Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 117, NWS Denver/Boulder, CO

August 7, 2021Elbert County, Lincoln County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 7, 2021, 1:48 PM MDT for Elbert County, Lincoln County, Colorado. It was in force for 42 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 7, 2021, 1:48 PM MDT (19:48 UTC)
Expired: Aug 7, 2021, 2:30 PM MDT
In force: 42 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Elbert County, CO, Lincoln County, CO

The radar

The Pueblo radar (KPUX), 76 km from the middle of the area, began a volume at 19:49 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 7, 2:30 PM MDT	HAIL 1.25	6 W Boyero, CO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.8 hours before the alert went out and 104 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: 90 J/kg
Mixed-layer CIN: -282 J/kg
Mixed-layer LCL: 2495 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

465 
WUUS55 KBOU 071948
SVRBOU
COC039-073-072030-
/O.NEW.KBOU.SV.W.0117.210807T1948Z-210807T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
148 PM MDT Sat Aug 7 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Eastern Elbert County in east central Colorado...
  Central Lincoln County in east central Colorado...

* Until 230 PM MDT.

* At 148 PM MDT, a severe thunderstorm was located 11 miles northeast
  of Kutch, or 16 miles south of Limon, moving east at 25 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will remain over mainly rural areas of
  eastern Elbert and central Lincoln Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3891 10376 3901 10379 3908 10377 3911 10369
      3914 10345 3900 10336 3885 10343 3889 10368
TIME...MOT...LOC 1948Z 276DEG 23KT 3903 10373 

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

$$

RJK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 6:15 PM MDT	Special Weather Statement	BOU	Logan	45 min
Aug 6, 6:24 PM MDT	Special Weather Statement	BOU	Jackson	36 min
Aug 6, 6:53 PM MDT	Flash Flood Warning	BOU	Larimer	2 hr
Aug 6, 7:36 PM MDT	Special Weather Statement	BOU	Larimer	24 min
Aug 6, 7:58 PM MDT	Areal Flood Advisory	BOU	Larimer	2 hr
Aug 6, 10:06 PM MDT	Areal Flood Advisory	BOU	Larimer	84 min
Aug 7, 1:08 PM MDT	Special Weather Statement	BOU	Lincoln	52 min
Aug 7, 2:29 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	33 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.