Alert archive / Louisiana / Flash Flood Warnings in 2012
Flash Flood Warning 20, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood warning at Mar 21, 2012, 9:36 AM CDT for Union Parish, Louisiana; Union County, Arkansas. It was in force for 114 min. 1 report 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
- Mar 21, 2012, 9:36 AM CDT (14:36 UTC)
- Expired
- Mar 21, 2012, 11:30 AM CDT
- In force
- 114 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Union County, AR, Union Parish, LA
The radar
The Shreveport radar (KSHV), 147 km from the middle of the area, began a volume at 14:36 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 |
|---|---|---|---|
| Mar 21, 9:58 AM CDT | FLASH FLOOD | Farmerville, LA | SOME PARISH ROADS STILL FLOODED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 2.6 hours before the alert went out and 138 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 0 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- -164 m²/s²
- 0-3 km storm-relative helicity
- 465 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
043
WGUS54 KSHV 211436
FFWSHV
ARC139-LAC111-211630-
/O.NEW.KSHV.FF.W.0020.120321T1436Z-120321T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
936 AM CDT WED MAR 21 2012
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS EXTENDED THE
* FLASH FLOOD WARNING FOR...
UNION PARISH IN NORTH CENTRAL LOUISIANA...
EASTERN UNION COUNTY IN SOUTH CENTRAL ARKANSAS...
THIS INCLUDES THE CITIES OF...HUTTIG...EL DORADO...
* UNTIL 1130 AM CDT
* AT 927 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
MODERATE TO OCCASIONALLY HEAVY RAIN STILL OCCURRING OVER THE
WARNED AREA. RESIDUAL STREET FLOODING WILL CONTINUE OVER UNION
PARISH LOUISIANA AND EASTERN UNION COUNTY ARKANSAS...THROUGH
1130 AM CDT.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO URBANA...
STRONG...LAWSON...LAPILE AND CALION...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.
&&
LAT...LON 3259 9223 3258 9241 3267 9242 3267 9251
3272 9252 3275 9257 3277 9273 3301 9273
3301 9268 3337 9266 3337 9265 3337 9254
3328 9244 3330 9235 3325 9222 3321 9221
3315 9210 3310 9213 3301 9206 3274 9205
$$
031 follow-up statement
648
WGUS74 KSHV 211527
FFSSHV
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1027 AM CDT WED MAR 21 2012
ARC139-LAC111-211630-
/O.CON.KSHV.FF.W.0020.000000T0000Z-120321T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION AR-UNION LA-
1027 AM CDT WED MAR 21 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT FOR
UNION COUNTY...AND UNION PARISH...
AT 1023 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED RESIDUAL
STREET FLOODING OCCURRING IN RURAL PARTS OF THE UNION PARISH.
RESIDUAL FLOODING IS ALSO LIKELY STILL OCCURRING OVER EASTERN
UNION COUNTY ARKANSAS.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO URBANA...
STRONG...LAWSON...LAPILE...HUTTIG...EL DORADO AND CALION
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.
&&
LAT...LON 3259 9223 3258 9241 3267 9242 3267 9251
3272 9252 3275 9257 3277 9273 3301 9273
3301 9268 3337 9266 3337 9265 3337 9254
3328 9244 3330 9235 3325 9222 3321 9221
3315 9210 3310 9213 3301 9206 3274 9205
$$
03The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 8:55 PM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Sabine, Winn | 10 hr |
| Mar 20, 9:02 PM CDT | River Flood Warning | SHV | Bienville, Bossier, Red River, Webster | 11 days |
| Mar 20, 9:03 PM CDT | Tornado Warning | SHV | Natchitoches | 27 min |
| Mar 20, 9:15 PM CDT | Flash Flood Warning | SHV | Bienville, De Soto, Red River | 9 hr |
| Mar 20, 9:24 PM CDT | Tornado Warning | SHV | Natchitoches | 36 min |
| Mar 20, 10:20 PM CDT | Tornado Warning | SHV | Grant, Natchitoches | 40 min |
| Mar 20, 10:50 PM CDT | Flash Flood Warning | SHV | Bossier, Claiborne, Webster | 10 hr |
| Mar 21, 1:52 AM CDT | Flash Flood Warning | SHV | Bienville, Jackson, Lincoln, Union | 8 hr |
| Mar 21, 2:49 AM CDT | Tornado Warning | SHV | Grant, Winn | 26 min |
| Mar 21, 3:14 AM CDT | Tornado Warning | SHV | Jackson, Winn | 46 min |
| Mar 21, 5:41 AM CDT | Tornado Warning | SHV | Jackson, Winn | 34 min |
| Mar 21, 6:16 AM CDT | Flash Flood Warning | SHV | Bienville, Red River | 3 hr |
| Mar 21, 6:47 AM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Red River, Sabine, Winn | 4 hr |
| Mar 21, 8:44 AM CDT | Flash Flood Warning | SHV | Claiborne | 2 hr |
| Mar 21, 10:51 AM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Winn | 3 hr |
| Mar 21, 1:53 PM CDT | Areal Flood Warning | SHV | Natchitoches | 6 hr |
| Mar 20, 7:27 PM CDT | River Flood Warning | SHV | Ashley, Union | 28 days |
Nearby
Flash Flood Warnings in Louisiana, 2012Flash Flood Warnings in Arkansas, 2012Every flash flood warning in 2012
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.