Alert archive / Louisiana / Flash Flood Warnings in 2009
Flash Flood Warning 30, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood warning at May 11, 2009, 11:55 AM CDT for Bossier Parish, Caddo Parish, Louisiana. It was in force for 2 hr. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 11, 2009, 11:55 AM CDT (16:55 UTC)
- Expired
- May 11, 2009, 2:15 PM CDT
- In force
- 2 hr
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bossier Parish, LA, Caddo Parish, LA
The radar
The Shreveport radar (KSHV), 24 km from the middle of the area, began a volume at 16:58 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 12:15 PM CDT | FLASH FLOOD | Shreveport, LA | BUNCOMBE RD NEAR FINANCIAL PLAZA UNDER ABOUT 6 INCHES OF WATER...HOLLYWOOD AVE AND GREENWOOD RD WEST OF MONKHOUSE AVE ARE BOTH UNDER WATER. |
| May 11, 12:30 PM CDT | FLASH FLOOD | 3 Ne Bossier City, LA | WATER UP TO PORCHES NEAR I 220 AND SHED RD. |
| May 11, 12:30 PM CDT | FLASH FLOOD | Shreveport, LA | 2 WOMEN AND A MONTH OLD BABY BOY HAD TO BE RESCUED FROM WAIST HIGH DEEP WATER AT THE INTERSECTION OF HOLLYWOOD AVE. AND KENNEDY ST. NO INJURIES. |
| May 11, 12:45 PM CDT | FLASH FLOOD | Greenwood, LA | HOMES THREATENED BY HIGH WATER ALONG KELLY LANE IN GREENWOOD |
| May 11, 12:45 PM CDT | FLASH FLOOD | Shreveport, LA | A CAR STALLED IN HIGH WATER ON HUDSON ST. NEAR THE INTERSECTION OF REGENT ST. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched 5 storm reports to this flash flood warning; the first came 20 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 4.9 hours before the alert went out and 15 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.
- Mixed-layer CAPE
- 129 J/kg
- Mixed-layer CIN
- -187 J/kg
- Mixed-layer LCL
- 458 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS54 KSHV 111655
FFWSHV
LAC015-017-112000-
/O.NEW.KSHV.FF.W.0030.090511T1655Z-090511T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1155 AM CDT MON MAY 11 2009
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BOSSIER PARISH IN NORTHWEST LOUISIANA...
THIS INCLUDES THE CITIES OF...RED CHUTE...BOSSIER CITY...
CADDO PARISH IN NORTHWEST LOUISIANA...
THIS INCLUDES THE CITIES OF...VIVIAN...SHREVEPORT...
* UNTIL 300 PM CDT
* AT 1152 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A CLUSTER OF THUNDERSTORMS CONTAINING VERY HEAVY RAIN INCREASING
ACROSS SHREVEPORT AND BOSSIER CITY. APPROXIMATELY ONE INCH OF RAIN
HAS FALLEN WITHIN A HALF HOUR...WITH ANOTHER TWO TO THREE INCHES
POSSIBLE WITHIN THE NEXT TWO HOURS.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PLAIN
DEALING...OIL CITY...HAUGHTON...EASTWOOD...BLANCHARD AND BENTON
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
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.
&&
LAT...LON 3303 9404 3302 9351 3298 9353 3287 9345
3277 9346 3276 9344 3242 9344 3241 9341
3239 9343 3237 9340 3224 9342 3224 9361
3230 9363 3235 9377 3221 9392 3220 9404
$$
VII2 follow-up statements
000
WGUS74 KSHV 111817
FFSSHV
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
117 PM CDT MON MAY 11 2009
LAC015-017-112000-
/O.CON.KSHV.FF.W.0030.000000T0000Z-090511T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CADDO LA-BOSSIER LA-
117 PM CDT MON MAY 11 2009
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 PM CDT FOR
BOSSIER AND CADDO PARISHES...
AT 103 PM CDT...THE PUBLIC REPORTED SEVERAL INCHES OF WATER ON
AREA ROADS ACROSS WESTERN SHREVEPORT...AND NORTHEASTERN BOSSIER CITY.
URBAN FLOODING HAS LIKELY OCCURRED ACROSS OTHER AREAS IN THE METRO AREA
AS WELL. ALTHOUGH EXTREMELY RAINFALL WILL BEGIN TO DIMINISH ACROSS THE
METRO AREA...STANDING WATER WILL NOT SUBSIDE FOR AT LEAST ANOTHER HOUR.
