Area Forecast Discussion
Issued by NWS Gaylord, MI

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS63 KAPX 270734
AFDAPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GAYLORD MI
234 AM EST TUE JAN 27 2015

.NEAR TERM...(TODAY THROUGH TONIGHT)
ISSUED AT 232 AM EST TUE JAN 27 2015

HIGH IMPACT WEATHER POTENTIAL: NONE.

REGIONAL PATTERN: CAN/T HELP BUT NOTICE THE CLASSIC SATELLITE
PRESENTATION OF RAPIDLY DEVELOPING CYCLONE ALONG THE EAST COAST
EARLY THIS MORNING...BUT ALAS THE WEATHER IS A GOOD BIT QUIETER IN
THESE PARTS AS NORTHERN MICHIGAN CONTINUES TO BE SANDWICHED BETWEEN
DEEPENING EASTERN NOAM TROUGH AND LONGWAVE RIDGING CENTERED ALONG
THE ROCKIES ENSURING A CONTINUED FLOW OF NORTHWESTERLY WINDS ALOFT.
BAND OF MOISTURE IS PUSHING ACROSS NORTHERN MICHIGAN AS OF THIS
WRITING...ALONG EASTERN FLANK OF BROAD WARM ADVECTION REGIME
CENTERED WEST OF LAKE MICHIGAN SOUTH OF SOUTHWARD DROPPING LOW
EVIDENT FROM THE SURFACE UP TO H8...AS WELL AS A MID LEVEL
CONTRIBUTION FROM SOUTHEASTWARD DROPPING SHORTWAVE /SEEN AS A NICE
SWIRL IN WV IMAGERY DROPPING THROUGH MICHIGAN/. THIS MOISTURE AND
WEAK ASCENT HAS MANIFESTED ITSELF AS A BROAD AREA OF LIGHT SNOW THAT
HAS BEEN STRUGGLING TO OVERCOME LLEVEL DRY WEDGE AS IT TRIES TO PUSH
ACROSS LAKE MICHIGAN AND INTO NORTHWEST LOWER.  FINALLY...LLEVEL
EASTERLY FLOW ALONG WESTERN PERIPHERY OF CANADIAN HIGH IS SUPPORTING
LAKE CLOUDS/-SHSN ALONG MUCH OF THE COAST OF NORTHEAST LOWER WITH
T8S AROUND -11C.

THROUGH DAYBREAK: LIGHT LAKE EFFECT SNOW BAND EXTENDING ALONG THE
COAST FROM PZQ TO SLH WILL CONTINUE TO FAN OUT AS IT IS PUSHED SOUTH
BY BACKING LLEVEL FLOW.  WE CONTINUE TO SEE LIGHT RETURNS FURTHER
SOUTH FROM APN TO HARRISVILLE...AND EXPECT THESE TO CONTINUE...SO
SCATTERED FLURRIES/LIGHT SNOW WILL REMAIN IN THE FORECAST THROUGH
DAYBREAK FOR THE COAST OF NORTHEAST LOWER.  ELSEWHERE...APX 88D
SHOWING BAND OF -SN MAKING IT/S CLOSEST APPROACH TO NW LOWER WITH
SURFACE OBSERVATIONS SUPPORTING THE IDEA THAT THE LLEVEL DRY WEDGE
EVIDENT IN THE 00Z APX RAOB IS HOLDING STRONG.  EXPECT SIGNIFICANT
CLOUDINESS TO REMAIN...WITH SOME POTENTIAL CLEARING REACHING
CHIP/MACK TOWARDS DAYBREAK.  TEMPERATURES IN THIS AREA SHOULD SNEAK
INTO THE SINGLE DIGITS...WITH TEMPS REMAINING 10-15 SOUTH OF THE
MIGHTY MAC.

TODAY: TEMPORARY REX BLOCK STRENGTHENS ALONG THE US EAST COAST WITH
CLASSIC HIGH OVER LOW PATTERN EXTENDING FROM THE SURFACE TO MID
LEVELS.  THIS WILL CONTINUE TO BRING WEAKENING TO SURFACE SYSTEM
WEST OF THE LAKES THAT WILL PRETTY MUCH WASH AWAY TODAY.  WITH THIS
OCCURRING AND OVERHEAD SHORTWAVE ENERGY PASSING SOUTH AND EAST OF
THE REGION...THREAT FOR SYNOPTIC SNOWS WILL BE OVER.  MORE
COMPLICATED WILL BE LLEVEL MOISTURE EVOLUTION...WITH CURRENT
SOUTHEASTERLY FLOW SLOWLY BACKING NORTHEASTERLY AS DOWNSTREAM HIGH
PRESSURE BUILDS WEST.  THIS SHOULD ALLOW A SLOW EROSION FROM EAST TO
WEST OF DEEP MOISTURE WITH INCREASING SUN RESULTING.  EXCEPTION WILL
AGAIN LIKELY BE ALONG THE COAST OF LAKE HURON...WITH SOME
CLOUDS/FLURRIES PROBABLY CONTINUING THROUGH THE MORNING SOUTH OF APN
OVER NORTHEAST LOWER.  BY AFTERNOON...AS THE FLOW LOSES ITS EASTERLY
COMPONENT...CLEARING SHOULD PRETTY MUCH REACH ALL LOCATIONS.  T9S
NEAR -12C SUGGEST LOW 20S FOR TEMPERATURES...RIGHT IN LINE WITH
GUIDANCE CONSENSUS.

