Special Weather Statement, NWS Pueblo, CO

Area Forecast Discussion
National Weather Service Pueblo CO
341 PM MDT Tue Sep 14 2021

.SHORT TERM...(This evening through Wednesday)
Issued at 339 PM MDT Tue Sep 14 2021

Main Forecast Concerns/Challenges:

1) The strong to severe thunderstorm risk will continue into mid
evening, as scattered thunderstorms will continue to develop and
drift east southeast through the plains.

2) The strongest storms will be capable of producing hail up to 1 to
around 1.5 inches and wind gusts to 65 mph.

Latest radar imagery showing thunderstorm development persisting
across the Pikes Peak region and parts of the higher terrain. Focus
for strongest development is occurring over the El Paso county area
at this time, where large scale ascent combined with low level
southerly/upslope flow is occurring. Given more recent strengthening
trends with storm intensity and organization, a likely uncapped
environment with bulk shear of 30-40 kt will support a continued
risk of strong to severe storms over the next 2-3 hours, especially
across the El Paso and Pueblo counties. Large hail up to 1 to around
1.5 inches and wind gusts to 65 mph will continue to be the main
hazards.

Upper level support will drift to the east through early this
evening, with the current scattered thunderstorms also pushing east.
As they move east, they will be encountering higher dewpoint air and
stronger instability, with the risk of strong to severe storms
continuing. Given recent trends, don't see any reason why this risk
won't continue, though the previously mentioned uncertainty with
some stable air in place does continue. By early this evening, will
lose daytime heating, and an increase with CIN will likely become
more of a possibility. If storms remain isolated, the intensity may
bounce around. If they congeal into more into linear segments, then
I think there is a higher chance for the intensity and risk for
severe storms to be higher. During this time, some short term
guidance is indicating a trend towards more linear segments and this
seems like a reasonable solution as the LLJ should be increasing
during this time. So, with this possibility, think a wind threat
will be the main hazard across the eastern plains this evening.

For the remainder of the night, convection will continue to wind
down by late in the evening, as any remaining storms exit to the
southeast. This drying trend will continue through the night and
into Wednesday, as ridging aloft occurs and drier air moves across
the region. Can't completely rule out a stray shower or storm off
the higher terrain, however, chances look to be rather low at this
time. Air mass does rebound/warm on Wednesday, with above normal
temps returning to the region.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 339 PM MDT Tue Sep 14 2021

For Wednesday...there could be an isolated thunderstorm or two over
the southern mountains/Raton area during the afternoon and early
evening hours.

For Thursday...spotty critical fire weather conditions will be
possible over the southern San Juan Valley for a few hours during
the afternoon.

For Friday...critical fire weather conditions will be possible over
the SW San Juan Valley, northern central mountains, especially for
the Sawatch Range, and for the plains in Fremont, SW El Paso, and NW
Pueblo counties. There could also be some spotty areas of critical
fire weather conditions within the Rampart Range.

For Saturday...there could be a few thunderstorms over the northern
central mountains during the afternoon and early evening hours.
There could be some spotty areas of critical fire weather criteria
for NE El Paso and Baca counties.

For Sunday...there could be some afternoon and early evening
thunderstorms over the central mountains. Spotty areas of critical
fire weather conditions could be possible for some areas of the
southern San Juan Valley, I-25 corridor, and southeastern plains.

For Monday...there could be thunderstorms developing over the
mountains later in the afternoon and evening. Some rain/snow showers
could continue into the overnight hours over the northern Sawatch
Range. There could also be some areas of critical fire weather
conditions for the central and southern San Luis Valley, as well as
the plains in Fremont county, as well as for the central plains and
western Huerfano County.

For Tuesday...scattered showers and thunderstorms will be possible
over the mountains. There could be some areas of critical fire
weather conditions for the La Garitas, as well as the central and
southern San Luis Valley.

Detailed discussion:

Wednesday...