ADDITIONAL THUNDERSTORM DEVELOPMENT LATER IN THE AFTERNOON COULD RESULT
IN RENEWED FLOODING.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VIVIAN...RED
CHUTE...PLAIN DEALING...OIL CITY...EASTWOOD...BLANCHARD AND BENTON
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
&&
LAT...LON 3303 9404 3302 9351 3298 9353 3287 9345
3277 9346 3276 9344 3242 9344 3241 9341
3239 9343 3237 9340 3224 9342 3224 9361
3230 9363 3235 9377 3221 9392 3220 9404
$$
VII000
WGUS74 KSHV 111915
FFSSHV
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
215 PM CDT MON MAY 11 2009
LAC015-017-111924-
/O.CAN.KSHV.FF.W.0030.000000T0000Z-090511T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CADDO LA-BOSSIER LA-
215 PM CDT MON MAY 11 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR BOSSIER AND CADDO
PARISHES...
THUNDERSTORMS WITH HEAVY RAIN HAVE MOVED EAST OF THE AREA. WATER SHOULD
BEGIN TO RECEDE ON ROADWAYS AND OTHER FLOODED AREAS.
LAT...LON 3303 9404 3302 9351 3298 9353 3287 9345
3277 9346 3276 9344 3242 9344 3241 9341
3239 9343 3237 9340 3224 9342 3224 9361
3230 9363 3235 9377 3221 9392 3220 9404
$$
VIIWhat 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 May 11, 10:56 AM CDT, 59 minutes earlier.
Area forecast discussion, May 11, 10:56 AM CDT, 59 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1056 AM CDT MON MAY 11 2009
.DISCUSSION...
FRONT JUST S OF A TYLER...TO SHREVEPORT...TO MONROE LINE THIS AM.
CONVECTION CONTINUES ALONG 850 FRONT ACROSS THE RED RIVER BASIN.
LOOKS LIKE GFS WAS DEAD ON WITH FORECASTING THIS CONVECTION
YESTERDAY...SO WILL CONTINUE USING IT FOR THE UPDATE. TWEAKED MAX
TEMPS FOR TODAY BASED ON CURRENT/FORECASTED FRONTAL POSITION. IT
SHOULD BE NOTED THAT ANY DEVIATION FROM THE FORECAST POSITION WILL
HAVE MAJOR IMPLICATIONS ON THE OBSERVED MAX T FOR THE DAY.
OTHERWISE...RAISED POPS IN THE N AND W AND LOWERED JUST A BIT IN
THE S AND E FOR THIS AFTERNOON. STILL THINK CONVECTION TO THE N IS
THE MAIN SHOW...WITH SCT CONVECTION ALONG AND S OF THE FRONT WITH
DAYTIME HEATING WARRANTING ONLY 50 POPS. AS MENTIONED IN EARLIER
UPDATE...FF WATCH HAS BEEN EXTENDED TO THE S FOR E TX AND N LA. AN
ADDITIONAL 3 TO 5 INCHES WITH ISOLATED TOTALS OF 6 TO 7 INCHES
WILL BE POSSIBLE OVER THE WATCH AREA TODAY. AREAS IN THE SRN MOST
PARTS OF THE WATCH MAY BE SPARED...BUT WERE INCLUDED JUST IN CASE.
UPDATE OUT SHORTLY. /12/
&&
.AVIATION...
THE MAIN FRONTAL BOUNDARY CONTINUES TO LINGER JUST SOUTH OF I20 THIS
MORNING...BUT IT/S EXPECTED TO LIFT SOME DURING THE DAY. OTHER
MINI OUTFLOW BOUNDARIES EXIST FROM THE ONGOING RAINFALL. TSRA AND
VCTS WILL REMAIN A FEATURE IN THE 18Z TAFS...AS CONVECTIVE ACTIVITY
WILL CONTINUE INTO THE AFTERNOON. IFR SKY CONDITIONS ARE BEING
OBSERVED ACROSS THE AREA...BUT SOME CHANGES ARE ON THE WAY. LFK WILL
BE GOING MVFR/VFR LATER THIS MORNING...WITH THE I20 TERMINALS
LIFTING LATER THIS AFTERNOON. TXK AND ELD WILL LIKELY STAY IFR
THROUGH THE DAY...AS THE MAIN FRONTAL BOUNDARY WILL STAY SOUTH OF
THESE TERMINALS. /11/
&&
.PRELIMINARY POINT TEMPS/POPS...
SHV 74 62 85 70 88 / 60 20 30 10 10
MLU 75 60 84 68 88 / 70 30 30 10 10
DEQ 65 54 78 63 86 / 100 40 40 10 20
TXK 65 57 81 70 86 / 100 30 40 10 20
ELD 70 57 80 68 88 / 90 30 40 10 20
TYR 75 63 85 71 86 / 60 10 20 10 10
GGG 74 62 86 70 87 / 60 20 20 10 10
LFK 89 66 89 70 88 / 50 10 20 10 10
&&
.SHV WATCHES/WARNINGS/ADVISORIES...
