Area Forecast Discussion
Issued by NWS Gaylord, MI

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607
FXUS63 KAPX 300707
AFDAPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GAYLORD MI
307 AM EDT SAT APR 30 2016

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 307 AM EDT SAT APR 30 2016

A LARGE AREA OF STRONG SURFACE HIGH PRESSURE REMAINS LOCKED ALONG
AND NORTH OF THE US/CANADIAN BORDER EARLY THIS MORNING...WITH A
CLOSED 500 MB LOW SLOWLY SWINGING SE THRU ONTARIO. SKIES REMAIN
CLEAR ACROSS MUCH OF MICHIGAN ATTM...EXCEPT FOR A NARROW BAND OF MID
CLOUD SLIDING THRU FAR WRN UPR MICHIGAN ALONG THE SRN PERIPHERY OF
THE UPPER LOW CENTER. IN THE MEANTIME...LOW PRESSURE CONTINUES TO
DEVELOP OVER THE SRN PLAINS. DEEP MOISTURE AND INSTABILITY AHEAD OF
THIS LOW CONTINUES TO PRODUCE STRONG/SVR THUNDERSTORMS ACROSS THE
LOWER MISSISSIPPI VALLEY. LATEST IR SATELLITE LOOP SHOWS THE NRN
EDGE OF INCREASING UPPER LEVEL MOISTURE FROM THIS SYSTEM TRYING TO
MAKE NE PROGRESS INTO LWR MICHIGAN ATTM...BUT TENDING TO ERODE AS IT
ENCOUNTERS DRY LOW LEVEL NE FLOW ESTABLISHED ACROSS MICHIGAN.

HIGH CLOUDS WILL GRADUALLY INCREASE FROM SOUTH TO NORTH ACROSS OUR
CWA TODAY AS THE DEVELOPING SURFACE LOW PUSHES NE INTO THE MID
MISSISSIPPI VALLEY. THIS INCREASING HIGH CLOUD SHOULD REMAIN THIN
ENOUGH TO NOT PRECLUDE A MAINLY SUNNY DAY ACROSS THE NORTHWOODS.
ANOTHER BEAUTIFUL SPRING DAY IS IN STORE FOR OUR AREA AS HIGH TEMPS
WARM INTO THE MID 50S TO LOWER 60S. CLOUDS WILL CONTINUE TO LOWER
AND THICKEN EARLY THIS EVENING AS MID LEVEL MOISTURE INCREASES AHEAD
OF THE UPSTREAM SYSTEM. CHANCES OF LIGHT RAIN SHOWERS WILL BEGIN TO
INCREASE ACROSS THE SRN HALF OF OUR CWA AFTER 00Z...PUSHING FURTHER
NORTHWARD TO JUST SOUTH OF THE STRAITS OVERNIGHT. LATEST NAM IS MORE
AGGRESSIVE IN THE NORTHWARD PUSH OF POPS AND IN QPF. ECMWF IS
DECIDEDLY MORE CONSERVATIVE WITH RESPECT TO POPS AND QPF FROM THIS
SYSTEM. WILL TREND A BIT MORE AGGRESSIVE AS DEPICTED BY THE NAM
GIVEN THE DEEP GULF MOISTURE TAPPED AHEAD OF THIS SYSTEM...BUT WILL
STILL KEEP POPS MAINLY WITHIN THE CHANCE CATEGORY. WITH INCREASING
CLOUDS AND LOWERING CIGS...TEMPS WILL BE MORE MODERATE OVERNIGHT AS
LOWS FALL TO A FEW DEGREES EITHER SIDE OF 40.

.LONG TERM...(SUNDAY THROUGH FRIDAY)
ISSUED AT 307 AM EDT SAT APR 30 2016

(5/1)SUNDAY...MODELS HAVE TRENDED THE RAIN UP TO THE STRAITS THIS
RUN, SO HAVE TRENDED THE POPS AND RAIN TO THE STRAITS AREA. THE
MODELS NOW HAVE A VERY SHARP 500 MB TROUGH THAT DROPS INTO THE UPPER
GREAT LAKES WITH BOTH OF THEM DEEPENING A SFC LOW THAT IS JUST SOUTH
OF THE INDIANA BORDER. THIS SETS UP A VERY TIGHT BAROCLINIC ZONE AND
DEFORMATION AXIS THROUGH THE FORECAST AREA. THIS LASTS UNTIL 00Z,
BUT ONCE THE SFC LOW AND THE 500 MB TROUGH AXIS PUSHES THROUGH THE
STATE OR EAST OF THE STATE IN THE CASE OF THE FORMER, THE DRY AIR
MOVES INTO THE FORECAST AREA. THE RAIN IS EXPECTED TO DROP SOUTH OUT
OF THE FORECAST AREA, BY 06Z. HIGH PRESSURE AND MID-LEVEL DRY AIR
THEN MOVE INTO THE REGION.

