Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 13, NWS Shreveport, LA

January 21, 2017Cass County, Marion County, Texas; Caddo Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jan 21, 2017, 5:03 PM CST for Cass County, Marion County, Texas; Caddo Parish, Louisiana. It was in force for 57 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: Jan 21, 2017, 5:03 PM CST (23:03 UTC)
Expired: Jan 21, 2017, 6:00 PM CST
In force: 57 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Caddo Parish, LA, Cass County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 66 km from the middle of the area, began a volume at 23:02 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
Jan 21, 5:20 PM CST	HAIL 1	6 Wsw Rodessa, TX	QUARTER SIZE HAIL IN THE MCLEOD COMMUNITY.

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
Jan 21, 3:41 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.1 hours before the alert went out and 67 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: 20 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 1223 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

540 
WUUS54 KSHV 212303
SVRSHV
LAC017-TXC067-315-220000-
/O.NEW.KSHV.SV.W.0013.170121T2303Z-170122T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
503 PM CST SAT JAN 21 2017

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northwestern Caddo Parish in northwestern Louisiana...
  Southeastern Cass County in northeastern Texas...
  Northeastern Marion County in northeastern Texas...

* Until 600 PM CST

* At 502 PM CST, a severe thunderstorm was located near Smithland, or
  17 miles south of Atlanta, moving northeast at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  McLeod and Bivins. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

A tornado watch remains in effect until 900 PM CST for southwestern
Arkansas...northwestern Louisiana...and northeastern Texas.

LAT...LON 3311 9413 3304 9404 3302 9404 3302 9401
      3282 9416 3290 9425
TIME...MOT...LOC 2302Z 242DEG 17KT 3286 9414 

HAIL...1.00IN
WIND...60MPH
 
$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 2:51 PM CST	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	34 hr
Jan 21, 4:10 PM CST	Tornado Warning	SHV	Cass, Harrison, Marion	50 min
Jan 21, 4:44 PM CST	Tornado Warning	SHV	Cass, Harrison, Marion	61 min
Jan 21, 5:34 PM CST	Severe Thunderstorm Warning	SHV	Bowie	56 min
Jan 21, 5:46 PM CST	Severe Thunderstorm Warning	SHV	Cass	44 min
Jan 21, 9:44 AM CST	River Flood Warning	SHV	Caldwell, Grant, LaSalle, Winn	4 days
Jan 21, 4:21 PM CST	Special Weather Statement	SHV	Caddo	54 min
Jan 21, 4:49 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Webster	56 min
Jan 21, 4:56 PM CST	Tornado Warning	SHV	Bossier, Caddo, Webster	49 min
Jan 21, 5:30 PM CST	Tornado Warning	SHV	Bossier, Webster	60 min
Jan 21, 5:33 PM CST	Tornado Warning	SHV	Bossier, Claiborne, Webster	42 min
Jan 21, 5:37 PM CST	Tornado Warning	SHV	Grant, Natchitoches, Winn	38 min
Jan 21, 5:41 PM CST	Tornado Warning	SHV	Bossier, Caddo	49 min

Nearby

Severe Thunderstorm Warnings in Texas, 2017 Severe Thunderstorm Warnings in Louisiana, 2017 Every severe thunderstorm warning 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.