Alert archive / Colorado / Winter Storm Warnings in 2018
Winter Storm Warning 9, NWS Grand Junction, CO
NWS Grand Junction, CO issued this winter storm warning at Apr 19, 2018, 9:24 AM MDT for 14 counties in Colorado. It took effect at Apr 19, 2018, 9:00 PM MDT. It was in force for 21 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 19, 2018, 9:24 AM MDT (15:24 UTC)
- In effect from
- Apr 19, 2018, 9:00 PM MDT
- Expired
- Apr 20, 2018, 6:09 PM MDT
- In force
- 21 hr
- Issued by
- NWS Grand Junction, CO
Counties Archuleta County, CO, Delta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Pitkin County, CO, San Juan County, CO, San Miguel County, CO
The radar
The Grand Junction radar (KGJX), 99 km from the middle of the area, began a volume at 15:25 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, 3.4 hours before the alert went out and 119 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
- 3409 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 306 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before this winter storm warning went out at Apr 19, 3:14 AM MDT, 6 hours 10 minutes earlier.
Area forecast discussion, Apr 19, 3:14 AM MDT, 6 hours 10 minutes before
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</html>The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 9:24 AM MDT | Winter Weather Advisory | GJT | Delta, Eagle, Garfield, Gunnison, Hinsdale, Mesa and 7 more | 43 hr |
Nearby
Winter Storm Warnings in Colorado, 2018Every winter storm warning 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.