133 
FXUS63 KGID 312207
AFDGID

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HASTINGS NE
407 PM CST THU JAN 31 2013

.SHORT TERM...TONIGHT AND FRIDAY.

WE REMAIN IN NORTHWEST FLOW ALOFT FOR THE SHORT TERM. THE SURFACE 
HIGH...CENTERED OVER THE NORTHERN PLAINS WILL SHIFT EAST...PLACING 
US WITHIN RETURN FLOW BY THE OVERNIGHT. 

TEMPERATURES SHOULD DROP SHARPLY TONIGHT AS WIND DROPS OFF...BUT 
STEADY OUT FOR THE OVERNIGHT AS WIND SHIFTS TO THE SOUTH AND 
INCREASES A BIT TOWARD DAWN. LOWS WILL LARGELY BE IN THE SINGLE 
DIGITS...BUT COULD HAVE BEEN COLDER IF NOT FOR THE RETURN FLOW. 
LOOKS LIKE WE ARE JUST FAR ENOUGH SOUTHWEST TO PRECLUDE ANY WIND 
CHILL ISSUES...AS WAS THE CASE EARLY THIS MORNING. 

MAINLY A TEMPERATURE FORECAST FOR FRIDAY AS SOUTHWEST FLOW FOLLOWS 
THE FETCH OF THE SNOW FIELD...WHICH SHOULD HAMPER HIGH TEMPERATURE 
WHERE THERE IS SNOW...SO I ESSENTIALLY LOWERED HIGHS OVER THE SNOW 
PACK...AND RAISED TEMPERATURES A BIT IN THE NORTHWESTERN 
CWA...INCLUDING ORD. SKY COVER WILL INCREASE ESPECIALLY TOWARD 
AFTERNOON AS ANOTHER SHORTWAVE TROUGH APPROACHES WITHING NORTHWEST 
FLOW. WE WILL BE NEAR THE ENTRANCE REGION OF AN UPPER LEVEL JET 
STREAK...WHICH COULD INDUCE SOME FLURRIES IN OUR NORTHERN CWA BY 
LATE AFTERNOON..ESPECIALLY NEAR AN UNUSUALLY ORIENTED WARM FRONT 
APPROACHING FROM THE WEST. MOST MODELS DO NOT INDICATE ANY SNOW 
FLURRY ACTIVITY...BUT THE NMM AND TO SOME EXTENT..THE GFS SHOW THIS 
TO BE A POSSIBILITY...SO INCLUDING THIS FOR THE VERY LATE AFTERNOON. 
WIND WILL INCREASE FROM THE SOUTH AHEAD OF THE WARM FRONT MOVING IN 
FROM THE WEST BY AFTERNOON...BUT AGAIN...THE FETCH OF THE WIND AND 
INCREASING CLOUDINESS WILL ROB US ONCE AGAIN OF A POTENTIALLY MORE 
MILD DAY FOR THE MAJORITY OF OUR CWA. 

.LONG TERM...FRIDAY EVENING THROUGH NEXT THURSDAY. FIRST OFF...VERY
FEW NOTICEABLE CHANGES WERE MADE FROM THE PREVIOUS FORECAST...AS THE
MAIN THEME CONTINUES TO BE PRECIPITATION-FREE CONDITIONS WITH THE
POSSIBLE EXCEPTION OF FRIDAY EVENING MAINLY IN THE NORTHEAST...AND
A SEVERAL-DAY STRETCH OF DECENT TEMPERATURES AVERAGING AROUND 10
DEGREES ABOVE NORMAL. 

