Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 95
The Storm Prediction Center issued this severe thunderstorm watch at Apr 14, 2021, 1:40 PM CDT for 16 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2021, 1:40 PM CDT (18:40 UTC)
- Expired
- Apr 14, 2021, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Aransas County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Jackson County, TX, Jefferson County, TX, Matagorda County, TX, Orange County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 95 km from the middle of the area, began a volume at 18:42 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 7:52 PM CDT | Severe Thunderstorm Warning | LCH | Jefferson | 38 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 12:00Z, 6.7 hours before the alert went out and 201 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.
- Mixed-layer CAPE
- 2595 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 477 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 6.0
The text
As transmitted.
044
WWUS20 KWNS 141837
SEL5
SPC WW 141837
LAZ000-TXZ000-CWZ000-150100-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 95
NWS Storm Prediction Center Norman OK
135 PM CDT Wed Apr 14 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Extreme southwest Louisiana
The Middle and Upper Texas Coastal Plains
Coastal Waters
* Effective this Wednesday afternoon and evening from 135 PM
until 800 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Widely scattered thunderstorm development is expected by
mid afternoon from the Middle Texas Coastal Plain northeastward to
extreme southwest Louisiana. The storm environment will favor a mix
of multicell clusters and some supercell structures, with an
attendant threat for large hail and isolated damaging gusts into
this evening.
The severe thunderstorm watch area is approximately along and 30
statute miles either side of a line from 55 miles southwest of
Victoria TX to 40 miles east of Port Arthur TX. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
27015.
...ThompsonSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 5:17 AM CDT | Mesoscale Discussion | SPC | Angelina, Hardin, Jasper, Liberty, Montgomery, Nacogdoches and 9 more | 2 hr |
| Apr 14, 12:43 PM CDT | Mesoscale Discussion | SPC | Bee, Colorado, DeWitt, Fort Bend, Goliad, Gonzales and 8 more | 2 hr |
| Apr 14, 4:49 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Clay, Eastland, Jack and 8 more | 116 min |
| Apr 14, 5:27 PM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brazoria, Calhoun, Chambers, DeWitt and 12 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2021Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.