187
FXUS65 KPUB 151144
AFDPUB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PUEBLO CO
544 AM MDT TUE SEP 15 2026
KEY MESSAGES
- COLD FRONT THIS MORNING WITH COOLER TEMPERATURES THIS
AFTERNOON. THUNDERSTORMS LOOK TO REMAIN CONFINED TO THE HIGHER
TERRAIN.
- MULTIPLE WAVES WEDNESDAY THROUGH FRIDAY WILL COMBINE WITH
ABUNDANT MOISTURE TO PRODUCE THUNDERSTORMS WITH HEAVY RAIN,
ESPECIALLY FOR THE SOUTHERN MOUNTAINS.
- SOME UNCERTAINTY FOR THE WEEKEND INTO EARLY NEXT WEEK WITH THE
PATTERN EVOLUTION.
SHORT TERM /THROUGH TONIGHT/
ISSUED AT 1235 AM MDT TUE SEP 15 2026
CURRENTLY...SATELLITE IMAGERY SHOWS WIDESPREAD CLOUD COVER
ACROSS SOUTHERN COLORADO EARLY THIS MORNING IN PERSISTENT
SOUTHWEST FLOW. RADAR SHOWS LIGHT RAIN SHOWERS ACROSS THE
CONTINENTAL DIVIDE WHICH WILL CONTINUE THROUGH MUCH OF THE EARLY
MORNING HOURS. TEMPERATURES ARE CURRENTLY IN THE 60S ACROSS THE
PLAINS. A COLD FRONT IS FORECAST TO DROP SOUTH ACROSS THE PLAINS
EARLY THIS MORNING, WITH GUSTY NORTH WINDS 20 TO 30 MPH FORECAST
THROUGH DAYBREAK. THIS WILL BRING COOLER TEMPERATURES BY
MORNING WITH MOST AREAS ON THE PLAINS IN THE 50S TO LOW 60S.
THERE COULD BE SOME PATCHY FOG ACROSS THE SAN LUIS VALLEY
THROUGH MORNING.
TODAY AND TONIGHT...THE COLD FRONT WILL TRAVEL SOUTH ACROSS THE
PLAINS THIS MORNING WITH NORTHERLY FLOW SHIFTING SOUTHEAST BY
THIS AFTERNOON. MOISTURE WILL SLOWLY INCREASE WITH DEWPOINTS IN
THE 50S EXPECTED BY THIS EVENING. TEMPERATURES WILL BE COOLER,
WITH MAINLY 70S ACROSS THE PLAINS AND SAN LUIS VALLEY.
INSTABILITY LOOKS TO BE LIMITED TODAY, WITH LESS THAN 500 J/KG
ACROSS THE HIGHER TERRAIN. EXPECT SHOWERS AND THUNDERSTORMS TO
REMAIN CONFINED TO THE CONTINENTAL DIVIDE, WITH MORE ISOLATED TO
SCATTERED ACTIVITY BY LATE AFTERNOON TO EARLY EVENING OVER THE
EASTERN MOUNTAINS. LACK OF INSTABILITY ON THE PLAINS SHOULD HELP
LIMIT SHOWER AND THUNDERSTORM ACTIVITY, KEEPING AREAS EAST OF
I-25 DRY. LIGHTNING, BRIEF HEAVY RAINFALL AND WIND GUSTS NEAR 40
MPH MAY ACCOMPANY ANY STRONGER STORMS OVER THE HIGHER TERRAIN.
OVERNIGHT LOWS TONIGHT WILL FALL INTO THE 50S ACROSS THE PLAINS
AND 40S FOR THE SAN LUIS VALLEY.
LONG TERM /WEDNESDAY THROUGH MONDAY/
ISSUED AT 1235 AM MDT TUE SEP 15 2026
MODELS IN GOOD AGREEMENT THROUGH FRIDAY, WITH DIFFERENCES
SHOWING UP FOR THE WEEKEND INTO EARLY NEXT WEEK. ACTIVE WEATHER
IS EXPECTED FOR MID TO LATE WEEK, WITH UNCERTAINTY HEADING INTO
THE WEEKEND AND EARLY NEXT WEEK.
