Area Forecast Discussion
Issued by NWS Grand Junction, CO

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FXUS65 KGJT 150924

Area Forecast Discussion
National Weather Service GRAND JUNCTION CO
324 AM MDT Sun Oct 15 2017

.SHORT TERM...(Today through Monday)
Issued at 311 AM MDT Sun Oct 15 2017

Cooler air is in place today following yesterday`s cold frontal
passage. Low temperatures this morning will be significantly below
normal and growing season-ending freezes area expected in the
Grand Valley, Utah`s Grand Flat and the Canyonlands and Bridges
N.P. area. High temperatures will run 10 to 15 degrees cooler
than on Saturday. Monday morning should be another cold morning,
but the gradual warming trend will initiate.

.LONG TERM...(Monday night through Saturday)
Issued at 311 AM MDT Sun Oct 15 2017

The jet stream will relocate back near the Canadian/US border
behind this retreating system. This will allow a broad ridge to
expand across the Intermountain West early in the upcoming week.
The westerlies then will then dip south of the border...pushing
the high southward and leaving zonal flow in place across much of
the CONUS going into the late week period. This should mean mainly
clear/sunny conditions with temperatures running slightly above
normal. Interesting things begin to occur in the E.Pac during this
same period as the polar jet begins to dig off the Left Coast.
Currently on the 00Z H500 map there is a cut-off spinning near
30N/140W. The digging trough will pick up this low pressure system
and the resultant phased trough will move into the Western States
by late Friday. Expect gusty and warm conditions Friday. With the
absorption of the southern low subtropical moisture will be
entrained into the system. As the trough moves into Great Basin
and Central Rockies by next weekend wetter conditions appear to be
on the horizon. Models in the far term are actually handling the
phasing of the above trough going into next weekend and the
outcomes are out of phase themselves. So beyond Friday confidence
very low.


.AVIATION...(For the 12Z TAFS through 12Z Monday morning)
Issued at 311 AM MDT Sun Oct 15 2017

VFR conditions will prevail across the area under nearly cloudless


CO...Freeze Warning until 9 AM MDT this morning for COZ006.

UT...Freeze Warning until 9 AM MDT this morning for UTZ027-029.



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