Alert archive / Louisiana / Flash Flood Warnings in 2019

Flash Flood Warning 46, NWS Shreveport, LA

July 30, 2019Grant Parish, LaSalle Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Jul 30, 2019, 10:35 AM CDT for Grant Parish, LaSalle 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 counties it named.

The facts

Issued
Jul 30, 2019, 10:35 AM CDT (15:35 UTC)
Expired
Jul 30, 2019, 2:32 PM CDT
In force
4 hr
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Flood severity
None

Counties Grant Parish, LA, LaSalle Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.6 hours before the alert went out and 187 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, Lake Charles Mun, LA at 12:00Z on 2019-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2412 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2019-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 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
2412 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
761 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 3:55 PM CDTSpecial Weather StatementSHVAngelina50 min
Jul 30, 3:57 PM CDTSpecial Weather StatementSHVAngelina48 min
Jul 30, 4:49 PM CDTSpecial Weather StatementSHVPanola41 min
Jul 30, 5:05 PM CDTSpecial Weather StatementSHVCherokee55 min
Jul 30, 5:15 PM CDTSpecial Weather StatementSHVNacogdoches60 min
Jul 30, 6:02 PM CDTSpecial Weather StatementSHVCherokee58 min
Jul 29, 7:51 PM CDTSpecial Weather StatementSHVLaSalle54 min
Jul 30, 9:56 AM CDTAreal Flood AdvisorySHVGrant, LaSalle4 hr
Jul 30, 5:28 PM CDTSpecial Weather StatementSHVUnion62 min

Nearby

Flash Flood Warnings in Louisiana, 2019Every flash flood warning in 2019

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.