Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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000
FXUS63 KOAX 302326
AFDOAX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
526 PM CST FRI JAN 30 2015

.SHORT TERM...(TONIGHT THROUGH MONDAY)
ISSUED AT 310 PM CST FRI JAN 30 2015

PCPN TYPE AND PCPN AMOUNTS WILL BE THE MAIN CONCERN IN THIS PERIOD...
ESPECIALLY FROM LATE TONIGHT INTO SATURDAY EVENING. PCPN SHOULD TURN
TO MOSTLY SNOW BY LATE SATURDAY NIGHT ALL AREAS.

WATER VAPOR LOOP AND LATEST RAP MODEL INITIALIZATIONS SHOWED A
CLOSED LOW OVER THE CALIFORNIA/ARIZONA BORDER REGION EARLY THIS
AFTN. THIS WILL DROP SOUTHWARD INTO MEXICO THROUGH SUNDAY. SOME
SHORTWAVE ENERGY WILL MOVE NORTHEAST OUT OF THIS TROUGH THOUGH AND
MOVE UP INTO THE CENTRAL PLAINS LATER TONIGHT AND SATURDAY. SURFACE
ANALYSIS EARLY THIS AFTERNOON SHOWED MODEST SOUTH/SOUTHWEST WINDS
SPREADING ACROSS OUR AREA. CLOUDS WILL THICKEN AND LOWER...WITH
LIGHT PCPN PROBABLY MOVING INTO OUR SOUTHERN COUNTIES BEFORE 12Z.
HAVE LOWS FORECAST IN THE UPPER 20S NORTH AND LOWER 30S SOUTH. THE
PCPN TYPE MAY BE A MIX LATER TONIGHT INTO SATURDAY.

DID MAKE SOME MODIFICATIONS TO SNOW AMOUNTS...MAINLY FOR SATURDAY
NIGHT INTO SUNDAY MORNING. ON SATURDAY...IT APPEARS THAT IF WE GET
ANY ACCUMULATIONS...THEY WOULD BE LIGHT AND MAINLY ON GRASSY AREAS
FOR OUR SOUTHERN ZONES. FARTHER NORTH...PCPN CHANCES WILL BE
INCREASING IN THE AFTERNOON BUT AMOUNTS WOULD BE LIGHTER. THE NAM
FORECAST SOUNDINGS STILL APPEARED TOO COLD...AND WENT CLOSER TO A
BLEND OF SOME OF THE OTHER MODELS...ESPECIALLY THE SREF. NORTH
WINDS WILL SPREAD ACROSS THE AREA SATURDAY NIGHT...AND AS THE
COLUMN COOLS...PCPN WILL CHANGE TO MOSTLY SNOW AND WILL START TO
ACCUMULATE. A SEPARATE SYSTEM WILL DROP QUICKLY SOUTHEAST IN THE
NORTHWEST FLOW SATURDAY NIGHT...PROVIDING GOOD LIFT IN A FAVORABLE
ENVIRONMENT FOR SNOW FROM THE NORTHERN PARTS OF NORTHEAST NEBRASKA
INTO WEST CENTRAL IOWA. INCREASED SNOW AMOUNTS FOR AREAS ALONG AND
NORTH OF HIGHWAY 20. IT APPEARS ANOTHER LOBE OF LIFT WILL DROP
DOWN OVER PARTS OF THE AREA SUNDAY AFTERNOON...SO KEPT SOME
MENTION OF LIGHT SNOW GOING UNTIL SUNDAY NIGHT. SUNDAY NIGHT IS
EXPECTED TO BE COLD WITH DECREASING CLOUDS AND DECREASING WINDS.
LOWS SHOULD DROP TO THE SINGLE DIGITS AND WE MAY SEE SOME BELOW
ZERO NUMBERS FROM HARTINGTON AND WAYNE TOWARD TEKAMAH AND HARLAN.

FAST NORTHWEST FLOW IN THE MID LEVELS WILL BE IN PLACE FOR MONDAY
AND IT DOES APPEAR THAT A SHORTWAVE TROUGH COULD MOVE THROUGH OUR
AREA. MODELS...ESPECIALLY THE 12Z GFS...BRING SOME LIGHT SNOW IN
FOR MONDAY AFTERNOON. COULD NOT ARGUE WITH THAT TOO MUCH SO WENT
WITH A SLIGHT CHANCE OF LIGHT SNOW FOR NOW AND WILL FINE TUNE THAT
LATER. MEASURABLE LIGHT AMOUNTS SEEM POSSIBLE...ESPECIALLY IN
WESTERN IOWA MONDAY. HIGHS MONDAY WILL BE MOSTLY 20S.

.LONG TERM...(MONDAY NIGHT THROUGH FRIDAY)
ISSUED AT 310 PM CST FRI JAN 30 2015

SOME MILDER AIR WILL SPREAD IN BRIEFLY FOR TUESDAY...WITH HIGHS
REACHING THE UPPER 30S AND LOWER 40S. DID NOT WANT TO GET TOO
OPTIMISTIC AT THIS POINT FOR HIGHS. ANOTHER SURGE OF COLDER AIR
WILL DROP DOWN INTO THE AREA BY TUESDAY NIGHT. SOME LIGHT SNOW
SEEMS POSSIBLE BASED ON THE PATTERN...PLUS BOTH THE 12Z GFS AND
ECMWF SHOW A BIT OF SNOW.

TEMPERATURES WEDNESDAY AND THURSDAY WILL BE BELOW NORMAL...THEN
CLOSER TO NORMAL BY FRIDAY AS SOUTH OR SOUTHWEST WINDS INCREASE.

&&

.AVIATION...(00Z TAFS FOR KOFK...KLNK AND KOMA.)
ISSUED AT 522 PM CST FRI JAN 30 2015

VFR CONDITIONS BECOME MVFR THROUGH THE PERIOD WITH RAIN DEVELOPING
INITIALLY...THEN MIXING WITH OR CHANGING TO SNOW TOWARD THE END OF
THE PERIOD. COULD SEE RAIN CHANCES BEGIN IN THE KLNK AREA BY
10Z...AND 14-15Z AT KOMA/KOFK. SNOW CHANCES INCREASE BY 20-21Z.

&&

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

$$

SHORT TERM...KERN/MILLER
LONG TERM...MILLER
AVIATION...DEWALD



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