Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 210, NWS Goodland, KS

August 19, 2021Yuma County, Colorado

NWS Goodland, KS issued this severe thunderstorm warning at Aug 19, 2021, 7:31 PM MDT for Yuma County, Colorado. It was in force for 59 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: Aug 19, 2021, 7:31 PM MDT (01:31 UTC)
Expired: Aug 19, 2021, 8:30 PM MDT
In force: 59 min
Issued by: NWS Goodland, KS
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Yuma County, CO

The radar

The Goodland radar (KGLD), 113 km from the middle of the area, began a volume at 01:32 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.

What was reported inside it

Time	Report	Where	Remark
Aug 19, 8:40 PM MDT	HAIL 1	4 Nne Wray, CO	PEA TO QUARTER SIZE HAIL FELL.

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
Aug 19, 5:25 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.5 hours before the alert went out and 96 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: 56 J/kg
Mixed-layer CIN: -210 J/kg
Mixed-layer LCL: 1497 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

192 
WUUS53 KGLD 200131
SVRGLD
COC125-200230-
/O.NEW.KGLD.SV.W.0210.210820T0131Z-210820T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Goodland KS
731 PM MDT Thu Aug 19 2021

The National Weather Service in Goodland has issued a

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

* Until 830 PM MDT.

* At 730 PM MDT, severe thunderstorms were located along a line
  extending from 6 miles southeast of Holyoke to 14 miles northwest
  of Wray to 4 miles south of Eckley, moving northeast at 25 mph.

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

  SOURCE...Radar indicated.

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

* These severe thunderstorms will remain over mainly rural areas of
  northeastern Yuma County, including the following locations...
  Alvin and Wauneta.

This includes Highway 385 between mile markers 247 and 270.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

&&

LAT...LON 4044 10205 4030 10205 4017 10208 4001 10260
      4025 10249 4044 10245
TIME...MOT...LOC 0130Z 236DEG 20KT 4051 10224 4026 10236 4004 10247 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

KMK/JRM

3 follow-up statements

741 
WWUS53 KGLD 200147
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
747 PM MDT Thu Aug 19 2021

COC125-200230-
/O.CON.KGLD.SV.W.0210.000000T0000Z-210820T0230Z/
Yuma CO-
747 PM MDT Thu Aug 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN YUMA COUNTY...

At 747 PM MDT, severe thunderstorms were located along a line
extending from 3 miles south of Pleasant Valley to 16 miles north of
Wray to 6 miles east of Eckley, moving northeast at 25 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Eckley, Alvin and Wauneta. 

This includes Highway 385 between mile markers 248 and 270.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

LAT...LON 4044 10205 4030 10205 4017 10208 4006 10253
      4026 10246 4044 10243
TIME...MOT...LOC 0147Z 236DEG 20KT 4056 10214 4031 10226 4009 10237 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

KMK/JRM

956 
WWUS53 KGLD 200158
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
758 PM MDT Thu Aug 19 2021

COC125-200230-
/O.CON.KGLD.SV.W.0210.000000T0000Z-210820T0230Z/
Yuma CO-
758 PM MDT Thu Aug 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN YUMA COUNTY...

At 758 PM MDT, severe thunderstorms were located along a line
extending from near Pleasant Valley to 17 miles south of Holyoke to 5
miles northwest of Wray, moving northeast at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

These severe thunderstorms will remain over mainly rural areas of
northeastern Yuma County, including the following locations... Alvin
and Wauneta.

This includes Highway 385 between mile markers 249 and 270.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

LAT...LON 4044 10205 4030 10205 4017 10208 4009 10248
      4027 10242 4044 10236
TIME...MOT...LOC 0158Z 236DEG 20KT 4059 10208 4034 10220 4012 10231 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

KMK/JRM

013 
WWUS53 KGLD 200220
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
820 PM MDT Thu Aug 19 2021

COC125-200230-
/O.CON.KGLD.SV.W.0210.000000T0000Z-210820T0230Z/
Yuma CO-
820 PM MDT Thu Aug 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN YUMA COUNTY...

At 820 PM MDT, severe thunderstorms were located along a line
extending from 5 miles north of Lamar to 14 miles south of Pleasant
Valley to 7 miles north of Wray, moving northeast at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Alvin and Wauneta. 

This includes Highway 385 between mile markers 248 and 269.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A Tornado Watch remains in effect until 1100 PM MDT for northeastern
Colorado...and southwestern Nebraska.

LAT...LON 4044 10205 4030 10205 4017 10208 4010 10241
      4024 10235 4044 10230
TIME...MOT...LOC 0220Z 236DEG 20KT 4065 10196 4040 10208 4018 10219 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

KMK/JRM

The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 6:28 PM MDT	Special Weather Statement	GLD	Phillips	47 min
Aug 19, 6:31 PM MDT	Special Weather Statement	GLD	Yuma	44 min
Aug 19, 6:46 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	44 min
Aug 19, 7:17 PM MDT	Special Weather Statement	GLD	Phillips	28 min
Aug 19, 7:36 PM MDT	Tornado Warning	GLD	Yuma	24 min
Aug 19, 7:50 PM MDT	Flash Flood Warning	GLD	Yuma	5 hr
Aug 19, 8:08 PM MDT	Tornado Warning	GLD	Yuma	22 min
Aug 19, 8:44 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	31 min
Aug 19, 9:14 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	46 min
Aug 19, 9:49 PM MDT	Special Weather Statement	GLD	Yuma	26 min
Aug 19, 10:48 PM MDT	Special Weather Statement	GLD	Phillips	42 min
Aug 19, 10:51 PM MDT	Special Weather Statement	GLD	Yuma	39 min
Aug 20, 12:31 AM MDT	Areal Flood Warning	GLD	Yuma	6 hr
Aug 20, 5:40 AM MDT	Special Weather Statement	GLD	Phillips	35 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.