Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 190, NWS Amarillo, TX
NWS Amarillo, TX issued this severe thunderstorm warning at Jul 4, 2021, 7:31 PM CDT for Cimarron County, Oklahoma; Dallam County, Texas. It was in force for 89 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
- Jul 4, 2021, 7:31 PM CDT (00:31 UTC)
- Expired
- Jul 4, 2021, 9:00 PM CDT
- In force
- 89 min
- Issued by
- NWS Amarillo, TX
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Cimarron County, OK, Dallam County, TX
The radar
The Amarillo radar (KAMA), 173 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 |
|---|---|---|---|
| Jul 4, 8:25 PM CDT | TSTM WND GST 78 | 3 Sse Boise City, OK | MESONET STATION BOIS BOISE CITY. FIRST SEVERE GUST OCCURRED AT 830 PM CDT WITH PEAK GUST AT 835 PM CDT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 4, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 00:00Z, 0.5 hours before the alert went out and 174 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
- 2304 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1243 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 7.9
The text
As transmitted.
094
WUUS54 KAMA 050031
SVRAMA
OKC025-TXC111-050200-
/O.NEW.KAMA.SV.W.0190.210705T0031Z-210705T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
731 PM CDT Sun Jul 4 2021
The National Weather Service in Amarillo has issued a
* Severe Thunderstorm Warning for...
Cimarron County in the Panhandle of Oklahoma...
Northern Dallam County in the Panhandle of Texas...
* Until 900 PM CDT.
* At 731 PM CDT, a severe thunderstorm was located 16 miles north of
Keyes, or 19 miles west of Elkhart, moving south at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Minor damage to roofs, siding, and trees is possible.
People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles.
* Locations impacted include...
Boise City, Keyes, Kenton, Wheeless, Black Mesa Park, Felt, Griggs
and Sturgis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3699 10203 3692 10203 3650 10213 3650 10216
3638 10216 3640 10304 3650 10304 3650 10300
3700 10300
TIME...MOT...LOC 0031Z 013DEG 23KT 3705 10225
HAIL...1.75IN
WIND...60MPH
$$
LG4 follow-up statements
330
WWUS54 KAMA 050055
SVSAMA
Severe Weather Statement
National Weather Service Amarillo TX
755 PM CDT Sun Jul 4 2021
OKC025-TXC111-050200-
/O.CON.KAMA.SV.W.0190.000000T0000Z-210705T0200Z/
Cimarron OK-Dallam TX-
755 PM CDT Sun Jul 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR CIMARRON AND NORTHERN DALLAM COUNTIES...
At 755 PM CDT, a severe thunderstorm was located 10 miles northwest
of Keyes, or 16 miles northeast of Boise City, moving south at 25
mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Minor damage to roofs, siding, and trees is possible.
People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles.
Locations impacted include...
Boise City, Keyes, Kenton, Wheeless, Black Mesa Park, Felt, Griggs
and Sturgis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3699 10203 3692 10203 3650 10213 3650 10216
3638 10216 3640 10304 3650 10304 3650 10300
3700 10300
TIME...MOT...LOC 0055Z 020DEG 20KT 3693 10236
HAIL...1.75IN
WIND...60MPH
$$
LG615
WWUS54 KAMA 050112
SVSAMA
Severe Weather Statement
National Weather Service Amarillo TX
812 PM CDT Sun Jul 4 2021
OKC025-TXC111-050200-
/O.CON.KAMA.SV.W.0190.000000T0000Z-210705T0200Z/
Cimarron OK-Dallam TX-
812 PM CDT Sun Jul 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR CIMARRON AND NORTHERN DALLAM COUNTIES...
At 812 PM CDT, a severe thunderstorm was located 8 miles northeast of
Boise City, moving south at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Minor damage to roofs, siding, and trees is possible.
People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles.
Locations impacted include...
Boise City, Keyes, Kenton, Wheeless, Black Mesa Park, Felt, Griggs
and Sturgis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3699 10203 3692 10203 3650 10213 3650 10216
3638 10216 3640 10304 3650 10304 3650 10300
3700 10300
TIME...MOT...LOC 0112Z 015DEG 23KT 3682 10241
HAIL...1.75IN
WIND...60MPH
$$
LG392
WWUS54 KAMA 050133
SVSAMA
Severe Weather Statement
National Weather Service Amarillo TX
833 PM CDT Sun Jul 4 2021
OKC025-TXC111-050200-
/O.CON.KAMA.SV.W.0190.000000T0000Z-210705T0200Z/
Cimarron OK-Dallam TX-
833 PM CDT Sun Jul 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR CIMARRON AND NORTHERN DALLAM COUNTIES...
At 833 PM CDT, a severe thunderstorm was located 8 miles south of
Boise City, moving south at 35 mph.
