Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 50, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 26, 2021, 4:18 PM MDT for Logan County, Weld 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
- May 26, 2021, 4:18 PM MDT (22:18 UTC)
- Expired
- May 26, 2021, 5:00 PM MDT
- In force
- 42 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Logan County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 131 km from the middle of the area, began a volume at 22:21 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 |
|---|---|---|---|
| May 26, 3:42 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.3 hours before the alert went out and 106 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
- 138 J/kg
- Mixed-layer CIN
- -221 J/kg
- Mixed-layer LCL
- 1456 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
404
WUUS55 KBOU 262218
SVRBOU
COC075-123-262300-
/O.NEW.KBOU.SV.W.0050.210526T2218Z-210526T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
418 PM MDT Wed May 26 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Northeastern Weld County in northeastern Colorado...
Northwestern Logan County in northeastern Colorado...
* Until 500 PM MDT.
* At 417 PM MDT, severe thunderstorms were located along a line
extending from near North Sterling Reservoir to 5 miles northeast
of Stoneham, or along a line extending from 10 miles north of
Sterling to 30 miles north of Fort Morgan, moving north at 15 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. People and
animals outdoors will be injured. Expect hail damage to
roofs, siding, windows, and vehicles.
* Locations impacted include...
Sterling, Iliff, Peetz, Stoneham, Padroni, Westplains, Logan
Corners, North Sterling Reservoir and Pawnee Pass.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 100 AM MDT for northeastern
Colorado.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4098 10298 4095 10386 4057 10377 4061 10294
TIME...MOT...LOC 2217Z 181DEG 14KT 4078 10324 4067 10360
HAIL...1.75IN
WIND...60MPH
$$
MEIER2 follow-up statements
384
WWUS55 KBOU 262237
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
437 PM MDT Wed May 26 2021
COC123-262245-
/O.CAN.KBOU.SV.W.0050.000000T0000Z-210526T2300Z/
Weld CO-
437 PM MDT Wed May 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WELD COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has weakened in
Weld county. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 100 AM MDT for northeastern
Colorado.
LAT...LON 4098 10298 4061 10294 4058 10358 4096 10357
TIME...MOT...LOC 2235Z 220DEG 37KT 4091 10317
$$
COC075-262300-
/O.CON.KBOU.SV.W.0050.000000T0000Z-210526T2300Z/
Logan CO-
437 PM MDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM MDT
FOR NORTHWESTERN LOGAN COUNTY...
At 435 PM MDT, a severe thunderstorm was located 4 miles southwest of
Peetz, or 18 miles southwest of Sidney, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
Locations impacted include...
Sterling, Iliff, Peetz, Padroni, Westplains, Logan Corners, North
Sterling Reservoir and Pawnee Pass.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 100 AM MDT for northeastern
Colorado.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4098 10298 4061 10294 4058 10358 4096 10357
TIME...MOT...LOC 2235Z 220DEG 37KT 4091 10317
HAIL...1.00IN
WIND...60MPH
$$
MEIER112
WWUS55 KBOU 262301
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
501 PM MDT Wed May 26 2021
COC075-262311-
/O.EXP.KBOU.SV.W.0050.000000T0000Z-210526T2300Z/
Logan CO-
501 PM MDT Wed May 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LOGAN COUNTY HAS
EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
A Tornado Watch remains in effect until 100 AM MDT for northeastern
Colorado.
LAT...LON 4098 10298 4061 10294 4058 10358 4096 10357
TIME...MOT...LOC 2301Z 181DEG 14KT 4101 10317
$$
MEIERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 3:42 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 48 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.