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, 6:15 PM MDT for Logan County, Colorado. It was in force for 45 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, 6:15 PM MDT (00:15 UTC)
- Expired
- Aug 6, 2021, 7:00 PM MDT
- In force
- 45 min
- Issued by
- NWS Denver/Boulder, CO
- Hail
- 0.25 in
- Wind
- 50
County Logan County, CO
The radar
The Cheyenne radar (KCYS), 166 km from the middle of the area, began a volume at 00:18 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, 0.3 hours before the alert went out and 97 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.
255
WWUS85 KBOU 070015
SPSBOU
Special Weather Statement
National Weather Service Denver CO
615 PM MDT Fri Aug 6 2021
COZ048-070100-
Logan County CO-
615 PM MDT Fri Aug 6 2021
...Strong thunderstorms will impact portions of Logan County through
700 PM MDT...
At 614 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 3 miles north of North Sterling Reservoir to 7
miles north of Burdett, or along a line extending from 26 miles
southwest of Sidney to 14 miles southeast of Sterling. Movement was
east at 25 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...
Sterling, Fleming, Iliff, Peetz, Crook, St Petersburg, Proctor,
Padroni, Twin Buttes and North Sterling Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4070 10266 4049 10266 4044 10293 4044 10307
4088 10339 4100 10327 4100 10272
TIME...MOT...LOC 0014Z 260DEG 22KT 4084 10329 4048 10300
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, 6:24 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, 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.