Alert archive / Colorado / Flash Flood Warnings in 2017

Flash Flood Warning 11, NWS Grand Junction, CO

August 5, 2017Garfield County, Colorado

NWS Grand Junction, CO issued this flash flood warning at Aug 5, 2017, 5:50 PM MDT for Garfield County, Colorado. 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 5, 2017, 5:50 PM MDT (23:50 UTC)
Expired: Aug 5, 2017, 8:45 PM MDT
In force: 3 hr
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Flood severity: None

County Garfield County, CO

The radar

The Grand Junction radar (KGJX), 65 km from the middle of the area, began a volume at 23:50 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.

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 5, 5:49 PM MDT, 1 minute earlier.

Area forecast discussion, Aug 5, 5:49 PM MDT, 1 minute before

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Hazardous weather outlook, Aug 5, 5:34 AM MDT, 12 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service GRAND JUNCTION CO
534 AM MDT Sat Aug 5 2017

COZ001>014-017>023-UTZ022>025-027>029-061200-
Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-
Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide-
Northwest San Juan Mountains-Southwest San Juan Mountains-
Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
534 AM MDT Sat Aug 5 2017

This hazardous weather outlook is for eastern Utah and western
Colorado.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms are expected today and
tonight across eastern Utah and western Colorado. Locally heavy
rain, small hail and gusty winds to 40 mph are all possible with
the strongest storms.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Isolated to scattered showers and thunderstorms are expected each
day next week with gusty outflow winds, small hail and heavy rain
possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected today or tonight, however
spotters are encouraged to relay rainfall amounts or any observed
flooding to the National Weather Service in Grand Junction.

In the hours before

Special weather statement, Aug 5, 3:36 PM MDT, 2 hours 14 minutes before

Special Weather Statement
National Weather Service Grand Junction CO
336 PM MDT SAT AUG 5 2017

COZ003-007-013-052215-
Roan and Tavaputs Plateaus CO-Debeque to Silt Corridor CO-
Flattops CO-
336 PM MDT SAT AUG 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GARFIELD COUNTY UNTIL 415
PM MDT...

At 335 PM MDT, Doppler radar was tracking a strong thunderstorm 16
miles northwest of Rifle, or 34 miles northwest of Glenwood Springs,
moving southeast at 10 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Rio Blanco.

This includes Colorado 13 between mile markers 6 and 26.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3969 10806 3985 10796 3978 10766 3954 10782
TIME...MOT...LOC 2135Z 297DEG 7KT 3974 10793

NL

Special weather statement, Aug 5, 3:47 PM MDT, 2 hours 3 minutes before

Special Weather Statement
National Weather Service Grand Junction CO
347 PM MDT SAT AUG 5 2017

COZ002-003-013-052215-
Roan and Tavaputs Plateaus CO-Flattops CO-
Central Yampa River Basin CO-
347 PM MDT SAT AUG 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL RIO BLANCO COUNTY
UNTIL 415 PM MDT...

At 346 PM MDT, Doppler radar was tracking a strong thunderstorm 19
miles southwest of Meeker, or 43 miles northwest of Glenwood Springs,
moving northeast at 25 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

This storm will remain over mainly rural areas of south central Rio
Blanco County.

This includes Colorado 13 between mile markers 23 and 33.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3974 10810 3981 10816 3999 10792 3993 10784
      3985 10780
TIME...MOT...LOC 2146Z 236DEG 24KT 3981 10808

Charnick

Special weather statement, Aug 5, 4:08 PM MDT, 1 hour 42 minutes before

Special Weather Statement
National Weather Service Grand Junction CO
408 PM MDT SAT AUG 5 2017

COZ019>021-052300-
Southwest San Juan Mountains CO-
Paradox Valley/Lower Dolores River CO-
Four Corners/Upper Dolores River CO-
408 PM MDT SAT AUG 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DOLORES AND WEST
CENTRAL SAN MIGUEL COUNTIES UNTIL 500 PM MDT...

At 408 PM MDT, Doppler radar was tracking a strong thunderstorm over
Dove Creek, or 26 miles east of Monticello, moving north at 10 mph.

Frequent cloud to ground lightning, dime sizehail and winds in excess
of 40 mph will be possible with this storm.

Locations impacted include...
Dove Creek and Egnar.

This includes the following highways...
 U.S. Highway 491 in Colorado between mile markers 53 and 66.
 Colorado 141 between mile markers 1 and 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3767 10876 3769 10898 3795 10900 3792 10866
TIME...MOT...LOC 2208Z 186DEG 7KT 3776 10886

NL

Special weather statement, Aug 5, 4:30 PM MDT, 1 hour 20 minutes before

Special Weather Statement
National Weather Service Grand Junction CO
430 PM MDT SAT AUG 5 2017

COZ001-003-UTZ025-052315-
Roan and Tavaputs Plateaus CO-Lower Yampa River Basin CO-
Tavaputs Plateau UT-
430 PM MDT SAT AUG 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN RIO BLANCO COUNTY
UNTIL 515 PM MDT...

At 429 PM MDT, Doppler radar was tracking a strong thunderstorm 28
miles southwest of Rangely, or 53 miles northwest of Grand Junction,
moving southeast at 15 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

This storm will remain over mainly rural areas of southwestern Rio
Blanco County.

This includes Colorado 139 between mile markers 40 and 43.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3973 10921 3985 10907 3965 10869 3965 10912
TIME...MOT...LOC 2229Z 307DEG 13KT 3975 10908

15

Local storm report, Aug 5, 4:42 PM MDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
442 PM MDT SAT AUG 5 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0433 PM     DEBRIS FLOW      6 N RIFLE               39.62N 107.76W
08/05/2017                   GARFIELD           CO   DEPT OF HIGHWAYS

            CO HIGHWAY 325 CLOSED IN RIFLE GAP DUE TO A
            MUDSLIDE AND FLOODING.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 3:36 PM MDT	Special Weather Statement	GJT	Garfield	39 min
Aug 5, 3:47 PM MDT	Special Weather Statement	GJT	Rio Blanco	28 min
Aug 5, 3:50 PM MDT	Areal Flood Advisory	GJT	Rio Blanco	3 hr
Aug 5, 4:08 PM MDT	Special Weather Statement	GJT	Dolores	52 min
Aug 5, 4:30 PM MDT	Special Weather Statement	GJT		45 min
Aug 5, 5:20 PM MDT	Severe Thunderstorm Warning	GJT	Garfield, Rio Blanco	25 min
Aug 5, 5:40 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	31 min

Nearby

Flash Flood Warnings in Colorado, 2017 Every flash flood warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.