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000
FXUS63 KOAX 092307
AFDOAX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
607 PM CDT SUN MAR 9 2014

.SHORT TERM...(TONIGHT THROUGH WEDNESDAY)
ISSUED AT 245 PM CDT SUN MAR 9 2014

A POTENTIAL NARROW WIND DRIVEN SNOW BAND BRIEFLY SETTING UP OVER
NRN FORECAST AREA TUESDAY MAIN SENSIBLE WEATHER ISSUE IN SHORT
TERM...OTHERWISE FOCUS IS ON TEMPERATURES.

GENERALLY KEPT TEMPERATURES TONIGHT NEAR GUIDANCE AS A WEAK SFC
TROUGH MOVING TOWARD A TEKAMAH-LINCOLN LINE BY 12Z MONDAY COULD
PROVIDE ENOUGH OF A DECREASE IN WINDS TO ALLOW READINGS TO FALL
OFF AS TODAYS MIXING HAS LOWERED DWPTS INTO THE 20S/LOWER 30S.
ALTHOUGH MIXING WILL BE MUCH LESS TOMORROW BECAUSE OF THIS
TROUGH...ANY COOL ADVECTION ASSOCD WITH IT WAS MINIMAL. PLUS
MORNING TEMPERATURE INVERSION WILL BE SHALLOW AND H925 TEMPS WERE
FORECAST TO BE 5-10 DEG C WARMER THAN THIS MORNING. THUS BOOSTED
MOST TEMPERATURES A FEW DEGREES.

MODELS HAVE DELAYED ONSET OF BETTER FORCING/QPF JUST A TOUCH SO
BACKED OFF PRECIP CHCS NRN ZONES MON NIGHT. A WIND-DRIVEN
FRONTOGENETICAL PRECIP BAND APPEARS QUITE PROBABLE FROM MID-LATE
TUE MORNING INTO THE AFTERNOON HOURS. HOWEVER...DIFFERENCES
EXISTED AMONG 12Z MODES. GFS SET IT UP OVER NERN ZONES...NAM
SAGGED IT SOUTH FAIRLY EVENLY FROM W TO EAST ACROSS NRN 1/2 WHILE
ECMWF DROPPED IT MOSTLY SW OF THE AREA BY AFTN. LEANED MORE TOWARD
NAM/S COMPROMISE SOLUTION. FORECAST SOUNDINGS INDICATED PRECIP
LIKELY TO SWITCH FAIRLY QUICKLY TO SNOW WHEN FORCING BECOMES
STRONG ENOUGH...ALTHOUGH MILD-ISH BOUNDARY LAYER TEMPS CNTRL/SRN
ZONES COULD LIMIT ACCUMULATIONS THERE AND POSSIBLY LINGER
RAIN/SNOW MIX A BIT LONGER PARTS OF THE NORTH.
NONETHELESS...PENCILED IN A 1-2 INCH BAND ACROSS NRN FA AS
FRONTOGENESIS POTENTIAL LOOKED GOOD. ADJUSTED TEMPS DOWN SOME
NORTH TO ACCOUNT FOR PRECIP/FORCING COOLING TEMPS TOWARD WETBULB
IN THE MORNING. PRETTY BLUSTERY AS WELL AS COLD ADVECTION MIXES
DOWN H85 WINDS THAT WERE FORECAST TO BE 40-55KTS PER VARIOUS
MODELS. QUESTION TUESDAY EVENING IS WHETHER THIS PRECIP BAND WILL
CONTINUE SAGGING SOUTH OR WHETHER IT WILL JUST WEAKEN IN PLACE AS
SECONDARY QPF MAX DEVELOPS SE OF OUR AREA. THUS FOR NOW KEPT POPS
IN MODESTLY HIGH CHANCE RANGE SOUTHERN ZONES.

TRAILING WAVE BEHIND TROUGH ON WED COULD BRING LINGERING CLOUDS
SO INCREASED INTO PTCLDY RANGE FOR NOW...BUT IF CLOUDS WOULD
LINGER LONGER/BE MORE EXTENSIVE...COULD SEE SOME READINGS
STRUGGLING TO CLIMB ABOVE 40.

.LONG TERM...(WEDNESDAY NIGHT THROUGH SUNDAY)
ISSUED AT 245 PM CDT SUN MAR 9 2014

THROUGH THE EXTENDED FORECAST PERIOD...MODELS SHOW A CONTINUATION OF
A WESTERN RIDGE AND AN EASTERN TROUGH.  STARTS OUT WITH LESS
AMPLITUDE BUT BY LATE IN THE PERIOD A NORTH COLD FLOW STEEPER
AMPLITUDE.  THUS THE EXTENDED PERIOD WILL START OFF DRY AND
MILD...AT LEAST THROUGH THURSDAY...THEN A CHANCE OF PRECIPITATION
RETURNS BY THE WEEKEND IN THE FORM OF A WAVE EMBEDDED IN THE
PERSISTENT NORTHWEST FLOW.  IN ADVANCE OF THE APPROACHING
WAVE...SATURDAY WILL BE SLIGHTLY COOLER DUE TO INCREASED CLOUD COVER
AND PROBABLY LESS FAVORABLE MIXING AS WINDS BECOME MORE NORTHERLY OR
NORTHEASTERLY.  THIS WILL CONTINUE INTO SUNDAY WITH OVERCAST SKIES
AND LIKELY A MIX OF LIGHT RAIN AND SNOW PHASING WITH NORMAL DIURNAL
TEMPERATURE RISES AND FALLS.  AFTER RUNNING ON THE MILD SIDE FOR A
FEW DAYS...SUNDAY HIGHS...WHICH IS ALREADY MID MARCH...WILL LIKELY
ONLY CLIMB INTO THE 40S.  THE EXTENDED DISCUSSION IS BASED PRIMARILY
ON A COMBINATION OF 12Z GFS/ECMWF MODEL GUIDANCE...WHICH STILL
SEEMED TO BE IN GENERAL AGREEMENT.

&&

.AVIATION...(00Z TAFS FOR KOFK...KLNK AND KOMA.)
ISSUED AT 605 PM CDT SUN MAR 9 2014

VFR CONDITIONS ARE EXPECTED THROUGH MONDAY AFTERNOON. SCATTERED TO
BROKEN HIGH CLOUDS ARE FORECAST WITH WEST OR SOUTHWEST WINDS NEAR
10KT OVERNIGHT BECOMING NORTHWEST BY 15Z MONDAY.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
IA...NONE.
&&

$$

SHORT TERM...CHERMOK
LONG TERM...MEYER
AVIATION...DERGAN