Alert archive / Louisiana / Flash Flood Warnings in 2011

Flash Flood Warning 45, NWS Jackson, MS

March 29, 2011Franklin Parish, Madison Parish, Tensas Parish, Louisiana

NWS Jackson, MS issued this flash flood warning at Mar 29, 2011, 10:07 PM CDT for Franklin Parish, Madison Parish, Tensas Parish, Louisiana. It was in force for 113 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 29, 2011, 10:07 PM CDT (03:07 UTC)
Expired: Mar 30, 2011, 12:00 AM CDT
In force: 113 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Franklin Parish, LA, Madison Parish, LA, Tensas Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 29, 10:30 PM CDT	FLASH FLOOD	Winnsboro, LA	FLOODED RDS CONTINUED IN AND AROUND WINNSBORO.

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 00:00Z, 3.1 hours before the alert went out and 162 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: 780 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 504 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.8

Open this sounding in Storm Lab

The text

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

263 
WGUS54 KJAN 300307
FFWJAN
LAC041-065-107-300500-
/O.NEW.KJAN.FF.W.0045.110330T0307Z-110330T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
1007 PM CDT TUE MAR 29 2011

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FRANKLIN PARISH IN NORTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF WINNSBORO...
  SOUTHWESTERN MADISON PARISH IN NORTHEAST LOUISIANA...
  NORTHWESTERN TENSAS PARISH IN NORTHEAST LOUISIANA...

* UNTIL MIDNIGHT CDT

* AT 1006 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN NEAR WINNSBORO...MOVING
  NORTHEAST AT 10 MPH. ESTIMATED RADAR RAINFALL AMOUNTS...ON THE
  ORDER OF TWO TO FOUR INCHES...HAVE OCCURRED IN THE PAST THREE      
  HOURS. SOME ROADS AROUND THE AREA ARE CURRENTLY FLOODED.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CROWVILLE...NEWLIGHT AND BAKERS

VERY HEAVY RAINFALL WILL CONTINUE 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 3210 9191 3210 9189 3212 9187 3216 9190
      3221 9182 3223 9181 3226 9177 3229 9177
      3242 9145 3205 9134 3202 9190 3208 9192

$$

CME

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 7:00 PM CDT	Severe Thunderstorm Warning	JAN	Madison, Tensas	60 min
Mar 29, 7:18 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll, West Carroll	57 min
Mar 29, 7:33 PM CDT	Severe Thunderstorm Warning	JAN	Madison, Tensas	27 min
Mar 29, 10:23 PM CDT	Flash Flood Warning	JAN	Madison, Tensas	2 hr
Mar 29, 11:54 PM CDT	Special Weather Statement	JAN	Catahoula, Concordia	31 min
Mar 30, 12:39 AM CDT	Severe Thunderstorm Warning	JAN	Franklin, Madison, Tensas	56 min
Mar 30, 1:01 AM CDT	Severe Thunderstorm Warning	JAN	Concordia, Tensas	15 min
Mar 30, 1:31 AM CDT	Severe Thunderstorm Warning	JAN	Madison	22 min
Mar 30, 4:34 AM CDT	Severe Thunderstorm Warning	JAN	Tensas	29 min
Mar 30, 4:41 AM CDT	Severe Thunderstorm Warning	JAN	Madison, Tensas	23 min

Nearby

Flash Flood Warnings in Louisiana, 2011 Every flash flood warning in 2011

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.