Alert archive / Louisiana / Flash Flood Warnings in 2015

Flash Flood Warning 49, NWS Shreveport, LA

May 25, 2015Bossier Parish, Caddo Parish, De Soto Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at May 25, 2015, 8:14 PM CDT for Bossier Parish, Caddo Parish, De Soto Parish, Louisiana. It was in force for 4 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
May 25, 2015, 8:14 PM CDT (01:14 UTC)
Expired
May 26, 2015, 12:15 AM CDT
In force
4 hr
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Flood severity
None

Counties Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA

The radar

The Shreveport radar (KSHV), 31 km from the middle of the area, began a volume at 01:13 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 (KBAD), launched 00:00Z, 1.2 hours before the alert went out and 28 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-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2015-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2131 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2015-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2131 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1156 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
1.6
Supercell composite
16.9

Open this sounding in Storm Lab

The text

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

644 
WGUS54 KSHV 260114
FFWSHV
LAC015-017-031-260515-
/O.NEW.KSHV.FF.W.0049.150526T0114Z-150526T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
814 PM CDT MON MAY 25 2015

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BOSSIER PARISH IN NORTHWESTERN LOUISIANA...
  CADDO PARISH IN NORTHWESTERN LOUISIANA...
  DE SOTO PARISH IN NORTHWESTERN LOUISIANA...

* UNTIL 1215 AM CDT
    
* AT 812 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE 
  THUNDERSTORMS FROM NEAR PLAIN DEALING TO NEAR SHREVEPORT ONTO NEAR 
  LOGANSPORT LOUISIANA. EXCESSIVE HEAVY RAINFALL IS OCCURRING WITH 
  THIS LINE. EXPECT RAINFALL AMOUNTS OF ONE TO THREE INCHES THIS 
  EVENING WHICH WILL PRODUCE FLASH FLOODING. 
    
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SHREVEPORT...BOSSIER CITY...MANSFIELD...VIVIAN...HAUGHTON...
  GREENWOOD...BLANCHARD...BENTON...STONEWALL...LOGANSPORT...PLAIN
  DEALING...OIL CITY...MOORINGSPORT...HOSSTON...RODESSA...BELCHER...
  IDA...GILLIAM...FOSTERS AND EASTWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3190 9390 3199 9404 3302 9404 3301 9351
      3297 9353 3287 9345 3241 9344 3241 9337
      3239 9343 3237 9340 3224 9342 3224 9361
      3218 9353 3213 9351 3211 9354 3203 9348
      3194 9335 3193 9343 3184 9344 3185 9388

$$

13
1 follow-up statement
132 
WGUS74 KSHV 260344
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1044 PM CDT MON MAY 25 2015

LAC015-017-031-260515-
/O.CON.KSHV.FF.W.0049.000000T0000Z-150526T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOSSIER LA-CADDO LA-DE SOTO LA-
1044 PM CDT MON MAY 25 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT FOR
BOSSIER...CADDO AND DE SOTO PARISHES...

AT 1041 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE WIDESPREAD 
LIGHT TO MODERATE RAIN ASSOCIATED WITH THUNDERSTORMS ACTIVITY ACROSS 
THE WARNED AREA. WHILE ADDITIONAL RAINFALL AMOUNTS SHOULD NOT BE 
EXCESSIVE FOR THE NEXT HOUR OR SO...RUNOFF FROM PREVIOUS RAINFALL IS 
NOT COMPLETE AND SOME ROAD SURFACES COULD STILL BE EXPERIENCING SOME 
FLOODING PROBLEMS. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
SHREVEPORT...BOSSIER CITY...MANSFIELD...VIVIAN...HAUGHTON...
GREENWOOD...BLANCHARD...BENTON...STONEWALL...LOGANSPORT...PLAIN
DEALING...OIL CITY...MOORINGSPORT...HOSSTON...RODESSA...BELCHER...
IDA...GILLIAM...FOSTERS AND EASTWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING.

&&

LAT...LON 3190 9390 3199 9404 3302 9404 3301 9351
      3297 9353 3287 9345 3241 9344 3241 9337
      3239 9343 3237 9340 3224 9342 3224 9361
      3218 9353 3213 9351 3211 9354 3203 9348
      3194 9335 3193 9343 3184 9344 3185 9388

$$

13

The office that day

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

IssuedProductOfficeCountiesLasted
May 25, 7:04 PM CDTSevere Thunderstorm WarningSHVBienville, Natchitoches, Winn56 min
May 25, 7:07 PM CDTTornado WarningSHVBienville, Jackson, Natchitoches, Winn38 min
May 25, 7:27 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo, De Soto, Sabine63 min
May 25, 7:36 PM CDTTornado WarningSHVCaddo, De Soto39 min
May 25, 8:08 PM CDTSpecial Weather StatementSHVLincoln52 min
May 25, 8:10 PM CDTTornado WarningSHVBossier, Caddo, De Soto44 min
May 25, 8:26 PM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 2 more64 min
May 25, 8:33 PM CDTTornado WarningSHVBienville, Bossier, Caddo, Webster42 min
May 25, 9:05 PM CDTTornado WarningSHVNatchitoches, Red River, Winn40 min
May 25, 9:22 PM CDTSevere Thunderstorm WarningSHVBienville, Caldwell, Claiborne, Jackson, Lincoln, Natchitoches and 4 more53 min
May 25, 10:05 PM CDTSevere Thunderstorm WarningSHVCaldwell, Jackson, Lincoln, Ouachita, Union, Winn40 min
May 25, 10:44 PM CDTSevere Thunderstorm WarningSHVCaldwell, Jackson, LaSalle, Ouachita, Union, Winn31 min
May 26, 6:13 PM CDTSevere Thunderstorm WarningSHVNatchitoches, Sabine47 min

Nearby

Flash Flood Warnings in Louisiana, 2015Every flash flood warning in 2015

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.