Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 94, NWS Denver/Boulder, CO

July 3, 2021Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 3, 2021, 3:57 PM MDT for Morgan County, Weld County, Colorado. It was in force for 33 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: Jul 3, 2021, 3:57 PM MDT (21:57 UTC)
Expired: Jul 3, 2021, 4:30 PM MDT
In force: 33 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Morgan County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 74 km from the middle of the area, began a volume at 21:58 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
Jul 3, 3:33 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.0 hours before the alert went out and 97 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.

864 
WUUS55 KBOU 032157
SVRBOU
COC087-123-032230-
/O.NEW.KBOU.SV.W.0094.210703T2157Z-210703T2230Z/

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

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  South central Weld County in northeastern Colorado...
  Northwestern Morgan County in northeastern Colorado...

* Until 430 PM MDT.

* At 357 PM MDT, a severe thunderstorm was located near Orchard, or
  20 miles west of Fort Morgan, moving southeast at 15 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Wiggins, Jackson Reservoir, Orchard, Weldona, Goodrich and
  Riverside Reservoir.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near a lake, get away from the water and move indoors or 
inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4044 10430 4051 10410 4031 10389 4019 10419
TIME...MOT...LOC 2157Z 326DEG 15KT 4036 10415 

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

RPK

2 follow-up statements

061 
WWUS55 KBOU 032209
SVSBOU

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

COC123-032218-
/O.CAN.KBOU.SV.W.0094.000000T0000Z-210703T2230Z/
Weld CO-
409 PM MDT Sat Jul 3 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WELD COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4031 10389 4021 10415 4045 10415 4048 10407
TIME...MOT...LOC 2208Z 319DEG 15KT 4033 10410 

$$

COC087-032230-
/O.CON.KBOU.SV.W.0094.000000T0000Z-210703T2230Z/
Morgan CO-
409 PM MDT Sat Jul 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM MDT
FOR NORTHWESTERN MORGAN COUNTY...

At 408 PM MDT, a severe thunderstorm was located over Orchard, or 16
miles west of Fort Morgan, moving southeast at 15 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
Jackson Reservoir, Orchard, Weldona and Goodrich. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near a LAKE, get away from the water and move indoors or 
inside a vehicle. remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4031 10389 4021 10415 4045 10415 4048 10407
TIME...MOT...LOC 2208Z 319DEG 15KT 4033 10410 

HAIL...1.50IN
WIND...<50MPH
 
$$

RPK

818 
WWUS55 KBOU 032226
SVSBOU

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

COC087-032236-
/O.EXP.KBOU.SV.W.0094.000000T0000Z-210703T2230Z/
Morgan CO-
426 PM MDT Sat Jul 3 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MORGAN COUNTY
WILL EXPIRE AT 430 PM MDT...
                
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 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 4031 10389 4021 10415 4045 10415 4048 10407
TIME...MOT...LOC 2226Z 326DEG 15KT 4027 10405 

$$

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, 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, 4:59 PM MDT	Severe Thunderstorm Warning	BOU	Logan	31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.