Alert archive / Mississippi / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

March 17, 2021Jackson County, Mississippi

NWS New Orleans, LA issued this special weather statement at Mar 17, 2021, 10:38 PM CDT for Jackson County, Mississippi. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 17, 2021, 10:38 PM CDT (03:38 UTC)
Expired: Mar 17, 2021, 11:45 PM CDT
In force: 67 min
Issued by: NWS New Orleans, LA

County Jackson County, MS

The radar

The Mobile radar (KMOB), 44 km from the middle of the area, began a volume at 03:41 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 00:00Z, 3.6 hours before the alert went out and 109 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1681 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 710 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 9.7

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Mar 17, 10:12 PM CDT, 26 minutes earlier.

Area forecast discussion, Mar 17, 10:12 PM CDT, 26 minutes before

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In the hours before

Local storm report, Mar 17, 9:04 PM CDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
904 PM CDT WED MAR 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0543 PM     TSTM WND DMG     WALKER                  30.48N 90.87W
03/17/2021                   LIVINGSTON         LA   PUBLIC

            CAJUN NAVY VIA SOCIAL MEDIA REPORTS ROOF DAMAGE TO A
            HOME. TIME ESTIMATED BY RADAR.

&&

BL

Special weather statement, Mar 17, 9:17 PM CDT, 1 hour 21 minutes before

Special Weather Statement
National Weather Service New Orleans LA
917 PM CDT Wed Mar 17 2021

LAZ040-MSZ080-081-180315-
St. Tammany-Harrison-Hancock-
917 PM CDT Wed Mar 17 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN ST.
TAMMANY PARISH...HARRISON AND HANCOCK COUNTIES...

At 916 PM CDT, radar indicated strong thunderstorms were located
along a line extending from Kiln to near Pearlington. Movement was
northeast at 45 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
Gulfport, Biloxi, Slidell, Long Beach, Bay St. Louis, Waveland,
Diamondhead, Kiln, Pearlington, Lyman, Shoreline Park, Stennis Space
Center and Gulfport Airport.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3038 8901 3030 8929 3036 8928 3037 8935
      3034 8938 3034 8934 3032 8932 3025 8942
      3018 8945 3019 8948 3017 8958 3018 8961
      3016 8966 3018 8968 3018 8976 3022 8981
      3051 8959 3062 8888
TIME...MOT...LOC 0216Z 242DEG 39KT 3043 8943 3019 8958

KLG

Special weather statement, Mar 17, 9:19 PM CDT, 1 hour 19 minutes before

Special Weather Statement
National Weather Service New Orleans LA
919 PM CDT Wed Mar 17 2021

LAZ059-061>064-068>070-180315-
Orleans-Lower Plaquemines-Upper St. Bernard-Lower Jefferson-Lower St.
Bernard-Upper Lafourche-Upper Plaquemines-Upper Jefferson-
919 PM CDT Wed Mar 17 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ST. BERNARD...
ORLEANS...EAST CENTRAL LAFOURCHE...CENTRAL JEFFERSON AND NORTHWESTERN
PLAQUEMINES PARISHES...

At 919 PM CDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles northeast of Violet to 8 miles
northeast of Cut Off. Movement was east at 35 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
New Orleans, Chalmette, Harvey, East New Orleans, Timberlane, Belle
Chasse, Port Sulphur, Gretna, Jean Lafitte, Lake Catherine, Woodmere,
Violet, Terrytown, Lafitte, Meraux, Poydras, Myrtle Grove, Pointe A
La Hache, Estelle and Shell Beach.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 2956 9033 3015 8988 3015 8963 3000 8985
      2987 8970 3008 8948 2989 8937 2989 8923
      2982 8942 2976 8929 2978 8936 2979 8947
      2966 8945 2975 8965 2973 8961 2963 8949
      2961 8973 2956 8971 2954 8969
TIME...MOT...LOC 0219Z 256DEG 30KT 2994 8978 2961 9023

KLG

Local storm report, Mar 17, 9:33 PM CDT, 1 hour 5 minutes before

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Local storm report, Mar 17, 9:38 PM CDT, 1 hour before

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Special weather statement, Mar 17, 10:38 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 7:25 PM CDT	Special Weather Statement	LIX	Saint Charles, Saint James, Saint John the Baptist	50 min
Mar 17, 7:58 PM CDT	Special Marine Warning	LIX		62 min
Mar 17, 8:17 PM CDT	Special Weather Statement	LIX	Orleans, Saint Charles	58 min
Mar 17, 8:53 PM CDT	Special Marine Warning	LIX		67 min
Mar 17, 9:19 PM CDT	Special Weather Statement	LIX	Orleans	56 min
Mar 17, 9:53 PM CDT	Special Marine Warning	LIX		67 min
Mar 17, 10:56 PM CDT	Special Marine Warning	LIX		94 min
Mar 18, 12:22 AM CDT	Special Marine Warning	LIX		83 min
Mar 18, 1:44 AM CDT	Special Marine Warning	LIX		61 min
Mar 18, 10:35 AM CDT	River Flood Warning	LIX	Saint Tammany, Washington	60 days
Mar 17, 8:00 PM CDT	Special Weather Statement	LIX	Hancock, Pearl River	45 min
Mar 17, 8:20 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison, Pearl River	26 min
Mar 17, 8:49 PM CDT	Special Weather Statement	LIX	Hancock	26 min
Mar 17, 9:17 PM CDT	Special Weather Statement	LIX	Hancock, Harrison	58 min
Mar 17, 9:54 PM CDT	Severe Thunderstorm Warning	LIX	Harrison, Jackson	51 min

Nearby

Special Weather Statements in Mississippi, 2021 Every special weather statement in 2021

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.