Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 101, NWS Jackson, MS

August 9, 20124 parishes in Louisiana

NWS Jackson, MS issued this flash flood warning at Aug 9, 2012, 10:21 PM CDT for 4 parishes in Louisiana. It was in force for 114 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: Aug 9, 2012, 10:21 PM CDT (03:21 UTC)
Expired: Aug 10, 2012, 12:15 AM CDT
In force: 114 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties East Carroll Parish, LA, Morehouse Parish, LA, Richland Parish, LA, West Carroll Parish, LA

The radar

The Jackson/Brandon,MS radar (KDGX), 160 km from the middle of the area, began a volume at 03:20 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

Jackson, MS (KJAN), launched 00:00Z, 3.4 hours before the alert went out and 150 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: 1206 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 953 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 10.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

950 
WGUS54 KJAN 100321
FFWJAN
LAC035-067-083-123-100515-
/O.NEW.KJAN.FF.W.0101.120810T0321Z-120810T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
1021 PM CDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN EAST CARROLL PARISH IN NORTHEAST LOUISIANA...
  EASTERN MOREHOUSE PARISH IN NORTHEAST LOUISIANA...
  NORTHEASTERN RICHLAND PARISH IN NORTHEAST LOUISIANA...
  WEST CARROLL PARISH IN NORTHEAST LOUISIANA...

* UNTIL 1215 AM CDT

* AT 1021 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED   
THUNDERSTORMS PRODUCING VERY HEAVY RAIN MOVING SOUTH ACROSS THE 
WARNING AREA. ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF TWO 
TO FOUR INCHES...HAVE OCCURRED IN THE PAST THREE HOURS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  GOODWILL...JONES...BEEKMAN AND OAK GROVE

THE ADDITIONAL STORMS WILL MOVE OVER THE WARNED AREA FOR THE NEXT 
TWO HOURS WITH AN ADDITIONAL ONE TO THREE INCHES POSSIBLE.

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 3298 9188 3298 9136 3271 9129 3254 9139
      3254 9147 3253 9147 3252 9191 3254 9192

$$

EEC

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 7:09 PM CDT	Special Weather Statement	JAN	Morehouse, West Carroll	31 min
Aug 9, 7:21 PM CDT	Special Weather Statement	JAN	Madison	29 min
Aug 9, 7:24 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, West Carroll	66 min
Aug 9, 7:32 PM CDT	Special Weather Statement	JAN	Morehouse	33 min
Aug 9, 7:41 PM CDT	Severe Thunderstorm Warning	JAN	Madison, Tensas	64 min
Aug 9, 7:52 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, Richland	53 min
Aug 9, 8:10 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll	23 min
Aug 9, 8:31 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, Richland	44 min
Aug 9, 8:42 PM CDT	Severe Thunderstorm Warning	JAN	Franklin, Madison, Tensas	63 min
Aug 9, 8:45 PM CDT	Severe Thunderstorm Warning	JAN	Franklin, Richland	60 min
Aug 9, 9:11 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Franklin, Richland, Tensas	64 min
Aug 9, 9:44 PM CDT	Severe Thunderstorm Warning	JAN	Franklin, Richland	46 min
Aug 9, 9:52 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Concordia, Tensas	53 min
Aug 9, 9:55 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, West Carroll	65 min
Aug 9, 10:00 PM CDT	Flash Flood Warning	JAN	Catahoula, Franklin, Richland	3 hr
Aug 9, 10:11 PM CDT	Severe Thunderstorm Warning	JAN	Franklin, Richland	49 min
Aug 9, 10:41 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, Richland, West Carroll	49 min
Aug 9, 10:43 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	62 min
Aug 9, 11:15 PM CDT	Special Weather Statement	JAN	West Carroll	30 min
Aug 9, 11:27 PM CDT	Special Weather Statement	JAN	West Carroll	28 min
Aug 10, 4:34 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Franklin	56 min
Aug 10, 4:49 PM CDT	Severe Thunderstorm Warning	JAN	Madison	56 min
Aug 10, 5:16 PM CDT	Special Weather Statement	JAN	Tensas	29 min
Aug 10, 5:42 PM CDT	Severe Thunderstorm Warning	JAN	Tensas	63 min
Aug 10, 6:00 PM CDT	Severe Thunderstorm Warning	JAN	Madison, Tensas	45 min
Aug 10, 6:04 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	56 min
Aug 10, 6:22 PM CDT	Flash Flood Warning	JAN	Concordia	79 min
Aug 10, 6:59 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	61 min

Nearby

Flash Flood Warnings in Louisiana, 2012 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.