WEDNESDAY THROUGH FRIDAY...AN UPPER LOW WILL SLOWLY SHIFT EAST
OUT OF THE PACIFIC NORTHWEST, WHILE UPPER HIGH PRESSURE SITS
ACROSS THE SOUTHEAST STATES. THIS WILL PUT SOUTHERN COLORADO
UNDER SOUTH TO SOUTHWESTERLY FLOW, WITH MULTIPLE UPPER WAVE
MOVING NORTH ACROSS THE STATE. PWAT VALUES INCREASE
SIGNIFICANTLY TO IN EXCESS OF 1 INCH, WHILE DEWPOINTS REMAIN
ELEVATED IN THE 50S AND LOWER 60S ACROSS THE REGION. ALL POINT
TO EFFICIENT RAIN PRODUCING THUNDERSTORMS ACROSS THE HIGHER
TERRAIN. THE MAIN VORT MAX TRAIN RUNS FROM ARIZONA, NORTHEAST
INTO NORTHEAST COLORADO, WITH AREAS OVER THE HIGHER TERRAIN,
PALMER DIVIDE AND RATON MESA FAVORED. ISSUED A FLASH FLOOD WATCH
FOR THE EASTERN SAN JUAN MOUNTAINS AND UPPER RIO GRANDE VALLEY
FOR WEDNESDAY AFTERNOON THROUGH THURSDAY EVENING. THE FIRST
UPPER WAVE WILL LIFT NORTH WEDNESDAY AFTERNOON AND EVENING, WITH
PERIODS OF HEAVY RAIN EXPECTED ACROSS THE COLORADO MOUNTAINS. A
BRIEF LULL IS EXPECTED THURSDAY MORNING, BEFORE ANOTHER UPPER
WAVE LIFTS INTO THE SOUTHWEST PORTION OF THE STATE THURSDAY
AFTERNOON. THIS WILL LEAD TO ANOTHER ROUND OF HEAVY RAIN
PRODUCING THUNDERSTORMS. FURTHER EAST, SHOWERS AND THUNDERSTORMS
ARE EXPECTED, BOTH WEDNESDAY AND THURSDAY AFTERNOON AND
EVENINGS, FAVORING THE PALMER DIVIDE AND RATON MESA. MODELS
DIFFER ON HOW FAR EAST TO TRACK THUNDERSTORMS, BUT THEY COULD
SHIFT OFF THE HIGHER TERRAIN AND IMPACT PORTIONS OF THE PLAINS
THROUGH THE OVERNIGHT HOURS. FLASH FLOODING MAY BE POSSIBLE ON
AREA BURN SCARS AND A WATCH MAY BE NEEDED.
THE UPPER LOW TRACKS EASTWARD INTO THE NORTHERN ROCKIES ON
FRIDAY SHIFTING THE MAIN VORT MAX FEED EAST INTO EASTERN
COLORADO. THIS WILL LIKELY BE THE BEST CHANCES FOR AREAS ON THE
PLAINS TO SEE SHOWER AND THUNDERSTORM ACTIVITY. MOUNTAIN AREAS
WILL CONTINUE TO SEE PERIODS OF HEAVY RAINFALL ON FRIDAY, WITH A
CONTINUED FLASH FLOOD RISK.
TEMPERATURES LOOK TO REMAIN COOLER, WITH 70S AND 80S EACH
AFTERNOON WEDNESDAY THROUGH FRIDAY. OVERNIGHT LOWS WILL FALL
INTO THE 50S AND 60S ACROSS THE PLAINS.
