Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 2, NWS Shreveport, LA

April 9, 20216 parishes in Louisiana

NWS Shreveport, LA issued this flash flood warning at Apr 9, 2021, 7:35 PM CDT for 6 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 outline as issued.

The facts

Issued: Apr 9, 2021, 7:35 PM CDT (00:35 UTC)
Expired: Apr 9, 2021, 10:45 PM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

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

The radar

The Ft Polk radar (KPOE), 153 km from the middle of the area, began a volume at 00:34 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, 0.6 hours before the alert went out and 145 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: 148 J/kg
Mixed-layer CIN: -321 J/kg
Mixed-layer LCL: 2441 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

925 
WGUS54 KSHV 100035
FFWSHV
LAC021-049-061-073-111-127-100345-
/O.NEW.KSHV.FF.W.0002.210410T0035Z-210410T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
735 PM CDT Fri Apr 9 2021

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  Northwestern Caldwell Parish in north central Louisiana...
  Jackson Parish in north central Louisiana...
  Southeastern Lincoln Parish in north central Louisiana...
  Ouachita Parish in north central Louisiana...
  South Central Union Parish in north central Louisiana...
  Northeastern Winn Parish in north central Louisiana...

* Until 1045 PM CDT.

* At 735 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Monroe, Claiborne, West Monroe, Brownsville-Bawcomville, 
  Brownsville-Bawcom, Swartz, Richwood, Chatham, Eros, Lapine, Luna, 
  Caderville, Cheniere, Mineral Springs, Vixen, Folksville, Fondale, 
  Calhoun, Drew and Bosco.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3215 9256 3220 9266 3236 9268 3246 9261
      3251 9240 3263 9225 3265 9208 3268 9209
      3268 9203 3265 9198 3250 9192 3238 9200
      3228 9203 3228 9199 3226 9200 3225 9199
      3221 9200 3218 9203 3214 9213 3210 9236

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR 

$$

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:03 PM CDT	Special Weather Statement	SHV	Jackson	42 min
Apr 9, 7:11 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Red River, Sabine	64 min
Apr 9, 7:18 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Ouachita	42 min
Apr 9, 7:30 PM CDT	Special Weather Statement	SHV	Union	45 min
Apr 9, 7:35 PM CDT	Special Weather Statement	SHV	Webster	40 min
Apr 9, 7:35 PM CDT	Special Weather Statement	SHV	De Soto	40 min
Apr 9, 7:40 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Natchitoches, Red River, Winn	42 min
Apr 9, 7:50 PM CDT	Special Weather Statement	SHV	Claiborne, Lincoln	40 min
Apr 9, 7:55 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Winn	65 min
Apr 9, 7:57 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	22 min
Apr 9, 8:33 PM CDT	Special Weather Statement	SHV	Claiborne, Webster	42 min
Apr 9, 8:36 PM CDT	Special Weather Statement	SHV	De Soto	54 min
Apr 9, 8:43 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita, Winn	62 min
Apr 9, 8:50 PM CDT	Special Weather Statement	SHV	Natchitoches	55 min
Apr 9, 9:32 PM CDT	Special Weather Statement	SHV	Grant, LaSalle	58 min
Apr 9, 10:27 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	40 min
Apr 9, 10:40 PM CDT	Special Weather Statement	SHV	Ouachita, Winn	50 min
Apr 9, 11:42 PM CDT	Severe Thunderstorm Warning	SHV	Caddo	63 min
Apr 10, 12:23 AM CDT	Special Weather Statement	SHV	Bossier, Caddo, Webster	67 min
Apr 10, 12:32 AM CDT	Special Weather Statement	SHV	LaSalle	43 min
Apr 10, 12:41 AM CDT	Special Weather Statement	SHV	Claiborne, Lincoln, Union	49 min
Apr 10, 12:45 AM CDT	Severe Thunderstorm Warning	SHV	LaSalle	45 min
Apr 10, 12:46 AM CDT	Special Weather Statement	SHV	Sabine	29 min

Nearby

Flash Flood Warnings in Louisiana, 2021 Every 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.