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Cook County, IL Weather and Climate Synopsis

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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
705 PM CDT Tue Mar 20 2018

Partly to mostly cloudy skies, and cool temperatures prevailed
over central and southeast Illinois on Tuesday. Light snow
affected far eastern Illinois, by the early evening hours. High
temperatures were several degrees below normal, only reaching the
lower 40s, on the first day of astronomical spring.

A storm system strengthening over the eastern U.S., will spread
accumulating snow as far west Indiana and Kentucky, for tonight
and into early Wednesday. Farther west, high pressure will bring 
cool and dry weather to much of the Midwest. A fast moving upper 
level disturbance, will bring a chance for rain showers to much of
the area, on Thursday.

Low temperatures tonight will drop into the mid 20s to mid 30s
across the Midwest. Highs on Wednesday will range from the upper
30s in northwest Indiana, to the lower 50s in central Missouri.

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 200 AM CDT WED MAR 21 2018

CHICAGO-OHARE  CLOUDY    33  20  58 NE10      29.92R WCI  25          
CHICAGO-MIDWAY CLOUDY    33  19  56 NE15G23   29.92R WCI  23          
AURORA         FAIR      27  21  78 N12       29.94R WCI  17          
LANSING*       FAIR      30  22  72 NE15      29.91S WCI  19          
JOLIET*        FAIR      31  25  78 N9        29.93R WCI  23          
WAUKEGAN       CLOUDY    32  21  64 NE9       29.93S WCI  24          
DUPAGE AIRPORT CLOUDY    28  23  81 N12       29.92S WCI  18          
KANKAKEE*      FAIR      29  24  81 N7        29.90S WCI  22          
WHEELING       MOCLDY    34  20  56 NE10G18   29.95R WCI  26          
MORRIS*        MOCLDY    29  22  76 N8G16     29.93R WCI  21          
ROMEOVILLE*    FAIR      30  25  81 N13       29.92S WCI  20          
NORTHERLY ISL    N/A     32  21  64 NE22        N/A  WCI  19          

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 200am CDT, Wednesday March 21, 2018

Across Illinois...temperatures are near 33 degrees north. Current sky condition is cloudy north. In the north, relative humidity is near 58%, and the dew point is near 20 degrees. Winds are from the northeast at 10 mph north, where conditions are favorable for spraying. The wind chill is near 25 degrees north. Winds are unavailable central. Winds are unavailable south. Based on current available observations, the highest temperature is 33 degrees at Rockford and O'Hare Airport. The lowest temperature is 32 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

347 PM CDT Tue Mar 20 2018 /447 PM EDT Tue Mar 20 2018/

 DAY ONE  Tonight.

Flooding is expected along portions of the Kankakee River.

 DAYS TWO THROUGH SEVEN  Wednesday through Monday.

Flooding is expected along portions of the Kankakee River.


Spotter activation will not be necessary through tonight.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For COOK County, IL
334 PM CDT Tue Mar 20 2018

Mostly cloudy. Lows in the upper 20s. North winds 10 to 20 mph. Gusts up to 30 mph in the evening.

Partly sunny. Highs in the upper 30s. North winds 10 to 15 mph.

Clear. Lows in the mid 20s. North winds 5 to 10 mph.

Mostly sunny in the morning then becoming partly cloudy. Highs in the upper 40s. Northwest winds 5 to 10 mph.

Partly cloudy in the evening then clearing. Lows in the upper 20s. Northeast winds 5 to 10 mph.

Mostly sunny in the morning then becoming partly cloudy. Highs in the lower 40s.

Mostly cloudy. A 40 percent chance of snow after midnight. Lows around 30.

Mostly cloudy. Snow likely and a chance of rain in the morning, then rain likely in the afternoon. Highs in the upper 30s. Chance of precipitation 60 percent.

Partly cloudy. A 30 percent chance of rain and snow in the evening. Lows in the upper 20s.

Partly cloudy. Highs in the mid 40s. Lows in the lower 30s.

Mostly cloudy. Chance of rain in the evening, then a chance of rain and snow after midnight. Lows in the mid 30s. Chance of precipitation 40 percent.

Mostly cloudy with a 50 percent chance of rain. Highs around 50.

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 
                   MAR 26-30 MAR 28-APR 3    MAR       MAR-MAY                      
                 -----------  -----------  --------  ---------
   Temperature:      Above        Below      Below     Normal                      
 Precipitation:      Above        Below     Normal      Above                      

....  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

Wednesday March 21, 2018 the 80th Day of Year

Declination 0.630000
Distance 0.999721 AU
Rise 07:00 EDT Set 19:13 EDT
Transit Meridian 13:05 EDT
Civil Twilight Begins 06:34 EDT Ends 19:39 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 tornado swarm occurred in the Deep South. Between late afternoon and
early the next morning severe thunderstorms spawned 31 tornadoes in
Alabama, Mississippi, Georgia and Tennessee. The tornadoes killed 334
persons and injured 1784 others. Northern Alabama was hardest hit.
Tornadoes in Alabama killed 286 persons and caused five million dollars
damage. (David Ludlum)
Severe thunderstorms spawned thirty-one tornadoes across Arkansas,
Tennessee, Missouri, Mississippi, Alabama and Kentucky. The tornadoes
killed 343 persons and caused 15 million dollars damage. Arkansas and
Tennessee each reported thirteen tornadoes. The towns of Judsonia AR and
Henderson TN were nearly wiped off the map in what proved to be the worst
tornado outbreak of record for Arkansas. A tornado, one and a half miles
wide at times, left a church the only undamaged building at Judsonia.
(David Ludlum) (The Weather Channel)

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