Flash Flood Warning 51, NWS Pueblo, CO

146 
WGUS75 KPUB 012254
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
454 PM MDT Sat Aug 1 2020

COC023-055-020100-
/O.CON.KPUB.FF.W.0051.000000T0000Z-200802T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Huerfano CO-Costilla CO-
454 PM MDT Sat Aug 1 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR
WEST CENTRAL HUERFANO AND NORTHEASTERN COSTILLA COUNTIES...

At 450 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain have move off the Spring burn north of Highway 160. However, 
radar is indicating between one half inch and one inch of rain has 
already fallen on this portion of the scar, with Flash flooding 
ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flooding of small creeks and streams, urban areas, 
         highways, streets and underpasses as well as other drainage 
         and low lying areas.

Some locations that will experience flooding include...
Spring Burn Scar north of Highway 160, northwestern Spring Burn Scar
south of Highway 160 in Huerfano county, northern Spring Burn Scar
south of Highway 160 in Costilla county and La Veta Pass.

This includes the following areas, South Abeyta Creek near County
Road 441.
  
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3766 10497 3753 10508 3762 10523 3767 10526
      3772 10518

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.50-1 INCHES IN 1 HOUR

$$

mw

381 
WGUS75 KPUB 020030
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
630 PM MDT Sat Aug 1 2020

COC023-055-020039-
/O.CAN.KPUB.FF.W.0051.000000T0000Z-200802T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Huerfano CO-Costilla CO-
630 PM MDT Sat Aug 1 2020

...THE FLASH FLOOD WARNING FOR WEST CENTRAL HUERFANO AND NORTHEASTERN
COSTILLA COUNTIES IS CANCELLED...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.

LAT...LON 3766 10497 3753 10508 3762 10523 3767 10526
      3772 10518

$$

mw

Area Forecast Discussion
National Weather Service Pueblo CO
310 PM MDT Sat Aug 1 2020

.SHORT TERM...(This evening through Sunday)
Issued at 310 PM MDT Sat Aug 1 2020

Upper pattern remains the same as the past few days, with high
pressure over the desert sw and moderate n-nw flow aloft across CO.
Some subtle changes at the lower levels versus 24 hrs ago, as
surface dewpoints are around 5-8 degf below yesterday's numbers at
this time, leading to a corresponding decrease in instability over
much of the region. Certainly still enough CAPE (500-1000 j/kg) at
most locations to support convection, though radar trends through
21z show mostly weak storms so far. Will continue with sct pops over
much of the area into the evening, and a strong storm or two still
looks possible along and west of I-25, where instability is
maximized. Activity again fades away mid to late evening with loss
of heating.

On Sunday, stronger upslope push expected over the eastern mountains
and plains as surface high pressure builds southward through the
central U.S. Upper flow remains mainly unchanged as swrn ridge
builds only slightly northeastward through the day. Given increase
in moisture and low level wind speed, shear (0-6km 30-40 kts) and
instability (CAPE of 1k-2k j/kg) look more favorable for
widespread/stronger storms along and east of the mts Sunday
afternoon and evening, with SWODY2 over the much of the area looking
reasonable. Thought about a flash flood watch for area burn scars
given increasing moisture, though pwat over the mountains only
slightly increases as upslope flow remains rather shallow, so will
hold off for now, though acknowledge that threat for flooding will
increase. Max temps will change little, with readings within a few
degf of Saturday's numbers.

.LONG TERM...(Sunday night through Saturday)
Issued at 310 PM MDT Sat Aug 1 2020

Sunday night through Monday...Very similar pattern in place across
the forecast area through Mon. The ridge of high pressure over the
southwestern US will keep north to northwest flow aloft in place
across CO, while at the surface easterly winds will keep llvl
moisture in place across the plains. Surface winds do not swing
around to a more southerly direction until Mon aftn, so abundant
available moisture will be in place from Sun evening through at
least the first half on Mon, and SPC has painted a Marginal Risk
area for severe storms across the eastern plains for Mon. The flash
flood threat for area burn scars will remain as well since the
steering flow for storms will be out of the n-nw, increasing the
training potential. Likely to categorical pops are in place for the
higher terrain and valleys, with scattered pops along the I-25
corridor. Overnight low temps Sun night will cool into the 40s for
the high valleys, while remaining somewhat mild for the plains in
the mid 50s to around 60F. Max temps Mon are expected to warm into
the 80s for most areas.

