Special Weather Statement, NWS Pueblo, CO

Area Forecast Discussion
National Weather Service Pueblo CO
319 PM MDT Sat Jul 17 2021

.SHORT TERM...(This evening through Sunday)
Issued at 239 PM MDT Sat Jul 17 2021

Scattered showers and thunderstorms are expected to continue over
the mountain and the eastern plains through the evening. Latest
mesoanalysis points out that the Baca County may be the region where
a severe storm is possible. CAPE values >2000 J/kg and 0-6km bulk
shear values around 30kts means that the environment is capable of
producing 1-1.5" hail and 60-70mph under the strongest storms. The
general idea is for thunderstorms to develop over the higher
elevations of the Raton Mesa and propagate easterly into the better
environment from 4pm to around 7PM this evening. Otherwise, the rest
of the region is expected to have outflow dominant storms through
the evening. As outflows spread from underneath the thunderstorms,
more pulse storms will develop. Main flash flood risk will dissipate
at around 7PM tonight as the diurnal wind fluctuations become
dominant and dampen the rising air over the mountains.

Sunday looks... quieter? As the upper level high pressure center
moves to the north-northeast, the best short waves will be outside
of the our forecast area. There is still the diurnal heating and
wind fluctuations that will cause isolated to scattered
thunderstorms, but the coverage, as compared to the last few days,
will be much less. A few areas of concern are the Raton Mesa and the
Colorado-Kansas border in which there are high levels of CAPE
expected to develop. If a shortwave does develop over those region,
initiating convection, then a stronger storm will be possible.

.LONG TERM...(Sunday night through Saturday)
Issued at 239 PM MDT Sat Jul 17 2021

Upper level ridge amplifies slowly over the next several days,
with center of the anticyclone overhead or just to the nw of srn
CO through the period. In general, upper pattern will keep the
main moisture plume south and west of the region, though brief
flattening of the ridge may allow for a temporary influx of
moisture Wed before drier air returns by the end of the week.
Greatest chances for precip this week will be along the
Continental Divide, as deep mid level moisture will be nearby
over wrn CO. Pops decrease farther east, though most mountains and
interior valleys will see at least isolated to scattered storms
each afternoon/evening as moisture is recycled under the ridge.
Southeast plains could see an isolated storm on Mon as old
outflows from Sunday night convection linger in a fairly unstable
environment, before mainly dry conditions develop from Tue into
next weekend as forcing is weak and unfavorable steering currents
keep most convection close to the higher terrain. Storm chances
along I-25 the biggest question, as steering flow collapses and
even becomes weak easterly at times through the period. Overall,
expect convection to stay mainly west of the Interstate most days,
though any stronger storms over the higher terrain could generate
enough outflow to drive an isolated storm or two farther east,
with Wed looking most likely for this to happen, as upper ridge
flattens briefly. With ridge nearby or overhead, temps near to
slightly above seasonal averages look likely, with trend of 12z
models/guidance slightly warmer than past few runs.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 239 PM MDT Sat Jul 17 2021

VFR conditions are expected over KALS, KCOS, and KPUB throughout the
forecast period. Each site has a chance at thunderstorms this
evening and during the afternoon tomorrow. Main concerns from those
storms will be gusty thunderstorm winds with a lower end chance at
MVFR and IFR conditions due to heavy rainfall lowering visibilities.
Diurnal wind fluctuations are expected outside of thunderstorm outflow
boundaries.

&&

.PUB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...SKELLY
LONG TERM...PETERSEN
AVIATION...SKELLY

Hazardous Weather Outlook
National Weather Service Pueblo CO
1149 AM MDT Sat Jul 17 2021

COZ058>089-093>099-181800-
Western Mosquito Range/East Lake County Above 11000 Feet-
Leadville Vicinity/Lake County Below 11000 Feet-
Eastern Sawatch Mountains Above 11000 Feet-
Western Chaffee County Between 9000 and 11000 Feet-
Central Chaffee County Below 9000 Feet-
Western Mosquito Range/East Chaffee County Above 9000 Feet-
Saguache County West of Continental Divide Below 10000 Feet-
Saguache County East of Continental Divide Below 10000 Feet-
La Garita Mountains Above 10000 Feet-
Upper Rio Grande Valley/Eastern San Juan Mountains Below
10000 Feet-Eastern San Juan Mountains Above 10000 Feet-
Del Norte Vicinity/Northern San Luis Valley Below 8500 Feet-
Alamosa  Vicinity/Central San Luis Valley Below 8500 Feet-
Southern San Luis Valley-
Northern Sangre de Cristo Mountains Between 8500 And 11000 Feet-
Northern Sangre de Cristo Mountains Above 11000 Feet-
Southern Sangre de Cristo Mountains Between 7500 and 11000 Feet-
Southern Sangre de Cristo Mountains Above 11000 Feet-
Northwestern Fremont County Above 8500 Feet-
Western/Central Fremont County Below 8500 Feet-
Wet Mountain Valley Below 8500 Feet-
Wet Mountains between 6300 and 10000 Feet-
Wet Mountains Above 10000 Feet-
Teller County/Rampart Range Above 7500 Feet/Pikes Peak Between
7500 And 11000 Feet-Pikes Peak Above 11000 Feet-
Canon City Vicinity/Eastern Fremont County-
Northern El Paso County/Monument Ridge/Rampart Range Below
7500 Feet-
Colorado Springs Vicinity/Southern El Paso County/Rampart Range
Below 7400 Feet-Pueblo Vicinity/Pueblo County Below 6300 Feet-
Walsenburg Vicinity/Upper Huerfano River Basin Below 7500 Feet-
Trinidad Vicinity/Western Las Animas County Below 7500 Feet-
Crowley County-La Junta Vicinity/Otero County-
Eastern Las Animas County-Western Kiowa County-
Eastern Kiowa County-Las Animas Vicinity/Bent County-
Lamar Vicinity/Prowers County-Springfield Vicinity/Baca County-
1149 AM MDT Sat Jul 17 2021

This hazardous weather outlook is for portions of central...east
central...south central and southeast Colorado.

