Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 100230
AFDBOU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
830 PM MDT WED JUL 9 2014

.UPDATE...
ISSUED AT 814 PM MDT WED JUL 9 2014

EVENING CONVECTION HAS DIMINISHED RAPIDLY DURING THE PAST HOUR AND
HAVE CANCELLED THE SEVERE THUNDERSTORM WATCH. STILL SOME LINGERING
STORMS OVER FAR EASTERN LINCOLN COUNTY ALONG LEADING EDGE OF
OUTFLOW ACROSS SOUTH CENTRAL LINCOLN COUNTY. FURTHER WEST STILL
SOME WEAKER SHOWERS OVER MOUNTAINS AND FOOTHILLS WITH MAIN IMPACT
OF GUSTY WINDS WITH THE SHOWERS. MOST OF THE ACTIVITY WILL END
BEFORE MIDNIGHT. HAVE ADJUSTED ZONES TO REMOVE WATCH AND ADJUST
POPS FOR LATEST TRENDS.

&&

.SHORT TERM...(THIS EVENING THROUGH THURSDAY)
ISSUED AT 308 PM MDT WED JUL 9 2014

POCKETS OF MOISTURE CARRIED ALONG BY NORTHWEST FLOW ALOFT...
TOGETHER WITH HOT TEMPERATURES AND A SMATTERING OF OUTFLOW
BOUNDARY INTERACTIONS ALL RESPONSIBLE FOR THE SCATTERED T-STORMS
FORMING ALONG THE FRONT RANGE AT THIS HOUR. STORMS PAST COUPLE OF
HOURS HAVE STRUGGLED TO SUSTAIN THEMSELVES AFTER MOVING OFF THE
HIGHER TERRAIN SUCH AS THE NORTHERN FOOTHILLS AND CHEYENNE RIDGE.
STRONGEST CONVECTION OCCURRING UP NEAR THE WY BORDER WHEN SFC
DEWPOINTS IN THE LOWER 60S AFTER A SURGE OF LOW LEVEL MOISTURE
FROM STORMS PASSING OVER THE FAR NORTHEAST CORNER EARLIER THIS
MORNING. IN THE PAST COUPLE OF HOURS...A WEAK SFC CYCLONE HAS
FORMED JUST EAST-SOUTHEAST OF DENVER WHICH CAUSED GUSTY NORTHEAST
WINDS IN THE AREA TO SHIFT TO A DRIER SELY COMPONENT OFF THE
PALMER DIVIDE. SPC RECENTLY EXPANDED THEIR SLIGHT RISK AREA A BIT
FARTHER WEST TO JUST EAST OF THE DENVER AREA. WILL NEED TO WATCH
FOR STG IF NOT ISOLATED SEVERE STORMS FORMING ON THE EAST-
NORTHEAST SIDE OF THIS CYCLONE IN THE NEXT 1-2 HOURS. HAIL UP TO
AN INCH IN DIAMETER AND GUSTS TO 60 MPH MAIN THREATS. FRONT RANGE
URBAN CORRIDOR COMMUNITIES MAY MISS OUT ON THE STG STUFF WITH
DRIER AIR EXPECTED TO FUNNEL DOWN OFF THE FOOTHILLS.

TONIGHT...STORMS WILL CONTINUE TO MARCH SOUTHEASTWARD AND POSSIBLY
BECOME MORE EXTENSIVE IN COVERAGE ALONG A CONVERGENCE LINE FROM
ELBERT TO HAXTUN. COULD SEE A FEW STORMS GO SEVERE ALONG THIS
AXIS THRU THE EARLY EVENING HOURS. BY MID TO LATE EVENING...MOST
OF THIS STORM ACTIVITY SHOULD MOVE OUT AS TEMPS COOL AND THE SFC
BASED INVERSION SETS UP. HOWEVER...MID AND HIGH LEVEL MOISTURE
WRAPPING AROUND THE TOP OF THE UPPER RIDGE TO OUR SOUTH SHOULD
KEEP SKIES AT LEAST PARTLY CLOUDY OVERNIGHT AND MIN TEMPERATURE ON
THE VERY MILD SIDE.

