Click for a description of this product Click to evaluate this product

Dangerous Heat Likely This Week

Wednesday, July 17, 2019 4:36 AM

• Period of dangerous heat likely Thursday thru Saturday, w/ highest confidence in heat Friday

• Maximum afternoon peak heat indices of 106-113°• Lows in the mid-upper 70s, around 80° for Chicago, w/ min heat

indices likely staying at or above 75 degrees from THU-SAT• Additional Heat Advisories, & Excessive Heat Warnings, will likely

be issued area wide in coming days

Excessive Heat Watch expanded for much of N IL and NW IN Thursday thru Saturday. Heat Advisory in effect for locations near the IL/WI border Thursday thru Friday

Weather Message of the Day:

Important Forecast Changes

National Weather ServiceChicago, IL Situation ReportWednesday, July 17, 2019 4:36 AM

Event Impacts

Click for a description of this product Click to evaluate this product

Hazards: Peak afternoon heat indices between 105° and 110° likely in the

Advisory area and 106° to 113° in the Watch area. Oppressively warm & humid

conditions at night offering little relief from the heat.

Timing & Duration: Heat expected to begin Thursday, peak Friday, and likely

continue into Saturday. Slightly cooler temps possible Sunday.

Certainty & Considerations: Some potential exists for thunderstorms or

thunderstorm outflow to limit the heat potential a bit Thursday over far northern

and northeastern Illinois, mainly near the lake.

Confidence is high in heat Friday with no thunderstorms or lake cooling expected.

There is some uncertainty with how long heat wave will persist, though likely

continuing into Saturday.

Historical Perspective: Current forecast is for this upcoming heat wave to be the

most intense heat to impact the area since July of 2012.

National Weather ServiceChicago, IL Situation ReportWednesday, July 17, 2019 4:36 AM

Click for a description of this product Click to evaluate this product

Dangerous Heat Possible Later This Week

Thursday’s Forecast

National Weather ServiceChicago, IL Situation ReportWednesday, July 17, 2019 4:36 AM

Click for a description of this product Click to evaluate this product

Dangerous Heat Possible Later This Week

Friday’s Forecast

National Weather ServiceChicago, IL Situation ReportWednesday, July 17, 2019 4:36 AM

Click for a description of this product Click to evaluate this product

Dangerous Heat Possible Later This Week

Saturday’s Forecast

National Weather ServiceChicago, IL Situation ReportWednesday, July 17, 2019 4:36 AM

Click for a description of this product Click to evaluate this product

Weather Message of the Day:

Dangerous heat forecast Thursday through Saturday, with some relief from the heat

possibly arriving Sunday. Peak heat indices 106-113° with oppressively warm

temperatures at night offering little relief from the heat.

This

recommended

Heat Quick Facts and Preparedness:

Quick facts you should know about Heat:• Heat typically causes the most weather related fatalities, annually. The 10-year average for heat related fatalities is 97.

• The most vulnerable populations to heat are those 1) elderly, 2) living alone, and 3) without air conditioning. Check on

family and friends.

• Never leave a child or pet unattended in a vehicle, even with the windows down, even for just a minute. Leaving

windows open does not significantly decrease the heating rate.

• Know the symptoms, prevention, and emergency response to prevent heat-related illness and death.

Preparedness: Limit Exposure• Reschedule strenuous activities to the early morning or evening. Wear light weight and loose fitting clothing and drink

plenty of water. Take frequent breaks in shaded or air conditioned environments.

• Never leave anyone unattended in a vehicle, including pets.

• Check on the elderly, friends and neighbors, and those that live alone.

• If you don’t have air conditioning, consider finding locations that do have air conditioning.

• Heat stroke is an emergency, call 911.

• If you feel ill, get to a cooler place and seek medical attention if needed.

Practice HEAT SAFETY Wherever You Are! Look Before You Lock!

@NWSChicago NWS Chicago

Find Us On Social Media!

National Weather ServiceChicago, IL Situation ReportWednesday, July 17, 2019 4:36 AM