.DAY ONE...Today and Tonight

Scattered thunderstorms will develop over the mountains around noon
and spread into the southeast plains this afternoon and evening. The
main risks with thunderstorms will be locally heavy rainfall,
lightning, small hail, and gusty erratic winds up to 50 mph.

One or two severe thunderstorms will be possible across northern
portions of the southeast plains late this afternoon and evening,
producing hail around 1 inch in diameter and wind gusts to around 60
mph. The area with the greatest risk of severe thunderstorms will be
northeast El Paso and Kiowa counties.

With the continued feed of moisture and more widespread thunderstorm
coverage over the mountains today, burn scar flash flooding will be
possible should one of the stronger storms impact these areas.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

The pattern is expected to remain active each day with afternoon
thunderstorms through the extended period. The most widespread
chances for thunderstorm activity will occur on Sunday, and one or
two storms across the far eastern plains may become strong to
severe. From Monday and onwards, the greatest potential for
thunderstorm activity will found across the higher terrain, and
especially along the Continental Divide.

Flash flooding due to heavy rain from slow-moving thunderstorms
will continue to be the primary concern.

.SPOTTER INFORMATION STATEMENT...

Weather conditions that meet reporting criteria for spotters will
possible across the southeast plains this afternoon and evening.

SKELLY/SKELLY

Special Weather Statement
National Weather Service Pueblo CO
546 PM MDT Sat Jul 17 2021

COZ085-180015-
Colorado Springs Vicinity/Southern El Paso County/Rampart Range Below
7400 Ft CO-
546 PM MDT Sat Jul 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL EL PASO COUNTY
UNTIL 615 PM MDT...

At 546 PM MDT, Doppler radar was tracking a strong thunderstorm over
Hanover, or 23 miles southeast of Colorado Springs, moving southeast
at 20 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Hanover.

LAT...LON 3868 10462 3871 10440 3853 10430 3853 10456
      3862 10462
TIME...MOT...LOC 2346Z 317DEG 18KT 3863 10446

Cohen

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
552 PM MDT SAT JUL 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0552 PM     HAIL             PRITCHETT               37.37N 102.86W
07/17/2021  E1.00 INCH       BACA               CO   PUBLIC

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
554 PM MDT SAT JUL 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0541 PM     HAIL             PRITCHETT               37.37N 102.86W
07/17/2021  E1.00 INCH       BACA               CO   PUBLIC

            CORRECTS PREVIOUS HAIL REPORT FROM
            PRITCHETT.

&&

Special Weather Statement
National Weather Service Pueblo CO
558 PM MDT Sat Jul 17 2021

COZ099-180030-
Springfield Vicinity/Baca County CO-
558 PM MDT Sat Jul 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL BACA COUNTY UNTIL
630 PM MDT...

At 558 PM MDT, Doppler radar was tracking a strong thunderstorm near
Pritchett, or 19 miles west of Springfield, moving southwest at 15
mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

This storm will remain over mainly rural areas of west central Baca
County.

LAT...LON 3740 10291 3727 10285 3715 10308 3735 10308
TIME...MOT...LOC 2358Z 046DEG 14KT 3731 10295

Cohen

Special Weather Statement
National Weather Service Pueblo CO
603 PM MDT Sat Jul 17 2021

COZ094-180030-
Eastern Las Animas County CO-
603 PM MDT Sat Jul 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LAS ANIMAS COUNTY UNTIL
630 PM MDT...

At 603 PM MDT, Doppler radar was tracking a strong thunderstorm 18
miles southeast of Thatcher, or 36 miles east of Trinidad. This storm
was nearly stationary.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

This storm will remain over mainly rural areas of eastern Las Animas
County.

LAT...LON 3739 10379 3729 10372 3722 10383 3722 10395
      3736 10398
TIME...MOT...LOC 0003Z 057DEG 2KT 3733 10387

Cohen

Special Weather Statement
National Weather Service Pueblo CO
603 PM MDT Sat Jul 17 2021

COZ094-180030-
Eastern Las Animas County CO-
603 PM MDT Sat Jul 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL LAS ANIMAS COUNTY
UNTIL 630 PM MDT...

At 603 PM MDT, Doppler radar was tracking a strong thunderstorm 19
miles northwest of Pritchett, or 30 miles west of Springfield, moving
southwest at 10 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

This storm will remain over mainly rural areas of east central Las
Animas County.

LAT...LON 3759 10310 3748 10308 3738 10327 3755 10333
TIME...MOT...LOC 0003Z 065DEG 9KT 3752 10315

Cohen