Area Forecast Discussion
Issued by NWS Goodland, KS

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FXUS63 KGLD 030010
AFDGLD

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GOODLAND KS
510 PM MST TUE FEB 2 2016

.UPDATE...
ISSUED AT 510 PM MST TUE FEB 2 2016

WINTER STORM AND BLIZZARD WARNINGS ALLOWED TO EXPIRE. WILL
CONTINUE TO HAVE SOME LIGHT SNOW AND REDUCED VISIBILITIES FOR
ANOTHER FEW HOURS BEFORE WINDS START TO SUBSIDE A BIT AND SNOW
COME TO AN END.

&&

.SHORT TERM...(THIS AFTERNOON THROUGH TONIGHT)
ISSUED AT 137 PM MST TUE FEB 2 2016

WATER VAPOR IMAGERY AND RAP 500 MB ANALYSIS SHOWS A STRONG UPPER
LEVEL LOW PRESSURE AND ASSOCIATED TROUGH SYSTEM POSITIONED OVER THE
CENTRAL PLAINS AND TAKING A NEGATIVE TILT AS THE SYSTEM BEGINS TO
LIFT INTO THE UPPER MIDWEST STATES.  THE STRONG CIRCULATION IS
EVIDENT BASED ON VIS/IR SATELLITE DATA AS THE UPPER LEVEL LOW
CONTINUES TO MOVE EASTWARD.  RADAR TRENDS SHOW A SMALL BAND OF
SNOWFALL CONTINUING TO BRING LIGHT SNOW FOR SOME PORTIONS OF EASTERN
COLORADO AND EXTREME WESTERN KANSAS...MAINLY ALONG THE INTERSTATE 70
CORRIDOR.  OTHERWISE...RADAR REFLECTIVITIES APPEAR TO BE TRENDING
DOWNWARD EARLY THIS AFTERNOON.

IN THE NEAR TERM UP TO LATE THIS AFTERNOON...THE WINTER STORM WILL
CONTINUE TO MOVE EASTWARD AND NEW SNOWFALL WILL CONTINUE TO LESSEN.
ADDITIONAL SNOWFALL AMOUNTS THIS AFTERNOON COULD REACH UP TO AN
INCH...BUT LOCALLY HEAVIER SNOW COULD OCCUR ALONG THE KS/CO BORDER
UP TO 2 INCHES.  RAP MODEL THETA LAPSE RATES/NEGATIVE EPV VALUES
INDICATE AN AREA OF MARGINALLY UNSTABLE AIR ALOFT BEHIND THE SURFACE
LOW PRESSURE SYSTEM WITH SOME FRONTOGENESIS PRESENT ALONG THE SAME
AXIS AS THE CURRENT RADAR TREND WITH THE SNOW BAND POSITIONED NEAR
THE INTERSTATE 70 CORRIDOR.  A SNOW BAND MOVING SOUTH OF INTERSTATE
80 ALONG HIGHWAY 283 COULD ALSO BRING SOME ADDITIONAL SNOW UP TO AN
INCH FOR NORTON AND HILL CITY AREAS THIS AFTERNOON BEFORE THE LOW
CENTER MOVES EAST ENOUGH TO END THE SNOW THREAT.

THE MAIN CONCERN FOR THE AFTERNOON AND EARLY EVENING HOURS IS THE
BLOWING SNOW AND REDUCED VISIBILITY THREAT.  STRONG SURFACE PRESSURE
GRADIENT OF 16-18 MB HAS BROUGHT STRONG WINDS BETWEEN 25 AND 35 MPH
WITH GUSTS UP TO 50 MPH AT TIMES...AND LATEST MODEL GUIDANCE DOES
NOT HAVE THIS GRADIENT LESSENING FOR THE AREA UNTIL AFTER MIDNIGHT
MST (1 AM CST) TONIGHT.  AS A RESULT...AREAS OF BLOWING SNOW WILL
CONTINUE TO CAUSE TRAVEL DIFFICULTIES...DESPITE THERE BEING NO
ADDITIONAL SNOW ACCUMULATIONS...ACROSS MUCH OF THE FORECAST AREA WITH
REDUCED VISIBILITIES IN AREAS OF BLOWING AND DRIFTING SNOW.  UNLESS
ABSOLUTELY NECESSARY...TRAVEL IS NOT ADVISED.

