Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 8, NWS New Orleans, LA

January 21, 2017Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Jan 21, 2017, 2:20 AM CST for Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 25 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: Jan 21, 2017, 2:20 AM CST (08:20 UTC)
Expired: Jan 21, 2017, 2:45 AM CST
In force: 25 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Livingston Parish, LA, Saint Helena Parish, LA, Tangipahoa 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
Jan 20, 11:00 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.3 hours before the alert went out and 92 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: 628 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

416 
WFUS54 KLIX 210820
TORLIX
LAC063-091-105-210845-
/O.NEW.KLIX.TO.W.0008.170121T0820Z-170121T0845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New Orleans LA
220 AM CST SAT JAN 21 2017

The National Weather Service in New Orleans has issued a

* Tornado Warning for...
  Northern Tangipahoa Parish in southeastern Louisiana...
  North central Livingston Parish in southeastern Louisiana...
  Southeastern St. Helena Parish in southeastern Louisiana...

* Until 245 AM CST
    
* At 220 AM CST, a severe thunderstorm capable of producing a tornado
  was located near Montpelier, or 11 miles southwest of Amite, moving
  northeast at 45 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Independence around 230 AM CST. 
  Amite and Amite City around 235 AM CST. 
  Roseland around 240 AM CST. 
  Wilmer around 245 AM CST. 

Other locations impacted by this tornadic thunderstorm include
Tangipahoa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3082 9029 3080 9029 3055 9064 3062 9072
      3100 9043
TIME...MOT...LOC 0820Z 219DEG 39KT 3062 9064 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

2 follow-up statements

361 
WWUS54 KLIX 210827
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
227 AM CST SAT JAN 21 2017

LAC063-210837-
/O.CAN.KLIX.TO.W.0008.000000T0000Z-170121T0845Z/
Livingston LA-
227 AM CST SAT JAN 21 2017

...THE TORNADO WARNING FOR NORTH CENTRAL LIVINGSTON PARISH IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 700 AM CST for southeastern
Louisiana...and southern Mississippi.

LAT...LON 3082 9029 3080 9029 3065 9051 3068 9067
      3100 9043
TIME...MOT...LOC 0827Z 219DEG 39KT 3068 9058 

$$

LAC091-105-210845-
/O.CON.KLIX.TO.W.0008.000000T0000Z-170121T0845Z/
Tangipahoa LA-St. Helena LA-
227 AM CST SAT JAN 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 AM CST FOR NORTHERN
TANGIPAHOA AND SOUTHEASTERN ST. HELENA PARISHES...
    
At 227 AM CST, a severe thunderstorm capable of producing a tornado
was located near Montpelier, or near Amite, moving northeast at 45
mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Roseland around 235 AM CST. 
  Wilmer around 245 AM CST. 

Other locations impacted by this tornadic thunderstorm include
Tangipahoa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3082 9029 3080 9029 3065 9051 3068 9067
      3100 9043
TIME...MOT...LOC 0827Z 219DEG 39KT 3068 9058 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

677 
WWUS54 KLIX 210834
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
234 AM CST SAT JAN 21 2017

LAC091-210844-
/O.CAN.KLIX.TO.W.0008.000000T0000Z-170121T0845Z/
St. Helena LA-
234 AM CST SAT JAN 21 2017

...THE TORNADO WARNING FOR SOUTHEASTERN ST. HELENA PARISH IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 700 AM CST for southeastern
Louisiana.

LAT...LON 3082 9029 3078 9035 3069 9055 3072 9057
      3074 9057 3096 9041
TIME...MOT...LOC 0834Z 217DEG 37KT 3074 9054 

$$

LAC105-210845-
/O.CON.KLIX.TO.W.0008.000000T0000Z-170121T0845Z/
Tangipahoa LA-
234 AM CST SAT JAN 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 AM CST FOR NORTHERN
TANGIPAHOA PARISH...
    
At 234 AM CST, a severe thunderstorm capable of producing a tornado
was located over Amite City, moving northeast at 45 mph.

HAZARD...Tornado and quarter size hail. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Wilmer around 245 AM CST. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3082 9029 3078 9035 3069 9055 3072 9057
      3074 9057 3096 9041
TIME...MOT...LOC 0834Z 217DEG 37KT 3074 9054 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 20, 10:53 PM CST	Marine Dense Fog Advisory	LIX		4 hr
Jan 20, 11:01 PM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	29 min
Jan 20, 11:15 PM CST	Tornado Warning	LIX	Pointe Coupee, West Feliciana	30 min
Jan 20, 11:43 PM CST	Tornado Warning	LIX	West Feliciana	32 min
Jan 21, 1:06 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	24 min
Jan 21, 1:41 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	34 min
Jan 21, 1:51 AM CST	Special Weather Statement	LIX	Tangipahoa	39 min
Jan 21, 2:14 AM CST	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, West Feliciana	46 min
Jan 21, 2:28 AM CST	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	32 min
Jan 21, 2:48 AM CST	Tornado Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena	10 min
Jan 21, 2:57 AM CST	Severe Thunderstorm Warning	LIX	Washington	33 min
Jan 21, 2:57 AM CST	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa, Washington	48 min
Jan 21, 3:02 AM CST	Tornado Warning	LIX	Washington	13 min
Jan 21, 3:04 AM CST	Tornado Warning	LIX	Washington	15 min
Jan 21, 3:28 AM CST	Areal Flood Advisory	LIX	East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge	2 hr
Jan 21, 3:37 AM CST	Special Weather Statement	LIX	Saint Helena	38 min
Jan 21, 3:40 AM CST	Small Craft Advisory	LIX		35 hr
Jan 21, 4:45 AM CST	Special Weather Statement	LIX	Ascension, Livingston, Tangipahoa	60 min
Jan 21, 5:00 AM CST	Special Weather Statement	LIX	Washington	30 min
Jan 21, 5:22 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	38 min
Jan 21, 5:24 AM CST	Special Marine Warning	LIX		96 min
Jan 21, 6:08 AM CST	Severe Thunderstorm Warning	LIX	Jefferson, Orleans	37 min
Jan 21, 6:38 AM CST	Special Marine Warning	LIX		37 min
Jan 21, 10:58 AM CST	River Flood Warning	LIX	Saint Helena	33 hr
Jan 21, 11:03 AM CST	River Flood Warning	LIX	Saint Tammany	13 days
Jan 21, 3:44 PM CST	Gale Warning	LIX		41 hr
Jan 21, 4:33 PM CST	Special Weather Statement	LIX	Orleans	42 min
Jan 21, 4:51 PM CST	Special Marine Warning	LIX		24 min
Jan 21, 4:54 PM CST	Special Weather Statement	LIX	Saint John the Baptist	36 min
Jan 21, 4:56 PM CST	Severe Thunderstorm Warning	LIX	Saint Charles	19 min
Jan 21, 5:02 PM CST	Tornado Warning	LIX	Orleans	13 min
Jan 21, 5:11 PM CST	Tornado Warning	LIX	Saint Charles	7 min
Jan 21, 5:16 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	29 min
Jan 21, 5:20 PM CST	Special Marine Warning	LIX		40 min
Jan 21, 5:42 PM CST	Special Marine Warning	LIX		33 min
Jan 21, 5:47 PM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	28 min
Jan 21, 5:52 PM CST	Special Marine Warning	LIX		38 min

Nearby

Tornado Warnings in Louisiana, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.