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Cook County, IL Weather and Climate Synopsis

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Weather Summary Hourly Observations Nowcast Agricultural Weather Outlook
7 Day Forecast Medium & Long Range Outlook Almanac Historical Facts

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A joint service of the UK Ag Weather Center and the National Weather Service.

Weather Summary For Central And Southeast Illinois
National Weather Service Lincoln IL
308 PM CDT Sun Jul 15 2018

Another warm and humid day throughout central Illinois occurred
today. Temperatures around the area this afternoon were in the
80s, with heat index values near 90.

With southerly winds this afternoon, moisture will continue to be
ushered into the region, developing more clouds and isolated
thunderstorms. Additional showers and thunderstorms will be
possible overnight, as the warm and humid conditions hold
overhead. As a cold front approaches the region Monday, more
widespread rainfall will be possible. Behind the front, drier
weather and lower humidities will arrive Tuesday and last through

Lows tonight, will range from the upper 50s and lower 60s across 
northwest sections of Iowa and Wisconsin, to the middle 70s across
southern Missouri and the lower Ohio River Valley. Highs Monday
will return to the mid and upper 80s, with humidity increasing
through the day.

National Ag. Weather Outlook, International Ag. Weather Summary
Current Surface Map, [2nd Source TWC]

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Regional Hourly Observations For COOK County
Issued at 800 PM CDT SUN JUL 15 2018

CHICAGO-OHARE  MOCLDY    84  72  67 E6        29.91S HX  89           
CHICAGO-MIDWAY MOCLDY    84  72  67 E7        29.91S HX  89           
AURORA         FAIR      81  76  84 NW3       29.92S HX  87           
LANSING*       FAIR      83  74  75 SW3       29.92S HX  89           
JOLIET*        FAIR      85  74  69 CALM      29.92R HX  93           
WAUKEGAN       FAIR      79  72  79 SE3       29.92S HX  82           
DUPAGE AIRPORT FAIR      83  73  72 W6        29.92S HX  89           
KANKAKEE*      FAIR      83  72  69 CALM      29.93S HX  88           
WHEELING       FAIR      83  73  72 E3        29.93S HX  89           
MORRIS*        FAIR      82  74  75 CALM      29.92R HX  88           
NORTHERLY ISL    N/A     77  72  84 CALM        N/A                   

Current Temperatures, Dewpoint Map, RH, Wind, Regional Obs, Surface 4-Panel
Meteograms : Springfield , Peoria , Quad City , Chicago (O'Hare) , Rockford

Current Agricultural Weather Conditions in Illinois
Based on observations at 800pm CDT, Sunday July 15, 2018

Across Illinois...temperatures are near 84 degrees north and near 85 degrees central. Current sky conditions are mostly cloudy north and mostly cloudy central. In the north, relative humidity is near 67%, and the dew point is near 72 degrees. The heat index is near 89 degrees north. In the central part of the state, relative humidity is near 80%, and the dew point is near 78 degrees. The heat index is near 96 degrees central. The livestock heat stress category is danger north, danger central, and unavailable south. Winds are from the east at 6 mph north, where conditions are favorable for spraying. Winds are from the north at 3 mph central, where conditions are favorable for spraying. Winds are unavailable south. Based on current available observations, the highest temperature is 85 degrees at Springfield and Decatur. The lowest temperature is CALM degrees at Northerly Island.

Current NOWCAST not available:
Nowcasts are not issued routinely during fair weather. Only when
precipitation or other significant weather is occuring in this county will these
forecasts be issued. Currently, there is no short term forecast in effect.

US Radar, All NWS Radars (In near-real time),Livestock Heat Stress Index (LSI), Wind Chill Map
Hazardous Weather Outlook For COOK County,IL

337 PM CDT Sun Jul 15 2018 /437 PM EDT Sun Jul 15 2018/

 DAY ONE  Tonight.

Weather hazards expected  

  Limited Thunderstorm Risk.


An isolated thunderstorm or two is possible through the evening.
Severe storms are not expected.

 DAYS TWO THROUGH SEVEN  Monday through Saturday.

  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.
  Limited Lakeshore Flood Risk
  High Swim Risk
  Limited Thunderstorm Risk.
Thursday through Saturday  
  Elevated Thunderstorm Risk.


  Spotter activation will not be necessary through tonight.


  Variable storm motion 10 mph or less.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For COOK County, IL
257 PM CDT Sun Jul 15 2018

Partly cloudy. A 20 percent chance of showers late in the afternoon. Lows in the lower to middle 70s. Southeast winds 5 to 10 mph in the evening shifting to the southwest after midnight.

