Alert archive / Louisiana / Flash Flood Warnings in 2009

Flash Flood Warning 104, NWS Shreveport, LA

October 29, 2009Bossier Parish, Claiborne Parish, Webster Parish, Louisiana; Columbia County, Union County, Arkansas

NWS Shreveport, LA issued this flash flood warning at Oct 29, 2009, 7:49 PM CDT for Bossier Parish, Claiborne Parish, Webster Parish, Louisiana; Columbia County, Union County, Arkansas. It was in force for 8 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, 7:49 PM CDT (00:49 UTC)
Expired: Oct 30, 2009, 3:45 AM CDT
In force: 8 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Columbia County, AR, Union County, AR, Bossier Parish, LA, Claiborne Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 83 km from the middle of the area, began a volume at 00:50 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, 0.8 hours before the alert went out and 74 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: 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, 7:20 PM CDT, 29 minutes earlier.

Area forecast discussion, Oct 29, 7:20 PM CDT, 29 minutes before

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Hazardous weather outlook, Oct 29, 11:56 AM CDT, 7 hours 53 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, 6:55 PM CDT, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
655 PM CDT THU OCT 29 2009

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

0650 PM     TSTM WND GST     SHREVEPORT              32.47N 93.80W
10/29/2009  E60.00 MPH       CADDO              LA   TRAINED SPOTTER

            60 MPH WIND GUST ESTIMATED IN SOUTH SHREVEPORT JUST EAST
            OF KINGSTON RD/SOUTH OF BERT KOUNS.

0650 PM     FLASH FLOOD      SHREVEPORT              32.47N 93.80W
10/29/2009                   CADDO              LA   TRAINED SPOTTER

            OVER ONE FOOT OF WATER AT THE INTERSECTION OF MELBA AND
            PINE GROVE ST.

&&

15

Local storm report, Oct 29, 7:11 PM CDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
711 PM CDT THU OCT 29 2009

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

0709 PM     FLASH FLOOD      SHREVEPORT              32.47N 93.80W
10/29/2009                   CADDO              LA   FIRE DEPT/RESCUE

            YOUREE DRIVE FROM OCKLEY TO SOUTHERN FLOODED. BOTH LANES
            ALL THE WAY ACROSS

0709 PM     FLASH FLOOD      SHREVEPORT              32.47N 93.80W
10/29/2009                   CADDO              LA   FIRE DEPT/RESCUE

            FLOODED STREET WITH STALLED VEHICLE. HOLLYWOOD NEAR FIRE
            STATION 16

&&

KSTELLMA

Local storm report, Oct 29, 7:19 PM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
719 PM CDT THU OCT 29 2009

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

0713 PM     TSTM WND DMG     5 SW TEXARKANA          33.40N 94.08W
10/29/2009                   BOWIE              TX   EMERGENCY MNGR

            TWO CARS BLOWN OFF HWY. 59 IN THE LIBERTY-EYLAU
            COMMUNITY.

&&

MBERRY

Local storm report, Oct 29, 7:20 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
720 PM CDT THU OCT 29 2009

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

0720 PM     FLASH FLOOD      1 S SHREVEPORT          32.46N 93.80W
10/29/2009                   CADDO              LA   FIRE DEPT/RESCUE

            STONER DRIVE UNDER 3 FEET OF WATER NEAR CENTENARY

&&

KSTELLMA

Local storm report, Oct 29, 7:27 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
727 PM CDT THU OCT 29 2009

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

0727 PM     FLASH FLOOD      TENAHA                  31.94N 94.24W
10/29/2009                   SHELBY             TX   TRAINED SPOTTER

            HWY 59 CLOSED TO ALL TRAFFIC FROM TENAHA TO TIMPSON.
            TRAFFIC WAS DIVERTED TO 87 BUT 87 NOW CLOSED AS WELL

&&

KSTELLMA

Local storm report, Oct 29, 7:31 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
731 PM CDT THU OCT 29 2009

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

0730 PM     FLASH FLOOD      SHREVEPORT              32.47N 93.80W
10/29/2009                   CADDO              LA   NWS EMPLOYEE

            2 FEET OF WATER OVER CROOKED CREEK DR JUST OFF OF
            FLOURNOY LUCAS RD IN SOUTH SHREVEPORT

&&

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 29, 8:36 PM CDT	Flash Flood Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	4 hr
Oct 29, 9:02 PM CDT	Flash Flood Warning	SHV	Harrison, Panola, Shelby	4 hr
Oct 29, 9:23 PM CDT	River Flood Warning	SHV	Angelina, Cherokee, Nacogdoches	5 days
Oct 30, 12:31 AM CDT	Flash Flood Warning	SHV	Angelina, Nacogdoches, San Augustine	4 hr
Oct 30, 1:00 AM CDT	Flash Flood Warning	SHV	Harrison, Panola, Shelby	4 hr
Oct 30, 4:32 AM CDT	Areal Flood Warning	SHV	Angelina, Nacogdoches, San Augustine	4 hr
Oct 30, 4:48 AM CDT	Areal Flood Warning	SHV	Harrison, Panola, Shelby	4 hr
Oct 30, 5:51 AM CDT	River Flood Warning	SHV	Sabine, San Augustine	3 hr
Oct 30, 12:09 PM CDT	River Flood Warning	SHV	Sabine, San Augustine	22 hr
Oct 29, 7:13 PM CDT	Tornado Warning	SHV	Bossier, Webster	32 min
Oct 29, 9:12 PM CDT	River Flood Warning	SHV	Bossier	4 days
Oct 29, 9:13 PM CDT	Flash Flood Warning	SHV	Bossier, Caddo, De Soto	4 hr
Oct 29, 9:29 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	46 min
Oct 29, 10:21 PM CDT	Flash Flood Warning	SHV	Bienville, Claiborne, Lincoln, Red River, Union	4 hr
Oct 30, 12:55 AM CDT	Flash Flood Warning	SHV	Bossier, Caddo, De Soto	4 hr
Oct 30, 1:30 AM CDT	Flash Flood Warning	SHV	Grant, Jackson, Natchitoches, Ouachita, Winn	7 hr
Oct 30, 2:13 AM CDT	Flash Flood Warning	SHV	Bienville, Lincoln, Red River, Union	4 hr
Oct 30, 3:45 AM CDT	Flash Flood Warning	SHV	Claiborne, Webster	4 hr
Oct 30, 3:54 AM CDT	River Flood Warning	SHV	Caddo, De Soto	14 days
Oct 30, 4:41 AM CDT	Areal Flood Warning	SHV	Bossier, Caddo, De Soto	4 hr
Oct 30, 6:15 AM CDT	Areal Flood Warning	SHV	Bienville, Claiborne, Webster	60 min
Oct 30, 6:29 AM CDT	Flash Flood Warning	SHV	Bienville, Lincoln, Red River, Union	3 hr
Oct 30, 7:43 AM CDT	Areal Flood Warning	SHV	Claiborne, Webster	2 hr
Oct 30, 8:31 AM CDT	Areal Flood Warning	SHV	Bienville, Caldwell, Grant, Jackson, LaSalle, Lincoln and 6 more	3 hr
Oct 30, 9:55 AM CDT	River Flood Warning	SHV	Bossier, Caddo, Red River	23 hr
Oct 30, 11:14 AM CDT	River Flood Warning	SHV	Caldwell, Ouachita	31 days
Oct 30, 11:38 AM CDT	River Flood Warning	SHV	Claiborne, Lincoln, Union	35 hr
Oct 29, 8:09 PM CDT	Tornado Warning	SHV	Columbia, Union	36 min

Nearby

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