Area Forecast Discussion
Issued by NWS Northern Indiana

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000
FXUS63 KIWX 251938
AFDIWX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
338 PM EDT MON MAY 25 2015

.SYNOPSIS...
ISSUED AT 1135 AM EDT MON MAY 25 2015

SCATTERED SHOWERS WILL DIMINISH LATER THIS AFTERNOON AS AN UPPER
LEVEL DISTURBANCE SWEEPS NORTHEAST THROUGH THE AREA.
OTHERWISE...WINDY CONDITIONS WILL CONTINUE THIS AFTERNOON WITH
SOME DECREASE IN CLOUDS EXPECTED FOR MID TO LATE AFTERNOON.
THUNDERSTORMS WILL BECOME MORE LIKELY BY LATE TUESDAY AS ANOTHER
UPPER LEVEL DISTURBANCE MOVES ACROSS THE AREA. MORE STORMS ARE
POSSIBLE LATE THIS WEEK AND THROUGH THIS COMING WEEKEND. HIGHS
THIS WEEK SHOULD BE MAINLY IN THE UPPER 70S TO MID 80S WITH LOWS
AROUND 60 TO THE MID 60S.

&&

.SHORT TERM...(THIS EVENING THROUGH TUESDAY)
ISSUED AT 338 PM EDT MON MAY 25 2015

DRY SLOT ASSOCIATED WITH VORT MAX CURRENTLY LIFTING INTO THE
NORTHERN GREAT LAKES IS BRINGING AN END TO SCT SHOWERS FROM WEST
TO EAST AS PLANNED. MAIN STORY THIS AFTERNOON HAS BEEN GUSTY WINDS
WITH PBL MIXING JUST DEEP ENOUGH TO MIX DOWN SOME GUSTS AROUND 35
KTS...AIDED IN SOME SPOTS BY LINE OF CONVECTIVE SHOWERS. LLJ IS
GRADUALLY WEAKENING THIS AFTERNOON THOUGH AS PARENT WAVE LIFTS
NORTHEAST AND GRADIENT RELAXES. LATEST SURFACE OBS INDICATE A
SLIGHT DOWNWARD TREND IN AMBIENT WIND GUSTS AND EXPECT THAT TREND
TO CONTINUE AND ACCELERATE INTO THE EVENING HOURS. SUBTLE
SHORTWAVE RIDGING AND LOSS OF DEEPER MOISTURE WILL KEEP CONDITIONS
DRY OVERNIGHT. PARTIAL CLEARING EXPECTED BUT STEADY SOUTHWEST WIND
AND INCREASING CLOUDS TOWARD DAYBREAK SHOULD KEEP OVERNIGHT LOWS
GENERALLY IN THE MID 60S.

ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS IS EXPECTED TOMORROW AS
FORMIDABLE SHORTWAVE CURRENTLY OVER THE SOUTHERN PLAINS LIFTS
NORTHEAST. WAVE WILL BE INCREASINGLY SHEARED AS IT MOVES THROUGH THE
WESTERN GREAT LAKES AND BEST CVA DOES PASS JUST TO OUR NORTHWEST BUT
SHOULD BE ENOUGH FORCED ASCENT TO TOUCH OFF FAIRLY WIDESPREAD
CONVECTION. THIS IS ESPECIALLY TRUE GIVEN EXPECTATION FOR ANOTHER
SURGE IN LOW LEVEL THETA-E WITH INCREASING LLJ. MODEST
DESTABILIZATION WILL ALSO OCCUR WITH INCREASING LOW LEVEL MOISTURE
AND DIURNAL HEATING. MOST OF LATEST GUIDANCE SHOWS AT LEAST SCT
CONVECTION WITH THE BEST CHANCES BEGINNING AROUND NOON AND
CONTINUING THROUGH THE EVENING. INHERITED LIKELY POPS SEEM
APPROPRIATE AND ONLY MINOR CHANGES MADE TO ADD SOME TEMPORAL DETAIL.
SEVERE WEATHER RISK REMAINS LOW. 0-6KM BULK SHEAR VALUES ARE AROUND
30 KTS WHICH IS MARGINALLY SUPPORTIVE OF ORGANIZED CONVECTION BUT
POOR MIDLEVEL LAPSE RATES LIMIT 0-1KM MLCAPE VALUES TO AROUND 1000
J/KG OR LESS. A FEW STRONG STORMS MAY CERTAINLY BE POSSIBLE BUT
WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME.

