Area Forecast Discussion
Issued by NWS Grand Junction, CO

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

FXUS65 KGJT 230451

Area Forecast Discussion
National Weather Service Grand Junction CO
1051 PM MDT SUN MAY 22 2016

.SHORT TERM...(This evening through Monday night)
Issued at 400 PM MDT Sun May 22 2016

H5 hand analysis at 12z had a dominant ridge over the central
CONUS with low pressure systems along both right and left coastal
states. Our CWA is squeezed between the ridge and west coast low
leaving moderately fast southwest flow aloft. So far cloud cover
is keeping much of the winds at bay in the valleys...but at
ridge tops and near showers gusty winds will continue into the
evening. Expect showers to quickly die off after sunset with loss
of heating and under subsidence behind a passing wave. Downstream
blocking over the eastern states over the next 24 to 36 hours
leaves low pressure over the northern rockies and intermountain
west. This leaves southwest flow in place across the region with
little moisture advection. The 1.5 PVU progs suggest another wave
passing through Monday afternoon during peak heating and will lead
to another round of convection over the higher terrain over the
northern mountains. Temperatures will be slightly warmer on Monday
but stay below normal for this time of May.

.LONG TERM...(Tuesday through Sunday)
Issued at 400 PM MDT Sun May 22 2016

The downstream block will gradually break down by mid week and the
western trough will be allowed to traverse across the Rockies
Thursday. Wednesday will be a mirror of Tuesday with only isolated
afternoon convection anticipated in the afternoon. The passage of
the trough will bring an uptick to the convection Thursday which
will linger into Friday with cooler temperatures aloft aiding in
afternoon instability in northerly flow aloft. The next Pacific
system drops into the west Saturday and southerly flow return to
our CWA going into next weekend. At this time winds seem more of a
concern than precipitation. Temperatures remain below normal.


.AVIATION...(For the 06Z TAFS through 06Z Monday night)
Issued at 1043 PM MDT Sun May 22 2016

A weak cold front will continue to move slowly east out of the
forecast area tonight with winds diminishing overnight. Weaker
flow will return on Monday...however...breezy gusts are expected
at all TAF sites by the afternoon hours. Residual moisture and
instability will allow scattered afternoon showers and isolated
thunderstorms north of I-70 before diminishing by early evening.
This shower activity is not expected to impact airport operations.


.GJT Watches/Warnings/Advisories...


AVIATION...MPM is the U.S. government's official web portal to all federal, state and local government web resources and services.