Severe Thunderstorm Warning 76, NWS Duluth, MN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
244 PM CDT WED JUL 30 2014

.SHORT TERM...(THIS EVENING THROUGH THURSDAY)
ISSUED AT 245 PM CDT WED JUL 30 2014

THE UNSTABLE NORTHWEST FLOW AND STEEP LAPSE RATES HAVE ALLOWED FOR
ANOTHER AFTERNOON OF SCATTERED SHOWERS...AND A FEW THUNDERSTORMS.
THE CONVECTION WILL CONTINUE THROUGH THE EARLY EVENING...THEN
DIMINISH THROUGH SUNSET WITH THE LOSS OF DIURNAL HEATING. WITH CAPE
VALUES AROUND 1000 J/KG...AND RELATIVELY LOW FREEZING
LEVELS...SOME HAIL IS EXPECTED WITH THE STRONGER STORMS THIS
AFTERNOON. THE MAIN THREAT FOR STRONG TO POSSIBLY A LOW-END SEVERE
STORM WILL BE OVER THE MN ARROWHEAD AND NRN WISCONSIN ZONES WHERE
0-6 KM SHEAR IS MOST FAVORABLE.

.LONG TERM...(THURSDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 245 PM CDT WED JUL 30 2014

THE EXTENDED PERIOD WILL FEATURE SIGNIFICANT UNCERTAINTY BEGINNING
SUNDAY. THE GFS AND ECMWF CONTINUE TO OFFER DIFFERENT SOLUTIONS FROM
SUNDAY THROUGH WEDNESDAY REGARDING A FRONTAL BOUNDARY AND WHERE IT
HANGS UP.

AN UPPER LEVEL LOW OVER/NEAR JAMES BAY THURSDAY NIGHT WILL MOVE
NORTHEAST LATE IN THE WEEK INTO THE WEEKEND. A WEAK SURFACE LOW WILL
BE OVER THE NORTHLAND THURSDAY NIGHT/FRIDAY...THEN IS FORECAST TO
WEAKEN. WE EXPECT SOME SHOWERS/STORMS TO DEVELOP ONCE AGAIN FRIDAY
AFTERNOON OVER PORTIONS OF THE NORTHLAND...WITH SOUTHERN AREAS
SEEING THE HIGHEST PROBABILITY. THE PRECIP WILL END FRIDAY NIGHT AND
MUCH OF THE REGION WILL REMAIN DRY INTO SATURDAY. A FRONTAL BOUNDARY
WILL THEN MOVE INTO NORTHWEST MINNESOTA SATURDAY AFTERNOON BRINGING
A CHANCE FOR SHOWERS/STORMS TO WESTERN PORTIONS OF THE CWA.

THE MODELS DIVERGE IN HOW FAR SOUTH THEY BRING THIS BOUNDARY...WITH
THE ECMWF CONSISTENTLY FURTHER SOUTH THAN THE GFS. THIS WILL HAVE A
BIG IMPACT ON THE REGIONS WEATHER AS INSTABILITY AND LIFT WILL BE
SIGNIFICANT ALONG THE FRONT. THE MODELS ARE INDICATING HEAVY RAIN AS
SEVERAL ROUNDS OF THUNDERSTORMS WILL OCCUR LATE IN THE WEEKEND INTO
THE MIDDLE OF NEXT WEEK ALONG THIS BOUNDARY. AT THIS TIME WE HAVE
SOME POPS FOR THE SUNDAY-WEDNESDAY PERIOD ACROSS MUCH OF THE
CWA...WITH HIGHEST CHANCES MOST TIMES OVER SOUTHERN AREAS CLOSER TO
THE BOUNDARY. THE PERIOD BEARS CLOSE MONITORING AS HEAVY RAIN/SEVERE
WEATHER WILL BE ASSOCIATED WITH THIS BOUNDARY. IF THE ECMWF IS
CORRECT MUCH OF THE STRONGER STORMS WILL REMAIN SOUTH OF OUR
CWA...AND THE GFS SOLUTION PUTS OUR CWA IN THE CROSSHAIRS.

