Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 81, NWS Shreveport, LA

May 28, 2017Winn Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at May 28, 2017, 8:05 PM CDT for Winn Parish, Louisiana. It was in force for 40 min. 1 report 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: May 28, 2017, 8:05 PM CDT (01:05 UTC)
Expired: May 28, 2017, 8:45 PM CDT
In force: 40 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 99 km from the middle of the area, began a volume at 01:06 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
May 28, 8:07 PM CDT	TORNADO	5 Sse Calvin, LA	A BRIEF EF1 TORNADO MOVED FROM NW TO SE ACROSS US HWY 84 WEST OF WINNFIELD. NUMEROUS TREES WERE SNAPPED AND UPROOTED.

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
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, 1.1 hours before the alert went out and 213 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.

263 
WFUS54 KSHV 290105
TORSHV
LAC127-290145-
/O.NEW.KSHV.TO.W.0081.170529T0105Z-170529T0145Z/

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

The National Weather Service in Shreveport has issued a

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

* Until 845 PM CDT
    
* At 804 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Winnfield, moving east at 65 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. 

* Locations impacted include...
  Winnfield, Dodson, Calvin, 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!

&&

LAT...LON 3189 9233 3186 9232 3185 9234 3185 9233
      3183 9234 3190 9282 3206 9282 3212 9231
      3190 9231
TIME...MOT...LOC 0104Z 276DEG 55KT 3195 9272 

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

$$

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, 8:18 PM CDT	Tornado Warning	SHV	Grant, Natchitoches	44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.