Alert archive / Colorado / Tornado Warnings in 2021
Tornado Warning 20, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 23, 2021, 3:11 PM MDT for Logan County, Washington County, Colorado. It was in force for 34 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 23, 2021, 3:11 PM MDT (21:11 UTC)
- Expired
- May 23, 2021, 3:45 PM MDT
- In force
- 34 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Logan County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 120 km from the middle of the area, began a volume at 21:15 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 23, 3:15 PM MDT | TORNADO | 3 S Fremont Butte, CO |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 23, 12:06 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.2 hours before the alert went out and 42 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
- 1106 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
701
WFUS55 KBOU 232111
TORBOU
COC075-121-232145-
/O.NEW.KBOU.TO.W.0020.210523T2111Z-210523T2145Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
311 PM MDT Sun May 23 2021
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
North central Washington County in northeastern Colorado...
South central Logan County in northeastern Colorado...
* Until 345 PM MDT.
* At 311 PM MDT, a severe thunderstorm capable of producing a tornado
was located 5 miles west of Akron, moving north at 40 mph.
HAZARD...Tornado and quarter 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...
Akron, Prewitt Reservoir and Midway.
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 4012 10325 4010 10336 4017 10345 4052 10333
4045 10300
TIME...MOT...LOC 2111Z 199DEG 36KT 4016 10332
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
DANIELSON1 follow-up statement
111
WWUS55 KBOU 232126
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
326 PM MDT Sun May 23 2021
COC075-121-232145-
/O.CON.KBOU.TO.W.0020.000000T0000Z-210523T2145Z/
Washington CO-Logan CO-
326 PM MDT Sun May 23 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM MDT FOR NORTH
CENTRAL WASHINGTON AND SOUTH CENTRAL LOGAN COUNTIES...
At 326 PM MDT, a severe thunderstorm capable of producing a tornado
was located 9 miles northeast of Midway, or 9 miles north of Akron,
moving north at 40 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
north central Washington and south central Logan Counties, which
includes Fremont Butte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4026 10315 4023 10330 4030 10337 4052 10332
4045 10300
TIME...MOT...LOC 2126Z 199DEG 36KT 4030 10326
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
DANIELSONThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 6:06 PM MDT | Tornado Warning | BOU | Washington | 24 min |
| May 22, 8:00 PM MDT | Special Weather Statement | BOU | Phillips | 30 min |
| May 22, 8:29 PM MDT | Special Weather Statement | BOU | Phillips, Sedgwick | 46 min |
| May 22, 9:37 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 38 min |
| May 23, 12:40 PM MDT | Tornado Warning | BOU | Elbert, Lincoln | 19 min |
| May 23, 12:41 PM MDT | Special Weather Statement | BOU | Weld | 49 min |
| May 23, 12:50 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 40 min |
| May 23, 1:24 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 36 min |
| May 23, 1:28 PM MDT | Special Weather Statement | BOU | Weld | 32 min |
| May 23, 1:47 PM MDT | Tornado Warning | BOU | Arapahoe, Elbert, Lincoln, Washington | 28 min |
| May 23, 2:13 PM MDT | Tornado Warning | BOU | Washington | 32 min |
| May 23, 2:44 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 31 min |
| May 23, 2:55 PM MDT | Tornado Warning | BOU | Washington | 20 min |
| May 23, 3:14 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert, Lincoln, Washington | 46 min |
| May 23, 3:42 PM MDT | Tornado Warning | BOU | Logan | 33 min |
| May 23, 4:06 PM MDT | Areal Flood Advisory | BOU | Washington | 3 hr |
| May 23, 4:10 PM MDT | Tornado Warning | BOU | Logan | 20 min |
| May 23, 4:27 PM MDT | Tornado Warning | BOU | Logan | 23 min |
| May 23, 4:43 PM MDT | Tornado Warning | BOU | Washington | 17 min |
| May 23, 4:58 PM MDT | Tornado Warning | BOU | Washington | 17 min |
| May 23, 5:12 PM MDT | Areal Flood Advisory | BOU | Logan, Washington | 104 min |
| May 23, 5:13 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Washington | 32 min |
| May 23, 5:31 PM MDT | Tornado Warning | BOU | Washington | 14 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.