Alert archive / Colorado / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 6, NWS Grand Junction, CO

June 21, 2017Mesa County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Jun 21, 2017, 5:29 PM MDT for Mesa County, Colorado. It was in force for 31 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: Jun 21, 2017, 5:29 PM MDT (23:29 UTC)
Expired: Jun 21, 2017, 6:00 PM MDT
In force: 31 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Mesa County, CO

The radar

The Grand Junction radar (KGJX), 22 km from the middle of the area, began a volume at 23:32 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 Jun 21, 3:34 PM MDT, 1 hour 55 minutes earlier.

Area forecast discussion, Jun 21, 3:34 PM MDT, 1 hour 55 minutes before

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Hazardous weather outlook, Jun 21, 3:02 AM MDT, 14 hours 27 minutes before

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In the hours before

Local storm report, Jun 21, 3:29 PM MDT, 2 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
329 PM MDT WED JUN 21 2017

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

0246 PM     TSTM WND GST     2 SW GREAT DIVIDE       40.76N 107.85W
06/21/2017  M54 MPH          MOFFAT             CO   MESONET

            MESONET STATION GDRC2, 2 SW GREAT DIVIDE.

&&

NL

Local storm report, Jun 21, 3:30 PM MDT, 1 hour 59 minutes before

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Special weather statement, Jun 21, 3:56 PM MDT, 1 hour 33 minutes before

Special Weather Statement
National Weather Service Grand Junction CO
356 PM MDT WED JUN 21 2017

COZ008-010-013-212245-
Central Colorado River Basin CO-Flattops CO-
Gore and Elk Mountains/Central Mountain Valleys CO-
356 PM MDT WED JUN 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN EAGLE AND
SOUTHEASTERN GARFIELD COUNTIES UNTIL 445 PM MDT...

At 355 PM MDT, Doppler radar was tracking a strong thunderstorm over
Glenwood Springs, moving east at 25 mph.

Wind gusts of 50 to 55 mph will be possible with this storm.

This storm will remain over mainly rural areas of southwestern Eagle
and southeastern Garfield Counties, including the following
locations: El Jebel, Emma, Shoshone and Cattle Creek.

This includes the following highways...
 Interstate 70 in Colorado between mile markers 114 and 130.
 Colorado 82 between mile markers 1 and mile marker 19.

LAT...LON 3947 10740 3965 10734 3959 10679 3933 10688
TIME...MOT...LOC 2155Z 284DEG 21KT 3955 10728

NL

Local storm report, Jun 21, 3:57 PM MDT, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
357 PM MDT WED JUN 21 2017

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

0349 PM     NON-TSTM WND GST 2 SE CRAIG              40.50N 107.52W
06/21/2017  M53 MPH          MOFFAT             CO   ASOS

            ASOS STATION CAG, CRAIG AIRPORT.

&&

NL

Local storm report, Jun 21, 4:34 PM MDT, 55 minutes before

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Local storm report, Jun 21, 4:59 PM MDT, 30 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
Jun 21, 1:14 PM MDT	Special Weather Statement	GJT	Dolores	46 min
Jun 21, 3:06 PM MDT	Special Weather Statement	GJT	Garfield	39 min
Jun 21, 3:56 PM MDT	Special Weather Statement	GJT	Pitkin	49 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.