Alert archive / Utah / Flash Flood Warnings in 2015

Flash Flood Warning 14, NWS Grand Junction, CO

August 2, 2015San Juan County, Utah

NWS Grand Junction, CO issued this flash flood warning at Aug 2, 2015, 7:25 PM MDT for San Juan County, Utah. It was in force for 3 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: Aug 2, 2015, 7:25 PM MDT (01:25 UTC)
Expired: Aug 2, 2015, 10:15 PM MDT
In force: 3 hr
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Flood severity: None

County San Juan County, UT

The radar

The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 01:28 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 00:00Z, 1.4 hours before the alert went out and 321 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: 77 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1795 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -53 m²/s²
0-3 km storm-relative helicity: -22 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 flash flood 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 flash flood warning went out at Aug 2, 6:41 PM MDT, 44 minutes earlier.

Area forecast discussion, Aug 2, 6:41 PM MDT, 44 minutes before

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Hazardous weather outlook, Aug 2, 5:43 AM MDT, 13 hours 42 minutes before

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In the hours before

Special weather statement, Aug 2, 4:56 PM MDT, 2 hours 29 minutes before

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Local storm report, Aug 2, 5:22 PM MDT, 2 hours 3 minutes before

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Local storm report, Aug 2, 5:38 PM MDT, 1 hour 47 minutes before

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Local storm report, Aug 2, 5:51 PM MDT, 1 hour 34 minutes before

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Special weather statement, Aug 2, 6:17 PM MDT, 1 hour 8 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
Aug 2, 6:17 PM MDT	Special Weather Statement	GJT	Garfield	43 min
Aug 2, 7:38 PM MDT	Special Weather Statement	GJT	Moffat	52 min
Aug 3, 2:16 PM MDT	Special Weather Statement	GJT	Pitkin	29 min
Aug 3, 4:45 PM MDT	Special Weather Statement	GJT	Dolores	30 min
Aug 3, 5:41 PM MDT	Flash Flood Warning	GJT	Dolores, San Miguel	2 hr
Aug 3, 5:59 PM MDT	Areal Flood Advisory	GJT	Dolores	3 hr

Nearby

Flash Flood Warnings in Utah, 2015 Every flash flood warning 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.