Alert archive / Louisiana / Flash Flood Warnings in 2011

Flash Flood Warning 33, NWS Jackson, MS

March 9, 2011Catahoula Parish, Louisiana

NWS Jackson, MS issued this flash flood warning at Mar 9, 2011, 2:34 AM CST for Catahoula 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 9, 2011, 2:34 AM CST (08:34 UTC)
Expired: Mar 9, 2011, 4:30 AM CST
In force: 116 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Catahoula Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 9, 3:00 AM CST	FLASH FLOOD	Jonesville, LA	EXTENSIVE FLOODING AROUND THE CITY OF JONESVILLE...AND ALSO AROUND WALLACE RIDGE AND SANDY LAKE. APPROXIMATELY 40 HOMES WERE FLOODED WITH WATER UP TO A HALF FOOT DEEP. NUMEROUS ROADS WERE FLOODED ACROSS THE AREA.

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, 8.6 hours before the alert went out and 167 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 542 m²/s²
0-3 km storm-relative helicity: 664 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

872 
WGUS54 KJAN 090834
FFWJAN
LAC025-091030-
/O.NEW.KJAN.FF.W.0033.110309T0834Z-110309T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
234 AM CST WED MAR 9 2011

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CATAHOULA PARISH IN NORTHEAST LOUISIANA...

* UNTIL 430 AM CST

* AT 233 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED    
  THUNDERSTORMS PRODUCING HEAVY RAIN CONTINUING ACROSS THE WARNED    
  AREA. THE STORMS WERE MOVING NORTHEAST AROUND 30 MPH...BUT WERE    
  TENDING TO REDEVELOP ACROSS THE SAME LOCATIONS. ESTIMATED RADAR    
  RAINFALL AMOUNTS...ON THE ORDER OF FIVE TO SEVEN INCHES...HAVE     
  OCCURRED IN THE PAST SIX HOURS AND THERE HAVE BEEN REPORTS OF      
  MAJOR FLOODING...PARTICULAR AROUND JONESVILLE.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LEE
  BAYOU...AIMWELL...SHERWOOD...ENTERPRISE AND ROSEFIELD

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
TWO HOURS WITH AN ADDITIONAL ONE INCH 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 3194 9191 3198 9188 3188 9176 3191 9170
      3197 9164 3197 9159 3180 9156 3175 9153
      3175 9157 3177 9160 3174 9162 3174 9169
      3164 9170 3162 9175 3165 9177 3159 9182
      3152 9201 3193 9201

$$

BYB

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 8, 7:43 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	77 min
Mar 8, 9:58 PM CST	Severe Thunderstorm Warning	JAN	Catahoula	62 min
Mar 8, 10:47 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	43 min
Mar 8, 11:16 PM CST	Severe Thunderstorm Warning	JAN	Concordia, Franklin, Tensas	44 min
Mar 8, 11:30 PM CST	Flash Flood Warning	JAN	Catahoula	3 hr
Mar 8, 11:48 PM CST	Flash Flood Warning	JAN	Franklin, Madison, Tensas	3 hr
Mar 9, 12:07 AM CST	Severe Thunderstorm Warning	JAN	Concordia	23 min
Mar 9, 12:28 AM CST	Flash Flood Warning	JAN	Catahoula, Concordia	3 hr
Mar 9, 12:58 AM CST	Severe Thunderstorm Warning	JAN	Concordia	47 min
Mar 9, 2:47 AM CST	Flash Flood Warning	JAN	Tensas	118 min
Mar 9, 3:24 AM CST	Flash Flood Warning	JAN	Catahoula, Concordia	2 hr
Mar 9, 4:28 AM CST	Areal Flood Warning	JAN	Catahoula	6 hr

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.