Severe Thunderstorm Warning 151, NWS Denver/Boulder, CO

Issued

Sep 3, 2021, 1:20 PM MDT (19:20 UTC)

Expired

Sep 3, 2021, 2:00 PM MDT

In force

40 min

Issued by

NWS Denver/Boulder, CO

Area

Storm-based polygon

Hail

1.25 in

Wind

60.0 mph

Counties Arapahoe County, CO, Douglas County, CO

The Denver radar (KFTG), 42 km from the middle of the area, began a volume at 19:20 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.

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

894 
WUUS55 KBOU 031920
SVRBOU
COC005-035-032000-
/O.NEW.KBOU.SV.W.0151.210903T1920Z-210903T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
120 PM MDT Fri Sep 3 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Northeastern Douglas County in northeastern Colorado...
  Southwestern Arapahoe County in northeastern Colorado...

* Until 200 PM MDT.

* At 119 PM MDT, a severe thunderstorm was located over western
  Highlands Ranch, or 13 miles south of Denver, moving east at 15
  mph.

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

  SOURCE...Radar indicated. This storm has produced nickel size hail 
           and wind gusts to 54 mph and is strengthening.

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

* Locations impacted include...
  Southwestern Aurora, Centennial, Highlands Ranch, northern Castle
  Rock, Parker, Littleton, southern Englewood, Greenwood Village,
  Lone Tree, Roxborough Park, Sheridan, The Pinery, Louviers,
  Franktown, Castle Pines, Sedalia and Ponderosa Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Cherry Creek Reservoir, get away from the water and 
move indoors or inside a vehicle. Remember, lightning can strike out 
to 15 miles from the parent thunderstorm. If you can hear thunder, 
you are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

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

&&

LAT...LON 3946 10509 3954 10508 3956 10505 3963 10505
      3963 10502 3964 10503 3963 10491 3962 10491
      3962 10489 3963 10488 3962 10466 3933 10466
TIME...MOT...LOC 1919Z 282DEG 14KT 3954 10500 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

GIMMESTAD

148 
WWUS55 KBOU 031945
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
145 PM MDT Fri Sep 3 2021

COC005-035-032000-
/O.CON.KBOU.SV.W.0151.000000T0000Z-210903T2000Z/
Douglas CO-Arapahoe CO-
145 PM MDT Fri Sep 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM MDT
FOR NORTHEASTERN DOUGLAS AND SOUTHWESTERN ARAPAHOE COUNTIES...

At 144 PM MDT, a severe thunderstorm was located near Lone Tree, or
14 miles south of Denver, moving east at 15 mph.

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

SOURCE...Trained weather spotters. A wind gust to 64 mph was 
         reported at Centennial Airport at 135 PM.

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

Locations impacted include...
Southwestern Aurora, Centennial, Highlands Ranch, northern Castle
Rock, Parker, Littleton, southern Englewood, Greenwood Village, Lone
Tree, Roxborough Park, Sheridan, The Pinery, Louviers, Franktown,
Castle Pines, Sedalia and Ponderosa Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

LAT...LON 3946 10509 3954 10508 3956 10505 3963 10505
      3963 10502 3964 10503 3963 10491 3962 10491
      3962 10489 3963 10488 3962 10466 3933 10466
TIME...MOT...LOC 1944Z 282DEG 14KT 3952 10488 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

GIMMESTAD

208 
WWUS55 KBOU 032000
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
200 PM MDT Fri Sep 3 2021

COC005-035-032009-
/O.EXP.KBOU.SV.W.0151.000000T0000Z-210903T2000Z/
Douglas CO-Arapahoe CO-
200 PM MDT Fri Sep 3 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DOUGLAS AND
SOUTHWESTERN ARAPAHOE COUNTIES WILL EXPIRE AT 200 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this 
thunderstorm as it moves east from the Parker area over the next 
hour.

LAT...LON 3946 10509 3954 10508 3956 10505 3963 10505
      3963 10502 3964 10503 3963 10491 3962 10491
      3962 10489 3963 10488 3962 10466 3933 10466
TIME...MOT...LOC 1959Z 282DEG 14KT 3951 10481 

$$

GIMMESTAD

Severe Thunderstorm Warnings in Colorado, 2021Every severe thunderstorm warning in 2021

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.