HAZARD...70 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect some tree damage. Damage is likely to mobile homes,
roofs, and outbuildings. Hail damage to vehicles is
expected.
Locations impacted include...
Boise City, Keyes, Kenton, Wheeless, Black Mesa Park, Felt, Griggs
and Sturgis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3699 10203 3692 10203 3650 10213 3650 10216
3638 10216 3640 10304 3650 10304 3650 10300
3700 10300
TIME...MOT...LOC 0133Z 006DEG 31KT 3662 10245
HAIL...1.25IN
WIND...70MPH
$$
LG068
WWUS54 KAMA 050139
SVSAMA
Severe Weather Statement
National Weather Service Amarillo TX
839 PM CDT Sun Jul 4 2021
OKC025-TXC111-050200-
/O.CON.KAMA.SV.W.0190.000000T0000Z-210705T0200Z/
Cimarron OK-Dallam TX-
839 PM CDT Sun Jul 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR CIMARRON AND NORTHERN DALLAM COUNTIES...
At 839 PM CDT, a severe thunderstorm was located 9 miles south of
Boise City, moving south at 35 mph.
This is a very dangerous storm.
HAZARD...80 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be heavily damaged. Expect
considerable damage to roofs, windows, and vehicles. Tree
damage and power outages are likely. Hail damage to
vehicles is expected.
Locations impacted include...
Boise City, Keyes, Kenton, Wheeless, Black Mesa Park, Felt, Griggs
and Sturgis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3699 10203 3692 10203 3650 10213 3650 10216
3638 10216 3640 10304 3650 10304 3650 10300
3700 10300
TIME...MOT...LOC 0139Z 014DEG 29KT 3659 10250
HAIL...1.00IN
WIND...80MPH
$$
LGThe office that day
Everything else NWS Amarillo, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 7:42 PM CDT | Severe Thunderstorm Warning | AMA | Cimarron, Texas | 93 min |
| Jul 4, 9:00 PM CDT | Severe Thunderstorm Warning | AMA | Cimarron | 50 min |
| Jul 4, 7:06 PM CDT | Severe Thunderstorm Warning | AMA | Hartley, Oldham | 84 min |
| Jul 4, 7:43 PM CDT | Areal Flood Advisory | AMA | Deaf Smith, Oldham | 90 min |
| Jul 4, 7:52 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Oldham | 83 min |
| Jul 4, 9:00 PM CDT | Severe Thunderstorm Warning | AMA | Hartley, Moore, Sherman | 60 min |
| Jul 4, 9:52 PM CDT | Areal Flood Advisory | AMA | Dallam, Hartley | 53 min |
| Jul 4, 10:28 PM CDT | Special Weather Statement | AMA | Oldham | 62 min |
| Jul 4, 10:40 PM CDT | Severe Thunderstorm Warning | AMA | Hartley, Oldham | 65 min |
| Jul 4, 11:05 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Oldham, Potter, Randall | 55 min |
| Jul 4, 11:28 PM CDT | Special Weather Statement | AMA | Deaf Smith | 47 min |
| Jul 4, 11:36 PM CDT | Special Weather Statement | AMA | Gray | 24 min |
| Jul 4, 11:39 PM CDT | Special Weather Statement | AMA | Randall | 36 min |
| Jul 5, 12:01 AM CDT | Severe Thunderstorm Warning | AMA | Armstrong, Carson, Donley, Gray | 59 min |
| Jul 5, 12:35 AM CDT | Special Weather Statement | AMA | Gray | 25 min |
| Jul 5, 12:59 AM CDT | Severe Thunderstorm Warning | AMA | Armstrong, Carson | 61 min |
| Jul 5, 1:31 AM CDT | Severe Thunderstorm Warning | AMA | Armstrong, Carson, Potter, Randall | 74 min |
| Jul 5, 2:34 AM CDT | Flash Flood Warning | AMA | Randall | 112 min |
| Jul 5, 2:43 AM CDT | Special Weather Statement | AMA | Randall | 47 min |
| Jul 5, 2:57 AM CDT | Areal Flood Advisory | AMA | Donley | 3 hr |
| Jul 5, 6:38 AM CDT | Areal Flood Advisory | AMA | Collingsworth, Wheeler | 3 hr |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2021Severe 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.