Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 124, NWS Denver/Boulder, CO

August 14, 2021Sedgwick County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 14, 2021, 8:29 PM MDT for Sedgwick County, Colorado. It was in force for 46 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 14, 2021, 8:29 PM MDT (02:29 UTC)
Expired: Aug 14, 2021, 9:15 PM MDT
In force: 46 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

County Sedgwick County, CO

The radar

The Goodland radar (KGLD), 175 km from the middle of the area, began a volume at 02:32 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 14, 9:13 PM MDT	HAIL 0.88	5 S Sedgwick, CO

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 14, 3:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.5 hours before the alert went out and 129 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: 666 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 3335 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

450 
WUUS55 KBOU 150229
SVRBOU
COC115-150315-
/O.NEW.KBOU.SV.W.0124.210815T0229Z-210815T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
829 PM MDT Sat Aug 14 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Western Sedgwick County in northeastern Colorado...

* Until 915 PM MDT.

* At 828 PM MDT, a severe thunderstorm was located near Chappell,
  moving south at 30 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.

* This severe thunderstorm will be near...
  Ovid around 840 PM MDT.
  Sedgwick around 845 PM MDT.

Other locations in the path of this severe thunderstorm include Marks
Butte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 4075 10227 4075 10265 4100 10256 4100 10228
TIME...MOT...LOC 0228Z 017DEG 25KT 4105 10242 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BARJENBRUCH

1 follow-up statement

550 
WWUS55 KBOU 150302
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
902 PM MDT Sat Aug 14 2021

COC115-150315-
/O.CON.KBOU.SV.W.0124.000000T0000Z-210815T0315Z/
Sedgwick CO-
902 PM MDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM MDT
FOR SOUTHWESTERN SEDGWICK COUNTY...

At 902 PM MDT, a severe thunderstorm was located over Marks Butte, or
15 miles southwest of Julesburg, moving south at 25 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of
southwestern Sedgwick County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4075 10235 4075 10265 4093 10252 4093 10239
TIME...MOT...LOC 0302Z 013DEG 22KT 4084 10249 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BARJENBRUCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 6:48 PM MDT	Flash Flood Warning	BOU	Larimer	115 min
Aug 14, 7:15 PM MDT	Special Weather Statement	BOU	Summit	30 min
Aug 14, 7:38 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Weld	52 min
Aug 14, 8:01 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Logan	44 min
Aug 14, 8:28 PM MDT	Severe Thunderstorm Warning	BOU	Weld	47 min
Aug 14, 8:43 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Logan, Washington	47 min
Aug 14, 9:15 PM MDT	Severe Thunderstorm Warning	BOU	Phillips, Sedgwick	14 min
Aug 14, 9:28 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Washington	47 min
Aug 14, 9:31 PM MDT	Special Weather Statement	BOU	Weld	44 min
Aug 15, 2:32 PM MDT	Areal Flood Advisory	BOU	Grand	88 min
Aug 15, 5:19 PM MDT	Special Weather Statement	BOU	Lincoln	41 min
Aug 15, 5:25 PM MDT	Special Weather Statement	BOU	Teller	65 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.