Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Lake Charles, LA

March 17, 2021Iberia Parish, Saint Martin Parish, St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Mar 17, 2021, 6:21 PM CDT for Iberia Parish, Saint Martin Parish, St. Mary Parish, Louisiana. It was in force for 39 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, 6:21 PM CDT (23:21 UTC)
Expired: Mar 17, 2021, 7:00 PM CDT
In force: 39 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Iberia Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 17, 2:38 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.4 hours before the alert went out and 162 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: 1786 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 396 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 9.9

Open this sounding in Storm Lab

The text

As transmitted.

806 
WUUS54 KLCH 172321
SVRLCH
LAC045-099-101-180000-
/O.NEW.KLCH.SV.W.0008.210317T2321Z-210318T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lake Charles LA
621 PM CDT Wed Mar 17 2021

The National Weather Service in Lake Charles has issued a

* Severe Thunderstorm Warning for...
  Northeastern Iberia Parish in south central Louisiana...
  Northeastern St. Mary Parish in south central Louisiana...
  Southeastern St. Martin Parish in south central Louisiana...

* Until 700 PM CDT.

* At 621 PM CDT, severe thunderstorms were located along a line
  extending from near Bayou Sorrel to near Pierre Part to near
  Patterson Memorial Airport to Ellerslie, moving northeast at 35
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Morgan City, Franklin, Patterson, Berwick, Stephensville, Bayou
  Vista, Ellerslie, Patterson Memorial Airport, Amelia and
  Centerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for south central
Louisiana.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2959 9116 2961 9118 2959 9122 2959 9141
      2963 9140 2963 9141 2958 9143 2958 9154
      2975 9157 2992 9141 3006 9137 3006 9127
      3004 9124 3004 9123 3000 9126 2996 9125
      2986 9120 2980 9109 2964 9111 2963 9108
TIME...MOT...LOC 2321Z 247DEG 31KT 3011 9135 2993 9123 2977 9134 2966
9153

HAIL...1.00IN
WIND...60MPH
 
$$

Landreneau

1 follow-up statement

471 
WWUS54 KLCH 172340
SVSLCH

Severe Weather Statement
National Weather Service Lake Charles LA
640 PM CDT Wed Mar 17 2021

LAC045-172350-
/O.CAN.KLCH.SV.W.0008.000000T0000Z-210318T0000Z/
Iberia LA-
640 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN IBERIA PARISH IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for south central
Louisiana.

LAT...LON 2961 9112 2962 9115 2959 9122 2959 9141
      2963 9140 2963 9141 2961 9143 2958 9143
      2958 9153 2971 9156 2972 9156 2993 9138
      2997 9133 2997 9125 2986 9120 2980 9109
      2964 9111 2963 9108
TIME...MOT...LOC 2340Z 290DEG 25KT 2999 9102 2974 9116 2946 9152 

$$

LAC099-101-180000-
/O.CON.KLCH.SV.W.0008.000000T0000Z-210318T0000Z/
St. Mary LA-St. Martin LA-
640 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR NORTHEASTERN ST. MARY AND SOUTHEASTERN ST. MARTIN PARISHES...

At 640 PM CDT, severe thunderstorms were located along a line
extending from near Paincourtville to near Stephensville to 7 miles
south of Burns Point, moving east at 30 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Morgan City, Franklin, Patterson, Berwick, Stephensville, Bayou
Vista, Ellerslie, Patterson Memorial Airport, Amelia, Pierre Part and
Centerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for south central
Louisiana.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2961 9112 2962 9115 2959 9122 2959 9141
      2963 9140 2963 9141 2961 9143 2958 9143
      2958 9153 2971 9156 2972 9156 2993 9138
      2997 9133 2997 9125 2986 9120 2980 9109
      2964 9111 2963 9108
TIME...MOT...LOC 2340Z 290DEG 25KT 2999 9102 2974 9116 2946 9152 

HAIL...0.88IN
WIND...60MPH
 
$$

Landreneau

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 17, 2:53 AM CDT	Wind Advisory	LCH	Avoyelles, Cameron, Evangeline, Lafayette, Saint Landry, Saint Martin	16 hr
Mar 17, 2:55 AM CDT	Marine Dense Fog Advisory	LCH		11 hr
Mar 17, 2:55 AM CDT	Small Craft Advisory	LCH		52 hr
Mar 17, 12:39 PM CDT	Special Weather Statement	LCH	Cameron	51 min
Mar 17, 12:48 PM CDT	Special Weather Statement	LCH	Calcasieu	42 min
Mar 17, 1:24 PM CDT	Severe Thunderstorm Warning	LCH	Acadia, Cameron, Jefferson Davis, Vermilion	36 min
Mar 17, 1:33 PM CDT	Special Marine Warning	LCH		57 min
Mar 17, 1:40 PM CDT	Special Weather Statement	LCH	Allen	35 min
Mar 17, 1:46 PM CDT	Special Weather Statement	LCH	Vernon	29 min
Mar 17, 2:01 PM CDT	Special Weather Statement	LCH	Acadia, Jefferson Davis	44 min
Mar 17, 2:30 PM CDT	Special Marine Warning	LCH		60 min
Mar 17, 2:32 PM CDT	Special Weather Statement	LCH	Beauregard	43 min
Mar 17, 2:41 PM CDT	Small Craft Advisory	LCH		40 hr
Mar 17, 3:03 PM CDT	Special Weather Statement	LCH	Vermilion	42 min
Mar 17, 3:28 PM CDT	Special Marine Warning	LCH		62 min
Mar 17, 3:42 PM CDT	Special Weather Statement	LCH	Rapides	48 min
Mar 17, 3:44 PM CDT	Special Weather Statement	LCH	Saint Martin	46 min
Mar 17, 3:53 PM CDT	Severe Thunderstorm Warning	LCH	Iberia, Saint Martin, St. Mary	52 min
Mar 17, 3:58 PM CDT	Severe Thunderstorm Warning	LCH	Cameron, Vermilion	62 min
Mar 17, 4:19 PM CDT	Severe Thunderstorm Warning	LCH	Acadia, Cameron, Jefferson Davis, Vermilion	44 min
Mar 17, 4:35 PM CDT	Special Marine Warning	LCH		55 min
Mar 17, 4:49 PM CDT	Special Weather Statement	LCH	Saint Martin	41 min
Mar 17, 5:00 PM CDT	Special Weather Statement	LCH	Acadia, Saint Landry	30 min
Mar 17, 5:31 PM CDT	Special Marine Warning	LCH		89 min
Mar 17, 6:08 PM CDT	Special Weather Statement	LCH	Iberia, St. Mary	97 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Every severe thunderstorm warning 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.