Area Forecast Discussion
Issued by NWS Pueblo, CO

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FXUS65 KPUB 240546

Area Forecast Discussion
National Weather Service Pueblo CO
1146 PM MDT Fri Jun 23 2017

Issued at 739 PM MDT Fri Jun 23 2017

Updated sky cover for tonight and Saturday morning, and made
minor adjustments to the evening POPs based on current trends.


.SHORT TERM...(This evening through Saturday)
Issued at 314 PM MDT Fri Jun 23 2017

Currently, quite a bit of cloud cover in cool air across the
eastern mountains, I -25 corridor, and plains. With some sun this
afternoon temperatures have reached the mid to upper 60s across
the plains, but the temperatures range from the mid 50s to mid 60s
across the I- 25 corridor and adjacent high valleys. With mostly
sunny conditions in the western part of the area, temperatures are
well into the 70s in the San Luis Valley and mainly 50s and 60s
across the mountains.

Tonight, short term models still hinting at some isolated showers
and weak storms across the eastern higher terrain, so kept isolated
to low grade scattered pops in that area and immediate adjacent
terrain.  Issue will be with the extent of the cloud cover and
ceiling heights for aviation.  Model guidance is not suggesting any
widespread fog at this time, but cannot rule out some patchy fog,
especially in those areas where it rained a little more this morning.

Saturday, expecting it to be warmer, with some more sunshine across
eastern part of the CWA. Highs should reach the 70s across the
plains and I-25 corridor, and around 80 across the San Luis Valley.
Mountain highs will be in the 50s to lower 70s. GFS is much more
aggressive with the showers and storms in the afternoon, while
NAM more conservative. Given the instability values on both
models, would tend toward the NAM, with most instability across
the eastern mountains and adjacent terrain. Greatest instability
and shear across the southern Sangres/I-25 corridor which is in a
sliver of marginal risk for severe storms, which seems reasonable.

.LONG TERM...(Saturday night through Friday)
Issued at 314 PM MDT Fri Jun 23 2017

Saturday night through Monday...The ridge of high pressure over the
desert SW will keep northwest flow aloft across Colorado over the
weekend. Continued below normal temps and isolated to scattered
showers and thunderstorms across the higher terrain and eastern
plains are expected, as NE-E llvl flow feeds cooler air and moisture
back towards the southern Front Range. On Mon the ridge starts to
break down, with westerly downslope flow off the mts interrupting
the easterly upslope flow, resulting in slimmer pcpn chances and
warmer temps. Expect max temps in the mid 70s to lower 80s for Sun,
then in the 80s for most areas on Mon.

Tuesday through Friday...Westerly zonal flow settles in across the
region starting Tue, with the models now coming to some sort of
agreement on an upper low crossing Canada and the northern Rockies
Wed through Fri. At this point, it looks like this feature will be
too far north to affect Colorado save for an increase in the
westerly flow aloft. This will serve to heat temps up, and drop pcpn
chances to isolated at best, through the remainder of the work week.
Look for highs in the 80s for the high valleys, and in the 90s for
the eastern plains. Moore


.AVIATION...(For the 06Z TAFS through 06Z Saturday night)
Issued at 1138 PM MDT Fri Jun 23 2017

It appears that KPUB will continue to have a VFR ceiling through
early Sat morning and then there may be a break in the clouds
until about midafternoon, and then it looks like a BKN-OVC VFR
layer will again cover the area. KCOS is expected to have an OVC
layer of low clouds around 3000 ft and could at times be VFR,
otherwise will be MVFR. The low clouds may scattered out around
midmorning, but then in the early afternoon will likely become a
BKN-OVC layer again but probably in the VFR category. There could
be some showers in the area in the afternoon and evening hours.
Forecast soundings for KALS show an MVFR ceiling developing toward
morning and lasting a few hours, otherwise VFR conditions are




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