TONIGHT:  POTENTIAL DEFINITELY THERE FOR A COLD NIGHT WITH WESTERN
EDGE OF SURFACE RIDGE AXIS PRETTY MUCH RIGHT OVERHEAD BY
EVENING...SINKING SOUTH AND ALLOWING FLOW TO BACK SOUTHWESTERLY
AFTER MIDNIGHT.  NEVER A GUARANTEE GIVEN CLOUD CONCERNS...AND WITH
BACKING FLOW...FOCUS TURNS TO LAKE MICHIGAN AND LLEVEL TEMPS
THAT...DESPITE WARMING...SHOULD BE COLD ENOUGH TO ALLOW FOR SOME
CLOUD DEVELOPMENT.  AT THE SAME TIME...FIRST HIGH CLOUDS AHEAD OF
NEXT WEATHER SYSTEM LOOK TO ARRIVE AS WARM ADVECTION ALOFT COMMENCES
AFTER MIDNIGHT.  THUS...CONFIDENCE IN COLD TEMPS GREATEST AWAY FROM
THE COAST OF NORTHWEST LOWER /WHERE CLOUD CONCERNS ARE GREATEST/ AND
EASTERN UPPER...WHERE DEVELOPING SOUTHWESTERLY GRADIENT IS STRONGEST
HERE /H1000 GEOSTROPHIC WINDS 15-20KTS/ THREATENING TO KEEP THE
LLEVELS MIXED.  OUTSIDE OF THESE AREAS...TEMPS WILL LIKELY FALL TO
OR BELOW ZERO AGAIN...WITH THE COLDEST SPOTS POTENTIALLY REACHING
-5F OR SO.  TEMPS 10-15 IMMEDIATE COAST OF NW LOWER...AND SINGLE
DIGITS ABOVE ZERO FOR EASTERN UPPER.

&&

.SHORT TERM...(WEDNESDAY THROUGH THURSDAY NIGHT)
ISSUED AT 232 AM EST TUE JAN 27 2015

PATTERN DESCRIPTION AND EVOLUTION:

A GENERAL RIDGE WEST AND TROUGH EAST PATTER LOOKS TO HOLD FOR
AWHILE. LONGWAVE TROUGHING OVER THE PACIFIC/ALASKA WILL CONTINUE TO
SEND SHORTWAVES INTO WESTERN CANADA...SET TO DRIVE TOWARD NRN
MICHIGAN. THE NEXT WAVE/CLIPPER IS FAIRLY DECENT...ALREADY INTO
BRITISH COLUMBIA...AND WITH PWATS NEAR A RESPECTABLE 0.75". THERE IS
ALSO A CUT OFF LOW SPINNING OVER CALIFORNIA...UNDERNEATH THE OVERALL
RIDGING. THIS FEATURE IS EXPECTED TO LIFT OUT OF THE ROCKIES AND
INTO THE NRN PLAINS...POSSIBLY WORKING IN TANDEM WITH THE MAIN
CLIPPER.

ASSOCIATED WEATHER:

