Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 222122
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
322 PM MDT Tue May 22 2018

.SHORT TERM...(This evening through Wednesday)
Issued at 322 PM MDT Tue May 22 2018

Radar and satellite data show scattered showers and thunderstorms
moving over the central mountains from south to north. Another
single storm is tracking toward southern Lincoln County from the
south. Storms are moving at a fair clip, so the threat of heavy
rain is reduced. Should see activity increase for a few more hours
and then dissipate after the sun goes down. Shower activity could
develop out over the I-25 corridor, but the rest of the plains
should remain dry this evening. Storms could also become strongest
as they reach the northern Colorado border, where deeper moisture
and instability are present.

For tomorrow, the upper low over the Great Basin is forecast to be
lifting northeastward while southwesterly flow aloft continues
across Colorado. Moist south to southeast flow are expected to
persist across eastern Colorado while the mountains also remain
under moist flow. Another round of afternoon showers is expected,
both over the mountains and out on the plains, where Gulf moisture
will be getting advected into the region. Storm Prediction Center
indicates that the eastern border of Colorado will be under a
marginal threat of severe weather. Temperatures will continue to
be slightly warmer than normal.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 322 PM MDT Tue May 22 2018

Wednesday evening`s convection and potential for a couple
strong/severe storms over the Nebraska border area will shift
north and east through the evening. Some of this may be driven by
a departing speed max to our north, so perhaps a couple storms
could linger til midnight or so before exiting over the far
northeast corner. Otherwise, look for a drying and stabilizing
airmass into Thursday as flow aloft turns more westerly. There`s
just a slight chance of a storm developing Thursday afternoon over
the far eastern plains along the edge of a dryline, but overall
PoPs will be quite low. Temperatures will continue their warming
trend Thursday, reaching the mid 80s across most of the plains,
with 60s and 70s in the mountains.

Summerlike weather will continue Friday and Saturday with a high
amplitude ridge building over the forecast area. In fact, by
Saturday we should see highs reaching or exceeding 90F across most
of the plains. The threat for afternoon and evening storms will
be lower through this period, although we still can`t rule out an
isolated storm or two over the mountains and eastern plains.

The focus will then shift toward the relatively deep upper level
low moving into the Great Basin/Desert Southwest late this
Memorial Day Weekend into early next week. This may bring a round
of active weather with an increasing severe weather threat as the
system approaches. At this time, we think the highest chance of
storms would hold off until Monday and Tuesday considering how
slow these high amplitude patterns typically progress. Time will
tell how much low level moisture can be pulled in ahead of this
system, but the overall pattern right now looks favorable for gulf
moisture intrusion and more active and potentially severe
thunderstorms at this time.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 322 PM MDT Tue May 22 2018

Showers and maybe a few thunderstorms will move from south to
north over the Denver area airports over the next few hours.
Ceilings could drop to 6000-7000 feet AGL as showers move over.
Brief rain, small hail and gusty winds will accompany the storms.
Most shower activity should be finished by 9 PM or 10 PM. Winds
will be south to southeast for the most part. Wednesday should be
a repeat of this afternoon, although the latest models are a
little drier for that time period.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...Dankers
LONG TERM...Barjenbruch
AVIATION...Dankers



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