Area Forecast Discussion
Issued by NWS Hastings, NE

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000
FXUS63 KGID 300857
AFDGID

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HASTINGS NE
357 AM CDT WED JUL 30 2014

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 357 AM CDT WED JUL 30 2014

...FAIRLY UNEVENTFUL WX PATTERN CONTS AS WE GRAPPLE WITH MINOR
DISTURBANCES THAT REDUCE FCSTR CONFIDENCE...

THERE IS ESSENTIALLY NO CHANGE IN THE SYNOPTIC FEATURES. THAT
LEAVES US TO DEAL WITH MESOSCALE FEATURES WHICH HAVE LESS
PREDICTABILITY AND LOWER FCST CONFIDENCE.

ALOFT: NW FLOW ALOFT REMAINS. A WEAK AND SHEARED SHORTWAVE TROF
WAS OVER ND IN WATER VAPOR IMAGERY AND DROPPING S INTO SD. THIS
TROF WAS ASSOCIATED WITH SOME VERY SPOTTY TSTM ACTIVITY YESTERDAY
AFTERNOON AND EVEN A COUPLE SHWRS OVERNIGHT. IT WILL CONT DROPPING
S AND ARRIVE HERE IN NEB TONIGHT.

SURFACE: OVERALL HIGH PRES WILL REMAIN PARKED FROM THE CANADIAN
PRAIRIES SE INTO THE ERN USA. THE APPROACHING TROF WILL INDUCE A
WEAK LOW OVER WRN SD AND 07Z MSAS ANALYSIS SHOWS CONVERGENCE AND
FALLING PRES THERE. THIS LOW IS FCST TO DROP SE INTO THE SANDHILLS
BY TONIGHT.

NOW THRU SUNRISE: CLOUDY S OF HWY 6 WITH THE BAND OF DEFORMATION/
FGEN-DRIVEN SHWRS CONTINUING TO SLOWLY SINK S THRU N-CNTRL KS. THE
NRN EDGE OF THE CIRRUS SHIELD IS ALREADY SAGGING S AND SHOWING
SIGNS OF THINNING IN SOME AREAS. SO EXPECT DECREASING CLOUDS N OF
I-80. IN THE MINUTES JUST PRIOR TO SUNRISE...THE MULTI-LAYERED
CLOUDS SHOULD PRODUCE SOME NICE COLORS.

TODAY: M/CLOUDY BUT GRADUALLY DECREASING CLOUDS FROM THE N. THE CO
SHORTWAVE TROF RESPONSIBLE FOR THE BAND OF FGEN SHWRS OVER N-CNTRL
KS AND THE MORE EXTENSIVE RAIN/TSTMS TO THE S AND W WILL DIVE INTO
OK TODAY. THIS SHOULD ALLOW FOR THE GRADUAL IMPROVEMENT. USED
CONSENSUS OF MODEL 2M TEMPS FOR HIGHS WITH A BIAS CORRECTION WHICH
OFFERS 75-80F...COOLEST OVER N-CNTRL KS WHERE CLOUDS WILL HANG ON
THE LONGEST.

FCST CONFIDENCE: MEDIUM

TONIGHT: PROBABLY JUST SOME PATCHY THIN CIRROSTRATUS IN THE
EVENING THEN INCREASING CLOUDS. LOW TEMPS ARE CONSENSUS OF MODEL
2M TEMPS WITH NO BIAS CORRECTION /55-60F/. HOWEVER...WITH NEARLY
CALM WINDS EXPECTED SOME AREAS THAT STAY OUT OF THE CLOUD COVER
LONGEST COULD END UP A LITTLE COOLER.

A FEW SHWRS MAY TRY TO DEVELOP N OF I-80 IN THE BURST OF MODEST
WARM AIR ADVECTION AND FRONTOGENESIS ASSOCIATED WITH THE WEAK
LOW/TROF. THE 18Z/00Z/06Z NAM RUNS HAVE CONTINUITY WITH THEIR
SPOTTY/LOW QPF. ALL OTHER MODELS HAVE NO CONSISTENCY OR NO QPF.

THE SATURATION THAT OCCURS IN THE 6-8K FT LAYER DOES LEAD TO
POTENTIAL INSTABILITY. ALL MODELS FCST A WEAK CAP BETWEEN 600-500
MB. THE MOST UNSTABLE PARCEL IN THE NAM SOUNDINGS DOES GET PAST
THIS WITH A VERY SKINNY CAPE PROFILE /MAYBE 400 J/KG CAPE?/ AND
AN EQUILIBRIUM LVL NEAR 29K FT.

