Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 36, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 22, 2021, 1:58 PM MDT for Logan County, Morgan County, Washington County, Colorado. It was in force for 33 min. 3 reports 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 22, 2021, 1:58 PM MDT (19:58 UTC)
- Expired
- May 22, 2021, 2:31 PM MDT
- In force
- 33 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Logan County, CO, Morgan County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 119 km from the middle of the area, began a volume at 19:59 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 22, 1:58 PM MDT | HAIL 1.5 | 5 Wnw Midway, CO | M149, CHASING. |
| May 22, 2:03 PM MDT | TORNADO | 1 Sw Midway, CO | BRIEF, WEAK TORNADO. HAS DISSIPATED. |
| May 22, 2:12 PM MDT | HAIL 1 | 4 Wnw Akron, 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 22, 12:20 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 8.0 hours before the alert went out and 48 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
- 1528 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
667
WUUS55 KBOU 221958
SVRBOU
COC075-087-121-222045-
/O.NEW.KBOU.SV.W.0036.210522T1958Z-210522T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
158 PM MDT Sat May 22 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Northeastern Morgan County in northeastern Colorado...
Northeastern Washington County in northeastern Colorado...
Southwestern Logan County in northeastern Colorado...
* Until 245 PM MDT.
* At 158 PM MDT, a severe thunderstorm was located near Midway, or 14
miles northwest of Akron, 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, Akron, Brush, Otis, Merino, Hillrose, Prewitt Reservoir,
Atwood, Platner, Willard, Burdett, Logan Corners, Snyder, Midway
and Pawnee Pass.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM MDT for northeastern
Colorado.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4007 10343 4028 10367 4068 10350 4062 10292
4006 10292
TIME...MOT...LOC 1958Z 206DEG 33KT 4026 10345
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
DANIELSON2 follow-up statements
666
WWUS55 KBOU 222023
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
223 PM MDT Sat May 22 2021
COC087-222032-
/O.CAN.KBOU.SV.W.0036.000000T0000Z-210522T2045Z/
Morgan CO-
223 PM MDT Sat May 22 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MORGAN COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM MDT for northeastern
Colorado.
LAT...LON 4032 10338 4044 10344 4067 10340 4062 10292
4026 10292 4019 10323
TIME...MOT...LOC 2022Z 206DEG 33KT 4046 10332
$$
COC075-121-222045-
/O.CON.KBOU.SV.W.0036.000000T0000Z-210522T2045Z/
Washington CO-Logan CO-
223 PM MDT Sat May 22 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR NORTHEASTERN WASHINGTON AND SOUTHWESTERN LOGAN COUNTIES...
At 222 PM MDT, a severe thunderstorm was located near Merino, or 12
miles southwest of Sterling, 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, Merino, Logan Corners, Prewitt Reservoir, Atwood and
Burdett.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM MDT for northeastern
Colorado.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4032 10338 4044 10344 4067 10340 4062 10292
4026 10292 4019 10323
TIME...MOT...LOC 2022Z 206DEG 33KT 4046 10332
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
DANIELSON160
WWUS55 KBOU 222031
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
231 PM MDT Sat May 22 2021
COC075-121-222041-
/O.CAN.KBOU.SV.W.0036.000000T0000Z-210522T2045Z/
Washington CO-Logan CO-
231 PM MDT Sat May 22 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON AND
SOUTHWESTERN LOGAN COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM MDT for northeastern
Colorado.
LAT...LON 4032 10338 4044 10344 4067 10340 4062 10292
4026 10292 4019 10323
TIME...MOT...LOC 2028Z 206DEG 33KT 4054 10327
$$
DANIELSONThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:18 PM MDT | Special Weather Statement | BOU | Morgan | 27 min |
| May 21, 10:57 PM MDT | Special Weather Statement | BOU | Phillips, Sedgwick | 48 min |
| May 22, 1:11 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Logan, Morgan, Washington | 49 min |
| May 22, 1:28 PM MDT | Tornado Warning | BOU | Morgan | 17 min |
| May 22, 1:45 PM MDT | Tornado Warning | BOU | Morgan | 15 min |
| May 22, 1:54 PM MDT | Tornado Warning | BOU | Morgan, Washington | 36 min |
| May 22, 1:56 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 28 min |
| May 22, 2:05 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 25 min |
| May 22, 2:18 PM MDT | Special Weather Statement | BOU | Adams | 42 min |
| May 22, 2:43 PM MDT | Tornado Warning | BOU | Logan | 17 min |
| May 22, 2:46 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 44 min |
| May 22, 2:57 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Sedgwick | 48 min |
| May 22, 3:01 PM MDT | Tornado Warning | BOU | Logan | 29 min |
| May 22, 3:16 PM MDT | Tornado Warning | BOU | Lincoln | 29 min |
| May 22, 3:25 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 35 min |
| May 22, 3:48 PM MDT | Tornado Warning | BOU | Elbert, Lincoln | 27 min |
| May 22, 3:53 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 26 min |
| May 22, 4:13 PM MDT | Tornado Warning | BOU | Elbert, Lincoln | 32 min |
| May 22, 4:42 PM MDT | Tornado Warning | BOU | Elbert, Lincoln | 33 min |
| May 22, 5:16 PM MDT | Tornado Warning | BOU | Elbert, Lincoln | 29 min |
| May 22, 5:27 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.