Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 64, NWS Shreveport, LA

April 30, 2017Jackson Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 30, 2017, 3:09 AM CDT for Jackson Parish, Winn Parish, Louisiana. It was in force for 51 min. 3 reports 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: Apr 30, 2017, 3:09 AM CDT (08:09 UTC)
Expired: Apr 30, 2017, 4:00 AM CDT
In force: 51 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Jackson Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 114 km from the middle of the area, began a volume at 08:07 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 30, 3:15 AM CDT	TSTM WND DMG	4 Ese Dodson, LA	SEVERAL TREES WERE SNAPPED OR UPROOTED ALONG LOUISIANA STATE HIGHWAY 37, AUNT MARIES ROAD, AND LOUISIANA STATE HIGHWAY 126. ALTHOUGH THESE TREES WERE IN THE VICINITY OF THE TORNADO PATH, THESE TREES WERE ASSOCIATED WITH THUNDERSTORM WINDS AS THE TREES FELL TO
Apr 30, 3:23 AM CDT	TSTM WND DMG	3 W Sikes, LA	TREES DOWN AND SEVERAL HOMES WITH DAMAGE TO PORCHES OFF KETCHUM ROAD WEST OF SIKES.
Apr 30, 3:24 AM CDT	TSTM WND DMG	4 Wnw Sikes, LA	TREES DOWN IN AND ON THE GAARS MILLS ROAD AREA.

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
Apr 29, 10:23 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 8.2 hours before the alert went out and 128 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: 1748 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 454 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 19.0

Open this sounding in Storm Lab

The text

As transmitted.

944 
WFUS54 KSHV 300809
TORSHV
LAC049-127-300900-
/O.NEW.KSHV.TO.W.0064.170430T0809Z-170430T0900Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
309 AM CDT SUN APR 30 2017

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Eastern Jackson Parish in north central Louisiana...
  Northeastern Winn Parish in north central Louisiana...

* Until 400 AM CDT
    
* At 309 AM CDT, a severe thunderstorm capable of producing a 
  tornado was located just northeast of Winnfield, 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. 

* Locations impacted include...
  Winnfield, Chatham, Eros, Sikes, Joyce and Hudson. 

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3187 9248 3194 9271 3244 9246 3231 9231
      3208 9236
TIME...MOT...LOC 0809Z 202DEG 38KT 3198 9259 

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

$$

15

1 follow-up statement

000 
WWUS54 KSHV 300843
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
343 AM CDT SUN APR 30 2017

LAC127-300852-
/O.CAN.KSHV.TO.W.0064.000000T0000Z-170430T0900Z/
Winn LA-
343 AM CDT SUN APR 30 2017

...THE TORNADO WARNING FOR NORTHEASTERN WINN PARISH IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled. 
However, periods of heavy rainfall, gusty winds to 40 mph, and 
frequent lightning will continue across Winn Parish through at least 
4 AM. 

A severe thunderstorm watch remains in effect until 600 AM CDT for
north central Louisiana.

LAT...LON 3216 9235 3218 9254 3239 9241 3231 9231
TIME...MOT...LOC 0842Z 210DEG 33KT 3222 9241 

$$

LAC049-300900-
/O.CON.KSHV.TO.W.0064.000000T0000Z-170430T0900Z/
Jackson LA-
343 AM CDT SUN APR 30 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 AM CDT FOR
SOUTHEASTERN JACKSON PARISH...
    
At 343 AM CDT, a severe thunderstorm capable of producing a tornado 
was located 17 miles east of Jonesboro, moving northeast at 40 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. 

Locations impacted include...
Chatham.

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3216 9235 3218 9254 3239 9241 3231 9231
TIME...MOT...LOC 0842Z 210DEG 33KT 3222 9241 

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

$$

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 11:39 PM CDT	Special Weather Statement	SHV	Sabine	51 min
Apr 30, 1:18 AM CDT	Severe Thunderstorm Warning	SHV	Ouachita, Union	35 min
Apr 30, 1:29 AM CDT	Special Weather Statement	SHV	Bossier	46 min
Apr 30, 1:46 AM CDT	Special Weather Statement	SHV	LaSalle	44 min
Apr 30, 2:16 AM CDT	Special Weather Statement	SHV	Jackson, Winn	29 min
Apr 30, 3:19 AM CDT	Special Weather Statement	SHV	Union	41 min
Apr 30, 3:53 AM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Ouachita	52 min
Apr 30, 4:13 AM CDT	Areal Flood Advisory	SHV	Caldwell, Jackson, Lincoln, Ouachita, Union, Winn	3 hr
Apr 30, 4:19 AM CDT	Lake Wind Advisory	SHV	Bossier, Caddo, De Soto, Red River, Webster	15 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.