Alert archive / Louisiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 173, NWS New Orleans, LA

July 27, 2008Lafourche Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 27, 2008, 4:33 PM CDT for Lafourche Parish, Saint Charles Parish, Louisiana. It was in force for 42 min. 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 27, 2008, 4:33 PM CDT (21:33 UTC)
Expired
Jul 27, 2008, 5:15 PM CDT
In force
42 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon

Counties Lafourche Parish, LA, Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.6 hours before the alert went out and 89 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 2008-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3057 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 2008-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
3057 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
609 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
164 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 27, 12:09 AM CDTSpecial Marine WarningLIX96 min
Jul 27, 4:34 AM CDTHeat AdvisoryLIXEast Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Helena, West Baton Rouge and 1 more16 hr
Jul 27, 6:18 AM CDTSpecial Marine WarningLIX57 min
Jul 27, 7:21 AM CDTSpecial Marine WarningLIX54 min
Jul 27, 7:40 AM CDTSpecial Marine WarningLIX95 min
Jul 27, 8:36 AM CDTSpecial Marine WarningLIX84 min
Jul 27, 8:42 AM CDTSpecial Marine WarningLIX93 min
Jul 27, 11:22 AM CDTSpecial Marine WarningLIX83 min
Jul 27, 12:57 PM CDTRiver Flood WarningLIXSt. Mary7 hr
Jul 27, 2:41 PM CDTSpecial Marine WarningLIX41 min
Jul 27, 3:30 PM CDTSpecial Marine WarningLIX60 min
Jul 27, 3:39 PM CDTSpecial Marine WarningLIX66 min
Jul 27, 4:05 PM CDTSpecial Marine WarningLIX55 min
Jul 27, 4:14 PM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Saint Bernard46 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2008Every severe thunderstorm warning in 2008

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.