Alert archive / Colorado / Flash Flood Warnings in 2015

Flash Flood Warning 12, NWS Grand Junction, CO

July 8, 2015Mesa County, Colorado

NWS Grand Junction, CO issued this flash flood warning at Jul 8, 2015, 6:41 PM MDT for Mesa County, Colorado. It was in force for 2 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: Jul 8, 2015, 6:41 PM MDT (00:41 UTC)
Expired: Jul 8, 2015, 9:00 PM MDT
In force: 2 hr
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Flood severity: None

County Mesa County, CO

The radar

The Grand Junction radar (KGJX), 22 km from the middle of the area, began a volume at 00:41 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 00:00Z, 0.7 hours before the alert went out and 352 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: 21 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 2322 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 94 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 Jul 8, 4:35 PM MDT, 2 hours 6 minutes earlier.

Area forecast discussion, Jul 8, 4:35 PM MDT, 2 hours 6 minutes before

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Hazardous weather outlook, Jul 8, 5:45 AM MDT, 12 hours 56 minutes before

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In the hours before

Special weather statement, Jul 8, 5:47 PM MDT, 54 minutes before

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Special weather statement, Jul 8, 6:18 PM MDT, 23 minutes before

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Special weather statement, Jul 8, 6:24 PM MDT, 17 minutes before

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Local storm report, Jul 8, 6:28 PM MDT, 13 minutes before

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Local storm report, Jul 8, 6:31 PM MDT, 10 minutes before

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Special weather statement, Jul 8, 6:41 PM MDT, 0 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
Jul 8, 6:18 PM MDT	Special Weather Statement	GJT	Mesa	42 min
Jul 8, 6:41 PM MDT	Special Weather Statement	GJT	Mesa	49 min
Jul 8, 7:01 PM MDT	Areal Flood Advisory	GJT	Delta, Mesa	3 hr
Jul 8, 7:07 PM MDT	Severe Thunderstorm Warning	GJT	Delta, Mesa	23 min
Jul 9, 1:08 PM MDT	Special Weather Statement	GJT	Dolores	52 min
Jul 9, 2:25 PM MDT	Special Weather Statement	GJT	Mesa	50 min
Jul 9, 2:27 PM MDT	Special Weather Statement	GJT	Montrose	48 min
Jul 9, 2:40 PM MDT	Special Weather Statement	GJT		50 min
Jul 9, 2:57 PM MDT	Special Weather Statement	GJT	Ouray	33 min
Jul 9, 3:11 PM MDT	Special Weather Statement	GJT	Mesa	49 min
Jul 9, 3:21 PM MDT	Special Weather Statement	GJT		39 min
Jul 9, 4:14 PM MDT	Special Weather Statement	GJT		46 min
Jul 9, 4:30 PM MDT	Special Weather Statement	GJT	Mesa	45 min
Jul 9, 5:32 PM MDT	Areal Flood Advisory	GJT	Mesa	118 min
Jul 8, 6:24 PM MDT	Special Weather Statement	GJT	San Juan	36 min
Jul 9, 12:48 PM MDT	Special Weather Statement	GJT	Grand	42 min
Jul 9, 1:04 PM MDT	Special Weather Statement	GJT	Uintah	26 min
Jul 9, 1:31 PM MDT	Special Weather Statement	GJT	San Juan	44 min
Jul 9, 1:43 PM MDT	Special Weather Statement	GJT	Uintah	47 min
Jul 9, 1:48 PM MDT	Areal Flood Advisory	GJT	Uintah	3 hr
Jul 9, 1:54 PM MDT	Special Weather Statement	GJT	Uintah	51 min
Jul 9, 2:12 PM MDT	Special Weather Statement	GJT	San Juan	33 min
Jul 9, 2:21 PM MDT	Special Weather Statement	GJT	San Juan	39 min
Jul 9, 2:49 PM MDT	Special Weather Statement	GJT	Uintah	41 min
Jul 9, 3:47 PM MDT	Special Weather Statement	GJT	Grand	43 min
Jul 9, 4:08 PM MDT	Areal Flood Advisory	GJT	Grand	3 hr
Jul 9, 5:14 PM MDT	Special Weather Statement	GJT	Grand	46 min

Nearby

Flash Flood Warnings in Colorado, 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.