Area Forecast Discussion
Issued by NWS Marquette, MI

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000
FXUS63 KMQT 131943
AFDMQT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MARQUETTE MI
343 PM EDT SUN APR 13 2014

.SHORT TERM...(THIS EVENING THROUGH MONDAY)
ISSUED AT 343 PM EDT SUN APR 13 2014

UPPER AIR PATTERN CONSISTS OF A SHORTWAVE OVER LAKE HURON...ANOTHER
OVER CENTRAL KANSAS WHICH IS GETTING EJECTED OUT OF A TROUGH IN THE
NORTHERN ROCKIES. THE TROUGH MOVES INTO THE NORTHERN PLAINS TONIGHT
AND INTO THE UPPER MISSISSIPPI RIVER VALLEY ON MONDAY. NAM BRINGS IN
SOME 850-500 MB Q-VECTOR CONVERGENCE AND DEEPER MOISTURE INTO THE
CWA TONIGHT. BEST MOISTURE APPEARS TO STAY TO THE SOUTH AND EAST OF
THE CWA AND WILL HAVE THE HIGHEST POPS ACROSS THE EAST HALF OF THE
CWA. GFS AND ECMWF SHOW 850-500 MB Q-VECTOR CONVERGENCE MOVING
ACROSS THE AREA AS WELL TONIGHT AND MONDAY.

LATEST MODEL RUNS HAVE BROUGHT THE PCPN A BIT FURTHER WEST AGAIN
WITH THE ECMWF A BIT FURTHER WEST AS WELL. BECAUSE OF THIS...QPF AND
SNOW AMOUNTS WERE BUMPED UP SLIGHTLY OVER THE EASTERN CWA. LOOKS
LIKE THIS EVENT COULD SEE 2 TO 6 INCHES OF SNOW OVER THE EASTERN CWA
AND ISSUED A SNOW ADVISORY FOR ALGER...LUCE AND NORTHERN SCHOOLCRAFT
COUNTIES. STILL LOOKS LIKE THE EVENT WILL START OUT AS RAIN OVER THE
EASTERN CWA BEFORE THE PCPN SWITCHES OVER TO SNOW. USED WET BULB
ZERO HEIGHTS FOR THE WEATHER POTENTIAL GRIDS. WILL HAVE HIGHEST POPS
OVER THE EASTERN AND SOUTHERN CWA AND LOWEST POPS IN THE FAR WEST
AND NORTH. OTHERWISE...DID NOT MAKE TOO MANY CHANGES TO THE GOING
FORECAST AND STORM WILL PULL OUT MONDAY AFTERNOON.

.LONG TERM...(MONDAY NIGHT THROUGH SUNDAY)
ISSUED AT 326 PM EDT SUN APR 13 2014

FOCUSED MAINLY ON MID WEEK AS POTENTIAL EXISTS FOR SIGNIFICANT
PRECIP. FOR LATER THIS WEEK INTO THE WEEKEND...CONFIDENCE IS REDUCED
SIGNIFICANT...SO JUST USED CONSENSUS GUIDANCE FOR THAT TIME PERIOD.

SOME ISOLATED-SCATTERED LES IS EXPECTED ON MON NIGHT/TUE AS 850MB
TEMPS WILL BE -18C TO -20C WITH NW LOW LEVEL WINDS. INCOMING SFC
HIGH PRESSURE WILL LEAD TO A GRADUAL DIMINISHING TREND THROUGH THE
PERIOD.

