Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 218
The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2021, 12:14 PM CDT for 28 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 28, 2021, 12:14 PM CDT (17:14 UTC)
- Expired
- May 28, 2021, 7:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 28 counties
Bell County, TX, Bosque County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Comanche County, TX, Coryell County, TX, Eastland County, TX, Erath County, TX, Falls County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Mills County, TX, Palo Pinto County, TX, Robertson County, TX, Somervell County, TX, Stephens County, TX, Washington County, TX, Williamson County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 101 km from the middle of the area, began a volume at 17:15 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
- 40%
- 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
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 12:47 PM CDT | Severe Thunderstorm Warning | FWD | Hamilton, Mills | 58 min |
| May 28, 1:21 PM CDT | Severe Thunderstorm Warning | FWD | McLennan | 54 min |
| May 28, 1:26 PM CDT | Severe Thunderstorm Warning | FWD | Coryell, Lampasas | 79 min |
| May 28, 1:43 PM CDT | Severe Thunderstorm Warning | FWD | Hamilton | 32 min |
| May 28, 2:44 PM CDT | Severe Thunderstorm Warning | FWD | Bell, Coryell, Falls, McLennan | 61 min |
| May 28, 2:51 PM CDT | Flash Flood Warning | FWD | McLennan | 3 hr |
| May 28, 4:38 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 52 min |
| May 28, 5:15 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 60 min |
| May 28, 5:28 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 62 min |
| May 28, 5:50 PM CDT | Severe Thunderstorm Warning | EWX | Llano | 40 min |
| May 28, 6:12 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Burnet, Travis, Williamson | 63 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
Fort Worth, TX (KFWD), launched 12:00Z, 5.2 hours before the alert went out and 128 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
- 313 J/kg
- Mixed-layer CIN
- -386 J/kg
- Mixed-layer LCL
- 694 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.0
The text
As transmitted.
138
WWUS20 KWNS 281709
SEL8
SPC WW 281709
TXZ000-290000-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 218
NWS Storm Prediction Center Norman OK
1210 PM CDT Fri May 28 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central Texas
* Effective this Friday afternoon and evening from 1210 PM until
700 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...A cluster of thunderstorms has developed over central
Texas. These storms are expected to persist through the afternoon
and build southeastward across the watch area. Large hail and
damaging wind gusts will be possible with the more intense cells.
The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 20 miles north of
Brownwood TX to 30 miles east northeast of College Station TX. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).
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 500. Mean storm motion vector
29025.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 10:24 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Haskell, Jack, Knox and 7 more | 96 min |
| May 28, 2:33 AM CDT | Mesoscale Discussion | SPC | Collin, Denton, Hunt, Rockwall, Wise | 117 min |
| May 28, 5:10 AM CDT | Mesoscale Discussion | SPC | Briscoe, Castro, Childress, Cottle, Floyd, Foard and 7 more | 2 hr |
| May 28, 11:16 AM CDT | Mesoscale Discussion | SPC | Bell, Bosque, Brazos, Brown, Burleson, Coleman and 19 more | 89 min |
| May 28, 12:49 PM CDT | Mesoscale Discussion | SPC | Brewster, Pecos, Presidio, Terrell | 86 min |
| May 28, 1:03 PM CDT | Mesoscale Discussion | SPC | Andrews, Bailey, Borden, Cochran, Dawson, Ector and 11 more | 57 min |
| May 28, 2:33 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Brown, Coke, Coleman, Concho and 35 more | 117 min |
| May 28, 2:45 PM CDT | Severe Thunderstorm Watch | SPC | Brewster, Culberson, Jeff Davis, Loving, Pecos, Reeves and 3 more | 9 hr |
| May 28, 3:41 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Brown, Coke, Coleman, Concho, Crane and 20 more | 8 hr |
| May 28, 3:42 PM CDT | Mesoscale Discussion | SPC | Bell, Brazos, Brown, Burleson, Burnet, Comanche and 12 more | 93 min |
| May 28, 5:54 PM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Blanco and 29 more | 96 min |
| May 28, 6:20 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Blanco and 32 more | 5 hr |
| May 28, 6:49 PM CDT | Mesoscale Discussion | SPC | Bailey, Deaf Smith, Parmer | 86 min |
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.