Alert archive / Mississippi / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 227, NWS New Orleans, LA

August 15, 2023Harrison County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Aug 15, 2023, 4:37 PM CDT for Harrison County, Mississippi. It was in force for 23 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
Aug 15, 2023, 4:37 PM CDT (21:37 UTC)
Expired
Aug 15, 2023, 5:00 PM CDT
In force
23 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Harrison County, MS

The radar

The Mobile radar (KMOB), 86 km from the middle of the area, began a volume at 21:38 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.6 hours before the alert went out and 62 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 2023-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1861 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 2023-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
1861 J/kg
Mixed-layer CIN
-114 J/kg
Mixed-layer LCL
1112 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 15, 3:46 PM CDT, 51 minutes earlier.

Area forecast discussion, Aug 15, 3:46 PM CDT, 51 minutes before
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In the hours before

Special weather statement, Aug 15, 3:18 PM CDT, 1 hour 19 minutes before
Special Weather Statement
National Weather Service New Orleans LA
318 PM CDT Tue Aug 15 2023

LAZ079-152045-
Northern St. Tammany LA-
318 PM CDT Tue Aug 15 2023

...A strong thunderstorm will impact portions of northwestern St.
Tammany Parish through 345 PM CDT...

At 318 PM CDT, Doppler radar was tracking a strong thunderstorm near
Folsom, or 8 miles north of Covington, moving southeast at 20 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Covington, Abita Springs, Folsom and Bush.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3067 9003 3061 8983 3038 8997 3042 9005
      3055 9025 3059 9025 3070 9018
TIME...MOT...LOC 2018Z 299DEG 16KT 3060 9015

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Zeringue
Special weather statement, Aug 15, 3:39 PM CDT, 58 minutes before
Special Weather Statement
National Weather Service New Orleans LA
339 PM CDT Tue Aug 15 2023

LAZ079>082-152115-
Central Tangipahoa LA-Lower Tangipahoa LA-Northern St. Tammany LA-
Southwestern St. Tammany LA-
339 PM CDT Tue Aug 15 2023

...A strong thunderstorm will impact portions of west central St.
Tammany and southeastern Tangipahoa Parishes through 415 PM CDT...

At 339 PM CDT, Doppler radar was tracking a strong thunderstorm near
Robert, or 8 miles southeast of Hammond. This storm was nearly
stationary.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Hammond, Ponchatoula, Madisonville and Robert.

This includes Interstate 12 between mile markers 41 and 57.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3057 9027 3039 9012 3028 9038 3028 9039
      3029 9040 3050 9045
TIME...MOT...LOC 2039Z 334DEG 4KT 3045 9033

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Zeringue
Special weather statement, Aug 15, 3:55 PM CDT, 42 minutes before
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Special weather statement, Aug 15, 4:09 PM CDT, 28 minutes before
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Special weather statement, Aug 15, 4:14 PM CDT, 23 minutes before
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Special weather statement, Aug 15, 4:20 PM CDT, 17 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 2:51 PM CDTSpecial Weather StatementLIXSaint Tammany24 min
Aug 15, 3:18 PM CDTSpecial Weather StatementLIXSaint Tammany27 min
Aug 15, 3:32 PM CDTSevere Thunderstorm WarningLIXSaint Tammany43 min
Aug 15, 3:39 PM CDTSpecial Weather StatementLIXTangipahoa36 min
Aug 15, 3:55 PM CDTSpecial Weather StatementLIXLivingston35 min
Aug 15, 3:57 PM CDTSevere Thunderstorm WarningLIXSaint Tammany48 min
Aug 15, 4:18 PM CDTSpecial Marine WarningLIX57 min
Aug 15, 5:08 PM CDTSpecial Weather StatementLIXSaint John the Baptist37 min
Aug 15, 5:11 PM CDTSpecial Marine WarningLIX64 min
Aug 15, 5:11 PM CDTSpecial Weather StatementLIXSaint Charles34 min
Aug 15, 5:13 PM CDTSpecial Marine WarningLIX32 min
Aug 15, 5:15 PM CDTSpecial Marine WarningLIX60 min
Aug 15, 5:23 PM CDTSpecial Weather StatementLIXSaint John the Baptist37 min
Aug 15, 5:36 PM CDTSpecial Weather StatementLIXSaint Charles24 min
Aug 15, 5:42 PM CDTSpecial Marine WarningLIX63 min
Aug 15, 5:44 PM CDTSevere Thunderstorm WarningLIXLivingston, Tangipahoa31 min
Aug 15, 6:20 PM CDTSpecial Marine WarningLIX55 min
Aug 15, 6:23 PM CDTSpecial Weather StatementLIXSaint Charles37 min
Aug 15, 6:27 PM CDTSpecial Weather StatementLIXLafourche33 min
Aug 15, 6:40 PM CDTAreal Flood AdvisoryLIXJefferson2 hr
Aug 15, 6:40 PM CDTSpecial Marine WarningLIX65 min
Aug 15, 3:11 PM CDTSpecial Weather StatementLIXPearl River34 min
Aug 15, 3:36 PM CDTSevere Thunderstorm WarningLIXPearl River23 min
Aug 15, 4:09 PM CDTSpecial Weather StatementLIXHarrison36 min
Aug 15, 4:14 PM CDTSpecial Weather StatementLIXPearl River31 min
Aug 15, 4:20 PM CDTSpecial Weather StatementLIXJackson40 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2023Every severe thunderstorm warning in 2023

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.