Area Forecast Discussion
Issued by NWS Goodland, KS

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000
FXUS63 KGLD 261459
AFDGLD

Area Forecast Discussion
National Weather Service Goodland KS
859 AM MDT Sun Mar 26 2017

.UPDATE...
Issued at 859 AM MDT Sun Mar 26 2017

Across the Tri State region this morning...the area remains under
a blanket of low clouds along with extensive fog coverage in many
locales...as a shortwave and associated surface features continues
to move eastward from SE Colorado and into the southern
Kansas/western Oklahoma region. Radar is continuing to show light
shower activity at this time as temps remain fairly steady across
the area in the upper 30s to lower 40s. With fog still in
place...especially for central and western zones...will continue
Dense Fog Advisory going thru its midday expiration. May extend in
parts should it persist past 18z. Some breaks are showing up in
the veil of clouds currently over the area...which may create some
instability due to daytime heating so will continue mention of
isolated thunder/showers for remainder of today. No other changes
at this time.

&&

.SHORT TERM...(Today through Tuesday night)
Issued at 341 AM MDT Sun Mar 26 2017

Forecast concern will be fog and regular precipitation chances
through the period. Satellite showing a somewhat amplified but still
progressive wave train from the Pacific into North America. The flow
remains split over the central portion of the country with the
previous system moving slowly away and next, compact and rather
potent, system moving in from the four corners region.

Analysis shows near 100 meter height falls, rather cold air aloft,
and strong Pv anomaly with this system However, satellite and upper
air analysis is showing a lot of dry through mid levels in advance
of it. Models started well at mid levels in this complicated/active
pattern with the Canadian, Nam, and Ecmwf doing slightly better.
Models tended to start out too cool on the low level thermal field
with the Gfs and Canadian doing a little better.

For Today/tonight...Again initial issue will be the extent and
density of the fog. Most model output started out too low with
dewpoints. Fog and stratus is progressing east. However, it is
moving in a little slower. Guidance is still bringing in fog over
most of the area and based on latest trends that looks good. So will
areas of fog through mid morning.

Models are in much better agreement about compact/potent low
pressure system that will move across southeast Colorado and
southern Kansas through this evening. This patch plus moisture,
lift, and instability forecasts support most of the south/southwest
half of the area light measurable rainfall. South of the interstate
should see the highest amounts. Theta-e lapse rates supports keeping
embedded thunderstorms within the rain showers. This system and
associated should move out of the area by late this evening.

There is more agreement about the fog tonight. Because of this,
moist ground/air mass, and light wind field, I chose to add patchy
fog across the entire area during the overnight hours.

As the result of the cloud cover, precipitation, and upslope winds,
lowered the high temperatures especially in the southern half.

For Monday/Monday night...Patchy fog will end by late morning. After
that expect a decent amount of sun to occur. Due to light and
variable winds/lack of mixing due to the surface ridge moving
across, chose to lower the high temperatures a few degrees.

Conditions remain dry through the evening. However, beginning after
midnight, a prolonged wet period will begin. Next upper system moves
to just west of the area by late in the night, and will start
pulling in a warmer and more moist airmass. Right rear quadrant may
also affect the far north and northwest half of the area in the
latter half of the night. Kept what the builder gave me which is a
slight chance to chance of rain.

For Tuesday/Tuesday night...Upper system moves little and will
remain to our west and southwest. This will continue to allow a deep
moist air mass to get pulled into the area. Precipitable water
values will be near 0.75 inches which is near 3 standard deviations
above normal. Large scale mid and upper level lift will bring
widespread rain to the area. Occasional more intense periods will
occur when the stronger mesoscale lift moves across but that will be
hard to time. For the day, conditions will be unfavorable for
temperatures to warm. So I lowered high temperatures from what the
builder gave me.

.LONG TERM...(Wednesday through Saturday)
Issued at 206 AM MDT Sun Mar 26 2017

Wednesday and Thursday: Much better model agreement compared to
yesterday at this time with regards to a cut off low that will
traverse the region to our south. The low remains nearly stacked
from H5 to H7 with an axis of instability stretching from southeast
to northwest ahead of it. Ongoing widespread showers and maybe a
thunderstorm or two are expected through the day on Wednesday, into
Wednesday night and into Thursday. We could see a brief change over
to snow in the eastern Colorado counties before changing back to
rain after sunrise on Thursday. Overall, light to moderate showers
will prevail both days with initial QPF amounts near to just over
one inch, especially in areas south if Interstate 70. PW in the
region will be in the 0.70in to 0.80in range with fully saturated
profiles both days. Winds with this system will become gusty mainly
on Wednesday with the better chances of 30 plus mph wind gusts
remaining in the southwestern portions of the CWA. Temperatures will
reach the lower 50s on Wednesday with upper 50s expected Thursday.
Lows will fall into the lower to middle 30s.

Friday through Sunday: Dry weather is expected Friday in the wake of
the Wed/Thurs system. Shortwave ridging, albeit short lived, will
prevail through the day as another system approaches from the west.
This next system will bring another chance of rain to the region on
Saturday and Sunday; however, it will be located a bit further
southwest than the last system with much lower rainfall totals
expected. Highs Friday and Saturday will be near to slightly above
average with widespread upper 50s to lower 60s expected. Lows will
fall into the middle to upper 30s.

&&

.AVIATION...(For the 12Z TAFS through 12Z Monday morning)
Issued at 544 AM MDT Sun Mar 26 2017

For Kgld...Lifr conditions are expected until 17z when conditions
improve ifr. At 19z mvfr conditions are expected until 00z. Also
during this time there will be light rain showers affecting the
area along with isolated thunderstorms. Due to the isolated nature
and uncertainty with location of development, chose to put Vcts in
the forecast. Vfr conditions return at 00z and continue until
through the rest of the period. However, patchy fog is expected
after 06z. Due to it being the last six hours of the forecast,
chose to only reduce the visibility to 6sm. However, mvfr will be
possible.

For Kmck...Lifr conditions are expected through 17z. At that time,
mvfr conditions are expected, and then quickly transition to vfr a
couple hours after this. Vfr conditions will continue until 07z.
At that time mvfr conditions will develop and continue through the
end of the period.


&&

.GLD WATCHES/WARNINGS/ADVISORIES...
KS...Dense Fog Advisory until noon MDT /1 PM CDT/ today for
     KSZ001>004-013>016-027>029-041-042.

CO...Dense Fog Advisory until noon MDT today for COZ090>092.

NE...Dense Fog Advisory until noon MDT /1 PM CDT/ today for
     NEZ079>081.

&&

$$

UPDATE...JN
SHORT TERM...BULLER
LONG TERM...TL
AVIATION...BULLER



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