Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 212, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at May 17, 2021, 7:33 PM CDT for Baylor County, Knox County, Texas. It was in force for 42 min. 1 report 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 17, 2021, 7:33 PM CDT (00:33 UTC)
- Expired
- May 17, 2021, 8:15 PM CDT
- In force
- 42 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 2.0 in
- Wind
- 60.0 mph
Counties Baylor County, TX, Knox County, TX
The radar
The Altus AFB radar (KFDR), 102 km from the middle of the area, began a volume at 00:33 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 17, 7:41 PM CDT | HAIL 1.25 | 1 Ne Goree, TX |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 8 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
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 17, 4:44 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 0.6 hours before the alert went out and 212 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
- 392 J/kg
- Mixed-layer CIN
- -323 J/kg
- Mixed-layer LCL
- 1247 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- -5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
267
WUUS54 KOUN 180033
SVROUN
TXC023-275-180115-
/O.NEW.KOUN.SV.W.0212.210518T0033Z-210518T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
733 PM CDT Mon May 17 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Southeastern Knox County in northern Texas...
Baylor County in northern Texas...
* Until 815 PM CDT.
* At 733 PM CDT, a severe thunderstorm was located over Goree, moving
east at 30 mph.
HAZARD...Two inch hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* Locations impacted include...
Seymour, Munday, Goree, Red Springs, Mabelle, Bomarton and
southeastern Lake Kemp.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3340 9960 3351 9964 3365 9948 3376 9915
3340 9900
TIME...MOT...LOC 0033Z 254DEG 25KT 3345 9953
HAIL...2.00IN
WIND...60MPH
$$
JT2 follow-up statements
019
WWUS54 KOUN 180044
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
744 PM CDT Mon May 17 2021
TXC023-275-180115-
/O.CON.KOUN.SV.W.0212.000000T0000Z-210518T0115Z/
Knox TX-Baylor TX-
744 PM CDT Mon May 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHEASTERN KNOX AND BAYLOR COUNTIES...
At 744 PM CDT, a severe thunderstorm was located near Goree, moving
northeast at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Seymour, Goree, Red Springs, Mabelle, Bomarton and southeastern Lake
Kemp.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3340 9952 3351 9962 3365 9948 3376 9915
3340 9900
TIME...MOT...LOC 0044Z 244DEG 22KT 3349 9948
HAIL...1.75IN
WIND...60MPH
$$
JT561
WWUS54 KOUN 180052
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
752 PM CDT Mon May 17 2021
TXC023-275-180115-
/O.CON.KOUN.SV.W.0212.000000T0000Z-210518T0115Z/
Knox TX-Baylor TX-
752 PM CDT Mon May 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHEASTERN KNOX AND BAYLOR COUNTIES...
At 752 PM CDT, a severe thunderstorm was located near Bomarton,
moving east at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Seymour, Goree, Red Springs, Mabelle, Bomarton and southeastern Lake
Kemp.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.
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 3340 9949 3355 9955 3369 9936 3376 9915
3340 9900
TIME...MOT...LOC 0052Z 263DEG 20KT 3346 9942
HAIL...1.75IN
WIND...60MPH
$$
JTWhat forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 17, 6:04 PM CDT, 1 hour 29 minutes earlier.
Area forecast discussion, May 17, 6:04 PM CDT, 1 hour 29 minutes before
Area Forecast Discussion
National Weather Service Norman OK
604 PM CDT Mon May 17 2021
...New AVIATION...
.SHORT TERM...
(This evening through Tuesday)
Issued at 203 PM CDT Mon May 17 2021
Severe thunderstorms are expected to develop near a dry line in
eastern NM this afternoon and move east across the TX panhandle
toward the northern part of TX and southwestern OK by early evening.
Apart from the main severe hazard of large hail, the rest of tonight
and Tuesday will be dominated by heavy rainfall. The upper low over
western NM is forecast to move very slow to northeastern NM by
Tuesday evening. The abnormally moist air mass over the southern
plains will remain in place with a few periods of showers and rain
affecting southern and much of central Oklahoma beyond the daytime
Tuesday. The flood watch continues and we will add all of our
counties in northern Texas to the watch.
