Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 29, NWS Shreveport, LA

July 11, 2012Jackson Parish, Ouachita Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Jul 11, 2012, 4:49 PM CDT for Jackson Parish, Ouachita Parish, Louisiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 11, 2012, 4:49 PM CDT (21:49 UTC)
Expired: Jul 11, 2012, 7:45 PM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Jackson Parish, LA, Ouachita Parish, LA

The radar

The Shreveport radar (KSHV), 161 km from the middle of the area, began a volume at 21:50 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

Shreveport, LA (KSHV), launched 12:00Z, 9.8 hours before the alert went out and 153 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: 1004 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 479 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

831 
WGUS54 KSHV 112149
FFWSHV
LAC049-073-120045-
/O.NEW.KSHV.FF.W.0029.120711T2149Z-120712T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
449 PM CDT WED JUL 11 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN JACKSON PARISH IN NORTH CENTRAL LOUISIANA...
  OUACHITA PARISH IN NORTH CENTRAL LOUISIANA...
  THIS INCLUDES THE CITIES OF...WEST MONROE...SWARTZ...MONROE...
  CLAIBORNE...BROWNSVILLE-BAWCOMVILLE...

* UNTIL 745 PM CDT.

* AT 440 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  VERY HEAVY RAIN FROM A CLUSTER OF THUNDERSTORMS FROM NEAR          
  EROS...TO MINERAL SPRINGS...TO MONROE...TO SWARTZ. RADAR     
  ESTIMATES INDICATE THAT RAIN RATES WITH THESE THUNDERSTORMS ARE      
  EXCEEDING TWO INCHES PER HOUR...WITH AN ADDITIONAL ONE TO THREE    
  INCHES POSSIBLE OVER THE NEXT COUPLE OF HOURS. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MINERAL
  SPRINGS...MILLHAVEN...FOLKSVILLE...EUREKA...DREW...CHENIERE AND
  CALHOUN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SHREVEPORT.

&&

LAT...LON 3248 9193 3245 9193 3240 9199 3228 9202
      3228 9243 3249 9244 3250 9241 3258 9241
      3258 9225 3261 9222 3263 9192 3259 9192
      3251 9190

$$

12

1 follow-up statement

784 
WGUS74 KSHV 112324
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
624 PM CDT WED JUL 11 2012

LAC049-073-120045-
/O.CON.KSHV.FF.W.0029.000000T0000Z-120712T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OUACHITA LA-JACKSON LA-
624 PM CDT WED JUL 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
JACKSON AND OUACHITA PARISHES...

AT 618 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT RAINFALL ACROSS OUACHITA PARISH AND EXTREME WESTERN WINN 
PARISH. ALTHOUGH THE RAIN HAS LET UP SOME...ANY ONGOING FLOODING MAY 
CONTINUE FOR ANOTHER COUPLE OF HOURS OR SO...AS RUNOFF MAY BE SLOW 
DUE TO SATURATED SOILS OR IN URBAN AREAS WHERE DRAINAGE SYSTEMS MAY 
BE BACKED UP.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEST 
MONROE...SWARTZ...MONROE AND CLAIBORNE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SHREVEPORT.

&&

LAT...LON 3248 9193 3245 9193 3240 9199 3228 9202
      3228 9243 3249 9244 3250 9241 3258 9241
      3258 9225 3261 9222 3263 9192 3259 9192
      3251 9190

$$

12

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 10, 10:12 PM CDT	Areal Flood Advisory	SHV	Bossier, Caddo	63 min
Jul 11, 11:29 AM CDT	Areal Flood Advisory	SHV	Bienville, Claiborne, Webster	2 hr
Jul 11, 2:13 PM CDT	Flash Flood Warning	SHV	Bossier, Caddo, Claiborne, Union, Webster	4 hr
Jul 11, 3:24 PM CDT	Flash Flood Warning	SHV	Bienville, Jackson, Winn	3 hr
Jul 11, 4:35 PM CDT	Flash Flood Warning	SHV	Bienville, Natchitoches, Red River, Winn	3 hr
Jul 11, 6:31 PM CDT	Areal Flood Advisory	SHV	Bossier, Caddo, De Soto	119 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.