Alert archive / Colorado / Snow Squall Warnings in 2021
Snow Squall Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this snow squall warning at Dec 15, 2021, 6:03 AM MST for Summit County, Colorado. It was in force for 57 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
- Dec 15, 2021, 6:03 AM MST (13:03 UTC)
- Expired
- Dec 15, 2021, 7:00 AM MST
- In force
- 57 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Summit County, CO
The radar
The Denver radar (KFTG), 136 km from the middle of the area, began a volume at 13:03 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
Grand Junction, CO (KGJT), launched 12:00Z, 1.1 hours before the alert went out and 211 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 755 m above ground
- 0-6 km bulk shear
- 98 kt
- 0-1 km storm-relative helicity
- -252 m²/s²
- 0-3 km storm-relative helicity
- -57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
742
WWUS55 KBOU 151303
SQWBOU
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Denver CO
603 AM MST Wed Dec 15 2021
COC117-151400-
/O.NEW.KBOU.SQ.W.0002.211215T1303Z-211215T1400Z/
Summit CO-
603 AM MST Wed Dec 15 2021
The National Weather Service in Denver Colorado has issued a
* Snow Squall Warning for...
Southeastern Summit County in central Colorado...
* Until 700 AM MST.
* At 601 AM MST, a dangerous snow squall was located over Minturn,
or 48 miles east of Glenwood Springs, moving east at 25 mph. Heavy
snow and whiteout conditions will move into Summit county soon.
HAZARD...Whiteout conditions. Zero visibility in heavy snow.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
* This includes Interstate 70 between mile markers 192 and 213.
Locations impacted include...
Breckenridge, Silverthorne, Frisco, Dillon, Blue River, Keystone and
Copper Mountain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
&&
LAT...LON 3955 10620 3961 10620 3960 10619 3961 10618
3964 10618 3965 10620 3971 10620 3968 10595
3962 10580 3950 10589 3937 10604 3938 10621
TIME...MOT...LOC 1301Z 267DEG 23KT 3956 10642
$$
MEIER1 follow-up statement
499
WWUS55 KBOU 151342
SQWBOU
Snow Squall Warning
National Weather Service Denver CO
642 AM MST Wed Dec 15 2021
COC117-151400-
/O.CON.KBOU.SQ.W.0002.000000T0000Z-211215T1400Z/
Summit CO-
642 AM MST Wed Dec 15 2021
...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 700 AM MST FOR
SOUTHEASTERN SUMMIT COUNTY...
At 642 AM MST, a dangerous snow squall was located over Dillon, or
61 miles west of Denver, moving east at 25 mph.
HAZARD...Whiteout conditions. Zero visibility in heavy snow and
blowing snow. Wind gusts greater than 40 mph.
SOURCE...Radar and webcams.
IMPACT...Dangerous life-threatening travel.
This includes Interstate 70 between mile markers 192 and 213.
Locations impacted include...
Breckenridge, Silverthorne, Frisco, Dillon, Blue River, Keystone and
Copper Mountain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
&&
LAT...LON 3955 10620 3961 10620 3960 10619 3961 10618
3964 10618 3965 10620 3971 10620 3968 10595
3962 10580 3950 10589 3937 10604 3938 10621
TIME...MOT...LOC 1342Z 267DEG 23KT 3957 10608
$$
SCHLATTERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 6:49 AM MST | Snow Squall Warning | BOU | Clear Creek, Gilpin, Grand, Summit | 56 min |
| Dec 15, 7:47 AM MST | Special Weather Statement | BOU | Boulder, Broomfield, Denver, Jefferson | 43 min |
| Dec 15, 8:12 AM MST | Special Weather Statement | BOU | Douglas | 48 min |
Nearby
Snow Squall Warnings in Colorado, 2021Every snow squall 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.