SATURDAY THROUGH TUESDAY...THERE IS A HIGH DEGREE OF SPREAD
AMONG THE DETERMINISTIC GUIDANCE AND ENSEMBLES HEADING INTO THE
WEEKEND AND EARLY NEXT WEEK. THE GFS REMAINS ACTIVITY WITH A
QUICK MOVING UPPER RIDGE OVER THE WEEKEND, FOLLOWED BY ANOTHER
UPPER WAVE TRACKING ACROSS COLORADO EARLY NEXT WEEK. THE GFS
WOULD DRY SOUTHERN COLORADO OUT OVER THE WEEKEND, WITH A RETURN
TO WET CONDITIONS EARLY NEXT WEEK. THE ECMWF AND CANADIAN ARE
SIMILAR TO THE GFS WITH AN UPPER RIDGE FOR THE WEEKEND, BUT
DIFFER BY EARLY NEXT WEEK, WITH A BROAD TROUGH OUT WEST AND
SOUTHWESTERLY FLOW ACROSS COLORADO. OVERALL, DRIER AND WARMER
WEATHER IS FORECAST FOR THE WEEKEND, WITH ACTIVE WEATHER HEADING
INTO EARLY NEXT WEEK WITH THE GFS THE WETTEST GUIDANCE COMPARED
TO THE ECMWF AND CANADIAN.
AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
ISSUED AT 543 AM MDT TUE SEP 15 2026
KCOS AND KPUB: VFR CONDITIONS ARE EXPECTED OVER THE NEXT 24 HOURS.
GUSTY NORTHERLY WINDS POST FROPA WILL BE IN PLACE THROUGH THE START
OF THIS TAF PERIOD, WITH FREQUENT GUSTS TO AROUND 30 KNOTS EXPECTED.
WINDS SHIFT TO BECOME MORE SOUTHEASTERLY BEHIND THE FRONT THIS
AFTERNOON, AND REMAIN GUSTY, WITH GUSTS TO AROUND 20-25 KNOTS
EXPECTED. WINDS FINALLY LESSEN IN MAGNITUDE BY THIS EVENING, WITH
LIGHTER WINDS THEN PERSISTING INTO TOMORROW MORNING. IN ADDITION,
THICK MID TO HIGH LEVEL CLOUDS WILL BE IN PLACE THROUGH THIS TAF
PERIOD, WITH CLOUDS EVEN LOWERING THIS EVENING AND INTO TOMORROW
MORNING. OTHERWISE, DRY CONDITIONS ARE ANTICIPATED GIVEN OVERALL
STABLE CONDITIONS, THOUGH A ROGUE SHOWER CAN NOT BE RULED OUT,
PARTICULARLY FOR KCOS.
KALS: VFR CONDITIONS ARE EXPECTED OVER THE NEXT 24 HOURS. LIGHT
WINDS AT THE START OF THE THIS TAF PERIOD WILL INCREASE THIS
AFTERNOON AS SOME MIXING DEVELOPS WITHIN THE SAN LUIS VALLEY.
STRONGEST WINDS ARE EXPECTED LATE THIS AFTERNOON, WITH GUSTS UP TO
30 KNOTS EXPECTED. WINDS WILL START TO LESSEN THIS EVENING AS MIXING
LESSENS. ALONG WITH THAT, SHOWERS AND THUNDERSTORMS ARE ANTICIPATED
THIS AFTERNOON, WHICH COULD BRING BRIEF PERIODS OF GUSTY OUTFLOW
WINDS AND LIGHTNING. OUTSIDE OF THAT, THICK COVERAGE OF MID TO HIGH
LEVEL CLOUDS IS ANTICIPATED, WITH CLOUDS LOWERING SLIGHTLY HEADING
INTO THIS EVENING.
PUB WATCHES/WARNINGS/ADVISORIES
FLOOD WATCH FROM WEDNESDAY AFTERNOON THROUGH THURSDAY EVENING
FOR COZ067-068.
SHORT TERM...MOZLEY
LONG TERM...MOZLEY
AVIATION...SIMCOE
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