Tonight: Mostly clear, with a low around 72. South southeast wind around 5 mph.
Saturday: Sunny, with a high near 91. South southwest wind around 5 mph becoming southeast in the afternoon.
Saturday Night: Mostly clear, with a low around 68. Southeast wind around 5 mph.
Sunday: Sunny, with a high near 89. South wind around 5 mph.
Sunday Night: Mostly clear, with a low around 67.
Monday: Sunny, with a high near 88.
Monday Night: Mostly clear, with a low around 66.
Tuesday: Mostly sunny, with a high near 84.
Tuesday Night: A slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62.
Wednesday: A slight chance of showers and thunderstorms. Partly sunny, with a high near 74.
Wednesday Night: Mostly cloudy, with a low around 54.
Thursday: Mostly sunny, with a high near 70.
Amf Ohare IL 41.98°N 87.9°W
Area Forecast Discussion below ad ...
AREA FORECAST DISCUSSION
National Weather Service Chicago/Romeoville, IL
GO Current Forecast Discussion
ARCHIVED
600 AM CDT Fri Sep 22 2017
.SHORT TERM... 341 AM CDT
Through tonight...
Main forecast concerns/challenges are with continued warmth, as another day of temps well into the 90s are expected today. No big change in the air mass will support temps similar to Thursday, with low to mid 90s expected area wide. This will be supported by an abundance of sunshine, once early morning dense cirrus shifts to the east. Winds do turn onshore today, but think locations near the lake will rise to around 90 before this lake breeze cools temps down some. Dewpoints in the upper 60s will provide another humid day, with heat index values in the mid to upper 90s. Some guidance showing some isolated convection developing across the south/southeast CWA later this afternoon. However, would think that if anything does develop during this time, that it should stay just outside of the area.
Rodriguez
&&
.LONG TERM... 341 AM CDT
Saturday through Thursday...
Large upper level ridge and surface high will remain in place through the weekend, with similar conditions expected to persist. As some slight moderation to the air mass is expected, temps may not rise as high on Saturday. Still think many locations will have a chance at reaching the 90 degree mark though, with this a possibility on Sunday too. By early next week, upper level ridge shifts to the east while a trough moves through the central CONUS. As this trough and surface low push east through the region, will see precip chances returning late Tuesday into Wednesday. This will also be an end to the warmth, as a much cooler air mass will move in behind this system.
Rodriguez
&&
.AVIATION... For the 12Z TAFs...
No real big changes to the TAFs, as not anticipating any significant weather at the terminals. Mainly VFR conditions, outside of another period of patchy fog late tonight. Continued similar thoughts with lake breeze potential later this afternoon, and not include a wind shift at the terminals. However, the overall pattern will support more of a south southeast direction by early this evening.
Rodriguez
&&
.MARINE... 429 AM CDT
Mainly southerly winds in place across the lake as high pressure is situated to the east, and while low pressure is across the central Plains. This low will lift to Ontario today through tonight and as this occurs, expect winds to see an increase in speeds. This will especially be the case across the north half, with speeds dropping off the further south down the lake. With weak gradient/winds in place over the far southern portions of the lake, should see winds turn onshore across both the IL and IN nearshores. No real big change in the overall pattern will support similar wind direction/speeds through the weekend.
Rodriguez
&&
.LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None.
MORE BELOW
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Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 451 AM CDT Fri Sep 22 2017
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 231000- Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane- DuPage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston- Iroquois-Ford-Lake Indiana-Porter-Newton-Jasper-Benton- 451 AM CDT Fri Sep 22 2017 /551 AM EDT Fri Sep 22 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...Today and Tonight.
WEATHER HAZARDS EXPECTED:
Limited Excessive Heat Risk. Limited Fog Risk.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Tuesday and Wednesday... Limited Thunderstorm Risk.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be necessary through tonight.