Alert archive / Colorado / Winter Storm Watches in 2018
Winter Storm Watch 9, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm watch at Dec 25, 2018, 4:53 AM MST for 6 counties in Colorado. It took effect at Dec 26, 2018, 5:00 PM MST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 25, 2018, 4:53 AM MST (11:53 UTC)
- In effect from
- Dec 26, 2018, 5:00 PM MST
- Expired
- Dec 26, 2018, 4:21 AM MST
- In force
- Issued by
- NWS Denver/Boulder, CO
Counties Elbert County, CO, Lincoln County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 126 km from the middle of the area, began a volume at 11:54 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 (KDEN), launched 00:00Z, 11.9 hours before the alert went out and 25 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
- 7 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 2208 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
Nearby
Winter Storm Watches in Colorado, 2018Every winter storm watch in 2018
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.