Area Forecast Discussion
Issued by NWS Bismarck, ND

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FXUS63 KBIS 191758
AFDBIS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
1158 AM CST FRI DEC 19 2014

.UPDATE...
ISSUED AT 1149 AM CST FRI DEC 19 2014

FOG AND STRATUS CONTINUES ACROSS THE NORTH AND PORTIONS OF THE EAST
CENTRAL TODAY. WITH LITTLE TO MOVE THE STATUS AROUND WILL OPT FOR
PERSISTENCE AND KEEP CLOUDS AND FOG IN THROUGH THE AFTERNOON AND
INTO THE EVENING AS WELL.

UPDATE ISSUED AT 943 AM CST FRI DEC 19 2014

WILL EXTEND AREAS OF FOG FOR A FEW MORE HOURS NORTHWEST. OTHERWISE
AS FOG LIFTS PATCHY FREEZING DRIZZLE HAS DIMINISHED. TEMPERATURES
AND WINDS LOOK OK.

UPDATE ISSUED AT 640 AM CST FRI DEC 19 2014

VISIBILITIES IN FOG NORTH AND EAST CONTINUE TO VARY FROM TIME TO
TIME AND PLACE TO PLACE. THERE WAS GENERAL IMPROVEMENT IN
VISIBILITIES. THE DENSE FOG ADVISORY NORTHWEST WAS ALLOWED TO
EXPIRE. A SPECIAL WEATHER STATEMENT HAS BEEN ISSUED FOR FOG...SOME
OF IT LOCALLY DENSE.

&&

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 405 AM CST FRI DEC 19 2014

FOG AND LOW CLOUDS ARE THE MAIN CONCERNS IN THE SHORT TERM.

CURRENT SURFACE ANALYSIS  INDICATES LOW PRESSURE IN THE LEE OF THE
ROCKIES WITH A TROUGH EXTENDING FROM NORTHERN ALBERTA TO THE WESTERN
DAKOTAS. AT UPPER LEVELS A BROAD TROUGH EXTENDED OVER THE CANADIAN
AND NORTHERN US PLAINS. A RATHER SHARP WESTERN EDGE TO LOW CLOUDS
EXTENDED FROM NEAR WILLISTON ACROSS LAKE SAKAKAWEA TO EAST OF
BISMARCK. MID LEVEL CLOUDS WERE ALONG AND SOUTH/WEST OF THE MISSOURI
RIVER AT 3 AM CST. EXPECT THE LOW CLOUDS TO CLEAR FROM WEST TO EAST
ACROSS SOUTH CENTRAL NORTH DAKOTA...BUT LATEST HRRR MODEL INDICATES
CLOUDS HANGING IN ACROSS THE NORTH. A SHORTWAVE ALOFT ON THE WESTERN
EDGE OF THE UPPER TROUGH WAS DIGGING SOUTHEAST ACROSS SOUTHWESTERN
NORTH DAKOTA INTO WESTERN SOUTH DAKOTA...AND MAY BE THE DRIVING
FORCE FOR THE MID CLOUDS MOVING IN AND THE LOWER CLOUDS DISSIPATING.

DENSE FOG STILL EVIDENT AT WILLISTON...ALTHOUGH VISIBILITIES HAVE
IMPROVED IN THE LAST HOUR AT OTHER PLACES WITHIN THE DENSE FOG
ADVISORY...SUCH AS TIOGA/STANLEY/CROSBY. BUT MINOT VISIBILITY IS ON
A DOWNWARD TREND. THUS WILL KEEP THE DENSE FOG ADVISORY GOING UNTIL
6 AM AND THEN RE-EVALUATE.

OTHERWISE WARM ADVECTION TODAY SHOULD ALLOW TEMPERATURES TO RISE
INTO THE MID/UPPER 20S NORTH AND EAST OF THE MISSOURI RIVER...AND
WELL INTO THE MID AND UPPER 30S SOUTH AND WEST OF THE RIVER. TONIGHT
A SHORTWAVE RIDGE ALOFT ENTERS WESTERN NORTH DAKOTA AHEAD OF AN
UPPER LEVEL SHORTWAVE MOVING EASTWARD OUT OF THE ROCKIES. LOWS
TONIGHT SHOULD REMAIN ABOVE AVERAGE IN THE TEENS AND LOWER 20S.

.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 405 AM CST FRI DEC 19 2014

THE SHORT TERM ISSUES...LOW CLOUDS AND LIGHT PRECIPITATION
INCLUDING FREEZING RAIN/FREEZING DRIZZLE AND PATCHY FOG...
CONTINUE INTO THE LONG TERM AS THE FORECAST AREA REMAINS UNDER A
MEAN TROUGH SURFACE AND ALOFT. WAVES COMING THROUGH SATURDAY AND
AGAIN SUNDAY ARE WEAK AND MOISTURE STARVED. HOWEVER...WITH WARMER
AIR ADVECTING IN ALOFT AHEAD OF EACH WAVE THERE IS A RISK OF
FREEZING RAIN SATURDAY MORNING / FREEZING DRIZZLE WITH LOW STRATUS
CLOUDS. WARM ADVECTION CONTINUES CHANGING ANY PRECIPITATION IN THE
SOUTHWEST TO RAIN WITH SURFACE TEMPERATURES INTO THE MID 30S
SATURDAY AFTERNOON. A SIMILAR SCENARIO SETS UP FOR SUNDAY.

THE MID LEVEL LOW...CUTTING OFF OVER WISCONSIN...WILL BLOCK THE
FLOW PATTERN UP ACROSS THE NORTHERN PLAINS. THIS WILL ALLOW COLDER
AIR TO SPILL IN FOR TUESDAY. LOOKING AHEAD TO CHRISTMAS DAY...THE
LOW TO THE EAST...AND HIGH PRESSURE MOVING ACROSS THE NORTHERN
ROCKIES...ALLOW A STEADY FLOW OF COLDER AIR INTO NORTH
DAKOTA...THAT WILL CONTINUE AT LEAST THROUGH THE HOLIDAY WEEKEND.
STILL THOUGH...TEMPERATURES ARE CLOSE TO WHAT IS NORMAL FOR THE
END OF DECEMBER...AROUND 20 DAYTIME AND SINGLE DIGITS ABOVE AND
BELOW AT NIGHT. PERIODS OF FLURRIES...MAYBE A FEW TENTHS INCH OF
SNOW AT MOST EVERY OTHER DAY OR SO...LOOKS TO OCCUR THROUGH THE
CHRISTMAS HOLIDAY WEEKEND.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SATURDAY AFTERNOON)
ISSUED AT 1149 AM CST FRI DEC 19 2014

WILL LET PERSISTENCE DICTATE THE FORECAST WHERE LOW CLOUDS AND
AREAS OF FOG REMAIN AT NOON TODAY. KEPT LOW IFR FROM KMOT-KJMS
WHERE SHALLOW COOL AIR WILL REMAIN. KISN-KBIS WILL REMAIN ON THE
EDGE WITH SOME UNCERTAINTY AS TO THE EXTENT OF CLOUDS AND FOG
THAT RETURN AFTER DARK. WITH LITTLE IN THE WAY OF BROAD SCALE
WINDS SEE SHALLOW COOL BOUNDARY LAYER CONTRIBUTING TO STRATUS AND
FOG. KDIK PROBABLY THE ONLY ONE IN THE CLEAR WITH VFR EXPECTED.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

UPDATE...WAA
SHORT TERM...JV
LONG TERM...JPM
AVIATION...WAA





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