Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 230743

Area Forecast Discussion
National Weather Service Northern Indiana
343 AM EDT Wed May 23 2018

Issued at 341 AM EDT Wed May 23 2018

High pressure will remain across the area through the end of the
week. This system will bring dry conditions and increasingly
warm temperatures. Areas of fog and low clouds are likely this
morning, mainly across northwest Indiana and southwest Lower
Michigan. Highs today will be in the upper 70s to around 80
degrees, cooler near Lake Michigan. By the upcoming holiday
weekend highs will be in the 80s to around 90. There is also a
slight chance for mainly afternoon and evening showers or
thunderstorms this weekend.


.SHORT TERM...(Today and Tonight)
Issued at 333 AM EDT Wed May 23 2018

Primary emphasis on modified marine layer with inland extent
across northwest CWA. Moist boundary layer and temps several
degrees below crossover allowing areas of dense fog/stratus to
envelop Laporte/Berrien Counties. Farther inland expect more
patchy nature/more diffuse marine layer and while upstream
convective debris may limit further temp fall, will continue to
assess for potential areal expansion next couple hours.


.LONG TERM...(Thursday through Tuesday)
Issued at 333 AM EDT Wed May 23 2018

Weak boundary to slide southward through the Upper Great Lakes
associated with shortwave spur through high belted northern stream
flow for slight chance shra/tsra this weekend, primarily tied to
diurnal heat/instability cycle. Otherwise split flow dominates
with stagnating surface airmass with incremental increases in
heat/humidity through the weekend. Eventual impact as tropical
disturbance remnants lift northward still likely beyond current
forecast timeframe.


.AVIATION...(For the 06Z TAFS through 06Z Wednesday Night)
Issued at 113 AM EDT Wed May 23 2018

Areas of fog were over southern Lake Michigan and extended inland
to near Laporte. Temperatures had already fallen significantly
below the crossover temperature. Ideal conditions for radiation
fog will persist the rest of the night. Expect the lake fog to
expect inland as radiation fog develops over the rest of the area.
Conditions will improve this morning with daytime heating


IN...Dense Fog Advisory until 9 AM CDT this morning for INZ003.

MI...Dense Fog Advisory until 10 AM EDT this morning for MIZ077.

LM...Dense Fog Advisory until 10 AM EDT this morning for LMZ043-046.



LONG TERM...Murphy

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