Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 33, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood warning at Sep 17, 2021, 10:03 AM CDT for Bossier Parish, Caddo Parish, Louisiana. It was in force for 110 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 17, 2021, 10:03 AM CDT (15:03 UTC)
- Expired
- Sep 17, 2021, 11:53 AM CDT
- In force
- 110 min
- 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), 39 km from the middle of the area, began a volume at 15:06 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, 3.1 hours before the alert went out and 37 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
- 975 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 544 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
015
WGUS54 KSHV 171503
FFWSHV
LAC015-017-171815-
/O.NEW.KSHV.FF.W.0033.210917T1503Z-210917T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
1003 AM CDT Fri Sep 17 2021
The National Weather Service in Shreveport has issued a
* Flash Flood Warning for...
Northwestern Bossier Parish in northwestern Louisiana...
Northwestern Caddo Parish in northwestern Louisiana...
* Until 115 PM CDT.
* At 1003 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Additional rainfall amounts of 2 to 3 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Shreveport, Bossier City, Vivian, Blanchard, Benton, Oil City,
Mooringsport, Hosston, Belcher, Gilliam, Cavett, Dixie and Caddo
Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3296 9397 3296 9373 3254 9372 3256 9399
FLASH FLOOD...RADAR INDICATED
$$
132 follow-up statements
398
WGUS74 KSHV 171632
FFSSHV
Flash Flood Statement
National Weather Service Shreveport LA
1132 AM CDT Fri Sep 17 2021
LAC015-017-171815-
/O.CON.KSHV.FF.W.0033.000000T0000Z-210917T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bossier LA-Caddo LA-
1132 AM CDT Fri Sep 17 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT THIS
AFTERNOON FOR NORTHWESTERN BOSSIER AND NORTHWESTERN CADDO PARISHES...
At 1132 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 6 inches of rain
have fallen. Additional rainfall amounts up to 1 inch are possible
in the warned area.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Benton, Mooringsport, Hosston, Belcher, Gilliam, Cavett and Dixie.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3293 9393 3296 9373 3263 9372 3263 9397
FLASH FLOOD...RADAR INDICATED
$$
13990 WGUS74 KSHV 171653 FFSSHV Flash Flood Statement National Weather Service Shreveport LA 1153 AM CDT Fri Sep 17 2021 LAC015-017-171703- /O.CAN.KSHV.FF.W.0033.000000T0000Z-210917T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Bossier LA-Caddo LA- 1153 AM CDT Fri Sep 17 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BOSSIER AND NORTHWESTERN CADDO PARISHES... Flood waters have receded. The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3293 9393 3296 9373 3263 9372 3263 9397 $$ 13
Nearby
Flash Flood Warnings in Louisiana, 2021Every flash flood warning in 2021
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.