&&

.LONG TERM...(TUESDAY NIGHT THROUGH MONDAY)
ISSUED AT 338 PM EDT MON MAY 25 2015

SHEARING MID LEVEL SHORTWAVE LIFTING NORTHEAST THROUGH THE
WESTERN/NORTHERN LAKES WILL FORCE A WEAK/TRAILING SFC BOUNDARY
THROUGH THE AREA WEDNESDAY INTO WEDNESDAY EVENING. MODELS IN GOOD
AGREEMENT IN SHUNTING DEEPER MOISTURE EAST OF THE AREA BY THIS
TIME...BUT WITH SOME PARTIAL CLEARING AND BOUNDARY LAYER
HEATING/DESTABILIZATION WOULD EXPECT SCT CONVECTION TO DEVELOP INVOF
THIS FEATURE BY WEDNESDAY AFTERNOON (BEST CHANCES SOUTHERN/EASTERN
ZONES REMOVED FROM STABLE LAKE MI PUSH).

WEAK ANTICYCLONIC FLOW/SHORTWAVE RIDGING WILL PROMOTE A PERIOD OF
FAIR WX LATER WEDNESDAY NIGHT THROUGH FRIDAY MORNING. LITTLE IN THE
WAY OF THERMAL ADVECTION COMBINED WITH AMPLE SUNSHINE WILL SUPPORT A
MILD THURSDAY...ALTHOUGH DIURNAL RANGES WILL BE A LITTLE GREATER
GIVEN INFILTRATION OF SLIGHTLY DRIER AIR. LATER FRIDAY INTO THE
WEEKEND WILL FEATURE RENEWED SHOWER/STORM CHANCES AS A STRONG
NORTHERN STREAM PV ANOMALY TRACKING THROUGH SE CANADA FORCES AN
ACTIVE BAROCLINIC ZONE SOUTH INTO THE LOCAL AREA...WITH MOISTURE
CONVERGENCE/ADVECTION ENHANCED IN ADVANCE OF AN APPROACHING PLAINS
UPPER WAVE.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON)
ISSUED AT 120 PM EDT MON MAY 25 2015

CONDITIONS WILL CONTINUE TO HOVER IN LOW END VFR CATEGORY THROUGH
THE LATE AFTERNOON AS A SHORTWAVE LIFTS ACROSS THE REGION. A FEW
SCT SHOWERS ASSOCIATED WITH THIS FEATURE ARE ALSO CURRENTLY MOVING
ACROSS NORTHERN INDIANA. THESE SHOWERS WILL EXIT DURING THE NEXT
1-2 HOURS BUT UPSTREAM OBS STILL SHOW SPORADIC MVFR STRATOCU
THROUGH WESTERN ILLINOIS. THIS LOW LEVEL MOISTURE WILL LIKELY NOT
SCATTER OUT UNTIL LATER THIS EVENING. MAINLY VFR CONDITIONS
EXPECTED OVERNIGHT BUT NEXT WAVE WILL BE QUICKLY APPROACHING.
INCREASING LOW LEVEL MOISTURE AND BOUNDARY LAYER COOLING COULD
LEAD TO SOME FUEL ALTERNATE STRATUS BY EARLY TOMORROW MORNING PER
LATEST GFS AND NAM FORECAST SOUNDINGS/MOS GUIDANCE. WILL HOLD WITH
HIGH END MVFR FOR NOW AND LET LATER SHIFTS ADJUST AS NECESSARY.
SHOWERS AND THUNDERSTORMS ALSO POSSIBLE BY THE VERY END OF THIS
TAF PERIOD.


&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...NONE.
MI...BEACH HAZARDS STATEMENT UNTIL 8 PM EDT THIS EVENING FOR MIZ077.

OH...NONE.
LM...SMALL CRAFT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR LMZ043-046.

     GALE WARNING UNTIL 4 PM EDT THIS AFTERNOON FOR LMZ043-046.

&&

$$

SYNOPSIS...MARSILI/SKIPPER
SHORT TERM...AGD
LONG TERM...STEINWEDEL
AVIATION...AGD


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