Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

December 6, 2021Saint Helena Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Dec 6, 2021, 12:01 PM CST for Saint Helena Parish, Louisiana. It was in force for 74 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: Dec 6, 2021, 12:01 PM CST (18:01 UTC)
Expired: Dec 6, 2021, 1:15 PM CST
In force: 74 min
Issued by: NWS New Orleans, LA
Hail: 0.00 in
Wind: 50

County Saint Helena Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.0 hours before the alert went out and 135 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: 720 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 680 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.4

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 Dec 6, 3:35 AM CST, 8 hours 26 minutes earlier.

Area forecast discussion, Dec 6, 3:35 AM CST, 8 hours 26 minutes before

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  <meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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In the hours before

Special weather statement, Dec 6, 9:52 AM CST, 2 hours 9 minutes before

Special Weather Statement
National Weather Service New Orleans LA
952 AM CST Mon Dec 6 2021

LAZ034-035-MSZ068-061645-
Pointe Coupee LA-West Feliciana LA-Wilkinson MS-
952 AM CST Mon Dec 6 2021

...A strong thunderstorm will impact portions of northern West
Feliciana, northwestern Pointe Coupee Parishes in southeastern
Louisiana and southern Wilkinson Counties through 1045 AM CST...

At 951 AM CST, Doppler radar was tracking a strong thunderstorm over
Simmesport, moving east at 35 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Woodville, Wakefield, Fort Adams, Lettsworth and Spillman.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3104 9172 3104 9165 3097 9166 3100 9163
      3104 9156 3107 9157 3113 9163 3116 9159
      3120 9106 3099 9118 3088 9123 3092 9180
      3097 9181
TIME...MOT...LOC 1551Z 264DEG 29KT 3102 9179

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

CAB

Special weather statement, Dec 6, 11:08 AM CST, 53 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1108 AM CST Mon Dec 6 2021

LAZ035-036-MSZ068-069-061815-
East Feliciana LA-West Feliciana LA-Wilkinson MS-Amite MS-
1108 AM CST Mon Dec 6 2021

...A strong thunderstorm will impact portions of northeastern West
Feliciana and East Feliciana Parishes, southeastern Wilkinson and
southwestern Amite Counties through 1215 PM CST...

At 1108 AM CST, Doppler radar was tracking a strong thunderstorm over
Spillman, or 8 miles northwest of Jackson, moving east at 35 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Jackson, Clinton, Centreville, Wilson, Norwood, Wakefield, Spillman
and Felps.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3111 9083 3099 9083 3095 9085 3095 9086
      3089 9085 3086 9086 3084 9084 3083 9085
      3082 9084 3075 9085 3088 9143 3103 9135
TIME...MOT...LOC 1708Z 270DEG 29KT 3094 9129

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

CAB

Special weather statement, Dec 6, 12:01 PM CST, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1201 PM CST Mon Dec 6 2021

LAZ036-037-MSZ069-061915-
St. Helena LA-East Feliciana LA-Amite MS-
1201 PM CST Mon Dec 6 2021

...A strong thunderstorm will impact portions of northern St. Helena,
northeastern East Feliciana Parishes in southeastern Louisiana and
southern Amite Counties through 115 PM CST...

At 1200 PM CST, Doppler radar was tracking a strong thunderstorm near
Felps, or near Clinton, moving east 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...
Clinton, Greensburg, Wilson, Norwood, Felps, Darlington, Gillsberg
and Easleyville.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3100 9055 3100 9057 3077 9057 3088 9118
      3100 9108 3100 9106 3102 9106 3104 9104
      3110 9055
TIME...MOT...LOC 1800Z 270DEG 17KT 3093 9094

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

CAB

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 6, 11:08 AM CST	Special Weather Statement	LIX	East Feliciana	67 min
Dec 6, 12:21 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena	54 min
Dec 6, 12:46 PM CST	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	59 min
Dec 6, 1:22 PM CST	Tornado Warning	LIX	Tangipahoa, Washington	68 min
Dec 6, 1:29 PM CST	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa, Washington	61 min
Dec 6, 1:40 PM CST	Special Weather Statement	LIX	Saint Helena	65 min
Dec 6, 1:44 PM CST	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena	61 min
Dec 6, 1:54 PM CST	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa	66 min
Dec 6, 2:21 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	39 min
Dec 6, 2:24 PM CST	Tornado Warning	LIX	Washington	21 min
Dec 6, 2:30 PM CST	Severe Thunderstorm Warning	LIX	Livingston, Saint Tammany, Tangipahoa	60 min
Dec 6, 2:35 PM CST	Tornado Warning	LIX	Saint Tammany, Washington	55 min
Dec 6, 2:41 PM CST	Special Marine Warning	LIX		64 min
Dec 6, 2:51 PM CST	Flash Flood Warning	LIX	Ascension, East Baton Rouge, West Baton Rouge	116 min
Dec 6, 2:51 PM CST	Tornado Warning	LIX	Saint Tammany	39 min
Dec 6, 2:56 PM CST	Tornado Warning	LIX	Saint Tammany	49 min
Dec 6, 3:09 PM CST	Severe Thunderstorm Warning Considerable damage threat	LIX	Saint Tammany	66 min
Dec 6, 3:20 PM CST	Tornado Warning	LIX	Saint Tammany	30 min
Dec 6, 3:26 PM CST	Special Marine Warning	LIX		64 min
Dec 6, 4:14 PM CST	Special Marine Warning	LIX		91 min
Dec 6, 5:24 PM CST	Special Marine Warning	LIX		66 min
Dec 6, 9:52 AM CST	Special Weather Statement	LIX	Wilkinson	53 min
Dec 6, 3:31 PM CST	Tornado Warning	LIX	Pearl River	7 min
Dec 6, 3:36 PM CST	Tornado Warning	LIX	Hancock	28 min
Dec 6, 4:07 PM CST	Special Weather Statement	LIX	Harrison	23 min

Nearby

Special Weather Statements in Louisiana, 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.