Alert archive / Louisiana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 99, NWS New Orleans, LA

June 7, 2019Assumption Parish, Lafourche Parish, Saint James Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jun 7, 2019, 9:33 AM CDT for Assumption Parish, Lafourche Parish, Saint James Parish, Louisiana. It was in force for 27 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
Jun 7, 2019, 9:33 AM CDT (14:33 UTC)
Expired
Jun 7, 2019, 10:00 AM CDT
In force
27 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Assumption Parish, LA, Lafourche Parish, LA, Saint James Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.6 hours before the alert went out and 113 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 2019-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2462 joules per kilogram.LCLEL10008507005003002001001 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 2019-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 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
2462 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
616 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.9
Supercell composite
5.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 7, 4:18 AM CDT, 5 hours 15 minutes earlier.

Area forecast discussion, Jun 7, 4:18 AM CDT, 5 hours 15 minutes before
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Hazardous weather outlook, Jun 7, 5:52 AM CDT, 3 hours 41 minutes before
Hazardous Weather Outlook
National Weather Service New Orleans LA
552 AM CDT Fri Jun 7 2019

GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037-
039-040-046>050-056>072-MSZ068>071-077-080>082-072300-
Lake Pontchartrain and Lake Maurepas-Mississippi Sound-
Lake Borgne-Chandeleur Sound-Breton Sound-
Coastal Waters from Port Fourchon LA to Lower Atchafalaya River
LA out 20 nm-
Coastal waters from the Southwest Pass of the Mississippi River
to Port Fourchon Louisiana out 20 NM-
Coastal Waters from Boothville LA to Southwest Pass of the
Mississippi River out 20 nm-
Coastal waters from Pascagoula Mississippi to Stake Island out
20 NM-
Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya
River LA from 20 to 60 NM-
Coastal waters from Southwest Pass of the Mississippi River to
Port Fourchon Louisiana from 20 to 60 NM-
Coastal Waters from Stake Island LA to Southwest Pass of the
Mississippi River from 20 to 60 nm-
Coastal waters from Pascagoula Mississippi to Stake Island
Louisiana out 20 to 60 NM-Pointe Coupee-West Feliciana-
East Feliciana-St. Helena-Washington-St. Tammany-Iberville-
West Baton Rouge-East Baton Rouge-Ascension-Livingston-Assumption-
St. James-St. John The Baptist-Upper Lafourche-St. Charles-
Upper Jefferson-Orleans-Upper Plaquemines-Upper St. Bernard-
Upper Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-
Lower Plaquemines-Lower St. Bernard-Northern Tangipahoa-
Southern Tangipahoa-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-Jackson-
552 AM CDT Fri Jun 7 2019

This Hazardous Weather Outlook is for portions of Southeast
Louisiana...South Mississippi and the adjacent coastal waters.

.DAY ONE...Today and Tonight

There is a slight risk of excessive rainfall today. Although
widespread flooding is not expected, isolated flooding of low
lying and poor drainage areas will be possible.

There is a marginal risk of severe thunderstorms today. Damaging
winds, large hail, frequent lightning and isolated an tornado
will be possible.

Tide levels will remain elevated and may be up to some secondary
roadways, but conditions are not expected to cause any large scale
negative impacts.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The risk of widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Special weather statement, Jun 7, 9:26 AM CDT, 7 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 9:26 AM CDTSpecial Weather StatementLIXAssumption49 min
Jun 7, 9:44 AM CDTSpecial Weather StatementLIXTangipahoa61 min
Jun 7, 10:12 AM CDTSpecial Weather StatementLIXSaint Tammany63 min
Jun 7, 10:20 AM CDTSpecial Weather StatementLIXLafourche55 min
Jun 7, 10:27 AM CDTSpecial Marine WarningLIX2 hr
Jun 7, 11:50 AM CDTSpecial Marine WarningLIX115 min
Jun 7, 12:33 PM CDTSpecial Marine WarningLIX57 min
Jun 7, 2:14 PM CDTSpecial Weather StatementLIXTangipahoa, Washington61 min
Jun 7, 2:20 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington25 min
Jun 7, 3:05 PM CDTSpecial Marine WarningLIX115 min
Jun 7, 4:01 PM CDTSpecial Weather StatementLIXWest Feliciana59 min
Jun 7, 4:07 PM CDTSpecial Weather StatementLIXJefferson53 min
Jun 7, 5:11 PM CDTSpecial Weather StatementLIXEast Feliciana, Saint Helena64 min
Jun 7, 5:22 PM CDTSpecial Marine WarningLIX83 min
Jun 7, 6:23 PM CDTSpecial Marine WarningLIX97 min
Jun 7, 6:40 PM CDTSpecial Weather StatementLIXWashington65 min
Jun 7, 9:45 AM CDTSpecial Weather StatementLIXJackson45 min
Jun 7, 10:03 AM CDTSpecial Weather StatementLIXPearl River42 min
Jun 7, 11:25 AM CDTSpecial Weather StatementLIXHarrison65 min
Jun 7, 11:49 AM CDTSevere Thunderstorm WarningLIXHarrison, Jackson56 min
Jun 7, 12:12 PM CDTSevere Thunderstorm WarningLIXJackson48 min
Jun 7, 12:32 PM CDTSpecial Weather StatementLIXJackson58 min
Jun 7, 2:59 PM CDTSpecial Weather StatementLIXHarrison61 min
Jun 7, 3:22 PM CDTSevere Thunderstorm WarningLIXJackson43 min
Jun 7, 3:23 PM CDTSpecial Weather StatementLIXHarrison67 min
Jun 7, 3:29 PM CDTSevere Thunderstorm WarningLIXHarrison76 min
Jun 7, 3:59 PM CDTSpecial Weather StatementLIXAmite61 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2019Every severe thunderstorm 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.