(5/2)MONDAY...FOR THE DAY TIME, THE HIGH AND THE DRY MID-LEVEL AIR
(700-500 MB LAYER RH<30%) REMAINS OVER THE FORECAST AREA PROVIDING
ANOTHER DRY DAY. WITH THE RETURN FLOW IN THE FORECAST AREA THE
TEMPERATURES ARE EXPECTED TO CONTINUE TO WARM THOUGH THE DAY. WILL
HAVE TO WATCH THIS DAY AS THE PRESSURE GRADIENT IS TIGHT ENOUGH,
THAT IT IS POSSIBLE FOR WINDS TO INCH UP TO 15 MPH, AND THE MIN RH
IS EXPECTED TO BE SUB 30%. THOSE TWO FIRE WEATHER PARAMETERS ARE
CLOSE TO CROSSING THE MORE CRITICAL THRESHOLDS. HOWEVER, AFTER 00Z,
THE MOISTURE BEGINS TO INCREASE. THE GFS IS A LITTLE MORE AGGRESSIVE
THAN THE ECMWF WITH THE SHORTWAVE DROPPING IN FROM NORTHERN ONTARIO.
IT HAS SHOWN THIS SCENARIO THE LAST FEW NIGHTS. SO WILL GO WITH SOME
LOW CHANGE POPS IN E UPPER AS THE WAVE MOVES INTO THE REGION.

EXTENDED (TUESDAY THROUGH FRIDAY)...AS WAS POINTED OUT IN THE DAY
DISCUSSION A BOWLING BALL BEGINS TO ROLL DOWN THE ALLEY INTO THE
UPPER GREAT LAKES ON BOTH THE GFS AND THE ECMWF. AS IT DOES, AND A
SIMILAR LOW AT 500 MB OVER THE PACIFIC COAST CUTS OFF, WE GET INTO
AN OMEGA BLOCK WITH THE RIDGE CENTERED IN THE CENTRAL PLAINS. THIS
MEANS, AT LEAST THAT WE WILL REMAIN CHILLY WITH 500 MB LOWS SITTING
OVER THE UPPER GREAT LAKES THROUGH FRIDAY. MODELS SHOW THAT WE WILL
SIT IN SOME DRY AIR THOUGH. THIS WOULD PUT IS BELOW NORMAL
TEMPERATURES AND BELOW NORMAL PRECIPITATION.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z SATURDAY NIGHT)
ISSUED AT 105 AM EDT SAT APR 30 2016

VFR CONDITIONS WILL REMAIN THE RULE FOR ALL NRN LWR MICHIGAN TAF
SITES THRU SATURDAY NIGHT AS A LARGE AREA OF STRONG SURFACE HIGH
PRESSURE STAYS IN CONTROL OF THE WEATHER ACROSS THE NRN GREAT
LAKES. MID/HIGH CLOUDS WILL GRADUALLY INCREASE ACROSS THE REGION
ALONG THE NRN FRINGE OF INCREASING MOISTURE WELL IN ADVANCE OF
LOW PRESSURE DEVELOPING OVER THE SRN PLAINS. LIGHT WINDS OVERNIGHT
WILL BECOME E/NE AT AROUND 10 KTS ON SATURDAY.

&&

.MARINE...
ISSUED AT 307 AM EDT SAT APR 30 2016

NE WINDS AND WAVES WILL STRENGTHEN TO SCA CRITERIA BY LATE MORNING
FOR OUR NEARSHORE AREAS BETWEEN GRAND TRAVERSE LIGHT AND MANISTEE
AND WILL HOLD THRU MUCH OF SUNDAY. COASTAL CONVERGENCE WILL DEVELOP
THANKS TO NE LOW LEVEL FLOW PARALLEL TO THE SHORELINE WITHIN THIS
AREA COMBINED WITH TIGHTENING LOW LEVEL GRADIENT AHEAD OF THE
SURFACE LOW LIFTING THRU THE MID MISSISSIPPI VALLEY AND EVENTUALLY
TRACKING NE TO LAKE ERIE. OUR LAKES MICHIGAN AND HURON NEARSHORE
AREAS WILL BE ALONG THE NRN FRINGE OF DEEP MOISTURE THRU SUNDAY...
LENDING TO LIMITED PRECIP CHANCES THRU THE WEEKEND.

&&

.APX WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LH...NONE.
LM...SMALL CRAFT ADVISORY FROM 11 AM THIS MORNING TO 6 PM EDT SUNDAY
     FOR LMZ344>346.

LS...NONE.
&&

$$

SHORT TERM...MLR
LONG TERM...JSL
AVIATION...MLR
MARINE...MLR



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