Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 90, NWS New Orleans, LA

May 4, 2021Amite County, Wilkinson County, Mississippi; East Feliciana Parish, Pointe Coupee Parish, West Feliciana Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 4, 2021, 2:58 PM CDT for Amite County, Wilkinson County, Mississippi; East Feliciana Parish, Pointe Coupee Parish, West Feliciana Parish, Louisiana. It was in force for 47 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: May 4, 2021, 2:58 PM CDT (19:58 UTC)
Expired: May 4, 2021, 3:45 PM CDT
In force: 47 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties East Feliciana Parish, LA, Pointe Coupee Parish, LA, West Feliciana Parish, LA, Amite County, MS, Wilkinson County, MS

The watch it was issued in

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

Issued	Product	Office	Lasted
May 4, 10:52 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.0 hours before the alert went out and 155 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: 2428 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 13.2

Open this sounding in Storm Lab

The text

As transmitted.

765 
WUUS54 KLIX 041958
SVRLIX
LAC037-077-125-MSC005-157-042045-
/O.NEW.KLIX.SV.W.0090.210504T1958Z-210504T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
258 PM CDT Tue May 4 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Northeastern West Feliciana Parish in southeastern Louisiana...
  Northeastern Pointe Coupee Parish in southeastern Louisiana...
  East Feliciana Parish in southeastern Louisiana...
  Eastern Wilkinson County in southern Mississippi...
  Amite County in southern Mississippi...

* Until 345 PM CDT.

* At 257 PM CDT, severe thunderstorms were located along a line
  extending from near Garden City to near St. Francisville, moving
  east at 45 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...
  Jackson, Clinton, Liberty, Centreville, Woodville, Slaughter,
  Gloster, Wilson, Norwood, Wakefield, Smithdale, Spillman, Felps and
  Crosby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 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 3134 9115 3132 9112 3134 9106 3133 9106
      3133 9103 3135 9102 3133 9099 3135 9098
      3135 9055 3071 9109 3071 9112 3088 9157
      3135 9119
TIME...MOT...LOC 1957Z 248DEG 41KT 3133 9104 3082 9143 

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

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 4:11 AM CDT	Flash Flood Watch	LIX	Amite, Pearl River, Pike, Walthall, Wilkinson	33 hr
May 4, 2:15 PM CDT	Special Weather Statement	LIX	Wilkinson	30 min
May 4, 2:26 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	64 min
May 4, 3:33 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike, Walthall, Wilkinson	42 min
May 4, 4:10 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike, Walthall	65 min
May 4, 5:32 PM CDT	Special Weather Statement	LIX	Pearl River	43 min
May 4, 9:54 AM CDT	River Flood Warning	LIX	Tangipahoa	21 days
May 4, 4:24 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, West Baton Rouge and 1 more	97 min
May 4, 4:37 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa, Washington	106 min
May 4, 4:56 PM CDT	Special Weather Statement	LIX	Tangipahoa, Washington	34 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Severe Thunderstorm Warnings in Mississippi, 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.