Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 48
The Storm Prediction Center issued this severe thunderstorm watch at Mar 24, 2021, 4:59 PM CDT for 24 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2021, 4:59 PM CDT (21:59 UTC)
- Expired
- Mar 24, 2021, 10:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 24 counties
Camp County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Morris County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Wise County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 100 km from the middle of the area, began a volume at 21:58 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- 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
- 40%
- 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 |
|---|---|---|---|---|
| Mar 24, 5:39 PM CDT | Severe Thunderstorm Warning | FWD | Dallas, Hunt, Kaufman, Rockwall | 66 min |
| Mar 24, 6:49 PM CDT | Severe Thunderstorm Warning | SHV | Franklin, Wood | 41 min |
| Mar 24, 6:50 PM CDT | Severe Thunderstorm Warning | FWD | Rains | 24 min |
| Mar 24, 6:58 PM CDT | Severe Thunderstorm Warning | SHV | Wood | 47 min |
| Mar 24, 7:25 PM CDT | Severe Thunderstorm Warning | FWD | Hopkins | 40 min |
| Mar 24, 7:26 PM CDT | Severe Thunderstorm Warning | SHV | Franklin, Red River, Titus | 49 min |
| Mar 24, 8:40 PM CDT | Severe Thunderstorm Warning | FWD | Denton, Parker, Tarrant, Wise | 65 min |
| Mar 24, 8:48 PM CDT | Severe Thunderstorm Warning | FWD | Jack, Wise | 42 min |
| Mar 24, 9:12 PM CDT | Severe Thunderstorm Warning | FWD | Cooke, Montague | 51 min |
| Mar 24, 9:29 PM CDT | Severe Thunderstorm Warning | FWD | Denton | 61 min |
| Mar 24, 9:37 PM CDT | Tornado Warning | FWD | Denton | 32 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, 10.0 hours before the alert went out and 81 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1705 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 362 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
827
WWUS20 KWNS 242155
SEL8
SPC WW 242155
TXZ000-250300-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 48
NWS Storm Prediction Center Norman OK
500 PM CDT Wed Mar 24 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
North and northeast Texas
* Effective this Wednesday afternoon and evening from 500 PM
until 1000 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
A tornado or two possible
SUMMARY...Multiple supercells are expected to develop
north-northeast from north-central Texas this evening. Large hail is
expected to be the primary hazard.
The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 30 miles northwest of
Fort Worth TX to 50 miles southeast of Paris 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 47...
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
22040.
...GramsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 3:22 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Bosque, Brown, Burnet, Comanche and 32 more | 2 hr |
| Mar 24, 4:38 PM CDT | Tornado Watch | SPC | Bell, Bosque, Brown, Burnet, Comanche, Coryell and 21 more | 5 hr |
| Mar 24, 6:10 PM CDT | Mesoscale Discussion | SPC | Bell, Bosque, Brown, Burnet, Comanche, Concho and 31 more | 65 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.