Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 83, NWS Shreveport, LA

May 28, 20174 parishes in Louisiana

NWS Shreveport, LA issued this tornado warning at May 28, 2017, 8:30 PM CDT for 4 parishes in Louisiana. It was in force for 45 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, 8:30 PM CDT (01:30 UTC)
Expired: May 28, 2017, 9:15 PM CDT
In force: 45 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Caldwell Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 84 km from the middle of the area, began a volume at 01:34 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, 1.5 hours before the alert went out and 195 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.

427 
WFUS54 KSHV 290130
TORSHV
LAC021-043-059-127-290215-
/O.NEW.KSHV.TO.W.0083.170529T0130Z-170529T0215Z/

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

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Northeastern Grant Parish in north central Louisiana...
  Southwestern Caldwell Parish in north central Louisiana...
  La Salle Parish in north central Louisiana...
  Southeastern Winn Parish in north central Louisiana...

* Until 915 PM CDT
    
* At 830 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles southeast of Winnfield, 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...
  Jena, Olla, Midway, Urania, Tullos, Georgetown, Zenoria, Lake Iatt,
  Burlington, Standard, Williana and Rochelle.

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 3162 9272 3195 9258 3192 9201 3158 9201
TIME...MOT...LOC 0130Z 284DEG 32KT 3182 9255 

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

$$

06

1 follow-up statement

343 
WWUS54 KSHV 290209
SVSSHV

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

LAC021-043-059-127-290217-
/O.EXP.KSHV.TO.W.0083.000000T0000Z-170529T0215Z/
Grant LA-Caldwell LA-La Salle LA-Winn LA-
909 PM CDT SUN MAY 28 2017

...THE TORNADO WARNING FOR NORTHEASTERN GRANT...SOUTHWESTERN
CALDWELL...LA SALLE AND SOUTHEASTERN WINN PARISHES WILL EXPIRE AT 915
PM CDT...
    
The tornadic thunderstorm which prompted the warning has moved to 
near olla and weakened. Therefore, the warning will be allowed to 
expire.

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

LAT...LON 3162 9272 3195 9258 3192 9201 3158 9201
TIME...MOT...LOC 0207Z 284DEG 32KT 3174 9218 

$$

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, 8:18 PM CDT	Tornado Warning	SHV	Grant, Natchitoches	44 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.