Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Denver/Boulder, CO

May 14, 2021Adams County, Morgan County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 14, 2021, 9:29 PM MDT for Adams County, Morgan County, 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 14, 2021, 9:29 PM MDT (03:29 UTC)
Expired
May 14, 2021, 10:15 PM MDT
In force
46 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

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

The radar

The Denver radar (KFTG), 69 km from the middle of the area, began a volume at 03:32 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 14, 3:46 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 3.5 hours before the alert went out and 53 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 00:00Z on 2021-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 137 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2021-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.193958Sfc1 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
137 J/kg
Mixed-layer CIN
-133 J/kg
Mixed-layer LCL
1940 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

045 
WUUS55 KBOU 150329
SVRBOU
COC001-087-121-150415-
/O.NEW.KBOU.SV.W.0026.210515T0329Z-210515T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
929 PM MDT Fri May 14 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  South central Morgan County in northeastern Colorado...
  West central Washington County in northeastern Colorado...
  Northeastern Adams County in northeastern Colorado...

* Until 1015 PM MDT.

* At 929 PM MDT, a severe thunderstorm was located over Twelve-Mile
  Corner, or 12 miles south of Fort Morgan, moving southeast at 25
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Trained weather spotters.

  IMPACT...Expect damage to roofs, siding, and trees. Hail damage to 
           vehicles is expected.

* Locations impacted include...
  Twelve-Mile Corner, Shamrock, Adena School, Woodrow and Adena. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 4015 10395 4021 10383 3994 10345 3976 10384
TIME...MOT...LOC 0329Z 321DEG 24KT 4007 10381 

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

DIRENZO
2 follow-up statements
614 
WWUS55 KBOU 150350
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
950 PM MDT Fri May 14 2021

COC001-150357-
/O.CAN.KBOU.SV.W.0026.000000T0000Z-210515T0415Z/
Adams CO-
950 PM MDT Fri May 14 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.

LAT...LON 3994 10345 3986 10363 3996 10371 4000 10370
      4000 10374 4007 10379 4013 10372
TIME...MOT...LOC 0347Z 309DEG 25KT 4003 10365 

$$

COC087-121-150415-
/O.CON.KBOU.SV.W.0026.000000T0000Z-210515T0415Z/
Morgan CO-Washington CO-
950 PM MDT Fri May 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM MDT
FOR SOUTH CENTRAL MORGAN AND WEST CENTRAL WASHINGTON COUNTIES...

At 947 PM MDT, a severe thunderstorm was located 4 miles northwest of
Woodrow, or 17 miles southeast of Fort Morgan, moving southeast at 30
mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Expect damage to roofs, siding, and trees. Hail damage to 
         vehicles is expected.

Locations impacted include...
Woodrow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 3994 10345 3986 10363 3996 10371 4000 10370
      4000 10374 4007 10379 4013 10372
TIME...MOT...LOC 0347Z 309DEG 25KT 4003 10365 

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

DIRENZO
615 
WWUS55 KBOU 150417
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
1017 PM MDT Fri May 14 2021

COC087-121-150426-
/O.EXP.KBOU.SV.W.0026.000000T0000Z-210515T0415Z/
Morgan CO-Washington CO-
1017 PM MDT Fri May 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MORGAN AND WEST
CENTRAL WASHINGTON COUNTIES HAS EXPIRED...
                
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 allowed to expire.

LAT...LON 3994 10345 3986 10363 3996 10371 4000 10370
      4000 10374 4007 10379 4013 10372
TIME...MOT...LOC 0416Z 321DEG 24KT 3990 10351 

$$

RJK

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 6:49 PM MDTSevere Thunderstorm WarningBOUWeld41 min
May 14, 6:52 PM MDTSpecial Weather StatementBOUMorgan38 min
May 14, 7:17 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington28 min
May 14, 7:36 PM MDTSevere Thunderstorm WarningBOUWeld39 min
May 14, 7:40 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington50 min
May 14, 8:14 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld46 min
May 14, 8:52 PM MDTSevere Thunderstorm WarningBOUMorgan38 min
May 15, 2:21 PM MDTSpecial Weather StatementBOULarimer24 min
May 15, 2:50 PM MDTSpecial Weather StatementBOUDenver25 min
May 15, 5:29 PM MDTSpecial Weather StatementBOUDouglas31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.