Alert archive / Colorado / Winter Storm Watches in 2020
Winter Storm Watch 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm watch at Feb 4, 2020, 2:51 PM MST for 9 counties in Colorado. It took effect at Feb 6, 2020, 12:00 AM MST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 4, 2020, 2:51 PM MST (21:51 UTC)
- In effect from
- Feb 6, 2020, 12:00 AM MST
- Expired
- Feb 5, 2020, 2:07 AM MST
- In force
- Issued by
- NWS Denver/Boulder, CO
Counties Boulder County, CO, Clear Creek County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO
The radar
The Denver radar (KFTG), 102 km from the middle of the area, began a volume at 21:52 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
Riverton, WY (KRIW), launched 12:00Z, 9.9 hours before the alert went out and 414 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
- 677 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before this winter storm watch went out at Feb 4, 10:48 AM MST, 4 hours 3 minutes earlier.
Area forecast discussion, Feb 4, 10:48 AM MST, 4 hours 3 minutes before
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</html>Hazardous weather outlook, Feb 4, 10:58 AM MST, 3 hours 53 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1058 AM MST Tue Feb 4 2020 COZ030>051-051800- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1058 AM MST Tue Feb 4 2020 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Light snow will diminish this afternoon and end by early evening. Additional snowfall will be under half of an inch. It will be a cold day, with wind chills in the single digits most of the day. Lows will drop below zero across most locations tonight. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A strong and very moist northwestly flow aloft will bring a period of heavy snow to the mountains late day Wednesday through early Saturday. The snowfall is expected to pile up in the high mountains on Thursday and Friday, heaviest along northwest facing slopes. There will be a good chance of snow over the plains Thursday night and Friday as well, with localized bands of heavier snowfall possible. Temperatures will be below normal through Friday with slightly warmer readings for the weekend. Another storm system could bring snow the mountain areas on Sunday with a slight chance of snow spreading into the northeast plains of Colorado by Monday. .SPOTTER INFORMATION STATEMENT... Snowfall reports from spotters will be appreciated.
In the hours before
Local storm report, Feb 4, 8:51 AM MST, 6 hours before
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</html>Local storm report, Feb 4, 9:10 AM MST, 5 hours 41 minutes before
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</html>Local storm report, Feb 4, 10:41 AM MST, 4 hours 10 minutes before
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</html>Local storm report, Feb 4, 11:58 AM MST, 2 hours 53 minutes before
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</html>Local storm report, Feb 4, 2:48 PM MST, 3 minutes before
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</html>Nearby
Winter Storm Watches in Colorado, 2020Every winter storm watch in 2020
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.