SURFACE PRESSURE GRADIENTS SHOULD STABILIZE AFTER MIDNIGHT MST (1 AM
CST) TONIGHT...WHICH SHOULD EFFECTIVELY END THE BLOWING SNOW AND
REDUCED VISIBILITY THREAT ACROSS THE FORECAST AREA.  STRONG COLD AIR
ADVECTION FROM NORTHERLY WINDS WILL BRING TEMPERATURES DOWN BETWEEN
THE SINGLE DIGITS AND THE MIDDLE TEENS.  COLD TEMPERATURES IN
COMBINATION WITH WIND GUSTS WILL CREATE WIND CHILLS BETWEEN 10 ABOVE
TO 10 BELOW ZERO OVERNIGHT INTO THE EARLY MORNING HOURS WEDNESDAY.

.LONG TERM...(WEDNESDAY THROUGH TUESDAY)
ISSUED AT 240 PM MST TUE FEB 2 2016

STRONG UPPER LOW TRANSITIONS EAST THROUGH THE WEEK WITH SHORTWAVE
RIDGING THURSDAY NIGHT/FRIDAY AND A SHORTWAVE TROUGH LATE FRIDAY
AFTERNOON AND FRIDAY NIGHT. LARGE SCALE RIDGING AMPLIFIES OVER THE
WESTERN US RESULTING IN A SHARP N-NW FLOW ACROSS THE PLAINS
THROUGH EARLY NEXT WEEK. THIS PATTERN MAY SUPPORT QUICK SHOTS OF
VERY LIGHT PRECIPITATION. OVERALL CHANCES OF MEASURABLE
PRECIPITATION THROUGH THESE PERIODS ARE MORE IN LINE WITH A
PREDOMINANTLY DRY FORECAST. THIS IS DUE TO EITHER DEEPER DRY AIR
MASS BETWEEN CLIPPERS OR LACK OF CONSISTENCY BETWEEN MODELS.

TEMPERATURES ARE PARTICULARLY TRICKY AS THIS PATTERN WOULD NORMALLY
SUPPORT A TREND TOWARDS SEASONAL TEMPERATURES. HOWEVER WITH THE
ONGOING SNOW EVENT AND AT LEAST HALF OF OUR FORECAST AREA
RECEIVING 10" OR MORE OF SNOW HIGH TEMPERATURES IN PARTICULAR ARE
LIKELY GOING TO BE LOWER THAN MODELS INDICATE. I TRENDED ALL HIGH
TEMPERATURES DOWN AND UNDERCUT ALL GUIDANCE THROUGH THESE PERIODS.
SNOW WILL ALSO AID IN RADIATIONAL COOLING DURING THE NIGHT...AND
ASSUMING WINDS REMAIN LIGHT (TO PREVENT LOW LEVEL MIXING) MODELS MAY
HAVE A WARM BIAS ON LOWS.

REGARDING WIND CHILLS WED NIGHT/THU MORNING...THE AIR MASS AND
ORIENTATION OF THE WINDS WEDNESDAY NIGHT MIGHT ACTUALLY LEAD TO MORE
MIXING WHICH COULD OFFSET THE EFFECTS OF SNOW/CLEARING SKIES AND
RESULTING WIND CHILLS MAY NOT ACTUALLY REACH -15F (ADVISORY). IT IS
CERTAINLY POSSIBLE FOR -10 TO -20F WIND CHILLS...BUT I THINK THIS
MAY BE A LOCALIZED THREAT. WITH ONGOING HAZARDS THERE ARE NO CURRENT
PLANS FOR A WIND CHILL ADVISORY FOR THIS PERIOD.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)
ISSUED AT 350 PM MST TUE FEB 2 2016

FOR KGLD AND KMCK...MVFR CONDITIONS EXPECTED FROM TAF ISSUANCE
THROUGH 5Z OR SO AS OUR WINTER STORM CONTINUES MOVING NORTHEAST
BRINGING A SLOW DECREASE IN THE WINDS AND SLOWLY IMPROVING
VISIBILITIES. FROM 6Z THROUGH THE REST OF THE PERIOD EXPECT WINDS
TO CONTINUE FROM THE NORTHWEST NEAR 10KTS WITH ONLY SOME MID LEVEL
CLOUDINESS.


&&

.GLD WATCHES/WARNINGS/ADVISORIES...
KS...NONE.
CO...NONE.
NE...NONE.
&&

$$

UPDATE...99
SHORT TERM...MK
LONG TERM...DR
AVIATION...99



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