Alert archive / Mississippi / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 120, NWS New Orleans, LA

July 21, 2017Amite County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 21, 2017, 6:46 PM CDT for Amite County, Mississippi. It was in force for 29 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 21, 2017, 6:46 PM CDT (23:46 UTC)
Expired
Jul 21, 2017, 7:15 PM CDT
In force
29 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Amite County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.8 hours before the alert went out and 145 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, Jackson, MS at 12:00Z on 2017-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1247 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, Jackson, MS at 12:00Z on 2017-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
1247 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1256 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
42 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 21, 4:07 AM CDTSpecial Marine WarningLIX53 min
Jul 21, 5:10 AM CDTSpecial Marine WarningLIX65 min
Jul 21, 8:59 AM CDTSpecial Marine WarningLIX61 min
Jul 21, 12:36 PM CDTSpecial Weather StatementLIXOrleans39 min
Jul 21, 1:32 PM CDTSpecial Weather StatementLIXLafourche28 min
Jul 21, 1:58 PM CDTSpecial Weather StatementLIXSaint Tammany32 min
Jul 21, 2:44 PM CDTSpecial Weather StatementLIXOrleans31 min
Jul 21, 3:38 PM CDTSpecial Weather StatementLIXWashington37 min
Jul 21, 3:40 PM CDTSpecial Weather StatementLIXAscension35 min
Jul 21, 4:20 PM CDTSpecial Weather StatementLIXAscension, East Baton Rouge40 min
Jul 21, 4:22 PM CDTSpecial Weather StatementLIXIberville38 min
Jul 21, 5:08 PM CDTSpecial Weather StatementLIXIberville37 min
Jul 21, 5:11 PM CDTSpecial Weather StatementLIXEast Feliciana34 min
Jul 21, 1:23 PM CDTSpecial Weather StatementLIXHancock37 min
Jul 21, 5:58 PM CDTSpecial Weather StatementLIXAmite, Pike, Walthall62 min
Jul 21, 6:39 PM CDTSpecial Weather StatementLIXWilkinson66 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2017Every severe thunderstorm warning in 2017

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.