Tuesday and Wednesday...Models are indicating a slight chance in the
overall pattern across the region for midweek, as compared to the
expected progression from yesterday. An upper low will track across
the Pacific NW, southern Canada and northern Rockies on Tue and Wed,
but the upper ridge will hold steady and remain in place, with the
ridge axis continuing along the UT and CO state line. The flow aloft
will shift slightly however, and become more west to northwest. This
will help to push some of the llvl moisture back to the east,
bumping max temps upward into the 80s for the high valleys, and mid
80s to lower 90s for the plains both days. There will be enough
residual moisture available that there will be a daily chance of
scattered convection over the higher terrain and adjacent plains
each aftn and eve.

Thursday through Saturday...The upper ridge axis finally starts to
move and shifts east into Kansas, as a longwave trough establishes
over the western US. This will open up the southwest tap of Pacific
moisture into the desert sw and Four Corners region, with increased
pcpn chances for the higher terrain each day. Plan on highs in the
mid 70s to around 80F for the high valleys, and 85-95F for the
plains. Moore

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 310 PM MDT Sat Aug 1 2020

Scattered tsra expected over and near the mountains this afternoon
and evening, with activity generally moving toward the s-se. Storms
will move toward lower elevations 21z-23z, with vcts at all taf
sites until 01z-03z. Gusty winds the main risk with storms, with
brief MVFR cigs/vis in heavy rain under the strongest cells.
Activity gradually ends 03z-05z this evening, with light winds
overnight. Expect convection to become more widespread on Sunday,
impacting all terminals in the afternoon and evening.

&&

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

SHORT TERM...PETERSEN
LONG TERM...MOORE
AVIATION...PETERSEN

Hazardous Weather Outlook
National Weather Service Pueblo CO
1139 AM MDT Sat Aug 1 2020

COZ058>089-093>099-021745-
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-
1139 AM MDT Sat Aug 1 2020

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

.DAY ONE...This Afternoon and Tonight

Isolated to scattered thunderstorms are expected this afternoon and
evening in and near the mountains.  The main risk with thunderstorms
will be gusty winds up to 50 mph, brief heavy rainfall, and
dangerous cloud to ground lightning. However, one or two storms
could briefly become strong across the southeast mountains and
I-25 corridor, producing hail up to the size of nickels and wind
gusts up to 60 mph. Localized flash flooding will be possible on
area burn scars should these locations be directly impacted.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Widespread thunderstorms are expected over the mountains on Sunday
and Monday afternoon and evening. Flash flooding will be possible
if a stronger storm develops over the Spring, Decker, Junkins, or
Hayden Pass burn scars. Some severe storms are possible over the
adjacent plains on Sunday and Monday afternoon and evening, with
the main risks being large hail and strong winds.

Isolated to scattered thunderstorms are expected over the
mountains from Tuesday through Friday. If a stronger storm
develops over a burn scar, flash flooding is possible. Isolated
thunderstorms are expected over the lower elevations Tuesday
through Friday.

.SPOTTER INFORMATION STATEMENT...

Weather conditions that meet reporting criteria for spotters will be
possible this afternoon and evening in and near the mountains.

10/SKELLY

Special Weather Statement
National Weather Service Pueblo CO
318 PM MDT Sat Aug 1 2020

COZ065-066-069-070-012200-
La Garita Mountains Above 10000 Ft CO-
Alamosa  Vicinity/Central San Luis Valley Below 8500 Ft CO-
Saguache County East of Continental Divide below 10000 Ft CO-
Del Norte Vicinity/Northern San Luis Valley Below 8500 Ft CO-
318 PM MDT Sat Aug 1 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ALAMOSA...
NORTHEASTERN RIO GRANDE AND SOUTH CENTRAL SAGUACHE COUNTIES UNTIL 400
PM MDT...

At 316 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of La Garita, or about 35 miles northwest of
Alamosa, moving southeast at 30 mph.

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

Locations impacted include...
Monte Vista, Center and La Garita.

LAT...LON 3793 10651 3805 10634 3771 10590 3754 10616
TIME...MOT...LOC 2116Z 319DEG 25KT 3794 10637

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