STARTING OFF FRIDAY NIGHT...MAIN CHANGE FROM PREVIOUS FORECAST IS
THE INTRODUCTION OF A CHANCE/SLIGHT CHANCE OF FLURRIES DURING THE
EVENING HOURS MAINLY ACROSS OUR NORTHEAST 1/2...OR ROUGHLY
NORTHEAST OF A LOUP CITY-SUPERIOR LINE. THERE IS GOOD AGREEMENT
AMONGST VARIOUS 12Z MODELS SUCH AS THE NAM/GFS/ECMWF THAT A LOW
AMPLITUDE SHORTWAVE TROUGH WILL PASS EAST-SOUTHEAST OVER THE AREA
THROUGH THE NIGHT...FOCUSED WITHIN THE ENTRANCE REGION OF A 100+KT
JET AT 300MB. ALTHOUGH FORCING IS NOT GREAT WITH THIS WAVE...THERE
APPEARS TO BE INCREASING CHANCES OF AT LEAST LIGHT MEASURABLE SNOW
ALONG AN AXIS FROM NORTHEAST NEB INTO IA. AT THIS POINT...AM
THINKING THAT THESE MEASURABLE CHANCES SHOULD REMAIN JUST
NORTHEAST OF OUR CWA...BUT IT COULD BE A VERY CLOSE CALL
ESPECIALLY PER THE FORECAST REFLECTIVITY OF THE 12Z 4K WRF-NMM...AND
SOMETHING FOR NEXT FEW SHIFTS TO WATCH. IN THE MEANTIME...AT LEAST
WANTED TO GET THE NON-MEASURABLE FLURRY WORDING GOING...AS NAM
FORECAST SOUNDINGS SUGGEST A FAIRLY DEEP SATURATED LAYER ABOVE
850MB. FOR NOW WILL RUN WITH THE THINKING THAT ANY FLURRY
POTENTIAL WILL END ACROSS OUR CWA BY MIDNIGHT AS FORCING PASSES
MORE TO THE EAST. AT THE SURFACE...THE PASSING UPPER WAVE WILL
DRAG A SURFACE TROUGH ACROSS THE CWA THROUGH THE NIGHT...TURNING
BREEZES FROM THE WEST-NORTHWEST AT AROUND 10-15 MPH AS IT PASSES.
OFTEN...TEMPS TEND TO JUMP AT LEAST A FEW DEGREES AS THESE TROUGHS
PASS EVEN IN THE MIDDLE OF THE NIGHT...BUT GIVEN THIS IS STILL 3
PERIODS OUT WILL NOT ADVERTISE A NON-DIURNAL TEMP CURVE AT THIS
TIME. FOR ACTUAL LOWS...MADE LITTLE CHANGE WITH LOW 20S ADVERTISED ALL
AREAS...ALTHOUGH WOULD NOT BE SURPRISED TO SEE SOUTHEAST AREAS
OVER THE DEEPER SNOW COVER TRY DROPPING INTO THE TEENS BEFORE
MIXING BEHIND THE PASSING TROUGH LINE PICKS UP A BIT. ON ONE LAST
FRIDAY NIGHT NOTE...THE SREF VISIBILITY PROGS ARE SUGGESTING SOME
FOG DEVELOPMENT OVER THE MELTING SNOW PACK DURING THE NIGHT...BUT
THINKING THE WESTERLY WINDS BEHIND THE TROUGH AXIS SHOULD PROVE
UNFAVORABLE FOR ANY FOG WORTH MENTIONING. 

SATURDAY/SATURDAY NIGHT...CONFIDENCE IS RATHER HIGH IN A DRY 24
HOURS...AS MID LEVEL HEIGHTS START TO RISE A BIT AS MID LEVEL
TROUGHING MOVES OFF THE TO THE EAST. AS IT DOES SO...COULD SEE
ADDITIONAL SNOW BANDS DEVELOP NEAR/MAINLY EAST OF THE IA/NEB BORDER
DURING THE DAY...BUT THIS SHOULD STAY SQUARELY EAST OF OUR CWA. IN
THE LOW LEVELS...WESTERLY WINDS WILL PICK UP A BIT TOWARD BREEZY
TERRITORY DURING THE DAY...WITH SUSTAINED SPEEDS INCREASING TO AT
LEAST 15-20 MPH FOR A FEW HOURS. NEEDLESS TO SAY...THE BATTLE
BETWEEN THIS WARMING DOWNSLOPE FLOW AND THE LINGERING SNOW PACK
ACROSS MAINLY THE SOUTHEAST 1/2 OF THE CWA MAKES FOR A TRICKY AND
SOMEWHAT LOW CONFIDENCE HIGH TEMPERATURE FORECAST. FOR NOW...WILL
KEEP THEME SIMILAR TO PREVIOUS WITH MAINLY UPPER 40S/NEAR 50 WHERE
SNOW IS NONE/MINIMAL...AND ONLY LOW 40S IN SOUTHEAST COUNTIES
WHERE IT IS DEEPER. COULD EASILY SEE SOME 5+ DEGREE ERRORS HERE
DEPENDING ON HOW MUCH EFFECT THE SNOW FIELD HAS. ALTHOUGH NOT AS
STRONG AS DURING THE DAY...PERSISTENT STEADY WESTERLY BREEZES
OVERNIGHT SHOULD AGAIN HOLD LOW TEMPS UP IN THE LOW 20S MOST ALL
AREAS.

