Alert archive / Colorado / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 20, 2024, 8:29 PM MDT for Washington County, Colorado. It was in force for 46 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 20, 2024, 8:29 PM MDT (02:29 UTC)
- Expired
- May 20, 2024, 9:15 PM MDT
- In force
- 46 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Destructive
- Hail
- 2.75 in
- Wind
- 70.0 mph
County Washington County, CO
The radar
The Goodland radar (KGLD), 123 km from the middle of the area, began a volume at 02:31 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 20, 4:07 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.5 hours before the alert went out and 225 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
- 248 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 1142 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 296 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.0
The text
As transmitted.
626
WUUS55 KBOU 210229
SVRBOU
COC121-210315-
/O.NEW.KBOU.SV.W.0021.240521T0229Z-240521T0315Z/
BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
829 PM MDT Mon May 20 2024
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
East central Washington County in northeastern Colorado...
* Until 915 PM MDT.
* At 828 PM MDT, a severe thunderstorm was located 4 miles south of
Otis, or 11 miles west of Yuma, moving east at 15 mph.
THIS IS A DESTRUCTIVE STORM FOR HYDE.
HAZARD...Baseball size hail and 70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be severely injured.
Expect shattered windows, extensive damage to roofs,
siding, and vehicles.
* This severe thunderstorm will remain over mainly rural areas of
east central Washington County, including the following
locations... Hyde.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building, and stay away from windows.
A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado.
&&
LAT...LON 4000 10280 3994 10280 4000 10296 4012 10298
4023 10280 4002 10279 4000 10279
TIME...MOT...LOC 0228Z 270DEG 11KT 4008 10293
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
MEIER2 follow-up statements
536
WWUS55 KBOU 210302
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
902 PM MDT Mon May 20 2024
COC121-210315-
/O.CON.KBOU.SV.W.0021.000000T0000Z-240521T0315Z/
Washington CO-
902 PM MDT Mon May 20 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM MDT
FOR NORTHEASTERN WASHINGTON COUNTY...
At 902 PM MDT, a severe thunderstorm was located 4 miles west of
Yuma, moving east at 10 mph.
HAZARD...Two inch hail and 70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings. People and animals outdoors
will be injured. Expect hail damage to roofs, siding,
windows, and vehicles.
This severe thunderstorm will remain over mainly rural areas of
northeastern Washington County, which includes Hyde.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado.
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
&&
LAT...LON 4000 10280 3999 10280 4004 10291 4014 10295
4023 10280 4002 10279 4000 10279
TIME...MOT...LOC 0302Z 260DEG 10KT 4012 10280
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
MEIER143
WWUS55 KBOU 210312
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
912 PM MDT Mon May 20 2024
COC121-210320-
/O.EXP.KBOU.SV.W.0021.000000T0000Z-240521T0315Z/
Washington CO-
912 PM MDT Mon May 20 2024
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON COUNTY
WILL EXPIRE AT 915 PM MDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado.
Remember, a Severe Thunderstorm Warning still remains in effect for
Northwest Yuma County and parts of central Washington County.
LAT...LON 4000 10280 3999 10280 4004 10291 4014 10295
4023 10280 4002 10279 4000 10279
TIME...MOT...LOC 0310Z 270DEG 11KT 4012 10277
$$
MEIERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 6:22 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 38 min |
| May 20, 6:53 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 52 min |
| May 20, 6:56 PM MDT | Tornado Warning | BOU | Morgan, Washington | 34 min |
| May 20, 7:04 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 41 min |
| May 20, 7:30 PM MDT | Tornado Warning | BOU | Washington | 30 min |
| May 20, 7:36 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 24 min |
| May 20, 7:49 PM MDT | Tornado Warning | BOU | Washington | 26 min |
| May 20, 7:51 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan | 39 min |
| May 20, 7:56 PM MDT | Tornado Warning | BOU | Washington | 34 min |
| May 20, 8:02 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 43 min |
| May 20, 8:08 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan | 37 min |
| May 20, 8:14 PM MDT | Tornado Warning | BOU | Adams, Washington | 31 min |
| May 20, 8:41 PM MDT | Tornado Warning | BOU | Washington | 34 min |
| May 20, 8:44 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 46 min |
| May 20, 9:07 PM MDT | Flash Flood Warning | BOU | Washington | 3 hr |
| May 20, 9:12 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 48 min |
| May 20, 9:16 PM MDT | Tornado Warning | BOU | Washington | 29 min |
| May 20, 9:44 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 46 min |
| May 20, 9:56 PM MDT | Tornado Warning | BOU | Washington | 34 min |
| May 20, 10:26 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 34 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2024Every severe thunderstorm warning in 2024
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.