Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 6, NWS Denver/Boulder, CO

April 27, 2021Adams County, Morgan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 27, 2021, 2:43 PM MDT for Adams County, Morgan County, Colorado. It was in force for 32 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: Apr 27, 2021, 2:43 PM MDT (20:43 UTC)
Expired: Apr 27, 2021, 3:15 PM MDT
In force: 32 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Adams County, CO, Morgan County, CO

The radar

The Denver radar (KFTG), 74 km from the middle of the area, began a volume at 20:47 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
Apr 27, 11:45 AM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.7 hours before the alert went out and 46 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3214 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

189 
WUUS55 KBOU 272043
SVRBOU
COC001-087-272115-
/O.NEW.KBOU.SV.W.0006.210427T2043Z-210427T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
243 PM MDT Tue Apr 27 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Southeastern Morgan County in northeastern Colorado...
  Northeastern Adams County in northeastern Colorado...

* Until 315 PM MDT.

* At 242 PM MDT, a severe thunderstorm was located 5 miles north of
  Shamrock, or 20 miles south of Fort Morgan, moving north at 10 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected. Hail may accumulate on 
           roadways causing hazardous travel.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 4013 10359 4000 10360 4000 10370 3987 10371
      3987 10397 4015 10399
TIME...MOT...LOC 2042Z 185DEG 7KT 3996 10379 

HAIL...1.00IN
WIND...<50MPH
 
$$

DANIELSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 1:52 AM MDT	Severe Thunderstorm Warning	BOU	Washington	23 min
Apr 27, 3:16 AM MDT	Winter Storm Warning	BOU	Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more	30 hr
Apr 27, 11:35 AM MDT	Special Weather Statement	BOU	Douglas	25 min
Apr 27, 11:55 AM MDT	Special Weather Statement	BOU	Elbert	50 min
Apr 27, 11:59 AM MDT	Special Weather Statement	BOU	Denver	31 min
Apr 27, 12:49 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	26 min
Apr 27, 1:15 PM MDT	Special Weather Statement	BOU	Adams	45 min
Apr 27, 1:51 PM MDT	Special Weather Statement	BOU	Lincoln	39 min
Apr 27, 1:53 PM MDT	Special Weather Statement	BOU	Weld	37 min
Apr 27, 1:59 PM MDT	Severe Thunderstorm Warning	BOU	Weld	31 min
Apr 27, 2:02 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	28 min
Apr 27, 2:08 PM MDT	Winter Weather Advisory	BOU	Clear Creek, Douglas, Gilpin, Jefferson, Park	20 hr
Apr 27, 2:23 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	52 min
Apr 27, 2:49 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	41 min
Apr 27, 3:00 PM MDT	Special Weather Statement	BOU	Lincoln	45 min
Apr 27, 3:10 PM MDT	Special Weather Statement	BOU	Morgan	20 min
Apr 27, 3:13 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan, Washington	32 min
Apr 27, 3:28 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	47 min
Apr 27, 3:32 PM MDT	Special Weather Statement	BOU	Morgan	28 min
Apr 27, 3:41 PM MDT	Tornado Warning	BOU	Lincoln	34 min
Apr 27, 4:12 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	33 min
Apr 27, 4:16 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Washington	17 min
Apr 27, 4:36 PM MDT	Tornado Warning	BOU	Lincoln	24 min
Apr 27, 5:19 PM MDT	Severe Thunderstorm Warning	BOU	Washington	26 min
Apr 27, 5:51 PM MDT	Special Weather Statement	BOU	Phillips	24 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2021 Every 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.