With passage of the cold front from the associated major shortwave
trough downstream and drier air behind it, along with high pressure
building in behind over SE Utah, there will be a very limited
availability of moisture. Due to this, only a few isolated
thunderstorms could occur with just enough afternoon instability and
orographic lifting, along with some residual moisture, over the
southern mountains/Raton mesa area. Dry conditions are expected
across all other areas of the CWA. Wind will return to a more
southeasterly direction over the plains and southwesterly over the
mountains, therefore temperatures will rebound to be a little warmer
than the were on Tuesday, with highs in the mid 80s to low 90s over
the plains, to the 70s and 80s for the upper Arkansas River
Valley and San Luis Valley/high mountain valley, to the 50s and
60s for high country, and around 45 for the fourteeners.

Thursday through Friday...

A long wave trough upstream over SW Canada is going to continue to
slightly deepen and propagate towards the north of the region with
the southwesterly low to mid level flow becoming predominant
throughout the course of these days. Because of this, with a very
dry air mass in place and downsloping winds which will increase,
there could be spotty critical fire weather conditions will be
possible over the southern San Juan Valley for a few hours during
the afternoon on Thursday. Then again on during the afternoon on
Friday, critical fire weather conditions will be possible over the
SW San Juan Valley, northern central mountains, especially for the
Sawatch Range, and for the plains in Fremont, SW El Paso, and NW
Pueblo counties. There could also be some spotty areas of critical
fire weather conditions within the Rampart Range. As the trough
passes to the north, there will be some moisture moving into the mid
levels by Friday, however, all of the models are keeping any
precipitation over northern Colorado at this time. The downsloping
winds will also cause conditions to become very warm and well above
average, especially on Thursday, where some locations could get
close to their daily high record.

Saturday through Sunday...

An upper level low off the coast of southern California will help to
draw in some monsoonal moisture from northern Mexico, meanwhile
there will be another longwave trough beginning to deepen over the
NW CONUS. Ahead of this trough, some of the moisture in the mid
levels will be advected over Colorado and this could allow for
some convection to be possible over the central mountains during
the afternoon and evening. The continued southwesterly flow with
downsloping winds will also cause some spotty areas of critical
fire weather conditions for the central and southern San Luis
Valley, as well as the plains in Fremont county, as well as for
the central plains and western Huerfano County.

Monday through Tuesday...

The deterministic models tend to differ by this timeframe with the
deepening trough that is going to impact the region early next week.
The GFS has the trough being a bit more shallow and propagating
through at a slightly quicker pace than the ECMWF, whereas this
model has the trough being a little deeper and slower. The ECMWF
also shows this being a stronger low with a well defined occlusion
over the northern plains. Ensembles do show quite a difference of
contrast between the moisture availability, as well as how much cold
air is associated with this low pressure system at this time. This
will need to be further analyzed in the upcoming days to see which
model has more consistency, but either way, it is safe to say that
the region will be impacted by a major shortwave trough that will
end up bringing a better chance of thunderstorms over the mountains,
higher elevation snowfall, and much cooler temperatures. -Stewey

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 339 PM MDT Tue Sep 14 2021

Active weather will continue across the TAF sites early in the
forecast period, especially over COS and PUB, where a period of
thunderstorms will remain possible through early this evening.
Storms pulling away from the higher terrain are still expected to
impact COS and PUB, mainly for a 1-3 hour time frame. Do think there
is some potential for these storms to at least be on the stronger
side, with small hail and stronger northerly gusts possible under
these storms. ALS could still see a window of some light showers
through early this evening, before dry conditions return. Dry and
VFR conditions then expected for all the TAF sites through the
remainder of the forecast period tonight into Wednesday afternoon.

&&

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

SHORT TERM...RODRIGUEZ
LONG TERM...STEWARD
AVIATION...RODRIGUEZ

Hazardous Weather Outlook
National Weather Service Pueblo CO
1138 AM MDT Tue Sep 14 2021

COZ058>089-093>099-151745-
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-
1138 AM MDT Tue Sep 14 2021

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

.DAY ONE...This Afternoon and Tonight

A few severe thunderstorms are expected this afternoon and
evening across the southeast plains. Storms will develop over the
greater Pikes Peak region by early to mid afternoon and gradually
push southeast across the plains by mid to late afternoon, and
over the far eastern plains by early evening. The storms will be
capable of hail up to 1 to 1.5 inches and wind gusts to 55 to 65
mph.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Warmer, drier and occasionally breezy weather will return to the
area through the rest of the work week and into the weekend. This
will lead to the return of well above seasonal temperatures and
increasing fire danger areawide.

