Alert archive / Colorado / Special Weather Statements in 2015

Special Weather Statement, NWS Grand Junction, CO

August 27, 2015La Plata County, Colorado

NWS Grand Junction, CO issued this special weather statement at Aug 27, 2015, 2:21 PM MDT for La Plata County, Colorado. It was in force for 39 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: Aug 27, 2015, 2:21 PM MDT (20:21 UTC)
Expired: Aug 27, 2015, 3:00 PM MDT
In force: 39 min
Issued by: NWS Grand Junction, CO

County La Plata County, CO

The radar

The Grand Junction radar (KGJX), 219 km from the middle of the area, began a volume at 20:23 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.4 hours before the alert went out and 428 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: 559 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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
Aug 27, 3:44 PM MDT	Special Weather Statement	GJT	Eagle	46 min
Aug 27, 4:39 PM MDT	Special Weather Statement	GJT	Garfield	36 min
Aug 27, 5:42 PM MDT	Special Weather Statement	GJT	Grand	48 min

Nearby

Special Weather Statements in Colorado, 2015 Every special weather statement in 2015

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.