Alert archive / Louisiana / Flash Flood Warnings in 2009

Flash Flood Warning 108, NWS Shreveport, LA

October 29, 20095 parishes in Louisiana; Union County, Arkansas

NWS Shreveport, LA issued this flash flood warning at Oct 29, 2009, 10:21 PM CDT for 5 parishes in Louisiana; Union County, Arkansas. It was in force for 4 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 29, 2009, 10:21 PM CDT (03:21 UTC)
Expired
Oct 30, 2009, 2:15 AM CDT
In force
4 hr
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Flood severity
None

Counties Union County, AR, Bienville Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 96 km from the middle of the area, began a volume at 03:23 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, 3.4 hours before the alert went out and 87 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-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2009-10-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1620 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2009-10-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 278 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1620 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
510 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
278 m²/s²
0-3 km storm-relative helicity
300 m²/s²
Significant tornado parameter
2.2
Supercell composite
14.3

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 Shreveport, LA wrote its last area forecast discussion before this flash flood warning went out at Oct 29, 9:31 PM CDT, 50 minutes earlier.

Area forecast discussion, Oct 29, 9:31 PM CDT, 50 minutes before
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Hazardous weather outlook, Oct 29, 11:56 AM CDT, 10 hours 25 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1156 AM CDT THU OCT 29 2009

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-301700-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-
UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA-
NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE-
FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-
HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA-
SAN AUGUSTINE-SABINE TX-
1156 AM CDT THU OCT 29 2009

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

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

AN UPPER LEVEL DISTURBANCE...COMBINED WITH A SLOW MOVING SURFACE
COLD FRONT AND RICH LOW LEVEL MOISTURE...WILL PROVIDE FOR
WIDESPREAD SHOWERS AND THUNDERSTORMS TODAY AND TONIGHT. SOME OF
THESE STORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL...DAMAGING
WINDS...AND ISOLATED TORNADOES. FLOODING WILL BE A SIGNIFICANT
CONCERN WITH RAINFALL TOTALS AVERAGING AROUND 3 TO 6 INCHES
AREAWIDE...INCLUDING ISOLATED AMOUNTS OF UP TO 7 INCHES POSSIBLE
THROUGH FRIDAY. THE MOST LIKELY LOCATING FOR THE HIGHEST RAINGALL
TOTALS WIL BE ACROSS NORTHWEST LOUISIANA.

ALTHOUGH THERE WILL BE A POTENTIAL FOR BOTH SEVERE WEATHER AND
FLOODING THIS AFTERNOON AND OVERNIGHT...THE MAIN TORNADIC THREAT
WITH BE WITH THE PREFRONTAL STORMS THIS AFTERNOON...ESPECIALLY
ACROSS NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA...IN ASSOCIATION
WITH STORMS THAT ARE CURRENTLY STILL DEVELOPING. THE MAIN THREAT
FOR SIGNIFICANT FLOODING WILL BE TONIGHT...AS WELL AS POSSIBLE
STRONG TO DAMAGING STRAIGHT LINE WINDS ASSOCIATED WITH A SLOW
MOVING SQUALL LINE ENTERING NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA
DURING THE EVENING FROM THE WEST.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

HEAVY RAIN WILL LINGER INTO MUCH OF THE DAY FRIDAY...WITH A
CONTINUED FLOODING THREAT.

.SPOTTER INFORMATION STATEMENT...
ACTIVATION OF STORM SPOTTERS WILL LIKELY BE REQUIRED THIS
AFTERNOON AND EVENING. LOCAL FLOODING ALSO POSSIBLE THIS
AFTERNOON...BECOMING MORE LIKELY AREAWIDE TONIGHT AND FRIDAY.
EMERGENCY MANAGERS NEED TO PREPARE FOR POSSIBLE SIGNIFICANT FLOODING.

VII

In the hours before

Local storm report, Oct 29, 9:26 PM CDT, 55 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
926 PM CDT THU OCT 29 2009

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

0922 PM     FLASH FLOOD      HAYNESVILLE             32.97N 93.14W
10/29/2009                   CLAIBORNE          LA   TRAINED SPOTTER

            HIGH WATER ON US HIGHWAY 79 AT HAYNESVILLE HIGH
            SCHOOL...WITH THE WATER BUMPER DEEP ON A PICKUP TRUCK.

