Alert archive / Colorado / Special Weather Statements in 2021
Special Weather Statement, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this special weather statement at Aug 6, 2021, 7:36 PM MDT for Larimer County, Colorado. It was in force for 24 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
- Aug 6, 2021, 7:36 PM MDT (01:36 UTC)
- Expired
- Aug 6, 2021, 8:00 PM MDT
- In force
- 24 min
- Issued by
- NWS Denver/Boulder, CO
- Hail
- 0.00 in
- Wind
- 40
County Larimer County, CO
The radar
The Cheyenne radar (KCYS), 54 km from the middle of the area, began a volume at 01:40 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 00:00Z, 1.6 hours before the alert went out and 178 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.
- Mixed-layer CAPE
- 4 J/kg
- Mixed-layer CIN
- -256 J/kg
- Mixed-layer LCL
- 3329 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -32 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
244
WWUS85 KBOU 070136
SPSBOU
Special Weather Statement
National Weather Service Denver CO
736 PM MDT Fri Aug 6 2021
COZ035-038-070200-
Larimer and Boulder Counties Between 6000 and 9000 Feet CO-
Larimer County Below 6000 Feet/Northwest Weld County CO-
736 PM MDT Fri Aug 6 2021
...Strong thunderstorms will impact portions of northwestern Weld and
northeastern Larimer Counties through 800 PM MDT...
At 735 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles north of Wellington to 5 miles
southwest of Buckhorn Mountain, or along a line extending from 27
miles southwest of Cheyenne to 16 miles west of Fort Collins.
Movement was east at 35 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Fort Collins, Windsor, Wellington, Timnath, Nunn, Carr, Livermore,
Stove Prairie, Mishawaka, Teds Place, Bellvue, Rockport, Poudre Park
and Buckhorn Mountain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4093 10464 4058 10487 4058 10494 4047 10495
4055 10546 4056 10547 4096 10522
TIME...MOT...LOC 0135Z 276DEG 30KT 4081 10506 4053 10537
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
$$
SCHLATTERThe 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, 7:58 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, 1:48 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 42 min |
| Aug 7, 2:29 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 33 min |
Nearby
Special Weather Statements in Colorado, 2021Every special weather statement 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.