Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 96, NWS Denver/Boulder, CO

July 3, 2021Logan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 3, 2021, 4:59 PM MDT for Logan County, Colorado. It was in force for 31 min. 1 report 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: Jul 3, 2021, 4:59 PM MDT (22:59 UTC)
Expired: Jul 3, 2021, 5:30 PM MDT
In force: 31 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 168 km from the middle of the area, began a volume at 23:02 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

Time	Report	Where	Remark
Jul 3, 5:06 PM MDT	HAIL 1.25	2 Wsw Twin Buttes, CO	L500.

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.

Issued	Product	Office	Lasted
Jul 3, 3:33 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.0 hours before the alert went out and 114 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: 2605 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

984 
WUUS55 KBOU 032259
SVRBOU
COC075-032330-
/O.NEW.KBOU.SV.W.0096.210703T2259Z-210703T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
459 PM MDT Sat Jul 3 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Northeastern Logan County in northeastern Colorado...

* Until 530 PM MDT.

* At 459 PM MDT, a severe thunderstorm was located near Crook, or 18
  miles south of Sidney, moving east at 10 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Crook, Proctor and Twin Buttes. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4079 10296 4100 10289 4095 10266 4074 10272
TIME...MOT...LOC 2259Z 290DEG 8KT 4088 10285 

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

RPK

1 follow-up statement

585 
WWUS55 KBOU 032324
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
524 PM MDT Sat Jul 3 2021

COC075-032333-
/O.EXP.KBOU.SV.W.0096.000000T0000Z-210703T2330Z/
Logan CO-
524 PM MDT Sat Jul 3 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LOGAN COUNTY WILL
EXPIRE AT 530 PM MDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northeastern Colorado.

LAT...LON 4079 10296 4100 10289 4095 10266 4074 10272
TIME...MOT...LOC 2323Z 290DEG 8KT 4086 10279 

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 6:36 PM MDT	Special Weather Statement	BOU	Denver	24 min
Jul 2, 6:42 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	33 min
Jul 2, 7:11 PM MDT	Areal Flood Advisory	BOU	Adams	47 min
Jul 2, 7:13 PM MDT	Special Weather Statement	BOU	Denver	32 min
Jul 2, 7:17 PM MDT	Areal Flood Advisory	BOU	Larimer	88 min
Jul 3, 2:03 PM MDT	Areal Flood Advisory	BOU	Larimer	87 min
Jul 3, 2:22 PM MDT	Special Weather Statement	BOU	Weld	38 min
Jul 3, 3:11 PM MDT	Special Weather Statement	BOU	Weld	34 min
Jul 3, 3:23 PM MDT	Severe Thunderstorm Warning	BOU	Weld	37 min
Jul 3, 3:57 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	33 min
Jul 3, 4:25 PM MDT	Special Weather Statement	BOU	Logan	20 min
Jul 3, 4:34 PM MDT	Special Weather Statement	BOU	Logan	26 min
Jul 3, 4:45 PM MDT	Special Weather Statement	BOU	Morgan	30 min
Jul 3, 4:53 PM MDT	Severe Thunderstorm Warning	BOU	Washington	37 min
Jul 3, 5:05 PM MDT	Severe Thunderstorm Warning	BOU	Logan	25 min
Jul 3, 5:14 PM MDT	Special Weather Statement	BOU	Elbert	31 min
Jul 3, 5:20 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	25 min
Jul 3, 5:29 PM MDT	Severe Thunderstorm Warning	BOU	Washington	31 min
Jul 3, 5:38 PM MDT	Areal Flood Advisory	BOU	Logan	82 min
Jul 3, 5:40 PM MDT	Areal Flood Advisory	BOU	Elbert	95 min
Jul 3, 5:56 PM MDT	Severe Thunderstorm Warning	BOU	Washington	34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.