Alert archive / Mississippi / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 5, NWS New Orleans, LA

March 17, 2021Washington Parish, Louisiana; Pearl River County, Walthall County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 17, 2021, 5:40 PM CDT for Washington Parish, Louisiana; Pearl River County, Walthall County, Mississippi. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 17, 2021, 5:40 PM CDT (22:40 UTC)
Expired: Mar 17, 2021, 6:11 PM CDT
In force: 31 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Washington Parish, LA, Pearl River County, MS, Walthall County, MS

What was reported inside it

Time	Report	Where	Remark
Mar 17, 5:48 PM CDT	TSTM WND DMG	3 Ne Franklinton, LA	NUMEROUS TREES AND POWER LINES DOWN, AND SOME ROOF DAMAGE TO SOME HOMES. DAMAGE WAS REPORTED PARSH-WIDE, BUT OCCURRED MOSTLY NORTH AND EAST OF FRANKLINTON.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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, 10.7 hours before the alert went out and 101 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.

100 
WUUS54 KLIX 172240
SVRLIX
LAC117-MSC109-147-172330-
/O.NEW.KLIX.SV.W.0005.210317T2240Z-210317T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
540 PM CDT Wed Mar 17 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Washington Parish in southeastern Louisiana...
  Walthall County in southern Mississippi...
  Northwestern Pearl River County in southern Mississippi...

* Until 630 PM CDT.

* At 540 PM CDT, severe thunderstorms were located along a line
  extending from near Jayess to near Enon, moving northeast at 50
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Bogalusa, Franklinton, Tylertown, Varnado, Salem, Crossroads,
  Dexter and Angie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for southeastern
Louisiana...and southern Mississippi.

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

&&

LAT...LON 3133 9008 3133 9004 3118 9003 3117 9000
      3114 9000 3113 8994 3107 8992 3107 8984
      3100 8983 3100 8963 3076 8963 3072 9025
      3099 9024 3135 9026 3135 9011
TIME...MOT...LOC 2240Z 245DEG 43KT 3130 9021 3074 9015 

HAIL...<.75IN
WIND...60MPH
 
$$

KLG

2 follow-up statements

191 
WWUS54 KLIX 172302
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
602 PM CDT Wed Mar 17 2021

LAC117-MSC109-147-172330-
/O.CON.KLIX.SV.W.0005.000000T0000Z-210317T2330Z/
Washington LA-Walthall MS-Pearl River MS-
602 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHEASTERN WASHINGTON PARISH...SOUTHEASTERN WALTHALL AND
NORTHWESTERN PEARL RIVER COUNTIES...

At 601 PM CDT, severe thunderstorms were located along a line
extending from near Oak Vale to near Bogalusa, moving northeast at 50
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Bogalusa, Varnado, Crossroads, Dexter and Angie. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for southeastern
Louisiana...and southern Mississippi.

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

&&

LAT...LON 3118 9003 3117 9000 3114 9000 3113 8994
      3107 8992 3107 8984 3100 8983 3100 8963
      3076 8963 3074 9007 3097 9002
TIME...MOT...LOC 2301Z 245DEG 43KT 3140 8995 3084 8989 

HAIL...<.75IN
WIND...60MPH
 
$$

KLG

429 
WWUS54 KLIX 172311
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
611 PM CDT Wed Mar 17 2021

LAC117-MSC109-147-172321-
/O.CAN.KLIX.SV.W.0005.000000T0000Z-210317T2330Z/
Washington LA-Walthall MS-Pearl River MS-
611 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON
PARISH...SOUTHEASTERN WALTHALL AND NORTHWESTERN PEARL RIVER COUNTIES
IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with these thunderstorms.

A Tornado Watch remains in effect until 900 PM CDT for southeastern
Louisiana...and southern Mississippi.

LAT...LON 3118 9003 3117 9000 3114 9000 3113 8994
      3107 8992 3107 8984 3100 8983 3100 8963
      3076 8963 3074 9007 3097 9002
TIME...MOT...LOC 2310Z 245DEG 43KT 3145 8983 3089 8977 

$$

KLG

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 3:33 AM CDT	Wind Advisory	LIX	Assumption, East Baton Rouge, Iberville, Saint Bernard, Saint James, Saint John the Baptist and 1 more	18 hr
Mar 17, 3:18 PM CDT	Special Weather Statement	LIX	Pointe Coupee, West Feliciana	42 min
Mar 17, 3:30 PM CDT	Tornado Warning	LIX	Pointe Coupee, West Feliciana	45 min
Mar 17, 4:05 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 1 more	40 min
Mar 17, 4:44 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Saint Helena, Tangipahoa	34 min
Mar 17, 4:50 PM CDT	Special Weather Statement	LIX	East Feliciana, Saint Helena	55 min
Mar 17, 5:06 PM CDT	Special Weather Statement	LIX	Ascension, Iberville	39 min
Mar 17, 5:11 PM CDT	Special Weather Statement	LIX	Ascension, Livingston, Tangipahoa	49 min
Mar 17, 5:29 PM CDT	Special Weather Statement	LIX	Washington	46 min
Mar 17, 5:59 PM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 2 more	3 hr
Mar 17, 6:05 PM CDT	Special Weather Statement	LIX	Livingston, Saint John the Baptist, Tangipahoa	55 min
Mar 17, 6:07 PM CDT	Special Marine Warning	LIX		53 min
Mar 17, 6:24 PM CDT	Areal Flood Advisory	LIX	Livingston, Saint John the Baptist, Saint Tammany, Tangipahoa	3 hr
Mar 17, 6:27 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Iberville, Lafourche, Saint James, Terrebonne	63 min
Mar 17, 6:54 PM CDT	Special Weather Statement	LIX	Saint Tammany	66 min
Mar 17, 6:58 PM CDT	Special Marine Warning	LIX		62 min
Mar 17, 4:08 PM CDT	Tornado Warning	LIX	Amite, Wilkinson	22 min
Mar 17, 6:12 PM CDT	Special Weather Statement	LIX	Pearl River	33 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2021 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.