Area Forecast Discussion
Issued by NWS Duluth, MN

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000
FXUS63 KDLH 180806
AFDDLH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
306 AM CDT SAT OCT 18 2014

.SHORT TERM...(TODAY THROUGH SUNDAY)
ISSUED AT 306 AM CDT SAT OCT 18 2014

HIGH PRESSURE EXTENDING FROM MANITOBA INTO THE DAKOTAS WILL MOVE
EAST TODAY OVER THE NORTHLAND...THEN CONTINUE TO MOVE EAST OF THE
REGION TONIGHT. A TROUGH OF LOW PRESSURE AND A SHORTWAVE WILL THEN
MOVE THROUGH THE REGION TONIGHT INTO SUNDAY.

LATEST RADAR SHOWS ECHO COVERAGE DIMINISHING OVER THE PAST FEW
HOURS...AND THIS IS IN LINE WITH LATEST MODEL GUIDANCE. THE
GRAVITY WAVE INDUCED AREA OF PRECIP OVER THE NORTH SHORE INTO THE
HEAD OF LAKE SUPERIOR HAS ENDED...AS FORECAST BY THE RAP DUE TO DECREASING
MOISTURE AND WIND SPEED. A FAVORABLE SET FOR LAKE EFFECT PRECIP
EXISTS ACROSS NORTHERN ASHLAND/IRON COUNTIES AS FAR AS FETCH AND
DELTA-T VALUES ARE CONCERNED THIS MORNING. HOWEVER...DEEPER MOISTURE
WILL BE QUITE LIMITED AND INVERSION LEVELS WILL BE LOWERING
THROUGH THE MORNING. WE WILL CARRY SOME POPS FOR A TIME THIS
MORNING...BUT THINK THE LACK OF MOISTURE WILL SHUT DOWN ANY LAKE
EFFECT LATER THIS MORNING. THERE WERE STILL PLENTY OF CLOUDS ACROSS THE
NORTHLAND AND UPSTREAM OVER NORTHWEST ONTARIO THIS MORNING. THE
RAP DOES SHOW THESE CLOUDS GRADUALLY DIMINISHING THROUGH THE
DAY...AND WE EXPECT CLEARING FOR MOST AREAS THROUGH THE DAY. MORE
SUN IS EXPECTED EARLIER FROM THE NORTH SHORE CLOSE TO THE LAKE
DOWN TOWARD THE TWIN PORTS DUE TO SUBSIDENCE DOWN THE HIGHER
TERRAIN.

CLEAR SKIES ARE EXPECTED THIS EVENING...THEN CLOUDS WILL INCREASE
AS A SHORTWAVE AND TROUGH OF LOW PRESSURE MOVE IN. THE AIRMASS IS
INITIALLY QUITE DRY...SO WE DELAYED ANY POPS UNTIL LATE TONIGHT
OVER NORTHERN AREAS. WE HAVE A CHANCE OVER THE EASTERN TWO THIRDS OF
THE REGION SUNDAY...WITH LOW POPS SOUTH AND HIGHER POPS FAR NORTH.
RAINFALL WILL BE QUITE LIMITED WITH THIS SYSTEM WITH MOST AREAS ONLY
RECEIVING A FEW HUNDREDTHS OF AN INCH.

.LONG TERM...(SUNDAY NIGHT THROUGH FRIDAY)
ISSUED AT 306 AM CDT SAT OCT 18 2014

A LOW PRESSURE SYSTEM WILL MOVE FROM NW ONTARIO TO THE CENTRAL GREAT
LAKES REGION SUNDAY NIGHT AND EARLY MONDAY. ITS COLD FRONT WILL PASS
THROUGH THE NORTHLAND. THERE COULD BE SOME LIGHT RAIN SHOWERS
OVER THE EASTERN FORECAST AREA SUNDAY NIGHT AND MONDAY.

A SURFACE RIDGE OF HIGH PRESSURE WILL MOVE INTO THE UPPER MIDWEST
MONDAY NIGHT AND TUESDAY. THE MID/UPPER LEVEL RIDGE WILL GRADUALLY
SHIFT FROM THE ROCKY MOUNTAINS ON MONDAY TO THE CENTRAL UNITED
STATES BY TUESDAY. THIS WILL BRING WARMER WEATHER TO THE REGION FOR
THE MIDDLE AND LATTER HALF OF THE WEEK. WHILE TEMPERATURES WILL BE
NEAR OR SLIGHTLY ABOVE NORMAL MONDAY...THEY WILL INCREASE TO ABOUT 5
TO 10 DEGREES ABOVE NORMAL FOR TUESDAY THROUGH FRIDAY.

A PASSING TROUGH OF LOW PRESSURE COULD BRING SHOWERS TO THE REGION
WEDNESDAY INTO THURSDAY. THE GFS AND GEM ARE MUCH DRIER THAN THE
ECMWF...SO THE LOW PCPN CHANCES IN THE FORECAST ARE PRIMARILY A
REFLECTION OF THE WETTER ECWMF.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z SATURDAY NIGHT)
ISSUED AT 1229 AM CDT SAT OCT 18 2014

MVFR CIGS WILL BE COMMON ACROSS ALL TAF SITES OVERNIGHT.  CIGS WILL
IMPROVE TO VFR BEGINNING AROUND 12Z AT INL...MID-MORNING ACROSS
HIB/BRD/DLH..AND LATE MORNING AT HYR AS AN AREA OF HIGH PRESSURE
BUILDS INTO THE FORECAST AREA.  CONDITIONS WILL STAY VFR THROUGH
SATURDAY NIGHT.


&&

.PRELIMINARY POINT TEMPS/POPS...
DLH  47  34  56  42 /   0  10  30  10
INL  46  37  58  40 /   0  20  30   0
BRD  50  40  62  42 /   0  10  10   0
HYR  48  31  56  41 /   0  10  20   0
ASX  47  31  55  42 /  10  10  30  10

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
LS...SMALL CRAFT ADVISORY UNTIL 10 AM CDT THIS MORNING FOR LSZ121-
     146>148.

     SMALL CRAFT ADVISORY UNTIL 5 AM CDT EARLY THIS MORNING FOR
     LSZ140.

&&

$$

SHORT TERM...MELDE
LONG TERM...GROCHOCINSKI
AVIATION...STEWART/GROCHOCINSKI





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