Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 2, NWS Shreveport, LA

February 4, 2012Ouachita Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Feb 4, 2012, 9:00 AM CST for Ouachita Parish, Louisiana. It was in force for 3 hr. 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: Feb 4, 2012, 9:00 AM CST (15:00 UTC)
Expired: Feb 4, 2012, 12:00 PM CST
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

County Ouachita Parish, LA

The radar

The Shreveport radar (KSHV), 164 km from the middle of the area, began a volume at 15:03 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.

What was reported inside it

Time	Report	Where	Remark
Feb 4, 10:43 AM CST	FLASH FLOOD	Monroe, LA	A HOUSE AT 323 CEDARBROOK DRIVE IN MONROE WAS FLOODED DUE TO EXCESSIVE RAINFALL. OTHER STREETS THROUGHOUT MONROE WERE FLOODED AS WELL.

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, 3.0 hours before the alert went out and 155 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.

759 
WGUS54 KSHV 041500
FFWSHV
LAC073-041800-
/O.NEW.KSHV.FF.W.0002.120204T1500Z-120204T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

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

* UNTIL NOON CST

* AT 855 AM CST...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED LOCAL 
FLASH FLOODING FROM VERY HEAVY RAIN FROM A SLOW MOVING LINE 
THUNDERSTORMS OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE ALL OF OUACHITA PARISH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE INCH ARE POSSIBLE IN THE WARNED 
AREA OVER THE NEXT HOUR.

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 3240 9199 3228 9203 3228 9210 3226 9211
      3228 9231 3232 9231 3241 9242 3258 9241
      3259 9223 3272 9207 3269 9204 3271 9204
      3271 9198 3267 9194 3266 9191 3259 9192
      3251 9190

$$

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, 9:27 AM CST	Flash Flood Warning	SHV	Grant, LaSalle	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; radar from the NEXRAD Level II archive.