WHILE CONFIDENCE IS STILL LIMITED...THE MAIN ATTENTION IN THE LONG
TERM WITH THE RESULT OF UPPER LEVEL ENERGY MOVING INTO THE PLAINS
TUE NIGHT. BASICALLY...THERE ARE TWO CAMPS THE MODELS ARE IN. THE
12Z/13 GFS 12Z/13 AND GLOBAL GEM PHASE AN UPPER LEVEL TROUGH WITH A
SHORTWAVE AS THE TROUGH NEARS THE US/CANADIAN BORDER...WHICH DEEPENS
THE TROUGH INTO A CLOSED LOW BY THURSDAY AFTERNOON AND DIRECTS A
SECOND SHORTWAVE INTO THE SRN PLAINS. AS A RESULT...THE SFC LOW
ASSOCIATED WITH THE SECOND SHORTWAVE DEEPENS AND MOVES TO THE SRN
PLAINS...WITH A SFC TROUGH/FRONT DEVELOPING OVER THE CWA THAT
REMAINS STATIONARY OVER THE CWA WED THROUGH AT LEAST THU AHEAD OF
THE UPPER LOW. THIS IDEA RESULTS IN TOTAL QPF AMOUNTS TUE NIGHT
THROUGH THU GENERALLY OF 1-2 INCHES /EVEN BLEND OF THE GEM AND GFS/.
THE 00Z/13 ECMWF DOES NOT PHASE THE TROUGH AND FIRST
SHORTWAVE...WHICH BRINGS THAT SHORTWAVE AND WEAK SFC LOW S OF THE
CWA WED INTO WED NIGHT...WITH MUCH LOWER QPF AMOUNTS ON THE N SIDE
OF THE SFC LOW OF UP TO 0.6 INCHES OVER THE NRN CWA. MODELS DO SHOW
SIMILAR THERMAL PROFILES THROUGH THIS TIME FRAME...WHICH WOULD
SUPPORT A MIX OF RAIN AND SNOW S AND MOSTLY SNOW N. AS FOR MODEL
CONTINUITY...THE GFS HAS SHOWN GOOD RUN TO RUN CONTINUITY OVER THE
LAST SEVERAL RUNS. THE ECMWF DID SHOW GOOD CONTINUITY UNTIL THE LAST
RUN...WHICH TRENDED A LITTLE CLOSER THE GFS. THE GLOBAL GEM HAS BEEN
TRENDING TOWARD THE GFS. THIS BEING SAID...STILL HAVE LIMITED
CONFIDENCE AS THE HIGHER END QPF AMOUNTS FROM THE GFS/GEM WILL BE
VERY DEPENDENT ON MANY OTHER FEATURES...AND FORECASTING MORE
ANOMALOUSLY HIGH QPF AMOUNTS IS HARD TO JUSTIFY WITHOUT BETTER
CONFIDENCE. USED A CONSENSUS APPROACH WITH A BIAS TOWARD THE
GFS/GEM. WILL MENTION IN THE HWO/EHWO THE POTENTIAL FOR MODERATE
SNOWFALL AMOUNTS SOMEWHERE IN THE CWA. ON THE HIGH EXTREME FOR
QPF...THERE IS POTENTIAL FOR SIGNIFICANT SNOWFALL...BUT /AS
MENTIONED PREVIOUSLY/ WILL JUST MENTION MODERATE AMOUNTS FOR NOW.
&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY AFTERNOON)
ISSUED AT 112 PM EDT SUN APR 13 2014

MVFR CONDITIONS WILL CONTINUE THROUGH THE PERIOD AT IWD WITH UPSLOPE
FLOW OFF OF LAKE SUPERIOR. CONDITIONS WILL SLOWLY IMPROVE TO MVFR
THIS AFTERNOON AT CMX AS DRIER AIR SLOWLY WORKS INTO THE AREA. A SFC
LOW IS FCST TO MOVE FROM THE PLAINS INTO THE GREAT LAKES TONIGHT AND
SAW WILL BE IN THE LOCATION OF THE NW EDGE OF THE ACCOMPANYING PCPN
AREA AND EXPECT A RETURN OF SOME SN/IFR/LIFR CONDITIONS THIS
EVENING.
&&

.MARINE...(FOR THE 4 PM LAKE SUPERIOR FORECAST ISSUANCE)
ISSUED AT 343 PM EDT SUN APR 13 2014

NORTH GALE FORCE GUSTS TO 35 KNOTS ARE EXPECTED ON MONDAY IN THE
WAKE OF A LOW PRESSURE SYSTEM THAT WILL MOVE FROM SAGINAW BAY MONDAY
MORNING TO CENTRAL QUEBEC. HOISTED A GALE WARNING FOR THE EASTERN
AND CENTRAL LAKE SUPERIOR FOR MONDAY. PRESSURE GRADIENT WEAKENS BY
MONDAY NIGHT TO RESULT IN WINDS LESS THAN 25 KNOTS BY THAT TIME.
WINDS CURRENTLY FORECAST TO STAY MAINLY BLO 20 KNOTS REST OF THE
WEEK.
&&

.HYDROLOGY...
ISSUED AT 326 PM EDT SUN APR 13 2014

WITH COOLER TEMPERATURES YESTERDAY AND MUCH COOLER TEMPERATURES
TODAY INTO EARLY THIS WEEK...SNOWMELT HAS SLOWED SIGNIFICANTLY AND
MAY STOP ALTOGETHER OVER THE COMING FEW DAYS. GIVEN ADDITIONAL
OPPORTUNITIES FOR PRECIPITATION THIS WEEK AND WITH 4-9 INCHES OF
SNOW WATER EQUIVALENT STILL OVER PARTS OF WESTERN AND CENTRAL UPPER
MICHIGAN...THERE WILL BE PLENTY OF WATER AVAILABLE FOR THE SECOND
PERIOD OF SNOW MELT OVER THE NEXT COUPLE OF WEEKS. APPEARS THE
WARMER TEMPS WHICH COULD START UP THE NEXT PERIOD OF SNOWMELT/RUNOFF
BY NEXT WEEKEND.
&&

.MQT WATCHES/WARNINGS/ADVISORIES...
UPPER MICHIGAN...
  WINTER WEATHER ADVISORY FROM 2 AM TO 2 PM EDT MONDAY FOR MIZ006-
     007-085.

LAKE SUPERIOR...
  GALE WARNING FROM 8 AM TO 5 PM EDT MONDAY FOR LSZ266-267.

  GALE WARNING FROM 8 AM TO 2 PM EDT MONDAY FOR LSZ244-245-264-265.

LAKE MICHIGAN...
NONE.
&&

$$

SHORT TERM...07
LONG TERM...TITUS
AVIATION...07
MARINE...07
HYDROLOGY...TITUS






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