Area Forecast Discussion
Issued by NWS Pueblo, CO

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FXUS65 KPUB 201754

Area Forecast Discussion
National Weather Service Pueblo CO
1154 AM MDT Thu Apr 20 2017

.SHORT TERM...(Today and tonight)
Issued at 410 AM MDT Thu Apr 20 2017

...Some snow for the mtns...showers on the plains...


A few light showers were noted over the east central plains of CO
were associated with a weak wave moving into KS. sctd/bkn mid lvl
cloudiness was noted over the plains with a few clouds noted over
the higher trrn. Sfc flow has transitioned to northeasterly as a
cool front moved across the plains late yday evening. Temps
generally N of US50 were in the  40s while 50s were noted S of US50.
DWPTs were starting to creep up with L40s entering the far e plains.

On the large scale, A weak mid lvl short wave ridge was moving into
W CO at this hour. Farther west, a trough of low pressure was moving
onshore of the CA coast.


Weak ridge will move over the region this morning. This will keep
dry weather over the fcst area. As the trough moves closer to the
region later today, Sfc pressure falls will develop over the plains
and this will enhance the upslope flow which in turn will bring
somewhat better llvl moisture into the region. Showers with some
thunder are expected to develop after 18Z over the higher trrn and
move east onto the plains late this afternoon.

Best parameter for convection will be over the mtns today as some
CAPE is noted, with values generally below 500 J/KG. Some shear is
noted with the upslope, however with CAPE values meager at best (we
will be lucky to see a 40 dwpt along the mtns/plains interface),
dont expect any strong thunder. Nonetheless we may see some heavier
rain over the burn scars over the Wets and Sangre de Cristo mtns.
Over the plains very little if any CAPE is expected to develop today
so thunder will be isolated at best.

In the mountains, especially in the central mtns, accumulating snow
will develop, mainly by late in the afternoon.


Best chance of precip along the I-25 corridor will be this evening
as best forcing moves over this area. Impressive warm air advection
is noted along along with upslope flow and mid lvl forcing. The best
chance of precip will be over the greater Pikes Peak (PP) region.
Locally heavy snow will be possible over the higher elevations of
the PP area.

Snow will continue over the central mountains through the nighttime
hours. A snow advisory has been issued over the central mountains
and the top of PP.

Given the storm track, drier westerly flow will start to move into
the southern sections of the fcst area, and any precip over the sw
mtns will decrease.

It will be cloudy over most of the region tonight with low cigs on
the plains. /Hodanish

.LONG TERM...(Friday through Wednesday)
Issued at 410 AM MDT Thu Apr 20 2017

Friday and Saturday...GFS, EC and NAM models are in fairly close
agreement on the movement and placement of the upper low over the
weekend. On Fri the low tracks across the northern and eastern
portions of Colorado, which is further north than previous
solutions. This will bring isolated to scattered showers to much of
the higher terrain and high valleys, though the central mts will
still see some significant snow accumulation through the first half
of Fri. The eastern plains, and particularly those areas near the
Kansas state line, will have the greatest chance of heavier showers
through the day Fri. By Fri night the upper low will have already
tracked east into Kansas, but a secondary piece of energy will drop
south across the state and help shower activity to linger over the
eastern mts late Fri night and through the day Sat. High temps both
days are forecast to be in the 50s for the lower elevations, and 30s
to lower 40s for the mts.

Sunday and Monday...Models have consistently indicated that
temporary ridging across the region on Sun will give way to a fast-
moving shortwave crossing the northern Rockies on Mon. This will
usher in warmer temps, with just some isolated pops across the
central mts Sun night and Mon. Max temps in the 70s for Sun will
give way to 70s to lower 80s on Mon.

Tuesday and Wednesday...Long range models show two more broader
disturbances approaching the region, one for Tue and another
stronger one for Wed. For the time being, these features look like
they will bring a greater chance for moisture to the higher terrain
on Tue, and perhaps to the entire forecast area for Wed. High temps
both days are expected to climb into the 60s and 70s for the plains
and high valleys. Moore


.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1142 AM MDT Thu Apr 20 2017

VFR cigs will be lowering into the MVFR to IFR category late this
afternoon and evening for KCOS and KPUB as -SHRA and isolated
-TSRA spread off the mountains into the I-25 corridor. This will
continue through 06-09z as rounds of showers move off the
mountains overnight. Conditions will improve to VFR for both
terminals towards 12z, though showers may briefly drop cigs into
the MVFR category again during the afternoon. Winds will remain
gusty from the southeast this afternoon with gusts to 25 kts at
times, winds will veer around from the east tonight, then
increase from the north by late friday morning with gusts to
around 25 kts through the afternoon.

KALS will remain VFR the majority of the next 24 hours though some
brief MVFR cigs will be possible with -SHRA this afternoon and
evening. Conditions will return to VFR overnight. Gusty southerly
winds will become light overnight, then shift out of the north on
Friday. -KT


Winter Weather Advisory from 6 PM this evening to 3 PM MDT
Friday for COZ058-060-082.



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