Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 3, NWS Shreveport, LA

February 4, 2012Grant Parish, LaSalle Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Feb 4, 2012, 9:27 AM CST for Grant Parish, LaSalle Parish, Louisiana. It was in force for 3 hr. 2 reports 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: Feb 4, 2012, 9:27 AM CST (15:27 UTC)
Expired: Feb 4, 2012, 12:30 PM CST
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Grant Parish, LA, LaSalle Parish, LA

What was reported inside it

Time	Report	Where	Remark
Feb 4, 9:30 AM CST	FLASH FLOOD	10 Ese Colfax, LA	ROCKHILL RD REMAINS BARRICADED AND HAS BEEN PARTIALLY WASHED OUT.
Feb 4, 9:30 AM CST	FLASH FLOOD	5 Ese Colfax, LA	ROCKHILL RD REMAINS BARRICADED AND HAS BEEN PARTIALLY WASHED OUT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 3.5 hours before the alert went out and 177 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: 1040 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -84 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.

574 
WGUS54 KSHV 041527
FFWSHV
LAC043-059-041830-
/O.NEW.KSHV.FF.W.0003.120204T1527Z-120204T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
927 AM CST SAT FEB 4 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN GRANT PARISH IN NORTH CENTRAL LOUISIANA...
  LA SALLE PARISH IN NORTH CENTRAL LOUISIANA...

* UNTIL 1230 PM CST

* AT 925 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OLLA...
  MIDWAY...JENA AND COLFAX...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF AN INCH ARE POSSIBLE IN THE WARNED 
AREA.

EXCESSIVE RUNOFF FROM THIS MONRINGS HEAVY RAINFALL WILL CAUSE 
FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. 
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF 
CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 3133 9200 3134 9203 3132 9208 3135 9209
      3141 9216 3146 9217 3147 9220 3142 9247
      3151 9272 3179 9244 3180 9236 3186 9232
      3193 9231 3192 9200

$$

24

1 follow-up statement

216 
WGUS74 KSHV 041749
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1149 AM CST SAT FEB 4 2012

LAC043-059-041830-
/O.CON.KSHV.FF.W.0003.000000T0000Z-120204T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA SALLE LA-GRANT LA-
1149 AM CST SAT FEB 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 PM CST FOR
GRANT AND LA SALLE PARISHES...

AT 1141 AM CST...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED SOME 
ISSUES WITH ONGOING RUNOFF OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OLLA...MIDWAY
AND JENA. THE BACK EDGE OF THE RAINFALL IS GOING TO MOVE OVER THE 
WARNING AREA DURING THE NEXT HALF HOUR. RUNOFF WILL SOON TAPER AND 
CONDITIONS WILL SLOWLY IMPROVE BY EARLY THIS AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 3133 9200 3134 9203 3132 9208 3135 9209
      3141 9216 3146 9217 3147 9220 3142 9247
      3151 9272 3179 9244 3180 9236 3186 9232
      3193 9231 3192 9200

$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 3, 9:30 PM CST	Flash Flood Watch	SHV	Bienville, Caldwell, Grant, Jackson, LaSalle, Lincoln and 6 more	15 hr
Feb 4, 8:18 AM CST	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, LaSalle, Ouachita, Winn	57 min
Feb 4, 9:00 AM CST	Flash Flood Warning	SHV	Ouachita	3 hr
Feb 4, 10:02 AM CST	River Flood Warning	SHV	Caldwell, Grant, LaSalle, Winn	48 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.