194
FXUS10 KWNH 280437
PMDHMD
MODEL DIAGNOSTIC DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1236 AM EDT MON OCT 28 2019
VALID OCT 28/0000 UTC THRU OCT 31/1200 UTC
...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR
INGEST...
00Z MODEL EVALUATION WITH LATEST PREFERENCES AND CONFIDENCE
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
..DEPARTING MID-LEVEL TROUGH/SURFACE LOW NEAR NEW ENGLAND
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: GENERAL MODEL BLEND
CONFIDENCE: ABOVE AVERAGE
THE LATEST MODEL GUIDANCE IS IN VERY GOOD AGREEMENT WITH THE
EXITING AND WEAKENING MID-LEVEL TROUGH AND ASSOCIATED SURFACE LOW
NEAR NEW ENGLAND. A GENERAL MODEL BLEND WILL BE PREFERRED.
..MID-LEVEL TROUGH EJECTING INTO THE CENTRAL PLAINS ON MONDAY
..SURFACE COLD FRONT OVER THE LOWER/MID MS VALLEY BY TUESDAY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: GENERAL MODEL BLEND
CONFIDENCE: ABOVE AVERAGE
ALTHOUGH THERE REMAIN SOME MINOR TIMING DIFFERENCES WITH A
SHORTWAVE REACHING THE CENTRAL PLAINS FROM THE GREAT BASIN ON
MONDAY, THERE IS ENOUGH AGREEMENT TO SUPPORT A GENERAL MODEL BLEND.
..SHORTWAVE/CLIPPER LOW OVER MT/ND BY MONDAY EVENING
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: GENERAL MODEL BLEND
CONFIDENCE: ABOVE AVERAGE
NO SIGNIFICANT DIFFERENCES EXIST WITH THIS SYSTEM AND RUN TO RUN
CONTINUITY HAS BEEN GOOD SO ABOVE AVERAGE CONFIDENCE EXISTS FOR A
GENERAL MODEL BLEND.
..POWERFUL CLOSED LOW OVER THE INTERMOUNTAIN WEST BY TUESDAY
..ENERGY ADVANCING EAST ACROSS THE PLAINS WEDNESDAY
..COLD FRONT/SURFACE WAVE NEAR OH/TN VALLEYS BY THURSDAY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: BLEND OF THE 12Z ECMWF/ECENS MEAN
CONFIDENCE: AVERAGE...BECOMING BELOW AVERAGE BY MIDWEEK
A STRONG DEEP LAYER RIDGE OVER THE GULF OF AK WILL SHIFT TOWARD
NORTHWEST CANADA ON MONDAY WHICH WILL ALLOW SHORTWAVE ENERGY TO
DIG VIGOROUSLY SOUTHWARD ACROSS SOUTHWEST CANADA AND INTO
INTERMOUNTAIN WEST, LEADING TO THE DEVELOPMENT OF A DEEP LONGWAVE
TROUGH OVER THE INTERMOUNTAIN WEST AND HIGH PLAINS BY TUESDAY. AS
ADDITIONAL ENERGY DIGS INTO THE BACKSIDE OF THE TROUGH ON
WEDNESDAY, THERE SHOULD BE A STRONG CLOSED LOW EVOLUTION THAT
SETTLES DOWN TOWARD THE FOUR CORNERS REGION. AS NORTHERN STREAM
SHORTWAVE ENERGY BEGINS TO BREAK DOWN THE LARGE SCALE RIDGING OVER
WESTERN CANADA BY THE MIDDLE OF THE WEEK, THE STRONG CLOSED
LOW/TROUGH WILL BEGIN TO ATTAIN GREATER PROGRESSION OFF TO THE
EAST WITH THE GUIDANCE SUPPORTING THE CLOSED LOW ADVANCING EAST
ACROSS THE CENTRAL PLAINS AND REACHING THE MIDDLE MS VALLEY BY
THURSDAY. THE 00Z NAM IS STILL EXHIBITING SOME TENDENCIES TO BE A
TAD STRONGER THAN ALL OF THE GLOBAL MODELS WITH THE CLOSED LOW
EVOLUTION, AND BY THE END OF THE PERIOD, THE NAM BECOMES A SLOW
OUTLIER. THE 00Z GFS AGAIN IS THE MOST PROGRESSIVE OF ALL OF THE
DETERMINISTIC MODELS, AND FASTER THAN THE 18Z GEFS MEAN. THE 12Z
UKMET, 12Z CMC AND 12Z ECMWF ARE ALL SLOWER THAN THE GFS, BUT NOT
AS SLOW AS THE NAM. THE 12Z ECENS MEAN SUPPORTS THE NON-NCEP
DETERMINISTIC SUITE. THE PREFERENCE AT THIS POINT AT THE SURFACE
WITH THE COLD FRONT, SURFACE LOW DEVELOPMENT LATE IN THE PERIOD
TOWARD THE OH/TN VALLEY, AND THE BROADER UPPER TROUGH/CLOSED LOW
EVOLUTION WILL BE TOWARD A BLEND OF THE ECMWF AND ECENS MEAN.
..POTENTIAL DISTURBANCE IN THE GULF OF MEXICO EARLY NEXT WEEK
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: GENERAL MODEL BLEND
CONFIDENCE: ABOVE AVERAGE
THERE IS CURRENTLY AN AREA OF DISTURBED WEATHER JUST EAST OF THE
YUCATAN PENINSULA WHICH SOME OF THE MODELS TRACK AROUND THE
WESTERN SIDE OF THE SUBTROPICAL ATLANTIC RIDGE AND INTO THE GULF
OF MEXICO OVER THE NEXT 1 TO 2 DAYS. COLLECTIVELY, THE GUIDANCE
FAVORS LITTLE TO NO DEVELOPMENT OF THIS SYSTEM, BUT THE MODEST
ENERGY WILL GRADUALLY BECOME ABSORBED BY THE STRONG COLD FRONT
REACHING THE WESTERN GULF COAST REGION AND LOWER MS VALLEY BY THE
MIDDLE OF THE WEEK. A GENERAL MODEL BLEND WILL BE PREFERRED.
MODEL TRENDS AT WWW.WPC.NOAA.GOV/HTML/MODEL2.HTML
500 MB FORECASTS AT WWW.WPC.NOAA.GOV/H5PREF/H5PREF.SHTML
ORRISON
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