Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Overcast

73°F

23°C

Humidity	90%
Wind Speed	E 3 mph
Barometer	30.04 in (1015.8 mb)
Dewpoint	70°F (21°C)
Visibility	10.00 mi
Last update	17 Aug 1:51 am CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

McHenry IL

Flood Advisory until August 17, 04:00am

Click here for hazard details and duration

Flood Advisory

Flood Advisory until August 17, 04:00am
NOW until 4:00am Sun
Flood Advisory
Overnight
Low: 71 °F
T-storms
Likely
Sunday
High: 78 °F
Chance
T-storms then
Partly Sunny
Sunday Night
Low: 67 °F
Partly Cloudy
Monday
High: 89 °F
Chance
T-storms
Monday Night
Low: 70 °F
T-storms
Likely
Tuesday
High: 86 °F
Chance
T-storms
Tuesday Night
Low: 65 °F
Mostly Cloudy
Wednesday
High: 77 °F
Partly Sunny

Detailed Forecast

Overnight

Showers and thunderstorms likely, mainly before 4am. Mostly cloudy, with a low around 71. West northwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday

A 30 percent chance of showers and thunderstorms before 10am. Partly sunny, with a high near 78. Northeast wind 5 to 10 mph.

Sunday Night

Partly cloudy, with a low around 67. East northeast wind around 10 mph.

Monday

A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89. South southeast wind around 10 mph, with gusts as high as 15 mph.

Monday Night

Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 70. South southeast wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 60%.

Tuesday

A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 86.

Tuesday Night

Mostly cloudy, with a low around 65.

Wednesday

Partly sunny, with a high near 77.

Wednesday Night

Partly cloudy, with a low around 62.

Thursday

Sunny, with a high near 80.

Thursday Night

Mostly clear, with a low around 60.