Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 82, NWS Shreveport, LA

May 28, 2017Grant Parish, Natchitoches Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at May 28, 2017, 8:18 PM CDT for Grant Parish, Natchitoches Parish, Louisiana. It was in force for 44 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 28, 2017, 8:18 PM CDT (01:18 UTC)
Expired: May 28, 2017, 9:02 PM CDT
In force: 44 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Grant Parish, LA, Natchitoches Parish, LA

The radar

The Ft Polk radar (KPOE), 56 km from the middle of the area, began a volume at 01:17 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.

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 28, 5:19 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 1.3 hours before the alert went out and 164 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: 2055 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 992 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

446 
WFUS54 KSHV 290118
TORSHV
LAC043-069-290215-
/O.NEW.KSHV.TO.W.0082.170529T0118Z-170529T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
818 PM CDT SUN MAY 28 2017

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southern Grant Parish in north central Louisiana...
  Southeastern Natchitoches Parish in northwestern Louisiana...

* Until 915 PM CDT
    
* At 818 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Lena, moving east at 35 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...
  Colfax, Pollock, Dry Prong, Lake Iatt, Chopin, Aloha, Fishville and
  Bentley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

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

&&

LAT...LON 3139 9266 3141 9267 3140 9270 3145 9268
      3145 9271 3147 9269 3152 9272 3139 9289
      3139 9295 3163 9288 3162 9237 3159 9231
      3157 9232 3153 9227 3149 9228 3151 9225
      3148 9224 3149 9224 3148 9220
TIME...MOT...LOC 0118Z 284DEG 32KT 3153 9283 

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

$$

06

1 follow-up statement

578 
WWUS54 KSHV 290202
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
902 PM CDT SUN MAY 28 2017

LAC043-069-290212-
/O.CAN.KSHV.TO.W.0082.000000T0000Z-170529T0215Z/
Grant LA-Natchitoches LA-
902 PM CDT SUN MAY 28 2017

...THE TORNADO WARNING FOR SOUTHERN GRANT AND SOUTHEASTERN
NATCHITOCHES PARISHES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has weakened. 
Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until midnight CDT for
north central and northwestern Louisiana.

LAT...LON 3139 9266 3141 9267 3140 9270 3145 9268
      3145 9271 3147 9269 3152 9272 3139 9289
      3139 9295 3163 9288 3162 9237 3159 9231
      3157 9232 3153 9227 3149 9228 3151 9225
      3148 9224 3149 9224 3148 9220
TIME...MOT...LOC 0200Z 284DEG 32KT 3143 9239 

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 7:02 PM CDT	Flash Flood Warning	SHV	De Soto, Red River, Sabine	3 hr
May 28, 7:09 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	51 min
May 28, 7:24 PM CDT	Tornado Warning	SHV	Natchitoches, Sabine	51 min
May 28, 7:30 PM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	60 min
May 28, 7:43 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Winn	62 min
May 28, 8:00 PM CDT	Flash Flood Warning	SHV	Bienville, Bossier, Claiborne, De Soto, Jackson, Lincoln and 6 more	3 hr
May 28, 8:05 PM CDT	Tornado Warning	SHV	Winn	40 min
May 28, 8:30 PM CDT	Tornado Warning	SHV	Caldwell, Grant, LaSalle, Winn	45 min
May 28, 8:39 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Grant, Jackson, LaSalle, Natchitoches, Ouachita and 1 more	66 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; radar from the NEXRAD Level II archive.