Alert archive / Colorado / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS Goodland, KS

May 9, 2017Cheyenne County, Colorado

NWS Goodland, KS issued this severe thunderstorm warning at May 9, 2017, 6:33 PM MDT for Cheyenne County, Colorado. It was in force for 42 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 9, 2017, 6:33 PM MDT (00:33 UTC)
Expired: May 9, 2017, 7:15 PM MDT
In force: 42 min
Issued by: NWS Goodland, KS
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Cheyenne County, CO

The radar

The Goodland radar (KGLD), 77 km from the middle of the area, began a volume at 00:37 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
May 9, 5:51 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 0.6 hours before the alert went out and 133 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: 970 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: -30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

176 
WUUS53 KGLD 100033
SVRGLD
COC017-100115-
/O.NEW.KGLD.SV.W.0021.170510T0033Z-170510T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Goodland KS
633 PM MDT TUE MAY 9 2017

The National Weather Service in Goodland has issued a

* Severe Thunderstorm Warning for...
  Eastern Cheyenne County in east central Colorado...

* Until 715 PM MDT

* At 633 PM MDT, severe thunderstorms were located along a line
  extending from 9 miles north of Brandon to 6 miles north of
  Sheridan Lake, moving north at 35 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Cheyenne Wells, Arapahoe and Firstview. 

This includes Highway 385 between mile markers 136 and 169.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3904 10260 3905 10205 3897 10204 3861 10220
      3861 10255
TIME...MOT...LOC 0033Z 188DEG 32KT 3858 10249 3855 10232 

HAIL...1.25IN
WIND...60MPH
 
$$

Husted

2 follow-up statements

172 
WWUS53 KGLD 100046
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
646 PM MDT TUE MAY 9 2017

COC017-100115-
/O.CON.KGLD.SV.W.0021.000000T0000Z-170510T0115Z/
Cheyenne CO-
646 PM MDT TUE MAY 9 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT
FOR EASTERN CHEYENNE COUNTY IN EAST CENTRAL COLORADO...

At 645 PM MDT, a severe thunderstorm was located 12 miles north of
Sheridan Lake, or 12 miles south of Cheyenne Wells, moving northeast
at 30 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Cheyenne Wells and Arapahoe. 

This includes Highway 385 between mile markers 136 and 169.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.

&&

LAT...LON 3905 10205 3897 10204 3861 10220 3861 10249
      3904 10253
TIME...MOT...LOC 0045Z 203DEG 28KT 3864 10233 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

Husted

728 
WWUS53 KGLD 100059
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
659 PM MDT TUE MAY 9 2017

COC017-100115-
/O.CON.KGLD.SV.W.0021.000000T0000Z-170510T0115Z/
Cheyenne CO-
659 PM MDT TUE MAY 9 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT
FOR EASTERN CHEYENNE COUNTY IN EAST CENTRAL COLORADO...

At 659 PM MDT, a severe thunderstorm was located 4 miles southeast of
Cheyenne Wells, moving north at 35 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...
Cheyenne Wells and Arapahoe. 

This includes Highway 385 between mile markers 141 and 161.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
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.

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

&&

LAT...LON 3902 10209 3897 10204 3861 10220 3869 10230
      3870 10244 3896 10249
TIME...MOT...LOC 0059Z 188DEG 32KT 3877 10231 

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

Husted

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 6:14 PM MDT	Special Weather Statement	GLD	Cheyenne	31 min
May 9, 6:58 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne	47 min
May 10, 3:10 PM MDT	Special Weather Statement	GLD	Cheyenne	50 min
May 10, 3:46 PM MDT	Special Weather Statement	GLD	Cheyenne	44 min
May 10, 4:39 PM MDT	Flash Flood Warning	GLD	Cheyenne	3 hr
May 10, 5:12 PM MDT	Special Weather Statement	GLD	Cheyenne	63 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2017 Every severe thunderstorm warning in 2017

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.