Freezing Rain Advisory 4, NWS Milwaukee, WI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
315 AM CST THU DEC 18 2014

.TODAY AND TONIGHT...FORECAST CONFIDENCE - MEDIUM.

MAIN CONCERN FOR THIS PERIOD IS CLOUD COVER.  HIGH PRESSURE RIDGE
OVER WRN GRLAKES WILL SUPPRESS ANY PRECIP TO THE SOUTH FROM SHORT
WAVE PASSING ACROSS MID-MS VALLEY REGION.

NEARLY STATIONARY AREA OF STRATUS OVER NORTHERN AND CENTRAL WI IS
BEGINNING TO INCH SLOWLY SWD LAST SEVERAL HOURS.  11-3.9 MICRON
IMAGERY SHOWING EDGE OF STRATUS HAS SAGGED INTO NRN WAUKESHA AND
JEFFERSON COUNTIES EXTENDING NORTHWEST TOWARD KDLL.  WEAK SUBSIDENCE
FROM LEFT ENTRANCE REGION OF PASSING UPPER JET MAY HAVE CONTRIBUTED
TO STRATUS REMAINING STATIONARY MUCH OF THE NIGHT...HOWEVER THIS
SUPPRESSION MOVING OFF TO THE EAST EARLY THIS MRNG.  00Z KGRB
SOUNDING SHOWED MOISTURE RELATIVELY THICK AROUND 3K FEET.  LINGERING
VERY WEAK FORCING FROM 85H CYCLONIC CURVATURE AND LOW LEVEL WINDS
TURNING A BIT MORE NORTH TO NORTHWEST TODAY.  HENCE EXPECT STRATUS
FIELD TO CONTINUE TO SPREAD SOUTH AND ENGULF MOST OF CWA THRU THE
MRNG.

NOT IMPOSSIBLE A FEW FLURRIES MAY GET SHAKEN OUT OF THE STRATUS DUE
TO VERY WEAK LIFT.  EXPECT ONLY SLOW CLEARING LATER TONIGHT INTO FRI
MRNG.

.FRIDAY - CONFIDENCE...MEDIUM
QUIET WEATHER CONTINUES AS HIGH PRESSURE DOMINATES. VERY LITTLE
STIRRING IN THE COLUMN. LOW LEVEL RH PROGS OFFER HOPE AT A BIT OF
SUNSHINE WHILE THE NAM SHOWS STRONG INVERSION AROUND 900
MILLIBARS. SOME DECREASE IN 925-850 RH NOTED DURING THE DAY SO
WILL HAVE SOME CLOUDS IN THE GRIDS BUT HOPE FOR A BIT MORE
SUNSHINE THAN WHAT THE NAM MOS IS SUGGESTING.

.SATURDAY - CONFIDENCE...MEDIUM
 MODELS CONTINUE TO SHOW A 500 MILLIBAR SHORTWAVE MOVING FROM
IOWA INTO NORTHERN INDIANA. NAM SOUNDING SHOWS COLUMN FAIRLY MOIST
BLO 800 MILLIBARS WITH NO SATURATION NOTED IN THE FAVORED ICE
GROWTH REGION. MEANWHILE GFS SHOWS SOME MOISTENING BETWEEN 700 AND
800 MILLIBARS. WITH WEAK WAA REGIME SETTING UP WAS TEMPTED TO ADD
SOME FLURRIES OR DRIZZLE. PER COLLAB WITH SURROUNDING OFFICES WILL
LEAVE OUT. LOW LEVEL MOISTURE PROGS SHOW THE SYNOPTICALLY FAVORED
RETURN OF STRATUS WITHIN THIS WEAK WAA REGIME.

.SUNDAY AND SUNDAY NIGHT - CONFIDENCE...MEDIUM
ANOTHER SHORTWAVE AFFECTS THE AREA. LOW LEVEL WARM AIR ADVECTION
IS ONGOING WITH SUSTAINED SOUTHERLY FLOW. THERMAL PATTERN SUGGESTS
LIGHT SNOW AS THE PRECIP TYPE WITH 850 AND 925 TEMPS AOB 0C AND
1000/500 MILLIBAR THICKNESSES 531-537DM. BETTER ICE CRYSTAL GROWTH
SATURATION NOTED IN WESTERN CWA PER BUFKIT SOUNDINGS.

.MONDAY THROUGH WEDNESDAY - CONFIDENCE...LOW
UPPER LOW PROGGD TO EVOLVE AND PLOD THROUGH GREAT LAKES THIS
PERIOD. MODELS NOW SHOW SECONDARY AND STRONGER LOW DEVELOPMENT
ALONG EAST COAST. GFS AND ECMWF ARE IN GOOD AGREEMENT ON THIS 00Z
RUN BUT CONSISTENCY HASN/T BEEN ESTABLISHED AS YET SO CONFIDENCE
STILL A BIT SHAKY THIS FAR OUT. CERTAINLY PLAUSIBLE THAT THIS IS
NOT THE FINAL ANSWER CONSIDERING THIS SOUTHERN AND EASTERN
SECONDARY LOW DEVELOPMENT IS IN THE DAY 6/7 TIMEFRAME. HAVING
SAID THAT...SHOULD THIS 00Z MODEL CONSENSUS SHOW STAYING POWER WE
WOULD BE LOOKING AT A WARMER SCENARIO MONDAY INTO AT LEAST THE
FIRST PART OF TUESDAY BEFORE COLDER AIR WRAPS IN AND CHANGES
PRECIP TYPE TO ALL LIGHT SNOW FOR LATER TUESDAY INTO WEDNESDAY
WITH A POTENTIAL WHITENING OF THE LANDSCAPE.

&&

.AVIATION/12Z TAFS/...EXPECT STRATUS FIELD OVER NORTHERN CWA TO SPREAD
SOUTHWARD INTO TAF SITES THIS MRNG WITH MVFR CIGS THEN LIKELY TO CONTINUE
INTO TNGT. POSSIBLE A FEW LIGHT FLURRIES MAY GET SHAKEN OUT OF THE
CLOUDS BUT NO VSBY RESTRICTION IS EXPECTED.

RECENT ASCENT KMKE TAMDAR SOUNDING CONTINUED TO SHOW STRONG ELEVATED
INVERSION ABV 3.8K AND 00Z KGRB SOUNDING SHOWED THE MOISTURE WAS
RELATIVELY DEEP TO THE NORTH...AROUND 3K FT.

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...NONE.
LM...NONE.
&&

TODAY/TONIGHT AND AVIATION/MARINE...MBK
FRIDAY THROUGH WEDNESDAY...COLLAR

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