Alert archive / Colorado / Freeze Warnings in 2021

Freeze Warning 11, NWS Grand Junction, CO

October 13, 20218 counties in Colorado; Uintah County, Utah

NWS Grand Junction, CO issued this freeze warning at Oct 13, 2021, 3:28 PM MDT for 8 counties in Colorado; Uintah County, Utah. It took effect at Oct 13, 2021, 8:00 PM MDT. It was in force for 14 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: Oct 13, 2021, 3:28 PM MDT (21:28 UTC)
In effect from: Oct 13, 2021, 8:00 PM MDT
Expired: Oct 14, 2021, 10:00 AM MDT
In force: 14 hr
Issued by: NWS Grand Junction, CO

Counties Archuleta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, La Plata County, CO, Montezuma County, CO, Pitkin County, CO, San Miguel County, CO, Uintah County, UT

The radar

The Grand Junction radar (KGJX), 71 km from the middle of the area, began a volume at 21:27 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 9.5 hours before the alert went out and 426 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze 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 freeze warning went out at Oct 12, 5:49 PM MDT, 21 hours 39 minutes earlier.

Area forecast discussion, Oct 12, 5:49 PM MDT, 21 hours 39 minutes before

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The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 13, 3:28 PM MDT	Freeze Watch	GJT	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 6 more	13 hr

Nearby

Freeze Warnings in Colorado, 2021 Freeze Warnings in Utah, 2021 Every freeze 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.