Alert archive / Louisiana / Flash Flood Warnings in 2013

Flash Flood Warning 31, NWS New Orleans, LA

July 11, 20134 parishes in Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 11, 2013, 2:59 PM CDT for 4 parishes in 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 counties it named.

The facts

Issued
Jul 11, 2013, 2:59 PM CDT (19:59 UTC)
Expired
Jul 11, 2013, 6:00 PM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.0 hours before the alert went out and 55 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, Slidell Radar S, LA at 12:00Z on 2013-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1294 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, Slidell Radar S, LA at 12:00Z on 2013-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939Sfc1 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
1294 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
804 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 5:29 AM CDTSpecial Marine WarningLIX46 min
Jul 11, 8:55 AM CDTSpecial Marine WarningLIX95 min
Jul 11, 12:35 PM CDTSpecial Marine WarningLIX55 min
Jul 11, 1:02 PM CDTSpecial Marine WarningLIX58 min
Jul 11, 1:44 PM CDTFlash Flood WarningLIXSaint Tammany3 hr
Jul 11, 1:51 PM CDTSpecial Marine WarningLIX24 min
Jul 11, 2:12 PM CDTSpecial Marine WarningLIX63 min
Jul 11, 2:49 PM CDTSpecial Marine WarningLIX56 min
Jul 11, 4:14 PM CDTSpecial Marine WarningLIX91 min

Nearby

Flash Flood Warnings in Louisiana, 2013Every flash flood warning in 2013

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.