Alert archive / Louisiana / Flash Flood Warnings in 2009

Flash Flood Warning 94, NWS Shreveport, LA

October 15, 20094 parishes in Louisiana

NWS Shreveport, LA issued this flash flood warning at Oct 15, 2009, 10:33 AM CDT for 4 parishes in Louisiana. It was in force for 3 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 15, 2009, 10:33 AM CDT (15:33 UTC)
Expired: Oct 15, 2009, 1:30 PM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 132 km from the middle of the area, began a volume at 15:32 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 12:00Z, 3.6 hours before the alert went out and 123 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: 2278 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 9.6

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 15, 7:32 AM CDT, 3 hours 1 minute earlier.

Area forecast discussion, Oct 15, 7:32 AM CDT, 3 hours 1 minute before

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Hazardous weather outlook, Oct 15, 6:18 AM CDT, 4 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
618 AM CDT THU OCT 15 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>167-151700-
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-
618 AM CDT THU OCT 15 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...TODAY AND TONIGHT...

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP AND
SPREAD SOUTHEAST ACROSS NORTHEAST TEXAS...SOUTHWEST ARKANSAS...
AND THEN NORTHEAST TEXAS AND NORTHWEST AND AND NORTH CENTRAL
LOUISIANA INTO THE MORNING HOURS. BY THE AFTERNOON THE RAIN WILL
SHIFT TO THE SOUTHEAST INTO EAST TEXAS AND ACROSS PARTS OF NORTHWEST
AND NORTH CENTRAL LOUISIANA ALONG AND SOUTH OF THE INTERSTATE
20 CORRIDOR. WITH AMPLE LOW LEVEL MOISTURE...SOME HEATING...AND
ADDITIONAL LIFT WITH A COLD FRONT...STRONG TO SEVERE
THUNDERSTORMS WILL BE POSSIBLE. THE MAIN CONCERN WILL BE HIGH AND
POSSIBLY DAMAGING WINDS FOLLOWED BY LOCALLY HEAVY RAINFALL
PRODUCING RAPID WATER RUNOFF AND FLOODING.

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

MUCH COOLER AND DRIER AIR WILL SPILL SOUTH BEHIND THE COLD FRONT
SOME OF THE COOLER TEMPERATURES SO FAR THIS SEASON. NO HAZARDOUS
WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGERS...STORM SPOTTER NETWORKS...AND
HAM RADIO OPERATORS...MAY BE NEEDED TODAY AND EARLY
TONIGHT.

06

In the hours before

Local storm report, Oct 15, 4:41 AM CDT, 5 hours 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
441 AM CDT THU OCT 15 2009

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

0330 AM     LIGHTNING        VALLIANT                34.00N 95.09W
10/15/2009                   MCCURTAIN          OK   LAW ENFORCEMENT

            LIGHTNING HIT BARN AND STARTED A FIRE.

&&

ASTEVENS

Local storm report, Oct 15, 4:44 AM CDT, 5 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
444 AM CDT THU OCT 15 2009

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

0410 AM     FUNNEL CLOUD     10 S IDABEL             33.76N 94.82W
10/15/2009                   MCCURTAIN          OK   AMATEUR RADIO

            MOVING SOUTHEAST.

&&

ASTEVENS

Special weather statement, Oct 15, 4:52 AM CDT, 5 hours 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
452 AM CDT THU OCT 15 2009

ARZ060-061-151030-
HEMPSTEAD-NEVADA-
452 AM CDT THU OCT 15 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 530 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     NEVADA AND HEMPSTEAD...

INCLUDING THE FOLLOWING LOCATIONS...
     BLEVINS...EMMET...PERRYTOWN AND PRESCOTT...

AT 451 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A STRONG THUNDERSTORM 8 MILES WEST OF BLEVINS...OR 8 MILES EAST OF
NASHVILLE...MOVING SOUTHEAST AT 25 MPH.

PEA SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

13

Special weather statement, Oct 15, 6:47 AM CDT, 3 hours 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
647 AM CDT THU OCT 15 2009

ARZ060-070-071-151245-
HEMPSTEAD-LAFAYETTE-MILLER-
647 AM CDT THU OCT 15 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 745 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     HEMPSTEAD...LAFAYETTE AND MILLER...

INCLUDING THE FOLLOWING LOCATIONS...
     BUCKNER...FULTON...GARLAND...GENOA...HOPE...LEWISVILLE...
     MANDEVILLE...PERRYTOWN...STAMPS AND TEXARKANA...

AT 645 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A STRONG THUNDERSTORM 6 MILES EAST OF OGDEN...OR 9 MILES NORTHEAST OF
TEXARKANA...MOVING EAST AT 30 MPH.

DIME SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

22

Special weather statement, Oct 15, 7:46 AM CDT, 2 hours 47 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 14, 8:46 PM CDT	River Flood Warning	SHV	Gregg, Harrison, Marion, Upshur	63 hr
Oct 15, 3:29 AM CDT	Severe Thunderstorm Warning	SHV	Red River	46 min
Oct 15, 3:43 AM CDT	Tornado Warning	SHV	Red River	47 min
Oct 15, 4:29 AM CDT	Tornado Warning	SHV	Bowie, Red River	46 min
Oct 15, 5:55 AM CDT	Flash Flood Watch	SHV	Angelina, Bowie, Cass, Harrison, Marion, Nacogdoches and 4 more	10 hr
Oct 15, 6:14 AM CDT	Severe Thunderstorm Warning	SHV	Bowie	46 min
Oct 15, 7:59 AM CDT	Severe Thunderstorm Warning	SHV	Union	46 min
Oct 15, 8:18 AM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union, Webster	57 min
Oct 15, 8:51 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Lincoln, Union	39 min
Oct 15, 5:08 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	37 min
Oct 15, 5:31 AM CDT	Severe Thunderstorm Warning	SHV	Little River, Sevier	44 min
Oct 15, 6:41 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	64 min
Oct 15, 7:11 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Lafayette, Miller, Nevada	64 min
Oct 15, 7:20 AM CDT	Flash Flood Warning	SHV	Columbia, Hempstead, Lafayette, Miller, Nevada, Union	3 hr
Oct 15, 7:41 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette	64 min

Nearby

Flash Flood Warnings in Louisiana, 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.