Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Denver/Boulder, CO

May 22, 20214 counties in Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 22, 2021, 1:11 PM MDT for 4 counties in Colorado. It was in force for 49 min. 4 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, 1:11 PM MDT (19:11 UTC)
Expired
May 22, 2021, 2:00 PM MDT
In force
49 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Adams County, CO, Logan County, CO, Morgan County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 95 km from the middle of the area, began a volume at 19:11 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

TimeReportWhereRemark
May 22, 1:30 PM MDTTORNADO5 Ene Adena School, CO
May 22, 1:47 PM MDTTORNADO6 Se Brush, COBRIEF GROUND CIRCULATION.
May 22, 1:58 PM MDTHAIL 1.55 Wnw Midway, COM149, CHASING.
May 22, 2:03 PM MDTTORNADO1 Sw Midway, COBRIEF, WEAK TORNADO. HAS DISSIPATED.

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.

IssuedProductOfficeLasted
May 22, 12:20 PM MDTTornado WatchSPC8 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.2 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2021-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2021-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
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

Open this sounding in Storm Lab

The text

As transmitted.

848 
WUUS55 KBOU 221911
SVRBOU
COC001-075-087-121-222000-
/O.NEW.KBOU.SV.W.0034.210522T1911Z-210522T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
111 PM MDT Sat May 22 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Eastern Morgan County in northeastern Colorado...
  Northwestern Washington County in northeastern Colorado...
  Southwestern Logan County in northeastern Colorado...
  Northeastern Adams County in northeastern Colorado...

* Until 200 PM MDT.

* At 111 PM MDT, a severe thunderstorm was located near Woodrow, or
  18 miles southeast of Fort Morgan, moving north at 45 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...
  Fort Morgan, Brush, Log Lane Village, Merino, Hillrose, Gary,
  Prewitt Reservoir, Antelope Springs, Twelve-Mile Corner, Adena
  School, Woodlin School, Snyder, Midway and Woodrow.

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 4051 10328 3977 10331 3978 10375 3988 10380
      4050 10387
TIME...MOT...LOC 1911Z 181DEG 37KT 4001 10364 

HAIL...1.00IN
WIND...60MPH
 
$$

DANIELSON
1 follow-up statement
566 
WWUS55 KBOU 221939
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
139 PM MDT Sat May 22 2021

COC001-221948-
/O.CAN.KBOU.SV.W.0034.000000T0000Z-210522T2000Z/
Adams CO-
139 PM MDT Sat May 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ADAMS 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 4051 10328 4009 10330 4000 10362 4010 10379
      4050 10387
TIME...MOT...LOC 1938Z 181DEG 37KT 4029 10363 

$$

COC075-087-121-222000-
/O.CON.KBOU.SV.W.0034.000000T0000Z-210522T2000Z/
Morgan CO-Washington CO-Logan CO-
139 PM MDT Sat May 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM MDT
FOR EASTERN MORGAN...NORTHWESTERN WASHINGTON AND SOUTHWESTERN LOGAN
COUNTIES...

At 138 PM MDT, a severe thunderstorm was located near Brush, or 8
miles east of Fort Morgan, moving north at 45 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...
Fort Morgan, Brush, Log Lane Village, Merino, Hillrose, Gary, Prewitt
Reservoir, Antelope Springs, Snyder, Midway and Adena School.

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 4051 10328 4009 10330 4000 10362 4010 10379
      4050 10387
TIME...MOT...LOC 1938Z 181DEG 37KT 4029 10363 

HAIL...1.00IN
WIND...60MPH
 
$$

DANIELSON

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 7:18 PM MDTSpecial Weather StatementBOUMorgan27 min
May 21, 10:57 PM MDTSpecial Weather StatementBOUPhillips, Sedgwick48 min
May 22, 1:28 PM MDTTornado Warning Tornado observedBOUMorgan17 min
May 22, 1:45 PM MDTTornado WarningBOUMorgan15 min
May 22, 1:54 PM MDTTornado Warning Tornado observedBOUMorgan, Washington36 min
May 22, 1:56 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert28 min
May 22, 1:58 PM MDTSevere Thunderstorm WarningBOULogan, Morgan, Washington33 min
May 22, 2:05 PM MDTTornado WarningBOUAdams, Arapahoe25 min
May 22, 2:18 PM MDTSpecial Weather StatementBOUAdams42 min
May 22, 2:43 PM MDTTornado WarningBOULogan17 min
May 22, 2:46 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick44 min
May 22, 2:57 PM MDTSevere Thunderstorm WarningBOULogan, Sedgwick48 min
May 22, 3:01 PM MDTTornado WarningBOULogan29 min
May 22, 3:16 PM MDTTornado WarningBOULincoln29 min
May 22, 3:25 PM MDTSevere Thunderstorm WarningBOUWeld35 min
May 22, 3:48 PM MDTTornado WarningBOUElbert, Lincoln27 min
May 22, 3:53 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld26 min
May 22, 4:13 PM MDTTornado Warning Tornado observedBOUElbert, Lincoln32 min
May 22, 4:42 PM MDTTornado Warning Tornado observedBOUElbert, Lincoln33 min
May 22, 5:16 PM MDTTornado WarningBOUElbert, Lincoln29 min
May 22, 5:27 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln33 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.