BACK DOOR DRYING FROM NE FLOW EARLY ON WEDNESDAY WILL RAPIDLY TURN
CLOUDY WITH THE APPROACH OF DEEP WAA...POCKET OF UPPER DIVERGENCE
AND OVERALL RESPECTABLE AND STRENGTHENING DEEP LAYER -DIVQ. THESE
ARE THE RESULT OF MERGING/NEAR MERGING TWO WAVES...WHICH MAY ALSO
LEAD TO A BAND OF ENHANCED FORCING DUE TO FRONTOGENESIS. RIGHT
NOW...THE STRONGEST FORCING AND DEEP MOISTURE IS EXPECTED ACROSS
EASTERN UPPER. AM CONCERNED TO SOME DEGREE OF THE LACK OF DEEP
MOISTURE INITIALLY...NO GULF...AND MUCH OF THE FORCING LIKELY BEING
USED UP TO SATURATE THE ATMOSPHERE. HOWEVER...THOSE PWATS AND
PRESENCE OF BOTH WAVES COULD BRING A GOOD 2-4" ACROSS NRN MICHIGAN.
DO NOT SEE ANY LAKE HELP WITH LAKE SFC T`S 1-3C AND H8 TEMPS RISING
TOWARD 0C TO -2C WHEN SNOWS ARE EXPECTED TO DEVELOP. THE INITIAL
SNOWS ARE SEEN ACROSS EASTERN UPPER WITH THE ELEVATED WARM FRONT AND
POTENTIAL DEVELOPING FGEN...FOR WEDNESDAY AFTERNOON. THE BEST SNOWS
WILL FALL WEDNESDAY NIGHT INTO THURSDAY MORNING...BEFORE FORCING
WANES AND DEEP DRYING ENSUES. STRONG COLD ADVECTION DEVELOPS LATER
THURSDAY AFTERNOON AND MAINLY THURSDAY NIGHT...WITH H8 TEMPS FALLING
TO -16C TO -20C....AND LIGHT LAKE EFFECT SNOWS LIKELY. GUSTY NW
WINDS WILL MAKE THINGS FEEL QUITE CHILLY WITH WIND CHILLS FALLING
BELOW ZERO.

&&

.LONG TERM...(FRIDAY THROUGH MONDAY)
ISSUED AT 232 AM EST TUE JAN 27 2015

A FEW CHANGES. VERY CHILLY AIR AND LIGHT LAKE EFFECT CONTINUES
FRIDAY WHILE A WEAK CLIPPER AND ELEVATED WARM FRONT TRY AND WORK ON
LINGERING...YET LOOSENING BAROCLINIC ZONE. NO IMPRESSED WITH THIS
FEATURE...AND MAY JUST BE DEALING WITH SOME REMNANT LAKE EFFECT
FLURRIES. OF MORE NOTE...ANOTHER CALIFORNIA TROUGH UNDERNEATH THE
PERSISTENT RIDGING MAY EJECT INTO THE PLAINS WHILE DEVELOPING LOW
PRESSURE IN TEXAS SATURDAY. WE COULD ACTUALLY SEE A SYSTEM TAP
DEEPER MOISTURE FROM THE GULF...AND MOVE UP OUR WAY SUNDAY/EARLY
NEXT WORK WEEK. WILL HAVE TO KEEP AN EYE ON THIS OVER THE COMING
DAYS. MAYBE A BETTER SNOW?

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z TUESDAY NIGHT)
ISSUED AT 1219 AM EST TUE JAN 27 2015

SUMMARY: WEAKENING LOW PRESSURE WEST OF THE GREAT LAKES WILL GIVE
WAY TO HIGH PRESSURE THAT WILL BUILD OVER THE WESTERN GREAT LAKES
FROM THE EAST WITH GENERALLY QUIET WEATHER EXPECTED THROUGH THE
COMING TAF PERIOD.

RESTRICTIONS: PLN/TVC/MBL:  VFR THROUGH THE COMING TAF PERIOD WITH
LOW CONFIDENCE IN A 5SM -SHSN THROUGH DAYBREAK...WITH 6-10KFT CLOUDS
SCOURING OUT TUESDAY MORNING. AT APN...LIGHT FLURRIES/SHSN WILL
CONTINUE THROUGH DAYBREAK WITH OCCASIONAL MVFR CIGS/VSBYS. AFTER
DAYBREAK...EXPECT THE BULK OF THIS ACTIVITY TO SHIFT SOUTH OF THE
TERMINAL WITH VFR CONDITIONS FOR THE REMAINDER OF THE TAF PERIOD.
BY TUESDAY AFTERNOON...EXPECT MOSTLY CLEAR SKIES AT EACH
TERMINAL...WITH THESE CONDITIONS CONTINUING THROUGH TUESDAY
EVENING THROUGH 06Z WEDNESDAY.

WINDS: EASTERLY WINDS 5KTS THROUGH DAYBREAK WILL BACK NORTHEAST 5-
10KTS FOR THE DAY TODAY BEFORE BACKING NORTH THIS EVENING AND
DIMINISHING TO CALM-LIGHT/VARIABLE.

LLWS: NO THREAT THIS CYCLE.


&&

.APX WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LH...NONE.
LM...NONE.
LS...NONE.
&&

$$

NEAR TERM...ARNOTT
SHORT TERM...SMD
LONG TERM...SMD
AVIATION...ARNOTT


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.