&&

15
Local storm report, Oct 29, 9:27 PM CDT, 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
927 PM CDT THU OCT 29 2009

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

0927 PM     FLASH FLOOD      LUFKIN                  31.33N 94.73W
10/29/2009                   ANGELINA           TX   LAW ENFORCEMENT

            NUMEROUS COUNTY ROADS STILL FLOODED THROUGHOUT THE
            COUNTY. US 69 FLOODED SOUTH OF TOWN

&&

KSTELLMA
Local storm report, Oct 29, 9:30 PM CDT, 51 minutes before
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Local storm report, Oct 29, 9:40 PM CDT, 41 minutes before
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Local storm report, Oct 29, 9:46 PM CDT, 35 minutes before
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Local storm report, Oct 29, 9:56 PM CDT, 25 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Oct 29, 8:36 PM CDTFlash Flood WarningSHVAngelina, Nacogdoches, Sabine, San Augustine4 hr
Oct 29, 9:02 PM CDTFlash Flood WarningSHVHarrison, Panola, Shelby4 hr
Oct 29, 9:23 PM CDTRiver Flood WarningSHVAngelina, Cherokee, Nacogdoches5 days
Oct 30, 12:31 AM CDTFlash Flood WarningSHVAngelina, Nacogdoches, San Augustine4 hr
Oct 30, 1:00 AM CDTFlash Flood WarningSHVHarrison, Panola, Shelby4 hr
Oct 30, 4:32 AM CDTAreal Flood WarningSHVAngelina, Nacogdoches, San Augustine4 hr
Oct 30, 4:48 AM CDTAreal Flood WarningSHVHarrison, Panola, Shelby4 hr
Oct 30, 5:51 AM CDTRiver Flood WarningSHVSabine, San Augustine3 hr
Oct 30, 12:09 PM CDTRiver Flood WarningSHVSabine, San Augustine22 hr
Oct 29, 7:13 PM CDTTornado WarningSHVBossier, Webster32 min
Oct 29, 7:49 PM CDTFlash Flood WarningSHVBossier, Claiborne, Webster8 hr
Oct 29, 9:12 PM CDTRiver Flood WarningSHVBossier4 days
Oct 29, 9:13 PM CDTFlash Flood WarningSHVBossier, Caddo, De Soto4 hr
Oct 29, 9:29 PM CDTSevere Thunderstorm WarningSHVClaiborne, Union46 min
Oct 30, 12:55 AM CDTFlash Flood WarningSHVBossier, Caddo, De Soto4 hr
Oct 30, 1:30 AM CDTFlash Flood WarningSHVGrant, Jackson, Natchitoches, Ouachita, Winn7 hr
Oct 30, 2:13 AM CDTFlash Flood WarningSHVBienville, Lincoln, Red River, Union4 hr
Oct 30, 3:45 AM CDTFlash Flood WarningSHVClaiborne, Webster4 hr
Oct 30, 3:54 AM CDTRiver Flood WarningSHVCaddo, De Soto14 days
Oct 30, 4:41 AM CDTAreal Flood WarningSHVBossier, Caddo, De Soto4 hr
Oct 30, 6:15 AM CDTAreal Flood WarningSHVBienville, Claiborne, Webster60 min
Oct 30, 6:29 AM CDTFlash Flood WarningSHVBienville, Lincoln, Red River, Union3 hr
Oct 30, 7:43 AM CDTAreal Flood WarningSHVClaiborne, Webster2 hr
Oct 30, 8:31 AM CDTAreal Flood WarningSHVBienville, Caldwell, Grant, Jackson, LaSalle, Lincoln and 6 more3 hr
Oct 30, 9:55 AM CDTRiver Flood WarningSHVBossier, Caddo, Red River23 hr
Oct 30, 11:14 AM CDTRiver Flood WarningSHVCaldwell, Ouachita31 days
Oct 30, 11:38 AM CDTRiver Flood WarningSHVClaiborne, Lincoln, Union35 hr
Oct 29, 8:09 PM CDTTornado WarningSHVColumbia, Union36 min

Nearby

Flash Flood Warnings in Louisiana, 2009Flash Flood Warnings in Arkansas, 2009Every 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.