Alert archive / Louisiana / Flash Flood Warnings in 2007

Flash Flood Warning 58, NWS Shreveport, LA

July 11, 2007Webster Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Jul 11, 2007, 7:56 PM CDT for Webster Parish, Louisiana. It was in force for 94 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: Jul 11, 2007, 7:56 PM CDT (00:56 UTC)
Expired: Jul 11, 2007, 9:30 PM CDT
In force: 94 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Webster Parish, LA

The radar

The Shreveport radar (KSHV), 56 km from the middle of the area, began a volume at 00:57 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

Shreveport, LA (KSHV), launched 00:00Z, 0.9 hours before the alert went out and 47 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: 651 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1768 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KSHV 120058
FFWSHV
LAC119-120230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
756 PM CDT WED JUL 11 2007

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEBSTER PARISH IN NORTHWEST LOUISIANA...
  THIS INCLUDES THE CITY OF MINDEN...

* UNTIL 930 PM CDT

* AT 752 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM A CLUSTER OF THUNDERSTORM 9 MILES WEST OF 
  SIBLEY...OR ABOUT 10 MILES WEST OF MINDEN...MOVING EAST AT 5 MPH.
  RAINFALL AMOUNTS OF 2 TO 3 INCHES MAY OCCUR DURING THE NEXT HOUR.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DOYLINE...DIXIE INN...DORCHEAT...LONG SPRINGS...GILARK...SHREVEPORT
  JUNCTION...DUBBERLY AND NINE FORKS.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND. 

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SHREVEPORT.

LAT...LON 3248 9343 3247 9316 3270 9320 3266 9343

$$

24

1 follow-up statement

000 
WGUS74 KSHV 120156
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
856 PM CDT WED JUL 11 2007

LAC119-120206-
WEBSTER LA-
856 PM CDT WED JUL 11 2007

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WEBSTER PARISH...AS 
THE HEAVY THUNDERSTORM RAINS HAVE ENDED.

LAT...LON 3248 9343 3247 9316 3270 9320 3266 9343

$$

24

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 Shreveport, LA wrote its last area forecast discussion before this flash flood warning went out at Jul 11, 3:30 PM CDT, 4 hours 26 minutes earlier.

Area forecast discussion, Jul 11, 3:30 PM CDT, 4 hours 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
330 PM CDT WED JUL 11 2007

.DISCUSSION...

NORTHWEST FLOW SETTING UP ALOFT AS SHEAR AXIS MOVES EAST OF THE
AREA. A LITTLE CONVECTION IS TRYING TO GET STARTED ACROSS THE I20
CORRIDOR OF LOUISIANA...AND THE I30 CORRIDOR OF NORTH EAST
TEXAS THIS AFTERNOON. THIS IS HAPPENING WHERE MID LEVEL MOISTURE
AND A WEAK VORTICITY AREA LINGERS BEHIND THE SHEAR AXIS. LOOK FOR
DECENT BOUNDARY LAYER MOISTURE TO BE AROUND THROUGHOUT THE SHORT
TERM...BUT THERE MAY BE SOME DRYING IN THE MID TO UPPER LEVELS. 20
CENTS WILL BE COMMON IN THE SHORT TERM FORECAST...BUT RAIN CHANCES
GO UP A LITTLE FRIDAY NIGHT AS MODELS FLOAT A POSSIBLE MCS TOWARD
THE AREA. FORECASTED TEMPS IN THE MID 90S FOR TOMORROW TAKE HEAT
INDICES TO NEAR 100 DEGREES. ALTHOUGH THIS DOES NOT MEET THE HEAT
ADVISORY CRITERIA OF 105...IT MAY BE WORTH SOME MEDIA MENTIONING.

ELEVEN

&&

.AVIATION...