SUNDAY/SUNDAY NIGHT...FAIRLY UNEVENTFUL NORTHWEST FLOW ALOFT
CONTINUES...DESPITE A FEW VERY LOW AMPLITUDE SHORTWAVE TROUGHS
PASSING THROUGH THE FLOW. LOOKS AT THIS POINT LIKE ANY PRECIP
SHOULD FOCUS AT LEAST LEAST FEW HUNDRED MILES NORTHEAST AND/OR
SOUTH OF THE CWA. ALTHOUGH TEMPS AT 850MB SHOULD AVERAGE A BIT
WARMER THAN SATURDAY...BREEZES WILL LIKELY BE A BIT LIGHTER AND
MORE FROM THE SOUTHWEST. THE NET RESULT IS ALMOST IDENTICALLY
FORECAST HIGH TEMPERATURES TO SATURDAY IN MOST AREAS...WITH MAINLY
UPPER 40S...EXCEPT SLIGHTLY COOLER MID 40S OVER THE DEEPER SNOW. 

MONDAY/MONDAY NIGHT...THE REGION REMAINS UNDER NORTHWEST FLOW
BETWEEN A RIDGE BUILDING OVER THE WESTERN CONUS...AND THE NEXT IN
A PARADE OF CHANNELED SHORTWAVE TROUGHS SLIDING SOUTHEAST OUT OF
CANADA ACROSS THE DAKOTAS/IA. AGAIN...ANY PRECIPITATION ALONG THIS
SHORTWAVE AXIS SHOULD FOCUS AT LEAST A FEW HUNDRED MILES TO OUR
EAST...WHILE WE REMAIN IN THE MILDER AIR ON THE WARMER SIDE OF THE
UPPER JET. HIGH TEMPS FOLLOW CLOSELY TO ALLBLEND MODEL
CONSENSUS...WITH UPPER 40S MOST NEB ZONES AND LOW/MID 50S
SOUTHWEST. 

TUESDAY/TUESDAY NIGHT...THE FLOW ALOFT TRANSITIONS MORE ZONAL IN
THE WAKE OF THE VIGOROUS MIDWEST SHORTWAVE TROUGH THAT QUICKLY
DEPARTS TOWARD THE MID-ATLANTIC REGION. WITH LITTLE FORESEEABLE
CHANGE IN THE LOW LEVEL TEMPERATURE FIELDS...HIGH TEMPS ARE
FORECAST VERY SIMILAR TO MONDAY...RANGING FROM MID 40S NORTHEAST
TO LOW 50S SOUTHWEST. 

WEDNESDAY/WEDNESDAY NIGHT...THINGS START TO TURN A BIT MORE
INTERESTING ALOFT...AS BOTH THE ECWMF/GFS ARE IN SURPRISINGLY GOOD
AGREEMENT AS A SLOWLY DEEPENING BUT PROGRESSIVE SHORTWAVE TROUGH
DROPS OUT OF THE NORTHERN ROCKIES TOWARD THE NORTHERN/CENTRAL
PLAINS...ABUT AT LEAST FOR NOW OUR LOCAL PRECIP CHANCES APPEAR
QUITE MINIMAL WITH BETTER FORCING/MOISTURE FOCUSING OFF TO OUR
EAST/SOUTHEAST...ALTHOUGH IT COULD BE A CLOSE CALL ESPECIALLY PER
THE GFS. SOMETHING TO WATCH. MODEL CONSENSUS HIGHS ARE YET AGAIN A
NEAR COPY OF THE PREVIOUS FEW DAYS...UPPER 40S NORTHEAST TO MID
50S SOUTHWEST. 

THURSDAY...COULD SEE AT LEAST A SLIGHT COOL-DOWN BEHIND A SURFACE
COLD FRONT THAT PASSES THROUGH WEDNESDAY NIGHT...AND ITS VERY
POSSIBLE THAT CURRENTLY FORECAST TEMPS MAINLY IN THE UPPER 40S TO
LOW 50S COULD BE A BIT TOO WARM. ALOFT...THE AFOREMENTIONED UPPER
WAVE STARTS TO PASS EAST/SOUTHEAST DURING THE DAY...PRESUMABLY
KEEPING PRECIP CHANCES QUITE MINIMAL. 

LOOKING BEYOND THE OFFICIAL 7-DAY FORECAST PERIOD...THERE ARE
SUGGESTIONS THAT NEXT WEEKEND COULD HOLD OUR NEXT POTENTIALLY
DECENT PRECIP CHANCES...BUT PLENTY TO IRON OUT HERE.

&&

.PREV DISCUSSION... /ISSUED 1201 PM CST THU JAN 31 2013/ 

AVIATION...18Z KGRI TAF. CEILINGS SHOULD REMAIN VFR...EXCEPT SOME
CLOUDS COULD FLIRT WITH MVFR. WIND SPEEDS SHOULD DIMINISH WITH
TIME THIS AFTERNOON AS HEIGHT RISES RELAX. 

&&

.GID WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
KS...NONE.
&&

$$

SHORT TERM/AVIATION...HEINLEIN
LONG TERM...PFANNKUCH