Special Weather Statement, NWS Denver/Boulder, CO

Area Forecast Discussion
National Weather Service Denver/Boulder CO
807 PM MDT Sat Jul 1 2017

.UPDATE...
Issued at 759 PM MDT Sat Jul 1 2017

Outflow bndry is moving nw across sern areas of CWA with deeper
low lvl moisture behind it. This was allowing for the development
of wdly sct storms over srn Lincoln county. Other wdly sct storms
were over srn Douglas county.  Hi res data suggest activity may
evolve into a small cluster and move across portions of Elbert
and Lincoln counties through midnight. Thus will keep in pops
south of a Castle Rock to Limon line.

&&

.SHORT TERM...(This evening through Sunday)
Issued at 318 PM MDT Sat Jul 1 2017

Fair weather cumulus over Park County and the northeast corner of
the state is all that has developed so far this afternoon. A few
light rainshowers may drift over the southern foothills and Palmer
Divide in the next few hours. Gusty winds and light rainfall is
all that will result.

Upper level ridging will continue to build over the state through
tonight and Sunday with even warmer temperatures moving in from
the west. Temperatures at 700 mb are forecast to be 5C warmer than
today, leading to some capping of the airmass tomorrow. However,
the ECMWF and NAM show some shower activity developing over the
mountains. Model soundings show modest instability with CAPE
values between 700 and 1000 j/kg. Afternoon highs will be in the
lower to mid 90s across the plains, since we are seeing mid and
upper 80s today.

.LONG TERM...(Sunday night through Saturday)
Issued at 318 PM MDT Sat Jul 1 2017

For Sun night a wk disturbance may move across the ern plains which
could produce a better chc of storms over the far nern corner.
Otherwise will keep activity in the wdly sct category.

On Mon the flow aloft will be nwly as a weak bndry moves across the
plains.  Cross-sections show there will be some mid lvl moisture
over the area so will keep in wdly sct tstms over the higher
terrain.  Across nern CO isold to wdly sct tstms may dvlp by mid to
late aftn nr the Cheyenne Ridge and across the Palmer Divide, which
will then move southeast across the plains in the evening hours. As
for highs readings will be in the upper 80s to lower 90s over nern
CO.

For the 4th of July an upper level high will build into the Great
Basin with nnw flow aloft over nrn CO.  Once again there may be
enough mid lvl moisture for wdly sct high based storms over the
higher terrain.  Over nern CO a wk bndry may move across the plains
late in the day with some increase in low lvl moisture.  Thus could
see isold to wdly sct storms mainly in the evening hours.  Highs will
be in the 90 to 95 degree range across nern CO.

By Wed an upper level high will expand fm the Great Basin into
Colorado and continue over the region thru Fri.  This will lead to
highs in the mid to upper 90s across the plains with little chc of
rain.  Over the higher terrain will mention isold to wdly sct tstms,
however, overall placement of upper lvl high will keep influx of
subtropical moisture to the west.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 759 PM MDT Sat Jul 1 2017

Winds remain nely however an outflow bndry is approaching fm the
southeast and should allow for winds to become sely by 9 pm. By
06z winds should become more sly and continue that direction
overnight.

&&

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

UPDATE...RPK
SHORT TERM...Dankers
LONG TERM...RPK
AVIATION...RPK

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Special Weather Statement
National Weather Service Denver CO
819 PM MDT SAT JUL 1 2017

COZ047-020245-
Southeast Elbert County Below 6000 Feet/South Lincoln County CO-
819 PM MDT SAT JUL 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL LINCOLN COUNTY
UNTIL 845 PM MDT...

At 818 PM MDT, Doppler radar was tracking a strong thunderstorm 6
miles southwest of Karval, or 42 miles south of Limon, moving
northeast at 10 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Karval.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3857 10362 3873 10372 3882 10347 3867 10337
TIME...MOT...LOC 0218Z 220DEG 10KT 3866 10359

RPK