textproduct: Pueblo

KEY MESSAGES

- Fog this morning far eastern plains then dry and breezy with elevated fire danger along portions of the I-25 corridor this afternoon. Low clouds and fog return tonight across the plains.

- Warm and increasingly windy next week, with a chance for critical fire weather conditions Wednesday.

- Snow showers possibly returning to the central mountains mid/late week.

UPDATE

Issued at 539 AM MST Sat Dec 13 2025

KLAA observation and Web Cams along highway 50 in Prowers county show poor visibility in fog this morning with KLAA reporting 1/2 to 1/4 mile at times. Have issued a Dense Fog advisory for eastern Kiowa and prowers county until 9 AM.

SHORT TERM /THROUGH TONIGHT/

Issued at 241 AM MST Sat Dec 13 2025

Fog has developed early this morning across portions of Kiowa and Prowers counties as southerly low level flow increases ahead of the deepening lee side surface trough. Flow aloft will shift more westerly which will help erode low clouds and fog eastward early this morning.

Energy dropping through the northern plains this morning will send a cold front through southeast CO with low level winds shifting from an easterly upslope direction by this afternoon. Increasing winds will aide with mixing, in spite of some cold air advection aloft, allowing post frontal temperatures to still warm into the 50s to lower 60s across the plains. The warmest readings will be along the I-25 corridor where it will take the longest for the cooler air to work its way westward. Fire danger along the lower eastern slopes of the southeast mountains into portions of the I-25 corridor will be elevated today as breezy west winds ahead of the frontal passage combine with critically low humidity values near or below 15 percent. These conditions will be spotty and brief however, with humidity rising slowly as winds shift from a more easterly direction. Therefore no fire weather highlights look necessary. Elsewhere, the mountains and valleys will see temperatures fairly similar to a degree or two cooler than yesterday with dry conditions and breezy northwest winds.

Easterly low level flow tonight will allow stratus and fog to redevelop across a larger portion of the southeast plains after midnight, particularly along and north of the Arkansas River/highway 50 corridor. KCOS may be right on the north west edge of this development as northerly winds off the Palmer may help to focus it just south of the city. Have introduced some fog and low clouds into the grids during the late night hours. Otherwise, it will remain dry across the mountains and valleys overnight with good radiational cooling allowing valley temperatures to dip down into the lower teens. Have cooled min temperatures several degrees for our typical cold pool valley locations. -KT

LONG TERM /SUNDAY THROUGH FRIDAY/

Issued at 241 AM MST Sat Dec 13 2025

Patchy low clouds and fog will linger through the morning on Sunday, especially through the lower Arkansas Valley, where light easterly winds will persist. In fact, with a weak La Junta surface low in place for much of the day, easterly gradient will keep the Arkansas Valley cooler than surrounding areas, with max temps only in the upper 40s/lower 50s from Pueblo eastward. Elsewhere, temps will be slightly cooler than Sat numbers at most locations, though still some downslope enhanced readings in the 60s possible, especially over lee slopes west of I-25.

Weak upper low drifts through the swrn U.S. upper ridge on Mon, but only impact on srn CO weather will be to keep winds rather light, as strong mid/upper nw flow is briefly disrupted by passing system.

Starting Tue, flow across the wrn U.S. becomes more zonal, as upper ridge is suppressed off the California coast, bringing warmer temperatures and stronger winds to srn CO for much of the week. Wed looks like the windiest day, as upper jet will sag southward into nrn Colorado, and 700h flow across srn CO increases above 40 kts. Ahead of the jet's arrival, brief window for some mountain wave strong winds possible Wed morning, as weak reverse shear profile develops, before jet moves overhead and wave breaks down by afternoon. Still a lot to timing/location details to be worked out, but ensemble guidance suggests a near 50 percent chance of winds above 50 mph over much of the higher terrain along/west of I-25 Wed/Wed night. Fire danger will increase as well on Wed, as minimum relative humidity falls off toward 15 percent across the I-25 corridor and portions of the southeast plains during the day. Still breezy to windy Thu/Fri with jet overhead and strong mid-level flow, while snow showers return to the higher peaks of the central mountains as moisture and weak energy race eastward across the Continental Divide. Maxes may briefly cool Thu with a weak cold front, before deeper mixing and warmer air return on Fri.

AVIATION /12Z TAFS THROUGH 12Z SUNDAY/

Issued at 427 AM MST Sat Dec 13 2025

VFR conditions expected for the terminals today with breezy north to northwest winds at KCOS and KPUB this morning shifting to the east and southeast in the afternoon. Peak gusts up to 20 to 25 kts will be possible. Stratus and fog will develop tonight across the plains with best chances of IFR conditions or lower expected after 06z for both KCOS and KPUB. KCOS may see more low clouds than fog as winds shift around from a northerly downslope direction after 06z. Will keep lowest vis/cigs at KPUB based on consensus of short range high resolution models.

KALS will see VFR conditions an persistent light and variable winds over the 24 hour period. -KT

PUB WATCHES/WARNINGS/ADVISORIES

Dense Fog Advisory until 9 AM MST this morning for COZ096-098.