Alert archive / Colorado / Tornado Warnings in 2021
Tornado Warning 41, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Oct 12, 2021, 5:54 PM MDT for Phillips County, Colorado. It was in force for 36 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, 5:54 PM MDT (23:54 UTC)
- Expired
- Oct 12, 2021, 6:30 PM MDT
- In force
- 36 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.5 in
County Phillips County, CO
The radar
The Goodland radar (KGLD), 141 km from the middle of the area, began a volume at 23:57 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, 11.9 hours before the alert went out and 113 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.
467
WFUS55 KBOU 122354
TORBOU
COC095-130030-
/O.NEW.KBOU.TO.W.0041.211012T2354Z-211013T0030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
554 PM MDT Tue Oct 12 2021
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
Eastern Phillips County in northeastern Colorado...
* Until 630 PM MDT.
* At 554 PM MDT, a severe thunderstorm capable of producing a tornado
was located 9 miles south of Holyoke, moving north at 50 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Holyoke around 605 PM MDT.
Other locations in the path of this tornadic thunderstorm include
Amherst.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4044 10242 4074 10236 4075 10205 4044 10205
TIME...MOT...LOC 2354Z 195DEG 44KT 4045 10231
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
$$
MEIER2 follow-up statements
317
WWUS55 KBOU 130016
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
616 PM MDT Tue Oct 12 2021
COC095-130030-
/O.CON.KBOU.TO.W.0041.000000T0000Z-211013T0030Z/
Phillips CO-
616 PM MDT Tue Oct 12 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR EASTERN
PHILLIPS COUNTY...
At 615 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Pleasant Valley, or 8 miles east of Holyoke, moving
northeast at 35 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Amherst.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4044 10223 4074 10222 4075 10205 4044 10205
TIME...MOT...LOC 0015Z 215DEG 30KT 4055 10215
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
$$
MEIER201
WWUS55 KBOU 130027
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
627 PM MDT Tue Oct 12 2021
COC095-130036-
/O.EXP.KBOU.TO.W.0041.000000T0000Z-211013T0030Z/
Phillips CO-
627 PM MDT Tue Oct 12 2021
...THE TORNADO WARNING FOR EASTERN PHILLIPS COUNTY WILL EXPIRE AT 630
PM MDT...
The storm which prompted the warning has moved out of the area, and
no longer appears capable of producing a tornado. Therefore, the
warning will be allowed to expire.
A Tornado Watch remains in effect until 1000 PM MDT for northeastern
Colorado.
LAT...LON 4044 10223 4074 10222 4075 10205 4044 10205
TIME...MOT...LOC 0026Z 195DEG 44KT 4066 10211
$$
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, 5:18 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Sedgwick | 42 min |
Nearby
Tornado Warnings in Colorado, 2021Every tornado warning in 2021Tornadoes 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.