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, 6:24 PM MDT for Jackson County, Colorado. It was in force for 36 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, 6:24 PM MDT (00:24 UTC)
- Expired
- Aug 6, 2021, 7:00 PM MDT
- In force
- 36 min
- Issued by
- NWS Denver/Boulder, CO
- Hail
- 0.25 in
- Wind
- 50
County Jackson County, CO
The radar
The Cheyenne radar (KCYS), 101 km from the middle of the area, began a volume at 00:24 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, 0.4 hours before the alert went out and 250 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.
699
WWUS85 KBOU 070024
SPSBOU
Special Weather Statement
National Weather Service Denver CO
624 PM MDT Fri Aug 6 2021
COZ030-033-035-070100-
Jackson County Below 9000 Feet CO-
Larimer and Boulder Counties Between 6000 and 9000 Feet CO-
South and East Jackson/Larimer/North and Northeast Grand/Northwest
Boulder Counties Above 9000 Feet CO-
624 PM MDT Fri Aug 6 2021
...Strong thunderstorms will impact portions of eastern Jackson and
northwestern Larimer Counties through 700 PM MDT...
At 623 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles east of Walden to 3 miles northwest of
Rand, or along a line extending from 42 miles southwest of Laramie
to 68 miles east of Craig. Movement was east at 40 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Walden, Rand, Cameron Pass, Four Corners, Brownlee, Gould, Chambers
Lake, Glendevey and Kinikinik.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4100 10559 4036 10590 4045 10642 4099 10622
4100 10576
TIME...MOT...LOC 0023Z 269DEG 43KT 4081 10607 4048 10624
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 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, 6:53 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, 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.