Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 112, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 17, 2021, 7:11 PM MDT for Adams County, Morgan County, Colorado. It was in force for 34 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
- Jul 17, 2021, 7:11 PM MDT (01:11 UTC)
- Expired
- Jul 17, 2021, 7:45 PM MDT
- In force
- 34 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Adams County, CO, Morgan County, CO
The radar
The Denver radar (KFTG), 58 km from the middle of the area, began a volume at 01:13 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 nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 1.2 hours before the alert went out and 61 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
- 55 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 3294 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
221
WUUS55 KBOU 180111
SVRBOU
COC001-087-180145-
/O.NEW.KBOU.SV.W.0112.210718T0111Z-210718T0145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
711 PM MDT Sat Jul 17 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
South central Morgan County in northeastern Colorado...
Northeastern Adams County in northeastern Colorado...
* Until 745 PM MDT.
* At 711 PM MDT, a severe thunderstorm was located 4 miles west of
Adena, or 20 miles southwest of Fort Morgan, and is nearly
stationary.
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...
Adena.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4008 10384 3990 10381 3989 10405 4006 10407
TIME...MOT...LOC 0111Z 099DEG 0KT 4000 10397
HAIL...1.00IN
WIND...60MPH
$$
HIRIS1 follow-up statement
590
WWUS55 KBOU 180140
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
740 PM MDT Sat Jul 17 2021
COC001-087-180149-
/O.EXP.KBOU.SV.W.0112.000000T0000Z-210718T0145Z/
Morgan CO-Adams CO-
740 PM MDT Sat Jul 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MORGAN AND
NORTHEASTERN ADAMS COUNTIES WILL EXPIRE AT 745 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 4008 10384 3990 10381 3989 10405 4006 10407
TIME...MOT...LOC 0139Z 099DEG 0KT 4000 10397
$$
HIRISThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 6:01 PM MDT | Special Weather Statement | BOU | Denver | 29 min |
| Jul 17, 6:42 PM MDT | Special Weather Statement | BOU | Arapahoe | 33 min |
| Jul 17, 6:53 PM MDT | Special Weather Statement | BOU | Morgan | 22 min |
| Jul 17, 7:06 PM MDT | Special Weather Statement | BOU | Adams | 24 min |
| Jul 17, 7:37 PM MDT | Areal Flood Advisory | BOU | Adams, Morgan | 113 min |
| Jul 17, 7:44 PM MDT | Special Weather Statement | BOU | Morgan | 46 min |
| Jul 17, 8:10 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Washington | 50 min |
| Jul 17, 8:55 PM MDT | Special Weather Statement | BOU | Logan | 50 min |
| Jul 17, 9:13 PM MDT | Special Weather Statement | BOU | Crowley | 47 min |
| Jul 17, 10:18 PM MDT | Special Weather Statement | BOU | Lincoln | 42 min |
| Jul 17, 10:38 PM MDT | Areal Flood Advisory | BOU | Elbert, Lincoln | 82 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.