Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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FXUS63 KOAX 250008
AFDOAX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
708 PM CDT SUN MAY 24 2015

.SHORT TERM...(TONIGHT)

UPPER LOW CONTINUES TO SPIN ACROSS THE CENTRAL ROCKIES. A VERY WEAK
WARM FRONT HAD LIFTED INTO THE FORECAST AREA RESULTING IN WIDESPREAD
SHOWERS THIS MORNING...BUT THOSE HAVE LIFTED NORTH OF THE AREA.
ADDITIONAL SHOWERS WERE MOVING INTO SOUTHEAST NEBRASKA LATE THIS
AFTERNOON FROM NORTHEAST KANSAS...AND THIS WILL THE PRIMARY ACTIVITY
THROUGH THE EVENING. INSTABILITY IS AGAIN MARGINAL TODAY AND THIS
WILL MOSTLY BE SHOWERS...ALTHOUGH THERE APPEARS TO BE A COUPLE
HUNDRED JOULES OF CAPE IN SOUTHEAST NEBRASKA. THE BETTER FORCING AND
MOISTURE TRANSPORT WILL BE SOUTH AND EAST OF THE AREA AS A UPPER
LEVEL WAVE MOVES OUT OF THE SOUTHERN PLAINS. THE RAP KEEPS THE BEST
PRECIP CHANCES IN SOUTHEAST NEBRASKA AND SOUTHWEST IOWA...AS WELL AS
WESTERN NEBRASKA CLOSER TO THE UPPER LOW. WILL PLAY POPS THAT WAY
EARLY IN THE PERIOD. OVERNIGHT...WITH WEAK ISENTROPIC LIFT ACROSS
THE REGION...AND MARGINALLY UNSTABLE CONDITIONS...SCATTERED SHOWERS
COULD DEVELOP...ESPECIALLY AS A REINFORCING WARM FRONT MOVES INTO
THE REGION THROUGH THE NIGHT. AGAIN...SHOULD MOSTLY BE SHOWERS...BUT
A FEW HUNDRED JOULES OF CAPE AND WEAKLY NEGATIVE LIFTED INDICES
COULD RESULT IN AN ISOLATED RUMBLE OF THUNDER.

.SHORT TERM...(MONDAY THROUGH WEDNESDAY)
ISSUED AT 310 PM CDT SUN MAY 24 2015

OTHER THAN SOME MINOR POP MODIFICATIONS...GOING FCST LOOKS ON TRACK
THROUGH EARLY THIS WEEK. FORTUNATELY MODELS ARE IN QUITE GOOD
AGREEMENT BULK OF ACCUMULATING PCPN WILL BE FOUND WELL EAST OF THE
CWA. NEVERTHELESS...POTENTIAL FOR SOME PCPN WILL STILL EXIST EARLY
ON IN THE FCST PD.

BEGINNING MONDAY AFTN...MODELS IN AGREEMENT ADVERTISING
INCREASING BNDRY LYR THETA-E ADVECTION COUPLED WITH VIGOROUS
LITTLE VORT MAX WILL ALLOW FOR QUICK ENVIRONMENTAL DESTABILIZATION
OVER THE REGION. CONVECTIVE INITIATION ENSUES JUST NW OF THE CWA
ALONG AXIS OF LLVL THETA-E CONVG/INVERTED SFC TROF BEFORE ACTIVITY
QUICKLY EXPANDS EWD INTO THE CWA MONDAY NIGHT/TUESDAY MORNING.
EARLY TUESDAY EVENING...EXPECT PCPN TO EXIT THE CWA AS UPPER VORT
MAX TAKES BEST LIFT/MOISTURE INTO THE UPPER MIDWEST.

TURNING TO WEDNESDAY...UPPER SHORTWAVE RIDGE OVER THE CNTRL PLAINS
WILL FINALLY BRING PLEASANT CONDITIONS BACK THE REGION WITH PARTLY CLOUDY
SKIES AND HIGHS TOPPING OUT AROUND 80.

.LONG TERM...(WEDNESDAY NIGHT THROUGH SUNDAY)
ISSUED AT 310 PM CDT SUN MAY 24 2015

LARGE SCALE FLOW PER ECM/GFS ARE IN REASONABLE AGREEMENT HEADING
INTO NEXT WEEKEND SHOWING A LONGWAVE TROF OVER THE WRN CONUS
GRADUALLY MIGRATING EAST AND EVENTUALLY REACHING THE CNTRL PLAINS ON
FRIDAY. CONVECTIVE CHANCES ARE ON TAP THE MAJORITY OF THE EXTENDED
PDS IN RESPONSE TO PROLONGED MOIST UPGLIDE AND INCREASING UPPER
SUPPORT VIA APPROACHING LONGWAVE TROF. AS FOR TEMPS...HIGHS SHOULD
BE ABLE TO PUSH INTO THE UPPER 70S BEFORE THE NEXT COLD FRONT SWEEPS
THRU FRIDAY NIGHT RESULTING IN BELOW NORMAL TEMPS AND HIGHS ONLY IN
THE MID/UPPER 60S SATURDAY AND SUNDAY.

&&

.AVIATION...(00Z TAFS FOR KOFK...KLNK AND KOMA.)
ISSUED AT 657 PM CDT SUN MAY 24 2015

VARIABLE CONDITIONS THIS EVENING WITH VFR/MVFR CIGS...SOME PATCHY
LIGHT RAIN AND SPRINKLES...AND GENERALLY LIGHT AND VARIABLE
WINDS. LATER TONIGHT...THE LOW LEVEL JET INCREASES ACROSS KANSAS
AND THERE IS A WEAK UPPER LEVEL DISTURBANCE SWINGING THROUGH. THE SLOW
MOVING FRONT IS NEAR NORFOLK. WILL MENTION A CHANCE FOR SHOWERS
WITH THESE FEATURES LATER TONIGHT AND BROUGHT CIGS/VSBYS BACK
DOWN TO PREVAILING MVFR/IFR. SHOULD SEE SOME IMPROVEMENT TO VFR
CIGS MONDAY AFTERNOON...HOWEVER THE STRONGER SHORTWAVE IS
APPROACHING AND WITH INCREASING INSTABILITY SHOULD SEE SOME
SCATTERED THUNDERSTORMS DEVELOP.

&&

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

$$

SHORT TERM...DEE
LONG TERM...DEE
AVIATION...ZAPOTOCNY



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