Partly sunny with a 30 percent chance of showers and thunderstorms. Highs in the mid to upper 80s inland
but only in the lower 80s near the lake. Northwest winds 10 to 15 mph.

Clear. Lows in the mid 60s in the suburbs
but in the upper 60s downtown. Northwest winds 5 to 10 mph.

Mostly sunny. Highs in the lower 80s inland
but only in the mid 70s near the lake. North winds 10 to 15 mph.

Clear. Lows around 60 in the suburbs
but in the mid 60s downtown. Northeast winds 10 to 15 mph.

Mostly sunny. Highs around 80 inland
but only in the mid 70s near the lake.

Mostly clear in the evening then becoming partly cloudy. Lows in the lower 60s.

Partly sunny. A 30 percent chance of showers and thunderstorms in the afternoon. Highs in the lower 80s.

Mostly cloudy with a 40 percent chance of showers and thunderstorms. Lows in the mid 60s.

Mostly cloudy with a 50 percent chance of showers and thunderstorms. Highs around 80. Lows in the mid 60s.

Mostly cloudy with a 40 percent chance of showers and thunderstorms. Highs in the upper 70s.

Mostly cloudy with chance of showers. Lows in the mid 60s. Chance of precipitation 30 percent.

Mostly cloudy with chance of showers. Highs around 80 inland
but only in the mid 70s near the lake. Chance of precipitation 40 percent.

12-48 Hr Surface, 12-48 Hr ETA 500mb/Sfc, TWC Forecast, Fire Danger, Day 1 Precip, Day 2 Precip, Days 1-5 Precip
NGM 60 Hr Forecast Meteograms : Springfield , Peoria , Quad City , Chicago (O'Hare) , Rockford , Severe Weather Pot.-Day 1, Day 2

Medium & Long Range Outlook For Illinois
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   JUL 21-25    JUL 23-29    JUL       JUL-SEP                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below      Above      Above                      
 Precipitation:     Normal        Above     Normal     Normal                      

....  Medium and long range outlooks provided by NCEP/K. Thomas Priddy
5 Day Rainfall Forecast, 6 to 10 Day , 8 to 14 Day , Text, 30-Day Outook, 90-Day Outook, 120-Day Outlook
MRF 10-Day Forecast Meteograms : Springfield , Peoria , Quad City , Chicago (O'Hare) , Rockford

Almanac Information

Sunday July 15, 2018 the 196th Day of Year

Declination 21.360000
Distance 0.999715 AU
Rise 06:44 EDT Set 21:26 EDT
Transit Meridian 14:05 EDT
Civil Twilight Begins 06:13 EDT Ends 21:56 EDT

Calculations made for central point in the state.
Time in ET -- and will vary due to location and
elevation -- Priddy

Historical Weather And Climate Facts For Today

A dying South Atlantic Coast storm produced torrential rains in the
southern Appalachian Mountains. Altapass NC was drenched with more than 22
inches of rain, a 24 hour rainfall record for the state. Flooding resulted
in considerable damage, particularly to railroads. (David Ludlum)
The temperature at Balcony Falls VA soared to 110 degrees to establish a
state record. (The Weather Channel)
The Big Thompson Creek in Colorado flooded for the second time in seven
years, claiming three lives, and filling the town of Estes Park with eight
to ten feet of water. (The Weather Channel)
Unseasonably cool weather spread into the south central and eastern U.S.
Fifteen cities reported record low temperatures for the date, including
Houghton Lake MI with a reading of 37 degrees. The high temperature for the
date of 58 degrees at Flint MI was their coolest of record for July.
Thunderstorms spawned several tornadoes in Illinois and Indiana, injuring a
cow near Donovan IL. (The National Weather Summary) (Storm Data)
Twenty-six cities east of the Mississippi River reported record high
temperatures for the date. Charleston WV established an all-time record
high with a reading of 103 degrees, and Chicago IL reported a record fifth
day of 100 degree heat for the year. A severe thunderstorm moving across
Omaha NE and the Council Bluffs area of west central Iowa spawned three
tornadoes which injured 88 persons, and also produced high winds which
injured 18 others. Winds at the Omaha Eppley Airport reached 92 mph. Damage
from the storm was estimated at 43 million dollars. (Storm Data) (The
National Weather Summary)
Thunderstorms drenched Kansas City MO with 4.16 inches of rain, a record
for the date. Two and a half inches of rain deluged the city between Noon
and 1 PM. Afternoon thunderstorms in South Carolina deluged Williamstown
with six inches of rain in ninety minutes, including four inches in little
more than half an hour. (The National Weather Summary)(Storm Data)

Ag Weather Center, Department of Biosystems & Agricultural Engineering, University of Kentucky