Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 157, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Oct 12, 2021, 5:18 PM MDT for Logan County, Phillips County, Sedgwick County, Colorado. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Oct 12, 2021, 5:18 PM MDT (23:18 UTC)
- Expired
- Oct 12, 2021, 6:00 PM MDT
- In force
- 42 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Logan County, CO, Phillips County, CO, Sedgwick County, CO
The radar
The Goodland radar (KGLD), 169 km from the middle of the area, began a volume at 23:20 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Oct 12, 2:46 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.3 hours before the alert went out and 99 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
- 1285 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 170 m²/s²
- 0-3 km storm-relative helicity
- 335 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
847
WUUS55 KBOU 122318
SVRBOU
COC075-095-115-130000-
/O.NEW.KBOU.SV.W.0157.211012T2318Z-211013T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
518 PM MDT Tue Oct 12 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Eastern Logan County in northeastern Colorado...
Western Phillips County in northeastern Colorado...
Western Sedgwick County in northeastern Colorado...
* Until 600 PM MDT.
* At 517 PM MDT, severe thunderstorms were located along a line
extending from 3 miles south of Iliff to 11 miles northeast of
Yuma, or along a line extending from 8 miles northeast of Sterling
to 25 miles northwest of Wray, moving north at 45 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
* Severe thunderstorms will be near...
Iliff, Padroni and Proctor around 525 PM MDT.
Other locations in the path of these severe thunderstorms include
Peetz, Highland Center, Haxtun, Paoli, Fairfield and Marks Butte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM MDT for northeastern
Colorado.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 1000 PM MDT for northeastern
Colorado.
&&
LAT...LON 4044 10237 4044 10278 4070 10316 4100 10322
4100 10238
TIME...MOT...LOC 2317Z 184DEG 41KT 4072 10308 4027 10264
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MEIER3 follow-up statements
242
WWUS55 KBOU 122335
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
535 PM MDT Tue Oct 12 2021
COC075-095-115-130000-
/O.CON.KBOU.SV.W.0157.000000T0000Z-211013T0000Z/
Logan CO-Phillips CO-Sedgwick CO-
535 PM MDT Tue Oct 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR NORTHEASTERN LOGAN...WESTERN PHILLIPS AND WESTERN SEDGWICK
COUNTIES...
At 535 PM MDT, severe thunderstorms were located along a line
extending from 6 miles south of Peetz to 7 miles south of Highland
Center, or along a line extending from 18 miles north of Sterling to
20 miles southwest of Holyoke, moving north at 45 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
Locations impacted include...
Haxtun, Paoli, Fairfield, Marks Butte and Sedgwick.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM MDT for northeastern
Colorado.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4044 10237 4044 10264 4076 10288 4100 10309
4100 10238
TIME...MOT...LOC 2335Z 184DEG 41KT 4087 10307 4042 10263
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MEIER716
WWUS55 KBOU 122348
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
548 PM MDT Tue Oct 12 2021
COC075-122357-
/O.CAN.KBOU.SV.W.0157.000000T0000Z-211013T0000Z/
Logan CO-
548 PM MDT Tue Oct 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LOGAN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM MDT for northeastern
Colorado.
LAT...LON 4044 10237 4045 10259 4073 10264 4100 10265
4100 10238
TIME...MOT...LOC 2347Z 196DEG 44KT 4107 10278 4045 10236
$$
COC095-115-130000-
/O.CON.KBOU.SV.W.0157.000000T0000Z-211013T0000Z/
Phillips CO-Sedgwick CO-
548 PM MDT Tue Oct 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR WESTERN PHILLIPS AND WESTERN SEDGWICK COUNTIES...
At 547 PM MDT, severe thunderstorms were located along a line
extending from 6 miles south of Sunol to 9 miles south of Holyoke, or
along a line extending from 11 miles southeast of Sidney to 26 miles
north of Wray, moving north at 50 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
Locations impacted include...
Haxtun, Ovid, Sedgwick, Paoli, Highland Center, Fairfield and Marks
Butte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM MDT for northeastern
Colorado.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4044 10237 4045 10259 4073 10264 4100 10265
4100 10238
TIME...MOT...LOC 2347Z 196DEG 44KT 4107 10278 4045 10236
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MEIER434
WWUS55 KBOU 130001
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
601 PM MDT Tue Oct 12 2021
COC095-115-130010-
/O.EXP.KBOU.SV.W.0157.000000T0000Z-211013T0000Z/
Phillips CO-Sedgwick CO-
601 PM MDT Tue Oct 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN PHILLIPS AND WESTERN
SEDGWICK COUNTIES HAS EXPIRED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire. However, a
Tornado Warning is effect until 630 PM MDT for eastern Phillips
county.
A Tornado Watch remains in effect until 1000 PM MDT for northeastern
Colorado.
LAT...LON 4044 10237 4045 10259 4073 10264 4100 10265
4100 10238
TIME...MOT...LOC 0000Z 184DEG 41KT 4115 10277 4053 10235
$$
MEIERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 12, 3:56 AM MDT | High Wind Watch | BOU | Boulder, Larimer | 11 hr |
| Oct 12, 3:56 AM MDT | High Wind Warning | BOU | Arapahoe, Douglas, Elbert, Lincoln | 14 hr |
| Oct 12, 2:47 PM MDT | High Wind Warning | BOU | Boulder, Larimer, Logan, Phillips, Sedgwick, Weld | 24 hr |
| Oct 12, 5:05 PM MDT | Special Weather Statement | BOU | Logan | 25 min |
| Oct 12, 5:54 PM MDT | Tornado Warning | BOU | Phillips | 36 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.