Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS65 KBOU 122052
AFDBOU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
252 PM MDT FRI SEP 12 2014

.SHORT TERM...(THIS EVENING THROUGH SATURDAY)
ISSUED AT 142 PM MDT FRI SEP 12 2014

LOW STRATUS CLOUDS ACROSS THE LOWER FOOTHILLS AND PLAINS OF
EASTERN COLORADO ON FRIDAY AFTERNOON WILL CONTINUE TO ERODE
SLOWLY AND SKIES ARE EXPECTED TO BE CLEAR TO MOSTLY CLEAR AFTER
MIDNIGHT. RADIATIONAL COOLING FOLLOWING A COOL AFTERNOON
WILL RESULT CHILLY TEMPERATURES SATURDAY MORNING IN EASTERN
COLORADO. WITH PLENTIFUL GROUND MOISTURE AND NO REASON TO EXPECT
SUBSTANTIAL DECREASES IN DEWPOINTS SOME PATCHY FOG IS LIKELY.
FROST IS ALSO LIKELY FOR SOME LOW ELEVATION AREAS. BUT WORKING
AGAINST THE POTENTIAL FOR FROST IS WARMING ALOFT AND A WEAK LEE
TROF DEVELOPING AT THE SURFACE. THIS WILL REDUCE THE RISK OF FROST
NEAR THE FOOTHILLS FROM BOULDER COUNTY THRU DENVER AND DOUGLAS
COUNTIES. FOR EASTERN LARIMER COUNTY AND ACROSS THE HIGH PLAINS OF
NORTHEAST COLORADO, FROST IS LIKELY IN SOME VALLEYS AND LOW LYING
AREAS SATURDAY MORNING.

WARM ADVECTION ON SATURDAY COMBINED WITH SUNSHINE SHOULD ERODE THE
TEMPERATURE INVERSION DURING THE MORNING AND RESULT IN A STRONG
DIURNAL RANGE WITH AFTERNOON TEMPERATURES TOPPING 70 IN MOST
AREAS. IN THE MOUNTAINS AND IN A FEW LOCATIONS ALONG THE
FOOTHILLS THE WARMING MAY BE A LITTLE FASTER DUE TO MIXING OF THE
WESTERLIES TO THE SURFACE. NO PRECIPITATION IS EXPECTED BUT THERE
MAY BE A FEW FAIR WEATHER CUMULUS AND SOME TRANSITORY CIRRUS
CLOUDS ESPECIALLY NEAR THE MOUNTAINS.

.LONG TERM...(SATURDAY NIGHT THROUGH FRIDAY) ISSUED AT 245 PM MDT
FRI SEP 12 2014

THE WARMUP WILL CONTINUE THROUGH MONDAY WITH WESTERLY FLOW ALOFT
AND A LEE TROUGH DEVELOPING IN EASTERN COLORADO. THERE WILL BE
JUST ENOUGH MOISTURE FOR SCATTERED THUNDERSTORMS OVER THE HIGH
COUNTRY BOTH SUNDAY AND MONDAY. HIGH PRESSURE BUILDING DOWN FROM
MONTANA WILL HELP CREATE A BAROCLINIC ZONE...AND IT LOOKS LIKE
SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE OVER FAR NORTHEAST
COLORADO SUNDAY NIGHT INTO MONDAY. THE COVERAGE COULD BE MORE
WIDESPREAD...BUT FOR NOW THE BEST CHANCE WILL BE LINCOLN TO LOGAN
COUNTY AND EASTWARD AND WILL KEEP STORMS ONLY IN THE FAR
NORTHEAST. THE HIGH PRESSURE WILL BRING A COOL DOWN...SO MONDAY
WILL BE ABOUT 10 DEGREES COLDER THAN SUNDAY. THE COOLDOWN WILL BE
SHORT LIVED HOWEVER...AND ANOTHER LEE TROUGH WILL DEVELOP ON
TUESDAY AND PERSIST INTO FRIDAY. TEMPERATURES WILL REACH THE 80S
ON WEDNESDAY AND THURSDAY ACROSS NORTHEAST COLORADO.

MIDWEEK THE UPPER PATTERN WILL HAVE RIDGE OVER THE GREAT BASIN
WITH AN UPPER LOW MOVING INTO THE PACIFIC NORTHWEST. INCREASING
SOUTHWESTERLY FLOW THURSDAY AND FRIDAY WILL DRAW MOISTURE ACROSS
THE ROCKIES ONCE AGAIN...SO WILL INCREASE PRECIPITATION ACROSS THE
FORECAST AREA ON FRIDAY...WITH SCATTERED STORMS OVER THE MOUNATAIN
AND ISOLATED STORMS ON THE PLAINS. WHILE NOT PART OF THIS FORECAST
THE COVERAGE OF STORMS WILL LIKELY INCREASE ACROSS THE PLAINS
FRIDAY NIGHT AS MONSOON MOISTURE SPILLS EASTWARD.

&&

.AVIATION...(FOR THE TAFS THROUGH 18Z SATURDAY MORNING)
ISSUED AT 924 AM MDT FRI SEP 12 2014

STRATUS WILL CONTINUE TO THIN THIS EVENING AND GIVE WAY TO CLEAR
OR MOSTLY CLEAR SKIES DURING THE LATE NIGHT AND MORNING. WINDS
WILL BE LIGHT AND THERE MAY BE SOME LOCALIZED AREAS OF FOG AROUND
SUNRISE. A FEW CLOUDS MAY DEVELOP SATURDAY, BUT NO PRECIPITATION
OR CONVECTIVE WINDS ARE EXPECTED.


&&

.BOU WATCHES/WARNINGS/ADVISORIES...
FROST ADVISORY FROM 3 AM TO 7 AM MDT SATURDAY FOR COZ038-042>051.

&&

$$

SHORT TERM...GIMMESTAD/KELSCH
LONG TERM...RTG
AVIATION...GIMMESTAD/KELSCH


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.