FOR NOW...A 20% POP HAS BEEN INSERTED INTO THE FCST N OF I-80
AFTER MIDNIGHT WITH NO THUNDER. THIS MAY CHANGE IF THE DAY SHIFT
HAS HIGHER CONFIDENCE IN THE PROBABILITY OF OCCURRENCE.

FCST CONFIDENCE: MEDIUM


.LONG TERM...(THURSDAY THROUGH TUESDAY)
ISSUED AT 357 AM CDT WED JUL 30 2014

THE AMPLIFIED RIDGE TO THE WEST AND TROUGH TO THE EAST REMAIN
PERSISTENT IN UPPER LEVELS. THIS PATTERN DEAMPLIFIES BY EARLY NEXT
WEEK. MAIN FORECAST ISSUE WILL BE CHANCE OF PRECIPITATION
THURSDAY...THEN AGAIN MONDAY INTO TUESDAY.

THE MAIN ISSUE FOR THURSDAY WILL BE A SHOT AT SOME SHOWERS AND
THUNDERSTORMS THURSDAY AFTERNOON...MAINLY NORTH/NORTHEASTERN CWA
AS A PERTURBATION MOVES NEARBY WITHIN UPPER LEVEL NORTHWEST FLOW.
THE FOCUS HAS BEEN CONSISTENTLY FORECAST MORE TOWARD THE
NORTH/NORTHEASTERN CWA FOR THE PAST COUPLE OF DAYS. NUMERICAL
MODELS ARE NOT IN WIDESPREAD AGREEMENT...WITH THE ECMWF REMAINING
DRY FOR THURSDAY...WHEREAS THE NAM HAS BEEN CONSISTENTLY
FORECASTING SOME SPOTTY CONVECTION AS THE WAVE MOVES THROUGH.
THERE SHOULD BE ENOUGH INSTABILITY TO ALLOW THUNDER...BUT NOT
ENOUGH FOR SEVERE WEATHER AS BULK SHEAR WILL BE MODERATE AT AROUND
25 TO 30 KTS TOPS AND CONVECTIVE AVAILABLE POTENTIAL ENERGY NOT
MUCH MORE THAN 750 J/KG.

AFTER THE THURSDAY WAVE...WE HAVE A DRY FORECAST THROUGH THE
WEEKEND FOR THE MOST PART...SAVE A SLIGHT CHANCE OF PRECIPITATION
IN OUR FAR NORTHWEST ON FRIDAY AFTERNOON WITH ANOTHER POTENTIAL
PERTURBATION WITHIN NORTHWEST FLOW. I DID NOT EXPAND THIS FARTHER
SOUTHEAST AS TIMING OF THE PERTURBATION IS IN QUESTION.. THERE MAY
NOT BE ENOUGH INSTABILITY BY FRIDAY NIGHT TO GET MUCH OF ANYTHING
GOING AS THE PERTURBATION MOVES OVER OUR AREA...AS PREDICTED BY
SOME NUMERICAL MODELS SUCH AS THE NAM.

AS THE PATTERN DE-AMPLIFIES...THERE WILL BE MORE OF A SHOT AT
SOME PRECIPITATION AND THIS IS REFLECTED IN THE FORECAST FOR EARLY
NEXT WEEK AS A SHORTWAVE TROUGH CUTS THROUGH THE DE-AMPLIFIED
RIDGE TO THE WEST. TEMPERATURES MAKE A GRADUAL REBOUND TO MORE
NORMAL CONDITIONS.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z WEDNESDAY NIGHT)
ISSUED AT 1232 AM CDT WED JUL 30 2014

REST OF TONIGHT: MULTI-LAYERED VFR CEILINGS AT OR ABOVE 10K FT.
LIGHT MAINLY E WINDS UNDER 10 KTS.
CONFIDENCE: HIGH

WED: MULTI-LAYERED VFR CLOUDS DIMINISH LEAVING JUST CIRRUS
CEILINGS AROUND 25K FT. LIGHT NE WINDS UNDER 10 KTS.
CONFIDENCE: HIGH

WED EVE: VFR AND LIGHT WINDS.
CONFIDENCE: HIGH

&&

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

$$

SHORT TERM...HALBLAUB
LONG TERM...HEINLEIN
AVIATION...HALBLAUB



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