Alert archive / Colorado / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 1, NWS Grand Junction, CO

May 7, 2017Moffat County, Rio Blanco County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at May 7, 2017, 2:17 PM MDT for Moffat County, Rio Blanco County, Colorado. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 7, 2017, 2:17 PM MDT (20:17 UTC)
Expired: May 7, 2017, 2:45 PM MDT
In force: 28 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Moffat County, CO, Rio Blanco County, CO

The radar

The Grand Junction radar (KGJX), 138 km from the middle of the area, began a volume at 20:18 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 severe thunderstorm 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 severe thunderstorm warning went out at May 7, 11:21 AM MDT, 2 hours 56 minutes earlier.

Area forecast discussion, May 7, 11:21 AM MDT, 2 hours 56 minutes before

Area Forecast Discussion
National Weather Service GRAND JUNCTION CO
1121 AM MDT Sun May 7 2017

.SHORT TERM...(Today through Monday)
Issued at 238 AM MDT Sun May 7 2017

The strong closed low near San Diego will meander over southern CA
today and eventually move south to the northern Baja peninsula
tonight. A strong ridge will remain over the midwest. This
configuration places western CO and eastern UT beneath and area of
moderate divergence aloft within a moist southerly flow. The
uplift and precipitation production seen Saturday was enhanced by
a weak shortwave riding north across the area which will exit to
the north this morning. An area of subsidence behind this
shortwave will suppress convective development a bit this
afternoon, heating should overcome the convective inhibition and
enough instability and upper support remain for convective
redevelopment, especially over SW CO and SE UT, causing scattered
showers and a few thunderstorms this afternoon.

On Monday the old cold front wrapping around the low pressure
system, far from the low center, will rotate over SE UT and SW CO
Monday morning and afternoon, but makes little progress to the
east and north and as the upper low wobbles over southern AZ.

.LONG TERM...(Monday night through Sunday)
Issued at 345 PM MDT Sat May 6 2017

Monday night ought to remain cloudy but relatively dry as most of
the precipitation slides east of the area and the AZ storms dry
slot rest of the forecast area. On Tuesday the upper low center
will still reside over AZ, but the cold front will rotate north
and over the forecast area. This will bring the best day for
precipitation. Wednesday the low finally begins to fill and slide
north and east over CO and NM. By Thursday morning the upper low
center should be over SE CO and western Kansas, with plenty of
moisture and precipitation wrapping around the low and covering
much of western CO.

Thursday evening the moisture and precipitation will be pulling
out of the area with a ridge and drying conditions spreading over
eastern UT. Friday through Saturday, dry ridging should be in
place. As the ridge line passes east of the area, southwest flow
ahead of the next Pacific system along with drier air will spread
over the area.

&&

.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
Issued at 1112 AM MDT Sun May 7 2017

Relatively moist southerly flow continues to move through the
area. The atmosphere will become unstable this afternoon
supporting showers and thunderstorms into the evening hours.
Expect gusty winds, hail and frequent lightning will accompany
these storms.

&&

.GJT WATCHES/WARNINGS/ADVISORIES...
CO...None.
UT...None.
&&

SHORT TERM...CJC
LONG TERM....CJC
AVIATION...Larry

Hazardous weather outlook, May 7, 2:37 AM MDT, 11 hours 40 minutes before

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In the hours before

Special weather statement, May 7, 1:19 PM MDT, 58 minutes before

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Special weather statement, May 7, 1:23 PM MDT, 54 minutes before

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Special weather statement, May 7, 1:54 PM MDT, 23 minutes before

Special Weather Statement
National Weather Service Grand Junction CO
154 PM MDT SUN MAY 7 2017

COZ006-017-072045-
Uncompahgre Plateau/Dallas Divide CO-Grand Valley CO-
154 PM MDT SUN MAY 7 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MESA COUNTY UNTIL
245 PM MDT...

At 154 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles southwest of Grand Junction, moving north at 30 mph.

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

Locations impacted include...
Grand Junction, Fruita, Redlands, Glade Park and Orchard Mesa.

This includes the following highways...
 Interstate 70 in Colorado between mile markers 16  and 30 .
 U.S. Highway 50 in Colorado between mile markers 32  and 33 .

LAT...LON 3888 10858 3887 10868 3916 10884 3922 10870
      3918 10854
TIME...MOT...LOC 1954Z 170DEG 25KT 3894 10864

Charnick

Local storm report, May 7, 2:03 PM MDT, 14 minutes before

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Local storm report, May 7, 2:04 PM MDT, 13 minutes before

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Special weather statement, May 7, 2:05 PM MDT, 12 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
May 6, 6:14 PM MDT	Special Weather Statement	GJT	Mesa	46 min
May 6, 7:02 PM MDT	Special Weather Statement	GJT	Delta	43 min
May 7, 1:19 PM MDT	Special Weather Statement	GJT	Garfield	41 min
May 7, 1:23 PM MDT	Special Weather Statement	GJT	Mesa	52 min
May 7, 1:54 PM MDT	Special Weather Statement	GJT	Mesa	51 min
May 7, 2:05 PM MDT	Special Weather Statement	GJT		25 min
May 7, 3:09 PM MDT	Special Weather Statement	GJT		36 min
May 7, 3:41 PM MDT	Special Weather Statement	GJT	Mesa	34 min
May 7, 3:11 PM MDT	Special Weather Statement	GJT	Grand	49 min
May 7, 4:38 PM MDT	Special Weather Statement	GJT	Uintah	52 min
May 7, 4:40 PM MDT	Special Weather Statement	GJT	Uintah	50 min
May 7, 5:37 PM MDT	Special Weather Statement	GJT	Uintah	38 min
May 7, 5:47 PM MDT	Severe Thunderstorm Warning	GJT	Uintah	28 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2017 Every severe thunderstorm 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.