Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 8, NWS Fort Worth, TX
NWS Fort Worth, TX issued this severe thunderstorm warning at Feb 28, 2021, 9:51 AM CST for Grayson County, Texas. It was in force for 30 min. 2 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
- Feb 28, 2021, 9:51 AM CST (15:51 UTC)
- Expired
- Feb 28, 2021, 10:21 AM CST
- In force
- 30 min
- Issued by
- NWS Fort Worth, TX
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Grayson County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 151 km from the middle of the area, began a volume at 15:52 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 |
|---|---|---|---|
| Feb 28, 10:00 AM CST | HAIL 1.5 | 2 Ne Pottsboro, TX | SPOTTER MEASURED PING PONG BALL SIZE HAIL AT FM406 AND KATY LANE NORTHEAST OF POTTSBORO. |
| Feb 28, 10:03 AM CST | HAIL 1 | 2 Ese Pottsboro, TX | TRAINED SPOTTER REPORTING COPIOUS AMOUNTS OF QUARTER SIZE HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 3.9 hours before the alert went out and 125 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
- 1316 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 666 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 3.6
The text
As transmitted.
685
WUUS54 KFWD 281551
SVRFWD
TXC181-281630-
/O.NEW.KFWD.SV.W.0008.210228T1551Z-210228T1630Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Fort Worth TX
951 AM CST Sun Feb 28 2021
The National Weather Service in Fort Worth has issued a
* Severe Thunderstorm Warning for...
Northern Grayson County in north central Texas...
* Until 1030 AM CST.
* At 951 AM CST, a severe thunderstorm was located near Pottsboro, or
10 miles west of Denison, moving northeast at 55 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is possible.
* Locations impacted include...
Denison, Whitesboro, Pottsboro, Eisenhower State Park, southern
Lake Texoma and Sadler.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection get inside a sturdy structure and stay away from
windows.
&&
LAT...LON 3389 9663 3389 9658 3385 9663 3384 9662
3382 9658 3382 9653 3377 9650 3378 9644
3356 9694 3382 9694 3385 9687 3385 9684
3388 9682 3386 9678 3382 9676 3383 9672
3384 9669 3391 9668 3392 9666
TIME...MOT...LOC 1551Z 240DEG 49KT 3377 9673
HAIL...1.00IN
WIND...<50MPH
$$
Dunn2 follow-up statements
855
WWUS54 KFWD 281607
SVSFWD
Severe Weather Statement
National Weather Service Fort Worth TX
1007 AM CST Sun Feb 28 2021
TXC181-281630-
/O.CON.KFWD.SV.W.0008.000000T0000Z-210228T1630Z/
Grayson TX-
1007 AM CST Sun Feb 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 AM CST
FOR NORTHERN GRAYSON COUNTY...
At 1007 AM CST, a severe thunderstorm was located over Pottsboro, or
near Denison, moving northeast at 50 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is possible.
Locations impacted include...
Denison, Pottsboro, Eisenhower State Park and southern Lake Texoma.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection stay inside a sturdy structure and keep away from
windows.
&&
LAT...LON 3389 9663 3389 9658 3385 9663 3384 9662
3382 9658 3382 9653 3377 9650 3378 9644
3371 9670 3385 9687 3385 9684 3388 9682
3386 9678 3382 9676 3383 9672 3384 9669
3391 9668 3392 9666
TIME...MOT...LOC 1607Z 239DEG 44KT 3380 9665
HAIL...1.00IN
WIND...<50MPH
$$
Dunn967
WWUS54 KFWD 281621
SVSFWD
Severe Weather Statement
National Weather Service Fort Worth TX
1021 AM CST Sun Feb 28 2021
TXC181-281629-
/O.CAN.KFWD.SV.W.0008.000000T0000Z-210228T1630Z/
Grayson TX-
1021 AM CST Sun Feb 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN GRAYSON COUNTY IS
CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.
LAT...LON 3389 9663 3389 9658 3385 9663 3384 9662
3382 9658 3382 9653 3377 9650 3378 9644
3371 9670 3385 9687 3385 9684 3388 9682
3386 9678 3382 9676 3383 9672 3384 9669
3391 9668 3392 9666
TIME...MOT...LOC 1616Z 240DEG 49KT 3388 9648
$$
DunnThe office that day
Everything else NWS Fort Worth, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 9:11 AM CST | Special Weather Statement | FWD | Cooke | 34 min |
| Feb 28, 9:28 AM CST | Special Weather Statement | FWD | Grayson | 47 min |
| Feb 28, 11:06 AM CST | Special Weather Statement | FWD | Denton | 24 min |
| Feb 28, 11:18 AM CST | Severe Thunderstorm Warning | FWD | Collin, Cooke, Denton, Grayson | 57 min |
| Feb 28, 4:34 PM CST | Special Weather Statement | FWD | Hopkins | 26 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2021Every 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.