THURSDAY...THE UPPER RIDGE SHIFTS A BIT FARTHER EAST SITTING
SQUARELY OVER CENTRAL NEW MEXICO PLACING THE FORECAST AREA UNDER A
MOISTENING WESTERLY FLOW ALOFT. SUBTROPICAL MOISTURE TO OUR WEST
GRADUALLY MAKES ITS WAY AROUND THE TOP OF THE RIDGE CAUSING SKIES
TO FILL WITH MID AND HIGH CLOUDS BY MIDDAY. COULD SEE STORMS
FIRING EARLIER IN THE HIGH COUNTRY TOMORROW WITH THE AVAILABLE
MOISTURE. EAST OF THE MTNS...BOUNDARY LAYER MOISTURE LACKING
DURING THE MORNING HOURS...BUT THROUGH THE DAY...MODELS SHOW A
MODEST RECOVERY IN LOW-LEVEL MOISTURE WITH A SHIFT TO AN EASTERLY
SFC WIND PATTERN. STORM CHANCES EAST OF THE MTNS LOOKS ABOUT THE
SAME AS TODAY...ROUGHLY A 20 TO 30 PCT CHANCE DURING THE DAY.
LASTLY...TEMPS ON THURSDAY SIMILAR TO THOSE TODAY.

.LONG TERM...(THURSDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 308 PM MDT WED JUL 9 2014

UPPER RIDGE OVER COLORADO FRIDAY WITH SUBTROPICAL MOISTURE
STREAMING NORTHWARD ACROSS THE REGION. PRECIPITABLE WATER VALUES
INCREASE...HIGHEST ACROSS THE PLAINS WHERE MODELS SHOW A THETA-E
RIDGE. IN ADDITION...MID LEVEL SHORTWAVE MOVING ACROSS WYOMING
PUSHES A FRONT INTO NORTHEAST COLORADO DURING THE AFTERNOON.
COMBINATION OF MOISTURE AND LIFT TO PRODUCE A GOOD CHANCE OF
THUNDERSTORMS DURING THE AFTERNOON AND EVENING. LOCALLY HEAVY RAIN
POSSIBLE WITH SOME OF THE STORMS. FLOW ALOFT FAIRLY LIGHT...SO
STORMS COULD ALSO BE SLOW MOVING. SOME COOLING EXPECTED BEHIND
FRONT ACROSS PLAINS. RIDGE BEGINS TO RETROGRADE SATURDAY AND
BUILDS ACROSS GREAT BASIN. FLOW ALOFT ACROSS COLORADO BECOMES
NORTHWEST. THE MAIN PUSH OF SUBTROPICAL MOISTURE SHIFTS INTO
UTAH. STILL ENOUGH MOISTURE ACROSS THE AREA FOR A CHANCE OF
AFTERNOON AND EVENING THUNDERSTORMS...MAINLY OVER THE MOUNTAINS
AND FOOTHILLS. NORTHWEST FLOW ALOFT CONTINUES SUNDAY AS RIDGE
CONTINUES TO BUILD ACROSS THE GREAT BASIN. THOUGH MOST OF THE
SUBTROPICAL WILL BE WEST OF COLORADO...ENOUGH MOISTURE ACROSS THE
AREA FOR A CHANCE OF THUNDERSTORMS DURING THE AFTERNOON AND
EVENING. AGAIN BEST CHANCE FOR STORMS TO BE ACROSS THE MOUNTAINS
AND FOOTHILLS. TEMPERATURES TO BE NEAR SEASONAL AVERAGE DURING
THE WEEKEND.

FOR THE LATER DAYS...MONDAY THROUGH WEDNESDAY...NORTHWEST FLOW
ALOFT TO CONTINUE THROUGH THE PERIOD. ENOUGH SUBTROPICAL MOISTURE
ACROSS THE AREA FOR A CHANCE OF AFTERNOON AND EVENING
THUNDERSTORMS. BOTH GFS AND ECMWF INDICATE A FRONT MOVING INTO
NORTHEAST COLORADO OVERNIGHT MONDAY...WITH A SURFACE HIGH BUILDING
INTO THE AREA TUESDAY MORNING. THIS SHOULD HELP REPLENISH THE LOW
LEVEL MOISTURE AND PROVIDE FOR A BETTER CHANCE FOR THUNDERSTORMS
TUESDAY AND WEDNESDAY. SEASONAL TEMPERATURES EXPECTED
MONDAY...WITH SOME COOLING BY WEDNESDAY.

&&

.AVIATION...(FOR THE TAFS THROUGH 06Z THURSDAY EVENING)
ISSUED AT 814 PM MDT WED JUL 9 2014

OUTFLOW FROM WEAK CONVECTION IN THE FOOTHILLS RESULTING IN SOME
GUSTY WEST TO SOUTHWEST WINDS OVER TERMINALS. WINDS WILL GRADUALLY
RELAX AND RETURN TO DRAINAGE LATER THIS EVENING.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

UPDATE...ENTREKIN
SHORT TERM...BAKER
LONG TERM...D-L
AVIATION...ENTREKIN



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