Alert archive / Colorado / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

May 20, 2024Washington County, Colorado

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.

IssuedProductOfficeLasted
May 20, 4:07 PM MDTTornado WatchSPC7 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.

Skew-T log-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2024-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 248 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2024-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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

$$

MEIER
2 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

$$

MEIER
143 
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 

$$

MEIER

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 6:22 PM MDTSevere Thunderstorm WarningBOUMorgan38 min
May 20, 6:53 PM MDTSevere Thunderstorm Warning Considerable damage threatBOUMorgan, Washington52 min
May 20, 6:56 PM MDTTornado WarningBOUMorgan, Washington34 min
May 20, 7:04 PM MDTSevere Thunderstorm WarningBOUMorgan41 min
May 20, 7:30 PM MDTTornado WarningBOUWashington30 min
May 20, 7:36 PM MDTSevere Thunderstorm Warning Considerable damage threatBOUMorgan, Washington24 min
May 20, 7:49 PM MDTTornado WarningBOUWashington26 min
May 20, 7:51 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan39 min
May 20, 7:56 PM MDTTornado WarningBOUWashington34 min
May 20, 8:02 PM MDTSevere Thunderstorm Warning Considerable damage threatBOUMorgan, Washington43 min
May 20, 8:08 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan37 min
May 20, 8:14 PM MDTTornado WarningBOUAdams, Washington31 min
May 20, 8:41 PM MDTTornado WarningBOUWashington34 min
May 20, 8:44 PM MDTSevere Thunderstorm WarningBOUWashington46 min
May 20, 9:07 PM MDTFlash Flood WarningBOUWashington3 hr
May 20, 9:12 PM MDTSevere Thunderstorm WarningBOUWashington48 min
May 20, 9:16 PM MDTTornado WarningBOUWashington29 min
May 20, 9:44 PM MDTSevere Thunderstorm Warning Considerable damage threatBOUWashington46 min
May 20, 9:56 PM MDTTornado WarningBOUWashington34 min
May 20, 10:26 PM MDTSevere Thunderstorm Warning Considerable damage threatBOUWashington34 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.