Alert archive / Colorado / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 301, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 12, 2026, 6:06 PM MDT for Logan County, Colorado. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 12, 2026, 6:06 PM MDT (00:06 UTC)
- Expired
- Aug 12, 2026, 6:45 PM MDT
- In force
- 39 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Considerable
- Hail
- 1.5 in
- Wind
- 70.0 mph
County Logan County, CO
The radar
The Cheyenne radar (KCYS), 150 km from the middle of the area, began a volume at 00:09 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 |
|---|---|---|---|
| Aug 12, 2:32 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.1 hours before the alert went out and 216 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
- 2200 J/kg
- Mixed-layer CIN
- -113 J/kg
- Mixed-layer LCL
- 1734 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.5
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 5:51 PM MDT, 15 minutes earlier.
Area forecast discussion, Aug 12, 5:51 PM MDT, 15 minutes before
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Special weather statement, Aug 12, 3:58 PM MDT, 2 hours 8 minutes before
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</html>Special weather statement, Aug 12, 4:19 PM MDT, 1 hour 47 minutes before
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</html>Special weather statement, Aug 12, 4:28 PM MDT, 1 hour 38 minutes before
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</html>Special weather statement, Aug 12, 4:33 PM MDT, 1 hour 33 minutes before
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</html>Special weather statement, Aug 12, 5:10 PM MDT, 56 minutes before
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</html>Local storm report, Aug 12, 5:59 PM MDT, 7 minutes before
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</html>The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 6:09 PM MDT | Areal Flood Advisory | BOU | Logan | 3 hr |
| Aug 12, 6:28 PM MDT | Special Weather Statement | BOU | Phillips | 47 min |
| Aug 12, 6:39 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips | 36 min |
| Aug 12, 7:16 PM MDT | Special Weather Statement | BOU | Phillips, Sedgwick | 44 min |
| Aug 12, 7:45 PM MDT | Special Weather Statement | BOU | Logan | 30 min |
| Aug 12, 8:35 PM MDT | Special Weather Statement | BOU | Phillips | 40 min |
| Aug 12, 10:25 PM MDT | Special Weather Statement | BOU | Elbert | 50 min |
| Aug 12, 11:14 PM MDT | Areal Flood Advisory | BOU | Morgan | 3 hr |
| Aug 13, 2:18 AM MDT | Flood Watch | BOU | Adams, Arapahoe, Elbert, Lincoln, Logan, Morgan and 2 more | 22 hr |
| Aug 13, 1:49 PM MDT | Special Weather Statement | BOU | Douglas | 41 min |
| Aug 13, 2:42 PM MDT | Areal Flood Advisory | BOU | Clear Creek, Jefferson | 3 hr |
| Aug 13, 2:53 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver, Jefferson | 3 hr |
| Aug 13, 3:03 PM MDT | Areal Flood Advisory | BOU | Douglas | 105 min |
| Aug 13, 3:10 PM MDT | Special Weather Statement | BOU | Jefferson | 35 min |
| Aug 13, 3:32 PM MDT | Areal Flood Advisory | BOU | Jefferson | 3 hr |
| Aug 13, 3:35 PM MDT | Special Weather Statement | BOU | Jefferson | 25 min |
| Aug 13, 3:49 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver | 3 hr |
| Aug 13, 3:58 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Douglas | 32 min |
| Aug 13, 4:00 PM MDT | Flash Flood Warning | BOU | Douglas, Jefferson | 3 hr |
| Aug 13, 4:04 PM MDT | Special Weather Statement | BOU | Douglas | 26 min |
| Aug 13, 4:11 PM MDT | Special Weather Statement | BOU | Elbert | 34 min |
| Aug 13, 4:12 PM MDT | Special Weather Statement | BOU | Lincoln | 33 min |
| Aug 13, 4:19 PM MDT | Special Weather Statement | BOU | Elbert | 41 min |
| Aug 13, 4:21 PM MDT | Flash Flood Warning | BOU | Arapahoe, Denver | 3 hr |
| Aug 13, 4:27 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 33 min |
| Aug 13, 4:31 PM MDT | Areal Flood Advisory | BOU | Lincoln | 3 hr |
| Aug 13, 4:35 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 21 min |
| Aug 13, 4:55 PM MDT | Areal Flood Advisory | BOU | Elbert | 3 hr |
| Aug 13, 4:56 PM MDT | Special Weather Statement | BOU | Lincoln | 34 min |
| Aug 13, 5:04 PM MDT | Areal Flood Advisory | BOU | Lincoln | 4 hr |
| Aug 13, 5:14 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln, Washington | 31 min |
| Aug 13, 5:17 PM MDT | Special Weather Statement | BOU | Elbert | 43 min |
| Aug 13, 5:40 PM MDT | Special Weather Statement | BOU | Lincoln | 50 min |
| Aug 13, 5:41 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln, Washington | 34 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2026Every severe thunderstorm warning in 2026
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.