van Zandt	118 min
Oct 22, 3:09 AM CDT	Areal Flood Advisory	FWD	Hood, Johnson, Parker, Somervell, Tarrant	111 min
Oct 22, 3:39 AM CDT	River Flood Warning	FWD	Coryell	10 hr
Oct 22, 3:59 AM CDT	River Flood Warning	FWD	Lampasas	6 hr
Oct 22, 4:35 AM CDT	Areal Flood Advisory	FWD	Bell, Bosque, Coryell, Hill, Lampasas, McLennan	3 hr
Oct 22, 4:37 AM CDT	Areal Flood Advisory	FWD	Bell, Bosque, Hill, Lampasas, McLennan	3 hr
Oct 22, 4:38 AM CDT	Flash Flood Warning	FWD	Coryell	4 hr
Oct 22, 4:52 AM CDT	Flash Flood Warning	FWD	Bosque, Hill	113 min
Oct 22, 5:01 AM CDT	Areal Flood Advisory	FWD	Johnson	3 hr
Oct 22, 5:23 AM CDT	River Flood Warning	FWD	Navarro	63 hr
Oct 22, 5:23 AM CDT	River Flood Warning	FWD	Henderson, Navarro	15 days
Oct 22, 5:53 AM CDT	River Flood Warning	FWD	Coryell	22 hr
Oct 22, 6:43 AM CDT	Flash Flood Warning	FWD	Bosque	2 hr
Oct 22, 7:26 AM CDT	River Flood Warning	FWD	Hunt	25 hr
Oct 22, 8:05 AM CDT	River Flood Warning	FWD	McLennan	86 min
Oct 22, 8:34 AM CDT	Areal Flood Warning	FWD	Bell, Falls	4 hr
Oct 22, 8:40 AM CDT	Areal Flood Warning	FWD	Johnson	4 hr
Oct 22, 8:46 AM CDT	Areal Flood Warning	FWD	Bosque, Coryell, Hill, McLennan	4 hr
Oct 22, 9:13 AM CDT	Areal Flood Warning	FWD	Cooke	3 hr
Oct 22, 9:29 AM CDT	Areal Flood Warning	FWD	Anderson	14 hr
Oct 22, 9:49 AM CDT	River Flood Warning	FWD	Dallas, Tarrant	11 hr
Oct 22, 9:49 AM CDT	River Flood Warning	FWD	Collin	12 hr
Oct 22, 11:08 AM CDT	River Flood Warning	FWD	Ellis, Kaufman	23 hr

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.