Alert archive / Mississippi / Tornado Warnings in 2018

Tornado Warning 4, NWS New Orleans, LA

April 7, 2018Washington Parish, Louisiana; Pearl River County, Walthall County, Mississippi

NWS New Orleans, LA issued this tornado warning at Apr 7, 2018, 1:27 AM CDT for Washington Parish, Louisiana; Pearl River County, Walthall County, Mississippi. It was in force for 18 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: Apr 7, 2018, 1:27 AM CDT (06:27 UTC)
Expired: Apr 7, 2018, 1:45 AM CDT
In force: 18 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Washington Parish, LA, Pearl River County, MS, Walthall 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
Apr 6, 8:53 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.5 hours before the alert went out and 85 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: 933 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 780 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted.

276 
WFUS54 KLIX 070627
TORLIX
LAC117-MSC109-147-070700-
/O.NEW.KLIX.TO.W.0004.180407T0627Z-180407T0700Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New Orleans LA
127 AM CDT SAT APR 7 2018

The National Weather Service in New Orleans has issued a

* Tornado Warning for...
  Northeastern Washington Parish in southeastern Louisiana...
  Southeastern Walthall County in southern Mississippi...
  Northwestern Pearl River County in southern Mississippi...

* Until 200 AM CDT
    
* At 127 AM CDT, a severe thunderstorm capable of producing a tornado
  was located near Sandy Hook, moving east 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 tornadic thunderstorm will remain over mainly rural areas of
  northeastern Washington Parish...southeastern Walthall and
  northwestern Pearl River Counties, including the following
  locations: Angie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to 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 3109 8992 3107 8992 3108 8984 3100 8983
      3100 8955 3102 8955 3101 8950 3100 8950
      3100 8948 3098 8948 3098 8947 3087 8950
      3091 8995 3109 8994
TIME...MOT...LOC 0627Z 271DEG 41KT 3100 8986 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

TD

1 follow-up statement

061 
WWUS54 KLIX 070645
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
145 AM CDT SAT APR 7 2018

LAC117-MSC109-147-070655-
/O.CAN.KLIX.TO.W.0004.000000T0000Z-180407T0700Z/
Washington LA-Walthall MS-Pearl River MS-
145 AM CDT SAT APR 7 2018

...THE TORNADO WARNING FOR NORTHEASTERN WASHINGTON PARISH...
SOUTHEASTERN WALTHALL AND NORTHWESTERN PEARL RIVER COUNTIES IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 500 AM CDT for
southeastern Louisiana...and southern Mississippi.

LAT...LON 3109 8992 3107 8992 3108 8984 3100 8983
      3100 8955 3102 8955 3101 8950 3100 8950
      3100 8948 3098 8948 3098 8947 3087 8950
      3091 8995 3109 8994
TIME...MOT...LOC 0643Z 271DEG 41KT 3100 8963 

$$

TD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 12:29 AM CDT	Special Weather Statement	LIX	East Feliciana, Saint Helena, West Feliciana	46 min
Apr 7, 1:52 AM CDT	Special Weather Statement	LIX	Washington	38 min
Apr 7, 2:38 AM CDT	Special Weather Statement	LIX	West Baton Rouge	67 min
Apr 7, 3:28 AM CDT	Special Weather Statement	LIX	East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana	62 min
Apr 7, 3:47 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, West Baton Rouge	28 min
Apr 7, 4:34 AM CDT	Special Weather Statement	LIX	East Baton Rouge, Livingston	56 min
Apr 7, 4:54 AM CDT	Special Weather Statement	LIX	Ascension	51 min
Apr 7, 5:22 AM CDT	Special Weather Statement	LIX	Saint Charles, Saint James	23 min
Apr 7, 5:46 AM CDT	Tornado Warning	LIX	Jefferson, Saint Charles	29 min
Apr 7, 6:04 AM CDT	Special Marine Warning	LIX		41 min
Apr 7, 6:05 AM CDT	Special Weather Statement	LIX	Orleans	25 min
Apr 7, 6:39 AM CDT	Special Weather Statement	LIX	Jefferson, Plaquemines	66 min
Apr 7, 6:46 AM CDT	Special Marine Warning	LIX		59 min
Apr 7, 7:11 AM CDT	Special Weather Statement	LIX	Plaquemines	64 min
Apr 7, 7:13 AM CDT	Special Marine Warning	LIX		62 min
Apr 7, 7:47 AM CDT	Special Marine Warning	LIX		88 min
Apr 7, 8:00 AM CDT	Special Marine Warning	LIX		60 min
Apr 7, 8:43 AM CDT	River Flood Warning	LIX	Saint Tammany, Washington	28 days
Apr 7, 8:43 AM CDT	River Flood Warning	LIX	Saint Tammany	29 days
Apr 7, 8:47 AM CDT	Special Marine Warning	LIX		58 min
Apr 6, 11:00 PM CDT	Special Weather Statement	LIX	Wilkinson	45 min
Apr 6, 11:44 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike, Walthall, Wilkinson	61 min
Apr 6, 11:47 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	28 min
Apr 7, 12:52 AM CDT	Special Weather Statement	LIX	Pike, Walthall	38 min

Nearby

Tornado Warnings in Mississippi, 2018 Tornado Warnings in Louisiana, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.