&&
.LONG TERM...
(Tuesday night through next Sunday)
Issued at 217 PM CDT Mon May 17 2021
Multiple rounds of showers and storms are likely throughout the
week and into parts of the weekend. On Wednesday morning, showers
and storms could be ongoing as the base of an mid-level closed low
moves into the Southern Plains. As this closed low moves through
the area, weak southerly flow will persist until the next mid-
level wave moves into the the West Coast this weekend. Moderate
850 mb flow atop low to mid 60s surface dewpoints should favor
continuous precipitation chances throughout the long term.
Elevated instability appears to be in place across much of the
area through the long term, so thunderstorms are possible with any
precipitating activity. Deep-layer shear is forecasted to be
weak, so any organized severe storms do not appear likely at this
time. Subsequent forecasts and changes in the models could build
confidence with the potential for organized severe storms.
The flooding potential exists across most of the area; especially
south-central, southeastern OK, and western north TX, where
multiple inches of precipitation have already fallen (and are
forecasted to fall) before the long term period begins.
Precipitable water values are supposed to stay between 1.5-1.75
inches through the remainder of the week, which is much higher
than sounding climatology for this time of year. Any additional
heavy rainfall could pose a threat of flash flooding and prolonged
periods of flooding.
Southerly surface flow should persist through the period, which
will keep high temperatures in the mid to upper 70s into the lower
80s. In addition, mostly cloudy skies should help to keep the low
temperatures in the low to mid 60s.
Bunker
&&
.AVIATION...
(00Z TAFS)
Issued at 559 PM CDT Mon May 17 2021
Storms are likely to form early this evening and continue into
the overnight hours, affecting all TAF sites. IFR and MVFR
conditions are expected to develop with the precipitation and
continue into the morning. Winds should veer from easterly to more
southerly towards the morning hours. Periods of light rain are
possible for some sites.
&&
.UPPER AIR...
Issued at 203 PM CDT Mon May 17 2021
An Upper Air flight is planned for May 18 0000Z.
&&
.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK 62 74 62 76 / 80 70 80 50
Hobart OK 60 75 60 79 / 80 60 60 40
Wichita Falls TX 64 76 63 79 / 80 70 60 50
Gage OK 57 76 56 77 / 60 60 60 40
Ponca City OK 61 76 62 77 / 60 70 90 70
Durant OK 65 76 64 76 / 70 80 90 80
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Flood Watch through Wednesday morning for OKZ019-020-022>032-
034>048-050>052.
TX...Flood Watch through Wednesday morning for TXZ083>090.
&&
SHORT TERM...09
LONG TERM....13
AVIATION...13Hazardous weather outlook, May 17, 11:59 AM CDT, 7 hours 34 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 1159 AM CDT Mon May 17 2021 OKZ004>048-050>052-TXZ083>090-181700- Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield- Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne- Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain- Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson- Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton- Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman- Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay- 1159 AM CDT Mon May 17 2021 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Thunderstorms... Severe thunderstorms will develop this afternoon in west Texas and move eastward into the area this evening. The initial threats will include very large hail up to baseball size, damaging winds to 70 mph, and possibly a few tornadoes. This is most likely during the early to mid evening hours across western north Texas and southwest Oklahoma. By late evening, storms will have consolidated into a line with the primary threat becoming damaging winds to 70 mph, although large hail will also be possible. Storms will continue moving eastward primarily impacting the southern half of Oklahoma through the night. The risk of severe storms generally north of Interstate 40 is present this evening and overnight, but comparatively lower. .Heavy Rainfall... Flooding, perhaps significant, will be possible through the night mainly across the southern half of Oklahoma. Areas that experienced significant rainfall yesterday are at an increased risk for flooding as additional heavy rain develops this evening and tonight. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... Storm spotter groups and emergency management personnel across much of Oklahoma and all of western north Texas should prepare for severe weather operations early this evening through late tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... .Thunderstorms... Thunderstorm chances will continue thru Saturday. A few severe thunderstorms will be possible Tuesday afternoon and evening mainly across portions of eastern and southeastern Oklahoma. Hail up to the size of golf balls and damaging wind gusts up to 60 mph will be possible. Strong to severe storms will again be possible across western Oklahoma and western north Texas Wednesday afternoon and evening. .Heavy Rainfall... Flooding will remain possible mainly along and south of Interstate 44 thru at least Wednesday. Significant flooding may occur across portions of southern and southeastern Oklahoma by Wednesday morning. Many locations across southern Oklahoma and north Texas could receive over 5 inches of total rainfall by the end of the week. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook.