EXPECT HIGH TEMPERATURES FROM THE MID SEVENTIES TO LOWER EIGHTIES
FOR MOST AREAS. THE WARMEST TEMPERATURES SHOULD OCCUR SATURDAY
BEFORE THE FRONTAL BOUNDARY MOVES IN.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z THURSDAY AFTERNOON)
ISSUED AT 1237 PM CDT WED JUL 30 2014

SCATTERED SHOWERS/STORMS WILL DEVELOP THIS AFTERNOON ACROSS
CENTRAL AND EASTERN PORTIONS OF THE NORTHLAND. THE STRONGER STORMS
WILL PRODUCE A BRIEF PERIOD OF MVFR OR POSSIBLY IFR CONDITIONS.

THE SHOWERS/STORMS WILL END LATER THIS EVENING AND SKIES WILL
BECOME CLEAR TO PARTLY CLOUDY. SOME FOG WILL ONCE AGAIN BE
POSSIBLE LATER TONIGHT AS WINDS GO LIGHT.

&&

.PRELIMINARY POINT TEMPS/POPS...
DLH  51  79  56  77 /  30  20  10  20
INL  49  79  52  79 /  10  20  10  10
BRD  54  82  57  81 /  10  20  10  30
HYR  50  81  54  79 /  40  30  20  50
ASX  48  74  53  74 /  40  20  10  30

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
LS...NONE.
&&

SHORT TERM...GRANING
LONG TERM...MELDE
AVIATION...MELDE

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
1245 PM CDT WED JUL 30 2014

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-311745-
KOOCHICHING-NORTHERN ST. LOUIS-NORTHERN COOK/NORTHERN LAKE-
NORTHERN ITASCA-CENTRAL ST. LOUIS-SOUTHERN LAKE/LAKESHORE-
SOUTHERN COOK/LAKESHORE-NORTHERN CASS-SOUTHERN ITASCA-
SOUTHERN CASS-CROW WING-NORTHERN AITKIN-SOUTHERN AITKIN-
CARLTON/SOUTHERN ST. LOUIS-PINE-DOUGLAS-BAYFIELD-ASHLAND-IRON-
BURNETT-WASHBURN-SAWYER-PRICE-
1245 PM CDT WED JUL 30 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA AND
NORTHWEST WISCONSIN.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL TRACK SOUTH ACROSS MUCH OF THE
NORTHLAND THIS AFTERNOON...INTO EARLY EVENING. A FEW STORMS WILL
HAVE THE POTENTIAL TO PRODUCE SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A FEW THUNDERSTORMS ARE POSSIBLE AGAIN THURSDAY...AND LATER IN THE
WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED THIS AFTERNOON OR
TONIGHT.

LSZ121-140>148-311745-
BAYFIELD TO OAK POINT WI-GRAND PORTAGE TO GRAND MARAIS MN-
GRAND MARAIS TO TACONITE HARBOR MN-
TACONITE HARBOR TO SILVER BAY HARBOR MN-
SILVER BAY HARBOR TO TWO HARBORS MN-TWO HARBORS TO DULUTH MN-
DULUTH MN TO PORT WING WI-PORT WING TO SAND ISLAND WI-
SAND ISLAND TO BAYFIELD WI-OAK POINT TO SAXON HARBOR WI-
1245 PM CDT WED JUL 30 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF
WESTERN LAKE SUPERIOR.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A FEW THUNDERSTORMS WILL TRACK ACROSS PORTIONS OF WESTERN LAKE
SUPERIOR THIS AFTERNOON...INTO EARLY EVENING. A FEW STORMS WILL
HAVE THE POTENTIAL TO PRODUCE SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A FEW THUNDERSTORMS ARE POSSIBLE AGAIN THURSDAY...AND LATER IN
THE WEEKEND.

GRANING

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS:
HTTP://WWW.WEATHER.GOV/DULUTH (ALL LOWER CASE)

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