Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 128, NWS Shreveport, LA

May 9, 2021Nacogdoches County, San Augustine County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 9, 2021, 4:26 PM CDT for Nacogdoches County, San Augustine County, Texas. It was in force for 64 min. 3 reports 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 9, 2021, 4:26 PM CDT (21:26 UTC)
Expired: May 9, 2021, 5:30 PM CDT
In force: 64 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Nacogdoches County, TX, San Augustine County, TX

The radar

The Shreveport radar (KSHV), 112 km from the middle of the area, began a volume at 21:27 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 9, 4:27 PM CDT	HAIL 0.88	2 W Nacogdoches, TX	NICKEL SIZE HAIL REPORTED HWY 21 AND WEST LOOP 224.
May 9, 4:33 PM CDT	TSTM WND DMG	2 Ne Nacogdoches, TX	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 NE NACOGDOCHES. MULTIPLE LARGE LIMBS DOWN AND FULL TRASH CANS BLOWN OVER ON APPLEBY SAND ROAD.
May 9, 5:03 PM CDT	TSTM WND DMG	10 Ese Nacogdoches, TX	VERY LARGE TREE DOWN ON CR411 BLOCKING THE ROADWAY. SMALLER TREES REPORTED DOWN IN THE SAME AREA BUT NOT BLOCKING THE ROADS.

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 9, 1:14 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.4 hours before the alert went out and 119 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: 853 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 639 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 288 m²/s²
0-3 km storm-relative helicity: 490 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

475 
WUUS54 KSHV 092126
SVRSHV
TXC347-405-092230-
/O.NEW.KSHV.SV.W.0128.210509T2126Z-210509T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
426 PM CDT Sun May 9 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northeastern Nacogdoches County in eastern Texas...
  Northwestern San Augustine County in eastern Texas...

* Until 530 PM CDT.

* At 426 PM CDT, a severe thunderstorm was located over Nacogdoches,
  moving east southeast 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...
  Nacogdoches, Melrose, Woden, Martinsville, Appleby, Chireno and
  Denning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3151 9481 3173 9468 3168 9441 3166 9441
      3165 9439 3163 9420 3161 9412 3133 9421
TIME...MOT...LOC 2126Z 286DEG 19KT 3160 9462 

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

15

1 follow-up statement

385 
WWUS54 KSHV 092215
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
515 PM CDT Sun May 9 2021

TXC347-405-092230-
/O.CON.KSHV.SV.W.0128.000000T0000Z-210509T2230Z/
Nacogdoches TX-San Augustine TX-
515 PM CDT Sun May 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR EAST CENTRAL NACOGDOCHES AND NORTHWESTERN SAN AUGUSTINE
COUNTIES...

At 515 PM CDT, a severe thunderstorm was located near Woden, or 16 
miles southeast of Nacogdoches, moving southeast at 15 mph. Another 
strong thunderstorm was indicated over Northwest Angelina County, 
which will move northeast into Southern Nacogdoches County. 

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...
Nacogdoches, Woden, Martinsville, Melrose, Chireno and Denning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3151 9481 3166 9472 3165 9439 3163 9420
      3161 9412 3133 9421
TIME...MOT...LOC 2214Z 297DEG 15KT 3149 9442 

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

15

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 3:30 PM CDT	Special Weather Statement	SHV	Nacogdoches	45 min
May 9, 3:56 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches	64 min
May 9, 3:59 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee	42 min
May 9, 4:50 PM CDT	Flash Flood Warning	SHV	Angelina, Cherokee, Nacogdoches, San Augustine, Shelby	12 hr
May 9, 5:09 PM CDT	Special Weather Statement	SHV	Wood	66 min
May 9, 5:18 PM CDT	Special Weather Statement	SHV	Angelina	57 min
May 9, 5:28 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Sabine, San Augustine	62 min
May 9, 6:23 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Sabine, San Augustine	67 min
May 9, 6:58 PM CDT	Flash Flood Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine, Shelby	10 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2021 Every severe thunderstorm warning in 2021

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.