.SPOTTER INFORMATION STATEMENT...

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

RODRIGUEZ

Special Weather Statement
National Weather Service Pueblo CO
512 PM MDT Tue Sep 14 2021

COZ083-086-142345-
Pueblo Vicinity/Pueblo County Below 6300 Feet CO-
Canon City Vicinity/Eastern Fremont County CO-
512 PM MDT Tue Sep 14 2021

...A strong thunderstorm will impact portions of southeastern
Fremont, northeastern Custer and western Pueblo Counties through 545
PM MDT...

At 512 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles southeast of Florence, or 10 miles northeast of Junkins Burn
Scar, moving southeast at 20 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This storm will remain over mainly rural areas of southeastern
Fremont, northeastern Custer and western Pueblo Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
central and southeastern Colorado.

&&

LAT...LON 3826 10511 3832 10509 3828 10485 3816 10489
TIME...MOT...LOC 2312Z 300DEG 17KT 3827 10503

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Cohen

Special Weather Statement
National Weather Service Pueblo CO
516 PM MDT Tue Sep 14 2021

COZ074-088-142345-
Southern Sangre De Cristo Mountains Between 7500 and 11000 Ft CO-
Trinidad Vicinity/Western Las Animas County Below 7500 Ft CO-
516 PM MDT Tue Sep 14 2021

...A strong thunderstorm will impact portions of southwestern Las
Animas County through 545 PM MDT...

At 516 PM MDT, Doppler radar was tracking a strong thunderstorm over
Segundo, or 14 miles west of Trinidad, moving east at 25 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Boncarbo around 520 PM MDT.
  Cokedale around 535 PM MDT.

Other locations in the path of this storm include Starkville and
Raton Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
southeastern Colorado.

&&

LAT...LON 3701 10485 3720 10486 3726 10463 3718 10457
      3700 10439 3699 10456
TIME...MOT...LOC 2316Z 279DEG 21KT 3712 10475

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

KTS

Special Weather Statement
National Weather Service Pueblo CO
537 PM MDT Tue Sep 14 2021

COZ079-086-150015-
Pueblo Vicinity/Pueblo County Below 6300 Feet CO-
Wet Mountains between 6300 and 10000Ft CO-
537 PM MDT Tue Sep 14 2021

...Strong thunderstorms will impact portions of central Pueblo County
through 615 PM MDT...

At 537 PM MDT, Doppler radar was tracking scattered strong
thunderstorms along a line extending from 8 miles east of Boone to 6
miles west of Pueblo Reservoir. Movement was east at 10 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

These storms will remain over mainly rural areas of central Pueblo
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
southeastern Colorado.

&&

LAT...LON 3839 10407 3833 10489 3812 10503 3805 10408
TIME...MOT...LOC 2337Z 282DEG 8KT 3825 10410 3824 10488

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Cohen

Special Weather Statement
National Weather Service Pueblo CO
541 PM MDT Tue Sep 14 2021

COZ074-088-094-150045-
Southern Sangre De Cristo Mountains Between 7500 and 11000 Ft CO-
Eastern Las Animas County CO-
Trinidad Vicinity/Western Las Animas County Below 7500 Ft CO-
541 PM MDT Tue Sep 14 2021

...A strong thunderstorm will impact portions of south central Las
Animas County through 645 PM MDT...

At 541 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles south of Hoehne, or 9 miles east of Trinidad, moving east at 20
mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Trinchera and Branson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
southeastern Colorado.

&&

LAT...LON 3714 10475 3721 10449 3727 10415 3700 10361
      3700 10477
TIME...MOT...LOC 2341Z 290DEG 19KT 3716 10434

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

KTS

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