Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 131, NWS New Orleans, LA

November 27, 20204 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Nov 27, 2020, 4:58 PM CST for 4 parishes in 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 counties it named.

The facts

Issued: Nov 27, 2020, 4:58 PM CST (22:58 UTC)
Expired: Nov 27, 2020, 5:45 PM CST
In force: 47 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Ascension Parish, LA, Assumption Parish, LA, Iberville Parish, LA, Saint James Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.0 hours before the alert went out and 129 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: 314 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 730 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Nov 27, 4:47 PM CST, 11 minutes earlier.

Area forecast discussion, Nov 27, 4:47 PM CST, 11 minutes before

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In the hours before

Special weather statement, Nov 27, 11:06 AM CST, 5 hours 52 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1106 AM CST Fri Nov 27 2020

LAZ035-036-MSZ068-069-271745-
East Feliciana-West Feliciana-Wilkinson-Amite-
1106 AM CST Fri Nov 27 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN WEST FELICIANA AND
NORTHWESTERN EAST FELICIANA PARISHES...SOUTHEASTERN WILKINSON AND
SOUTHWESTERN AMITE COUNTIES...

At 1106 AM CST, a strong thunderstorm was located over Wakefield, or
near St. Francisville, moving northeast at 25 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Jackson, St. Francisville, Centreville, Wilson, Norwood, Wakefield
and Spillman.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3079 9143 3090 9150 3117 9110 3094 9094
TIME...MOT...LOC 1706Z 240DEG 22KT 3088 9140

PG

Special weather statement, Nov 27, 11:43 AM CST, 5 hours 15 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1143 AM CST Fri Nov 27 2020

LAZ035-036-MSZ068-069-271830-
East Feliciana-West Feliciana-Wilkinson-Amite-
1143 AM CST Fri Nov 27 2020

...A STRONG THUNDERSTORM WILL AFFECT EASTERN WEST FELICIANA AND
NORTHEASTERN EAST FELICIANA PARISHES...SOUTHEASTERN WILKINSON AND
SOUTHWESTERN AMITE COUNTIES...

At 1143 AM CST, a strong thunderstorm was located near Norwood, or 9
miles north of Jackson, moving northeast at 25 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Liberty, Centreville, Wilson, Norwood and Felps.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3101 9071 3100 9077 3100 9083 3098 9085
      3089 9120 3099 9126 3125 9085
TIME...MOT...LOC 1743Z 243DEG 22KT 3097 9116

PG

Special weather statement, Nov 27, 12:28 PM CST, 4 hours 30 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1228 PM CST Fri Nov 27 2020

MSZ069-070-271915-
Pike-Amite-
1228 PM CST Fri Nov 27 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN PIKE AND
SOUTHEASTERN AMITE COUNTIES...

At 1228 PM CST, a strong thunderstorm was located 7 miles north of
Felps, or 7 miles southwest of Liberty, moving east at 25 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Liberty, Magnolia and Gillsberg.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3104 9043 3100 9089 3100 9095 3113 9100
      3133 9055
TIME...MOT...LOC 1828Z 249DEG 21KT 3108 9090

PG

Special weather statement, Nov 27, 3:33 PM CST, 1 hour 25 minutes before

Special Weather Statement
National Weather Service New Orleans LA
333 PM CST Fri Nov 27 2020

LAZ039-071-MSZ070-071-272200-
Washington-Northern Tangipahoa-Pike-Walthall-
333 PM CST Fri Nov 27 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN WASHINGTON
PARISH...WALTHALL AND EASTERN PIKE COUNTIES...

At 333 PM CST, radar indicated strong thunderstorms were located
along a line extending from 6 miles south of Ruth to 6 miles
northwest of Tylertown to near Mount Herman. Movement was east at 40
mph.

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

Locations impacted include...
Tylertown, Salem, Dexter, Mount Herman and Angie.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3133 9008 3134 9004 3118 9003 3117 9000
      3114 9000 3113 8994 3107 8992 3107 8984
      3101 8984 3100 8981 3091 8984 3094 9038
      3116 9032 3135 9039 3135 9011
TIME...MOT...LOC 2133Z 265DEG 34KT 3130 9028 3117 9024 3102 9028

PG

Local storm report, Nov 27, 3:59 PM CST, 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
359 PM CST FRI NOV 27 2020

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

0300 PM     TSTM WND DMG     4 S MCCOMB              31.19N 90.47W
11/27/2020                   PIKE               MS   EMERGENCY MNGR

            POSSIBLE TORNADO REPORTED SOUTH OF MCCOMB. TREES REPORTED
            DOWN IN PERCY QUIN STATE PARK AND ACROSS HIGHWAY 48.
            HANGAR AND AIRCRAFT DAMAGED AT MCCOMB AIRPORT.

&&

PGRIGSBY

Special weather statement, Nov 27, 4:20 PM CST, 38 minutes before

Special Weather Statement
National Weather Service New Orleans LA
420 PM CST Fri Nov 27 2020

LAZ039-MSZ071-077-272300-
Washington-Walthall-Pearl River-
420 PM CST Fri Nov 27 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT WASHINGTON PARISH...
SOUTHEASTERN WALTHALL AND NORTHWESTERN PEARL RIVER COUNTIES...

At 419 PM CST, radar indicated strong thunderstorms were located
along a line extending from near Goss to near Pickwick to near
Franklinton. Movement was east at 25 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

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

If outdoors, consider seeking shelter inside a building.

LAT...LON 3107 8992 3107 8984 3100 8983 3100 8975
      3101 8950 3069 8977 3072 9025 3075 9026
      3114 8995
TIME...MOT...LOC 2219Z 267DEG 23KT 3132 8987 3118 8985 3079 9017

PG

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 26, 8:00 PM CST	Special Marine Warning	LIX		60 min
Nov 27, 3:37 AM CST	Marine Dense Fog Advisory	LIX		7 hr
Nov 27, 3:38 AM CST	Dense Fog Advisory	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 7 more	5 hr
Nov 27, 11:06 AM CST	Special Weather Statement	LIX	West Feliciana	39 min
Nov 27, 4:15 PM CST	Severe Thunderstorm Warning	LIX	Iberville	45 min
Nov 27, 4:20 PM CST	Special Weather Statement	LIX	Washington	40 min
Nov 27, 5:45 PM CST	Special Weather Statement	LIX	Saint James	60 min
Nov 26, 6:35 PM CST	Special Weather Statement	LIX	Stone	55 min
Nov 26, 6:54 PM CST	Special Weather Statement	LIX	Hancock	36 min
Nov 26, 7:29 PM CST	Special Weather Statement	LIX	Harrison	46 min
Nov 26, 8:21 PM CST	Special Weather Statement	LIX	Jackson	54 min
Nov 26, 8:43 PM CST	Severe Thunderstorm Warning	LIX	Jackson	32 min
Nov 27, 11:43 AM CST	Special Weather Statement	LIX	Amite	47 min
Nov 27, 12:28 PM CST	Special Weather Statement	LIX	Amite	47 min
Nov 27, 3:33 PM CST	Special Weather Statement	LIX	Walthall	27 min
Nov 27, 4:43 PM CST	Tornado Warning	LIX	Pearl River	20 min
Nov 27, 4:50 PM CST	Tornado Warning	LIX	Hancock, Pearl River	25 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2020 Every severe thunderstorm warning in 2020

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.