AR...FLASH FLOOD WATCH UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
ZONES: ARZ050-051-059>061-070>073.
LA...FLASH FLOOD WATCH UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
ZONES: LAZ001>006-014.
OK...FLASH FLOOD WATCH UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
ZONES: OKZ077.
TX...FLASH FLOOD WATCH UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
ZONES: TXZ096-097-108>112-124>126.
&&
12/11Hazardous weather outlook, May 11, 11:42 AM CDT, 13 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1142 AM CDT MON MAY 11 2009 ARZ050-051-059>061-070>073-LAZ001>006-014-OKZ077-TXZ096-097- 108>112-124>126-121200- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN- UNION LA-OUACHITA-MCCURTAIN-RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP- MORRIS-CASS-WOOD-UPSHUR-MARION- 1142 AM CDT MON MAY 11 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA... NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... ANOTHER UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THE REGION TODAY BRINGING HEAVY RAINFALL. FLASH FLOODING WILL BE THE MOST SIGNIFICANT THREAT WITH AN ADDITIONAL THREE TO FIVE INCHES OF RAINFALL POSSIBLE IN ALREADY RAIN SOAKED AREAS...ESPECIALLY ALONG AND NORTH OF THE SULPHUR RIVER OF EAST TEXAS...AND ACROSS ALL OF SOUTHWEST ARKANSAS. ISOLATED HIGHER AMOUNTS WILL ALSO BE POSSIBLE. THIS ADDITIONAL RAINFALL WILL ONLY AGGRAVATE ONGOING FLOODING CONDITIONS...AND MAY CAUSE PROBLEMS IN AREAS THAT HAVE NOT EXPERIENCED FLASH FLOODING THUS FAR. AN ISOLATED STRONG TO SEVERE THUNDERSTORM MAY ALSO BE POSSIBLE WITH THIS SYSTEM. HOWEVER...WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. LAZ010>013-017>022-TXZ136>138-149>153-165>167-121200- DE SOTO-RED RIVER-BIENVILLE-JACKSON-SABINE LA-NATCHITOCHES-WINN- GRANT-CALDWELL-LA SALLE-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA- NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-SABINE TX- 1142 AM CDT MON MAY 11 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL LOUISIANA...NORTHWEST LOUISIANA...EAST TEXAS AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY AS AN UPPER LEVEL DISTURBANCE MOVES ACROSS THE REGION. ISOLATED STRONG TO SEVERE THUNDERSTORMS MAY BE POSSIBLE THIS AFTERNOON. HOWEVER...WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. 12
In the hours before
Local storm report, May 11, 9:05 AM CDT, 2 hours 50 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
905 AM CDT MON MAY 11 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0825 AM FLASH FLOOD 3 W TEXARKANA 33.45N 94.07W
05/11/2009 BOWIE TX EMERGENCY MNGR
SEVERAL CREEKS AND RURAL ROADS FLOODED NEAR THE TEXARKANA
AREA INCLUDING AIKEN CREEK...ANDERSON CREEK...AND BARKMAN
CREEK.
&&
03Local storm report, May 11, 11:06 AM CDT, 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1106 AM CDT MON MAY 11 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1035 AM FLASH FLOOD EL DORADO 33.22N 92.66W
05/11/2009 UNION AR LAW ENFORCEMENT
STREET FLOODING IN SEVERAL AREAS AROUND ELDORADO.
1045 AM FLASH FLOOD 4 SW EL DORADO 33.18N 92.71W
05/11/2009 UNION AR LAW ENFORCEMENT
WATER OVER THE ROADS IN PARKERS CHAPEL.
1050 AM FLASH FLOOD 7 W EL DORADO 33.22N 92.78W
05/11/2009 UNION AR LAW ENFORCEMENT
FOUR INCHES OF WATER OVER US 82.
&&
CSThe office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 8:59 PM CDT | River Flood Warning | SHV | Lincoln, Ouachita, Union | 4 days |
| May 11, 10:00 AM CDT | River Flood Warning | SHV | Caldwell, Ouachita, Union | 35 days |
| May 11, 1:58 PM CDT | Severe Thunderstorm Warning | SHV | Grant, Natchitoches, Winn | 47 min |
| May 11, 2:47 PM CDT | Severe Thunderstorm Warning | SHV | Grant, LaSalle, Winn | 43 min |
Nearby
Flash Flood Warnings in Louisiana, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.