Alert archive / Louisiana / Flash Flood Warnings in 2012
Flash Flood Warning 20, NWS Jackson, MS
NWS Jackson, MS issued this flash flood warning at Mar 21, 2012, 9:49 AM CDT for Franklin Parish, Richland Parish, Louisiana. It was in force for 116 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, 9:49 AM CDT (14:49 UTC)
- Expired
- Mar 21, 2012, 11:45 AM CDT
- In force
- 116 min
- Issued by
- NWS Jackson, MS
- Area
- Storm-based polygon
- Flood severity
- None
Counties Franklin Parish, LA, Richland Parish, LA
The radar
The Jackson/Brandon,MS radar (KDGX), 169 km from the middle of the area, began a volume at 14:49 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, 11:30 AM CDT | FLASH FLOOD | Rayville, LA | NUMEROUS ROADS FLOODED AROUND RICHLAND PARISH |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 2.8 hours before the alert went out and 160 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
- 143 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 559 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 239 m²/s²
- 0-3 km storm-relative helicity
- 239 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
498
WGUS54 KJAN 211449
FFWJAN
LAC041-083-211645-
/O.NEW.KJAN.FF.W.0020.120321T1449Z-120321T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
949 AM CDT WED MAR 21 2012
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
* FLASH FLOOD WARNING FOR...
FRANKLIN PARISH IN NORTHEAST LOUISIANA...
THIS INCLUDES THE CITY OF WINNSBORO...
CENTRAL RICHLAND PARISH IN NORTHEAST LOUISIANA...
THIS INCLUDES THE CITIES OF...START...RAYVILLE...MANGHAM...
* UNTIL 1145 AM CDT
* AT 947 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
THUNDERSTORMS PRODUCING VERY HEAVY RAIN SCROSS THE WARNED AREA.
RADAR ESTIMATED THAT ONE AND A HALF TO THREE INCHES OF RAIN HAD
FALLEN OVER THE WARNED AREA THIS MORNING. ADDITIONAL RAINFALL OF
1 TO 3 INCHES OVER THE NEXT TWO HOURS WILL LIKELY CAUSE FLOODING
OF LOW LYING AND POOR DRAINAGE AREAS...AS WELL AS SMALL BAYOUS AND
CREEKS.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOLLY
RIDGE
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE WATER COVERS THE ROADWAY. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
&&
LAT...LON 3252 9185 3252 9184 3254 9184 3257 9181
3256 9175 3259 9173 3261 9162 3198 9156
3194 9183 3229 9191
$$The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 21, 7:27 AM CDT | Special Weather Statement | JAN | Catahoula | 28 min |
| Mar 21, 7:29 AM CDT | Tornado Warning | JAN | Catahoula, Concordia | 46 min |
| Mar 21, 8:42 AM CDT | Special Weather Statement | JAN | Catahoula | 28 min |
| Mar 21, 9:03 AM CDT | Tornado Warning | JAN | Catahoula, Franklin | 42 min |
| Mar 21, 9:38 AM CDT | Severe Thunderstorm Warning | JAN | Richland | 41 min |
| Mar 21, 9:51 AM CDT | Special Weather Statement | JAN | Tensas | 44 min |
| Mar 21, 10:20 AM CDT | Areal Flood Warning | JAN | Concordia | 3 hr |
| Mar 21, 10:48 AM CDT | Severe Thunderstorm Warning | JAN | Madison | 57 min |
| Mar 21, 12:47 PM CDT | Areal Flood Warning | JAN | East Carroll, Franklin, Madison, Morehouse, Richland, West Carroll | 12 hr |
Nearby
Flash Flood Warnings in Louisiana, 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.