Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 234, NWS Shreveport, LA

July 9, 2017Cherokee County, Smith County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Jul 9, 2017, 2:02 PM CDT for Cherokee County, Smith County, Texas. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 9, 2017, 2:02 PM CDT (19:02 UTC)
Expired: Jul 9, 2017, 3:00 PM CDT
In force: 58 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cherokee County, TX, Smith County, TX

The radar

The Shreveport radar (KSHV), 135 km from the middle of the area, began a volume at 19:03 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 nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 7.0 hours before the alert went out and 144 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: 410 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: -22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 9, 1:11 PM CDT, 51 minutes earlier.

Area forecast discussion, Jul 9, 1:11 PM CDT, 51 minutes before

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Hazardous weather outlook, Jul 9, 11:42 AM CDT, 2 hours 20 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
1142 AM CDT Sun Jul 9 2017

ARZ050-051-059>061-070>072-LAZ001>004-010>012-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-101645-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-Caddo-Bossier-Webster-Claiborne-De Soto-Red River-
Bienville-Sabine-Natchitoches-Winn-Grant-Caldwell-La Salle-
McCurtain-Bowie-Franklin-Titus-Camp-Morris-Cass-Wood-Upshur-
Marion-Smith-Gregg-Harrison-Cherokee-Rusk-Panola-Nacogdoches-
Shelby-Angelina-San Augustine-
1142 AM CDT Sun Jul 9 2017

This Hazardous Weather Outlook is for portions of southwest
Arkansas, north central Louisiana, northwest Louisiana, southeast
Oklahoma, east Texas and northeast Texas.

.DAY ONE...This Afternoon and Tonight...

Scattered showers and thunderstorms will be possible today across
southeast Oklahoma, extreme southwest Arkansas, east Texas, and
northwest Louisiana. Isolated strong to severe thunderstorms may
be possible this afternoon over East Texas, with damaging winds,
small hail, and brief heavy rainfall possible. These storms will
diminish this evening with the loss of heating and instability.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

Scattered showers and thunderstorms will be possible Monday
through Saturday, occurring mainly during the afternoon and early
evening. Brief heavy rainfall and locally gusty winds will be
possible in the stronger storms. In addition, afternoon
temperatures will climb into the lower to mid 90s each day. When
combined with the humidity, afternoon heat indices will range from
100 to 105 degrees.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency managers, storm spotters, and amateur
radio operators, may be needed this afternoon mainly over East
Texas.

ARZ073-LAZ005-006-013-014-101645-
Union-Lincoln-Jackson-Ouachita-
1142 AM CDT Sun Jul 9 2017

This Hazardous Weather Outlook is for portions of south central
Arkansas and north central Louisiana.

.DAY ONE...This Afternoon and Tonight...

No hazardous weather is expected.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

Isolated mainly afternoon and early evening showers and
thunderstorms will be possible Tuesday through Saturday. In
addition, afternoon temperatures will climb into the lower to mid
90s each day. When combined with the humidity, afternoon heat
indices will range from 100 to 105 degrees.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

05

In the hours before

Special weather statement, Jul 9, 1:50 PM CDT, 12 minutes before

Special Weather Statement
National Weather Service Shreveport LA
150 PM CDT SUN JUL 9 2017

LAZ020-091930-
Grant LA-
150 PM CDT SUN JUL 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR GRANT PARISH UNTIL 230 PM CDT...

At 150 PM CDT, Doppler radar was tracking a strong thunderstorm 11
miles northeast of Colfax, or 16 miles northeast of Boyce, moving
west at 10 mph.

Dime size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Colfax, Pollock, Dry Prong, Lake Iatt, Williana and Bentley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3141 9267 3140 9269 3141 9270 3142 9268
      3143 9269 3145 9268 3145 9271 3147 9271
      3147 9269 3153 9272 3155 9276 3156 9275
      3157 9277 3170 9281 3170 9247 3145 9234
      3139 9263 3139 9266
TIME...MOT...LOC 1850Z 074DEG 10KT 3160 9253

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:37 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Panola, Rusk, Smith	38 min
Jul 9, 3:07 PM CDT	Areal Flood Advisory	SHV	Cherokee, Gregg, Nacogdoches, Panola, Rusk, Smith	3 hr
Jul 9, 3:10 PM CDT	Special Weather Statement	SHV	Cherokee	50 min
Jul 9, 3:43 PM CDT	Special Weather Statement	SHV	Gregg	47 min
Jul 9, 4:32 PM CDT	Severe Thunderstorm Warning	SHV	Upshur, Wood	58 min
Jul 9, 5:07 PM CDT	Special Weather Statement	SHV	Angelina	53 min
Jul 9, 5:15 PM CDT	Special Weather Statement	SHV	Camp	45 min
Jul 9, 5:56 PM CDT	Special Weather Statement	SHV	Sabine, San Augustine	49 min
Jul 9, 6:12 PM CDT	Special Weather Statement	SHV	Cass, Marion	48 min
Jul 9, 6:23 PM CDT	Special Weather Statement	SHV	Cass	37 min
Jul 9, 6:54 PM CDT	Special Weather Statement	SHV	San Augustine	51 min
Jul 8, 9:40 PM CDT	Special Weather Statement	SHV	Webster	50 min
Jul 9, 1:50 PM CDT	Special Weather Statement	SHV	Grant	40 min
Jul 9, 2:30 PM CDT	Special Weather Statement	SHV	Bienville, Red River	45 min
Jul 9, 2:32 PM CDT	Special Weather Statement	SHV	Grant	43 min
Jul 9, 3:02 PM CDT	Special Weather Statement	SHV	Red River	43 min
Jul 9, 3:56 PM CDT	Special Weather Statement	SHV	Natchitoches	49 min
Jul 9, 4:24 PM CDT	Areal Flood Advisory	SHV	Natchitoches, Winn	2 hr
Jul 9, 4:58 PM CDT	Special Weather Statement	SHV	Caddo	47 min

Nearby

Severe Thunderstorm Warnings in Texas, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.