Alert archive / Louisiana / Flash Flood Warnings in 2011

Flash Flood Warning 35, NWS Jackson, MS

March 9, 2011Tensas Parish, Louisiana

NWS Jackson, MS issued this flash flood warning at Mar 9, 2011, 2:47 AM CST for Tensas Parish, Louisiana. It was in force for 118 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: Mar 9, 2011, 2:47 AM CST (08:47 UTC)
Expired: Mar 9, 2011, 4:45 AM CST
In force: 118 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Tensas Parish, LA

The radar

The Jackson/Brandon,MS radar (KDGX), 135 km from the middle of the area, began a volume at 08:47 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, 8.8 hours before the alert went out and 128 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.

732 
WGUS54 KJAN 090847
FFWJAN
LAC107-091045-
/O.NEW.KJAN.FF.W.0035.110309T0847Z-110309T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN TENSAS PARISH IN NORTHEAST LOUISIANA...

* UNTIL 445 AM CST

* AT 246 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED    
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ACROSS THE WARNED AREA.    
  THE STORMS WERE MOVING EAST NORTHEAST AROUND 30 MPH...BUT WERE     
  TENDING TO REDEVELOP IN THE SAME LOCATIONS. ESTIMATED RADAR        
  RAINFALL AMOUNTS...ON THE ORDER OF TWO TO FOUR INCHES...HAVE       
  OCCURRED IN THE PAST THREE HOURS.

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 3192 9153 3204 9108 3199 9111 3199 9116
      3190 9121 3187 9126 3182 9125 3186 9129
      3184 9134 3176 9136 3178 9126 3176 9126
      3175 9127 3176 9153 3178 9155 3188 9157

$$

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, 2:34 AM CST	Flash Flood Warning	JAN	Catahoula	116 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.