Friday: A slight chance of sprinkles before 10am. Mostly sunny, with a high near 74. North northeast wind around 5 mph becoming east in the morning.
Friday Night: Partly cloudy, with a low around 57. East northeast wind around 5 mph becoming calm in the evening.
Saturday: Partly sunny, with a high near 77. Southeast wind 5 to 10 mph.
Saturday Night: Mostly cloudy, with a low around 61. South southeast wind 5 to 10 mph.
Sunday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78.
Sunday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Monday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 75.
Monday Night: A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 61.
Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 77.
Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 61.
Wednesday: Mostly sunny, with a high near 78.
Wednesday Night: Partly cloudy, with a low around 62.
Thursday: Mostly sunny, with a high near 78.
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
234 PM CDT Thu Aug 24 2017
.SHORT TERM... 233 PM CDT
Through Friday...
Latest radar imagery depicting only isolated showers remaining across portions of northwest Indiana, and the southern end of Lake Michigan. Large scale ascent has diminished with the departure of the mid level wave, with low level convergence also weakening over the southern end of the lake. Other than a few light showers over the next 1-2 hours, expect generally dry conditions. Sky cover in place will also diminish, however, setup would favor for additional scattered clouds to continue to spill off the lake late this afternoon into the evening. This is already evident, with cu still noted over much of the lake at this time. Did increase cloud cover to keep at least partly cloudy mention into this early evening, but may need to increase more than currently forecast.
High pressure will spread south across the region through the period, with generally dry/quiet conditions expected and with another cool night of below normal temps likely tonight. A few items that will need to be monitored will be for lake effect clouds to possibly continue spilling into areas near the lake tonight into Friday morning, as well as the possibility for at least sprinkles. Guidance not really showing much of either at this time, but with another push of slightly cooler air over the lake, thermally induced surface trough looks to develop once again over the southern end of the lake. This could support some enhanced cloud development along with isolated light showers, especially late tonight into early Friday morning. Lower confidence with this solution, but did maintain partly cloudy skies with a sprinkle mention for areas near the lake. This possibility should end by mid/late morning, with temps in the 70s expected Friday.
Rodriguez
&&
.LONG TERM... 151 PM CDT
Friday night through Thursday...
Surface ridge axis will shift to our east Friday night through Saturday night allowing return flow to overspread the region resulting in slightly warmer temps into the mid to upper 70s and dew points creeping back up to around 60. Expect dry weather through this time frame, but we should see increasing cloud cover Friday into Saturday as a wave takes shape upstream.
Through the day Sunday, strong upper wave is expected to dig into the western Great Lakes, closing off and slowly rotating across the local area Monday night into Tuesday. Mid level lapse rates will steepen as this occurs resulting in renewed precip chances Sunday through Tuesday. Best chances still appear to be Sunday afternoon and evening as a weak surface trough advances through the area, and chances appear more diurnally favored Monday and Tuesday.
Closed upper low is progged to shift off to our east around midweek. Precip chances will diminish behind the upper wave, but expect temperatures to remain fairly steady state with highs in the mid to upper 70s still under the influence of longwave troughing in place across the Great Lakes and eastern CONUS.
Deubelbeiss
&&
.AVIATION... For the 18Z TAFs...
Latest radar imagery depicting any lingering shower development staying just to the east of the terminals at this time. This trend will likely continue, however, GYY may see a brief shower pass nearby over the next couple of hours. VFR conditions expected to persist at this time, but am monitoring the potential for some continued lake effect cloud development tonight into Friday morning. Low confidence with these clouds, and have only included a scattered mention during this time. A few sprinkles will also be possible. Winds finally shifting to the northeast, with this trend continuing over the next hour. Gusts also possible today with speeds diminishing tonight, while a northeast wind is favored for the remainder of the period.
Rodriguez
&&
.MARINE... 151 PM CDT
High pressure is stretched from Hudson Bay south across Wisconsin and into the lower Ohio River Valley. This high will slowly move eastward and cross Lake Michigan through the weekend. Steadiest winds will be into tonight but speeds will begin to slacken late then be on the light side into Saturday. Direction through tonight will primarily be north turning northeast and east but may see another weak low pressure circulation set up over the southern part of the lake some time tonight. South to southeast winds will gradually increase later Saturday as the high shifts east and low pressure moves from the central Plains into Minnesota. Speeds will further increase into Sunday as the low moves into northern Wisconsin. The low then begins to weaken and meanders southward down the lake early next week. Confidence in forecast details lowers through the weekend as Hurricane Harvey will be interacting with larger scale features which may lead to differences in track and timing of features.
&&
.LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None.
MORE BELOW
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ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 252015- 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- 310 PM CDT Thu Aug 24 2017 /410 PM EDT Thu Aug 24 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...Tonight.
WEATHER HAZARDS EXPECTED:
High Swim Risk.
DISCUSSION:
High waves will result in a heightened risk of rip currents through this evening.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Sunday through Wednesday... Limited Thunderstorm Risk.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be necessary through tonight.
LAKESHORE HAZARD MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 325 PM CDT THU AUG 24 2017
ILZ006-014-INZ001-002-250200- /O.NEW.KLOT.BH.S.0015.170824T2025Z-170825T0200Z/ LAKE IL-COOK-LAKE IN-PORTER- 325 PM CDT THU AUG 24 2017
...BEACH HAZARDS STATEMENT IN EFFECT UNTIL 9 PM CDT THIS EVENING...
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A BEACH HAZARDS STATEMENT...WHICH IS IN EFFECT UNTIL 9 PM CDT THIS EVENING.
* LOCATION...ILLINOIS AND NORTHWEST INDIANA LAKE MICHIGAN BEACHES.
* FORECAST WAVE HEIGHTS...3 TO 5 FEET.
* STRONG RIP CURRENTS AND STRUCTURAL CURRENTS EXPECTED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
LIFE THREATENING WAVES AND CURRENTS ARE EXPECTED AT THE BEACHES. PEOPLE VISITING THE BEACHES SHOULD STAY OUT OF THE WATER.
RIP CURRENTS ARE POWERFUL CHANNELS OF WATER FLOWING QUICKLY AWAY FROM SHORE, WHICH OCCUR MOST OFTEN AT LOW SPOTS OR BREAKS IN SANDBARS. RIP CURRENTS CAN SWEEP YOU INTO DEEPER WATER.
STRUCTURAL CURRENTS FORM ALONG PIERS WHERE LONGSHORE CURRENTS AND WAVE ACTION FLOW INTO THE STRUCTURE. STRUCTURAL CURRENTS CAN SWEEP YOU INTO DEEPER WATER ALONG THE PIER STRUCTURE.
EXPOSED BEACHES ARE MORE LIKELY TO EXPERIENCE THE MOST SIGNIFICANT WAVE AND CURRENT IMPACTS. IMPACTS AT BEACHES WITH PROTECTIVE BREAKWALLS OR JETTIES WILL BE SUBJECT TO THE ORIENTATION OF STRUCTURES AS WELL AS WIND AND WAVE DIRECTION.
FOR INFORMATION ON SWIM ADVISORIES OR BANS AT CHICAGO BEACHES VISIT: WWW.CPDBEACHES.COM.