SCATTERED TSTMS DEVELOPING ALONG CONVERGENCE BOUNDARY FROM JUST
SOUTH OF MLU TO SHV THEN NORTHWEST TO PRX. STORMS SHOULD DISSIPATE
AFTER SUNSET. OUTSIDE OF CONVECTION MOSTLY VFR. SOME MVFR CIGS AGAIN
POSSIBLE FROM 12/08Z THROUGH 12/15Z ALONG WITH VSBYS 3-5 MI IN FOG.
WINDS SOUTHWEST AROUND 10 KT DEEP EAST TEXAS AND WEST TO NORTHWEST
10 KTS REMAINDER OF AREA. WINDS BECOMING MOSTLY LIGHT AND VARIABLE
AFTER 12/01Z. /14/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  75  96  75  94 /  20  20  20  20
MLU  74  94  75  92 /  20  20  20  20
DEQ  70  92  72  89 /  20  20  20  30
TXK  73  93  74  91 /  20  20  20  20
ELD  73  94  74  91 /  20  20  20  20
TYR  75  94  76  92 /  20  20  20  20
GGG  75  95  75  93 /  20  20  20  20
LFK  75  96  76  94 /  20  20  20  20

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
LA...NONE.
OK...NONE.
TX...NONE.
&&

11/14

Hazardous weather outlook, Jul 11, 12:00 PM CDT, 7 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 PM CDT WED JUL 11 2007

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-121200-
ANGELINA-BIENVILLE-BOSSIER-BOWIE-CADDO-CALDWELL-CAMP-CASS-CHEROKEE-
CLAIBORNE-COLUMBIA-DE SOTO-FRANKLIN-GRANT-GREGG-HARRISON-HEMPSTEAD-
HOWARD-JACKSON-LA SALLE-LAFAYETTE-LINCOLN-LITTLE RIVER-MARION-
MCCURTAIN-MILLER-MORRIS-NACOGDOCHES-NATCHITOCHES-NEVADA-OUACHITA-
PANOLA-RED RIVER LA-RED RIVER TX-RUSK-SABINE LA-SABINE TX-
SAN AUGUSTINE-SEVIER-SHELBY-SMITH-TITUS-UNION AR-UNION LA-UPSHUR-
WEBSTER-WINN-WOOD-
1200 PM CDT WED JUL 11 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST OKLAHOMA...NORTHEAST
TEXAS...SOUTHWEST ARKANSAS...NORTHWEST AND NORTH CENTRAL LOUISIANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

ISOLATED TO WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL BE
POSSIBLE THIS AFTERNOON...AS MOISTURE AND HEATING...COMBINE WITH A
WEAK UPPER LEVEL FEATURE OVER THE FOUR STATE AREA. HOWEVER...NO
HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

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

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ACROSS
SOUTHEAST OKLAHOMA AND SOUTHWEST ARKANSAS LATE THURSDAY
AFTERNOON...AND AGAIN THURSDAY NIGHT...AS A WEAK SURFACE FRONT
AND ASSOCIATED UPPER LEVEL DISTURBANCE DRIFT SOUTH TOWARDS THE RED
RIVER VALLEY. THESE SHOWERS AND THUNDERSTORMS WILL AFFECT PORTIONS
OF NORTHEAST TEXAS AND NORTH LOUISIANA FRIDAY...AND COULD BE
ENHANCED FURTHER WITH DAYTIME HEATING. ISOLATED SEVERE THUNDERSTORMS
CAN NOT BE RULED OVER THE AREA FRIDAY AND FRIDAY EVENING...WITH
DAMAGING WINDS THE PRIMARY THREAT. HOWEVER...ANY STORM THAT DEVELOPS
WILL HAVE THE POTENTIAL FOR PRODUCING LOCALLY HEAVY RAINFALL AND
DEADLY CLOUD TO GROUND LIGHTNING.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL...WILL NOT BE NEEDED THIS
AFTERNOON OR TONIGHT.

11

In the hours before

Local storm report, Jul 11, 6:28 PM CDT, 1 hour 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
628 PM CDT WED JUL 11 2007

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

0626 PM     FLASH FLOOD      OMAHA                   33.18N 94.74W
07/11/2007                   MORRIS             TX   LAW ENFORCEMENT

            HIGH WATER AT INTERSECTION OF US 67 AND US 259

&&

12

Local storm report, Jul 11, 6:32 PM CDT, 1 hour 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
632 PM CDT WED JUL 11 2007

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

0626 PM     FLASH FLOOD      DAINGERFIELD            33.03N 94.72W
07/11/2007                   MORRIS             TX   LAW ENFORCEMENT

            HIGH WATER ON US 259 IN THE CITY

&&

12

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 11:43 AM CDT	River Flood Warning	SHV	Caddo	6 days
Jul 12, 12:12 PM CDT	River Flood Warning	SHV	De Soto	27 hr

Nearby

Flash Flood Warnings in Louisiana, 2007 Every flash flood warning in 2007

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.