Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 106, NWS Denver/Boulder, CO

July 15, 2021Lincoln County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 15, 2021, 1:37 PM MDT for Lincoln County, Colorado. It was in force for 38 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 15, 2021, 1:37 PM MDT (19:37 UTC)
Expired
Jul 15, 2021, 2:15 PM MDT
In force
38 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Lincoln County, CO

The radar

The Denver radar (KFTG), 96 km from the middle of the area, began a volume at 19:37 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 nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.6 hours before the alert went out and 76 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2021-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2021-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
6 J/kg
Mixed-layer CIN
-427 J/kg
Mixed-layer LCL
1726 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

230 
WUUS55 KBOU 151937
SVRBOU
COC073-152015-
/O.NEW.KBOU.SV.W.0106.210715T1937Z-210715T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
137 PM MDT Thu Jul 15 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  North central Lincoln County in east central Colorado...

* Until 215 PM MDT.

* At 137 PM MDT, a severe thunderstorm was located near Limon, moving
  southeast at 10 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Limon and Genoa. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3929 10371 3935 10372 3937 10363 3922 10343
      3911 10372
TIME...MOT...LOC 1937Z 335DEG 5KT 3932 10370 

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

ENTREKIN
2 follow-up statements
956 
WWUS55 KBOU 151956
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
156 PM MDT Thu Jul 15 2021

COC073-152015-
/O.CON.KBOU.SV.W.0106.000000T0000Z-210715T2015Z/
Lincoln CO-
156 PM MDT Thu Jul 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM MDT
FOR NORTH CENTRAL LINCOLN COUNTY...

At 155 PM MDT, a severe thunderstorm was located near Limon, moving
southeast at 15 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.

Locations impacted include...
Limon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3929 10371 3934 10361 3922 10343 3911 10372
TIME...MOT...LOC 1955Z 325DEG 11KT 3928 10366 

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

ENTREKIN
396 
WWUS55 KBOU 152012
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
212 PM MDT Thu Jul 15 2021

COC073-152021-
/O.EXP.KBOU.SV.W.0106.000000T0000Z-210715T2015Z/
Lincoln CO-
212 PM MDT Thu Jul 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL LINCOLN COUNTY
WILL EXPIRE AT 215 PM MDT...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire. However gusty 
winds are still possible with this thunderstorm.

LAT...LON 3929 10371 3934 10361 3922 10343 3911 10372
TIME...MOT...LOC 2011Z 335DEG 5KT 3928 10366 

$$

ENTREKIN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 6:06 PM MDTSpecial Weather StatementBOUWeld24 min
Jul 14, 6:29 PM MDTSpecial Weather StatementBOUMorgan31 min
Jul 14, 6:47 PM MDTAreal Flood AdvisoryBOUDenver88 min
Jul 14, 7:39 PM MDTAreal Flood AdvisoryBOUMorgan72 min
Jul 15, 2:42 PM MDTSpecial Weather StatementBOULincoln48 min
Jul 15, 2:59 PM MDTSevere Thunderstorm WarningBOULincoln46 min
Jul 15, 3:19 PM MDTSpecial Weather StatementBOUWashington26 min
Jul 15, 3:38 PM MDTSevere Thunderstorm WarningBOULincoln52 min
Jul 15, 5:01 PM MDTSevere Thunderstorm WarningBOUWeld44 min
Jul 15, 5:44 PM MDTSevere Thunderstorm WarningBOUWeld29 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2021Every 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.