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Illinois, Cook

Air Quality Alert

Statement as of 1:40 PM CDT on July 26, 2016

Expires 1:00 AM EDT on July 28, 2016


... Air quality alert in effect on Wednesday...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for the greater Chicago
metropolitan area and is in effect for Wednesday.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the
air quality index.

Active children and adults especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Participants in the... partners for clean air program... are requested
to initiate their activities. Residents are also urged to reduce
pollution levels. Aqi forecast and tips on how you can reduced your
emissions can be found at www.Cleantheair.Org.

Information and aqi levels can also be found at www.EPA.State.IL.US
and at www.Airnow.Gov. Media contact... 217 299 6057.



140 PM CDT Tue Jul 26 2016

... Air quality alert in effect on Wednesday...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for the greater Chicago
metropolitan area and is in effect for Wednesday.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the
air quality index.

Active children and adults especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Participants in the... partners for clean air program... are requested
to initiate their activities. Residents are also urged to reduce
pollution levels. Aqi forecast and tips on how you can reduced your
emissions can be found at www.Cleantheair.Org.

Information and aqi levels can also be found at www.EPA.State.IL.US
and at www.Airnow.Gov. Media contact... 217 299 6057.



Local Storm Report



07/24/2016 0607 PM

Skokie, Cook County.

Thunderstorm wind gust e50.00 mph, reported by amateur radio.





07/24/2016 0629 PM

Humboldt Park, Cook County.

Thunderstorm wind damage, reported by public.


            Numerous large branches down. Estimated time per radar.




07/24/2016 0638 PM

6 miles N of Chicago, Cook County.

Hail e1.00 inch, reported by trained spotter.


            Quarter size hail near Buena Park.




07/24/2016 0640 PM

3 miles NNW of Chicago, Cook County.

Thunderstorm wind damage, reported by Emergency Mngr.


            Wires downed onto l Brown line. Radar estimated time.




07/24/2016 0640 PM

1 miles W of Chicago, Cook County.

Thunderstorm wind damage, reported by Emergency Mngr.


            Delayed report. Racine blue line station canopy collapsed
            due to wind... with the structure falling onto the third
            rail apparently causing the sparking and explosions seen
            on video. Confirmed with Chicago oemc.




07/24/2016 0644 PM

Chicago, Cook County.

Thunderstorm wind damage, reported by Emergency Mngr.


            Multiple street lights damaged. Radar estimated time.




07/24/2016 0644 PM

1 miles SSE of Chicago, Cook County.

Thunderstorm wind gust m73.00 mph, reported by broadcast media.


            At Michigan and Roosevelt in the south loop




07/24/2016 0640 PM

1 miles W of Chicago, Cook County.

Thunderstorm wind damage, reported by Emergency Mngr.


            Delayed report. Racine blue line station canopy collapsed
            due to wind... with the structure falling onto the third
            rail apparently causing the sparking and explosions seen
            on video. Confirmed with Chicago oemc.



Public Information Statement

Statement as of 11:59 AM CDT on July 26, 2016


... Extremely high dew points observed on Sunday...

Dew points are a direct measure of moisture in the air, with
values in the 70s or higher associated with an oppressively humid
air mass. Sunday July 24th brought dew points in the upper 70s to
lower 80s across northern Illinois, which is basically at the
highest end of what can be observed. The setup for these extremely
humid conditions was ideal with a persistent warm air mass able
to hold ample water, southerly winds on Sunday advecting more
moisture into the area, wet ground and even standing water from
recent rains, and evapotranspiration from mature crops.

Here is a look at dew points in Rockford and Chicago and how they
compared to records and climatology:

-----------------------------------------------------------------

Rockford (krfd)

The dew point peaked at 81 degrees at 7 PM on Sunday July 24th.

- A dew Point of 81 degrees or higher has only been observed on
22 hourly observations since 1970. The last time was 8 PM on
August 2, 2011.

- There have only been three high dew point episodes (periods of
hours) with values that high since 1970. They were July 13-14
1995, July 29-30 1999, and August 2 2011.

- The highest dew point observed since 1970 was 83 degrees on July
13 1995.

-----------------------------------------------------------------

Chicago (kord)

The dew point peaked at 78 degrees at 1 PM and 5 PM on Sunday
July 24th at chicago's official observing site of o'hare
international Airport.

- The last time a dew Point of 78 degrees or higher was observed
was on July 19, 2011. Prior to that was August 1 2002.

- The highest dew point observed in chicago's period of record
was 83 degrees on July 30 1999.

As a note, Chicago midway international Airport had peaked at a
dew Point of 79 degrees at 5 and 6 PM on Sunday July 24th. This
was the highest dew point observed at midway since June 29 2012.



Weather Severe Map
Alaska - Areal Flood Watch , Areal Flood Advisory , Special Statement , Record Report
Arizona - Areal Flood Advisory , Air Quality Alert
Arkansas - Heat Advisory
California - Special Statement
Colorado - Public Information Statement
Connecticut - Special Statement , Record Report , Public Information Statement
Delaware - Heat Advisory , Record Report
District of Columbia - Record Report
Florida - Coastal Hazard Statement
Georgia - Record Report , Public Information Statement
Idaho - Fire Weather Warning , Record Report
Illinois - Air Quality Alert , Special Statement , Public Information Statement
Indiana - Flash Flood Warning, Areal Flood Warning , Air Quality Alert , Public Information Statement
Kansas - Record Report
Kentucky - Flood Watch / Flood Statement , Flash Flood Watch , Special Statement
Louisiana - Areal Flood Advisory , Special Statement
Maine - Special Statement
Maryland - Heat Advisory , Record Report
Massachusetts - Special Statement , Public Information Statement
Mississippi - Heat Advisory
Missouri - Flash Flood Warning , Heat Advisory , Special Statement , Record Report
Montana - Record Report
Nevada - Heat Advisory , Record Report , Public Information Statement
New Jersey - Record Report
New Mexico - Areal Flood Advisory , Record Report
New York - Heat Advisory , Record Report , Public Information Statement
North Carolina - Heat Advisory , Special Statement , Record Report , Public Information Statement
North Dakota - Tornado Warning
Ohio - Severe Thunderstorm Warning , Flash Flood Warning , Flood Watch / Flood Statement , Areal Flood Advisory , Flash Flood Watch , Special Statement
Oklahoma - Areal Flood Advisory
Oregon - Record Report
Pennsylvania - Record Report , Public Information Statement
Puerto Rico - Flood Watch, Areal Flood Advisory
Rhode Island - Special Statement
South Carolina - Heat Advisory , Public Information Statement
South Dakota - Flash Flood Warning , Special Statement
Tennessee - Heat Advisory , Special Statement , Record Report
Texas - Areal Flood Advisory , Air Quality Alert , Special Statement , Record Report
Utah - Public Information Statement
Vermont - Public Information Statement
Virginia - Heat Advisory , Special Statement , Record Report
Washington - Record Report
West Virginia - Flash Flood Watch , Special Statement , Record Report
Wyoming - Record Report

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