In the hours before
Special weather statement, May 17, 6:18 PM CDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
618 PM CDT Mon May 17 2021
TXZ083>085-087-180000-
Foard TX-Knox TX-Wilbarger TX-Hardeman TX-
618 PM CDT Mon May 17 2021
...SIGNIFICANT WEATHER ADVISORY FOR southeastern Foard...north
central Knox...southwestern Wilbarger and southern Hardeman Counties
Until 700 PM CDT...
AT 615 PM CDT, a strong thunderstorm was located 8 miles southeast of
Crowell, moving northeast at 20 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This thunderstorm may become severe.
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3375 9968 3378 9979 3392 9980 3413 9957
3390 9939
TIME...MOT...LOC 2315Z 229DEG 17KT 3387 9967
JTLocal storm report, May 17, 6:55 PM CDT, 38 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
655 PM CDT MON MAY 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0653 PM HAIL 5 E KNOX CITY 33.42N 99.74W
05/17/2021 E1.00 INCH KNOX TX PUBLIC
&&
RCBLocal storm report, May 17, 7:09 PM CDT, 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
709 PM CDT MON MAY 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0655 PM HAIL KNOX CITY 33.42N 99.82W
05/17/2021 E1.00 INCH KNOX TX LAW ENFORCEMENT
&&
RCBSpecial weather statement, May 17, 7:11 PM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
711 PM CDT Mon May 17 2021
OKZ037-TXZ085-180045-
Tillman OK-Wilbarger TX-
711 PM CDT Mon May 17 2021
...SIGNIFICANT WEATHER ADVISORY FOR southwestern Tillman and central
Wilbarger Counties Until 745 PM CDT...
AT 708 PM CDT, a strong thunderstorm was located near Vernon, moving
northeast at 20 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
LAT...LON 3434 9922 3434 9919 3435 9919 3436 9920
3442 9916 3421 9895 3411 9929 3412 9934
3416 9936
TIME...MOT...LOC 0008Z 230DEG 18KT 3416 9929
JTLocal storm report, May 17, 7:28 PM CDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
728 PM CDT MON MAY 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0724 PM HAIL 2 S MUNDAY 33.42N 99.63W
05/17/2021 E1.00 INCH KNOX TX BROADCAST MEDIA
FROM NWS CHAT.
&&
RCBLocal storm report, May 17, 7:33 PM CDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
733 PM CDT MON MAY 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0732 PM HAIL 1 S MUNDAY 33.43N 99.63W
05/17/2021 E1.75 INCH KNOX TX TRAINED SPOTTER
&&
RCBThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 7:00 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Knox | 45 min |
| May 17, 7:11 PM CDT | Special Weather Statement | OUN | Wilbarger | 34 min |
| May 17, 7:22 PM CDT | Areal Flood Advisory | OUN | Knox | 3 hr |
| May 17, 8:00 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor, Wichita | 45 min |
| May 17, 8:17 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Wichita | 23 min |
| May 17, 8:19 PM CDT | Areal Flood Advisory | OUN | Baylor | 3 hr |
| May 17, 8:33 PM CDT | Areal Flood Advisory | OUN | Archer | 3 hr |
| May 17, 9:28 PM CDT | Areal Flood Advisory | OUN | Wichita | 3 hr |
| May 17, 10:42 PM CDT | Severe Thunderstorm Warning | OUN | Hardeman | 33 min |
| May 17, 11:12 PM CDT | Special Weather Statement | OUN | Hardeman | 33 min |
| May 18, 2:00 AM CDT | Special Weather Statement | OUN | Wichita | 30 min |
| May 18, 2:35 AM CDT | Special Weather Statement | OUN | Wichita | 55 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.