Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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000 FXUS63 KGRR 200415 AFDGRR AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 1215 AM EDT MON OCT 20 2014 LATEST UPDATE... AVIATION .SYNOPSIS... ISSUED AT 310 PM EDT SUN OCT 19 2014 A CLIPPER SYSTEM MOVING SOUTHEAST FROM CENTRAL CANADA WILL GIVE US A CHANCE OF SHOWERS TONIGHT AND MONDAY. MUCH OF THE REST OF THE WEEK WILL BE DRY. TUESDAY AND WEDNESDAY WILL BE THE COOLEST DAYS WITH HIGHS IN THE LOWER TO MID 50S...AFTER WHICH A SLOW WARM UP INTO THE LOWER 60S IS EXPECTED. && .SHORT TERM...(THIS EVENING THROUGH TUESDAY NIGHT) ISSUED AT 310 PM EDT SUN OCT 19 2014 FORECAST CONCERNS ARE MINIMAL TODAY AND FOCUS ON THE CLIPPER MOVING SOUTHEAST TOWARD MICHIGAN. REGIONAL RADAR SHOWS LIGHT SHOWERS MOVING ACROSS NORTHERN WISCONSIN. HOWEVER A QUICK CHECK OF THE OBS SHOWS MOST OF IT AS VIRGA. THE PCPN IS IN THE WARM ADVECTION PATTERN AHEAD OF THE LOW THAT IS STILL IN SOUTHERN CANADA. MODELS SHOW CONDENSATION PRESSURE DEFICITS FALLING THE MOST OVER THE NORTHERN CWA TONIGHT AND FAR EASTERN CWA MONDAY. HOWEVER THE WARM ADVECTION ISN/T ALL THAT IMPRESSIVE THE VALUE OF THOSE DEFICITS ARE NOT ENOUGH TO SUGGEST MUCH RAINFALL. QPF IS LIGHT AND POPS WERE HELD IN THE CHANCE CATEGORY. THE TRAILING UPPER LOW IS PRETTY SHARP AND WELL VISIBLE IN WATER VAPOR IMAGERY AND THE LIFT AHEAD OF IT WILL PROVIDE THE BEST CHANCE FOR SHOWERS EAST OF US-127 MONDAY. H8 TEMPS FALL TO AROUND 1C BEHIND THE SYSTEM TUESDAY RESULTING IN HIGHS IN THE LOWER 50S TUE. .LONG TERM...(WEDNESDAY THROUGH SUNDAY) ISSUED AT 310 PM EDT SUN OCT 19 2014 MODELS ARE IN DECENT AGREEMENT IN SHOWING A CLOSED UPPER LOW OFF THE NEW ENGLAND COAST THROUGH FRIDAY. THIS WILL IMPACT OUR AREA BY ALLOWING FOR AN UPPER RIDGE TO DOMINATE OUR WEATHER HERE IN MICHIGAN. A WEAK MID LEVEL SHORTWAVE DOES PUSH IN FOR THU NIGHT...BUT THIS SYSTEM WILL BE WEAKENING...SO NO PRECIPITATION IS EXPECTED AT THIS TIME. THURSDAY INTO SATURDAY...TEMPERATURES WILL WARM UP. A PERSISTENT SOUTHWESTERLY FLOW WILL ADVECT IN A RELATIVELY MILD AIRMASS. AT THIS POINT THE 850 MB THERMAL RIDGE PUSHES THROUGH ON SATURDAY. THIS WOULD BE OUR WARMEST DAY. A COLD FRONT ARRIVES LATER SATURDAY OR SATURDAY NIGHT...WHICH LOOKS DRY AT THIS POINT. && .AVIATION...
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(FOR THE 06Z TAFS THROUGH 06Z TUESDAY) ISSUED AT 1215 AM EDT MON OCT 20 2014 VFR CONDITIONS ARE LIKELY TO CONTINUE OVERNIGHT ALTHOUGH CONDITIONS MAY BEGIN TO DETERIORATE TO MVFR AROUND TO AFTER DAYBREAK AS SHOWERS BECOME MORE PREVALENT ACROSS SOUTHERN MICHIGAN. MVFR CONDITIONS ARE THEN LIKELY FOR MOST OF MONDAY DUE TO LOW CLOUDS AND SCATTERED SHOWERS. CONDITIONS SHOULD GRADUALLY IMPROVE TO VFR LATE MONDAY AND MONDAY EVENING. SOUTHWEST WINDS OF AROUND 10 KTS OVERNIGHT WILL SHIFT TO THE NORTHWEST BEHIND THE COLD FRONT ON MONDAY. SOME GUSTS TO AROUND 20KTS ARE LIKELY ALONG THE LK MI SHORELINE INCLUDING KMKG BOTH TONIGHT AND MONDAY.
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&& .MARINE... ISSUED AT 310 PM EDT SUN OCT 19 2014 THE SCA CONTINUES THROUGH TUESDAY NIGHT. && .HYDROLOGY... ISSUED AT 310 PM EDT SUN OCT 19 2014 NO HYDRO ISSUES. LIGHT RAIN SHOWERS TONIGHT/TUESDAY WILL HAVE A NEGLIGIBLE AFFECT ON LOCAL STREAMS. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...NONE. LM...SMALL CRAFT ADVISORY UNTIL 8 AM EDT WEDNESDAY FOR LMZ844>849. && $$ SYNOPSIS...93 SHORT TERM...93 LONG TERM...MJS AVIATION...LAURENS HYDROLOGY...93 MARINE...93

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