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McHenry 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
357 PM CDT Tue Aug 22 2017

Mostly sunny skies prevailed across central Illinois, while more
clouds were seen across the southeast part of the state.
Temperatures around the area at 3 PM were in the middle 70s to
lower 80s.

Cooler, drier weather will continue filtering into the region 
this afternoon and stick around for quite a while. Forecasted 
temperatures through the week are expected to top out in the mid 
70s to near 80 for central Illinois, along with lower humidity 
values over the next few days.

Low temperatures overnight, will drop into the 50s for much of 
the region, with some 60s noted for southern Missouri and the 
Lower Ohio River Valley.

High temperatures on Wednesday, will top out in the mid 70s to low
80s across the Midwest.

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

Click here for UKAWC Point Agricultural, Lawn & Garden Forecast/Outlook in case of corrupt tables.
Regional Hourly Observations For MCHENRY County
Issued at 700 PM CDT TUE AUG 22 2017

NORTHEAST ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
CHICAGO-OHARE  PTCLDY    76  49  38 NW15      29.94R                  
6HR MIN TEMP:  76; 6HR MAX TEMP:  82;                                

CHICAGO-MIDWAY PTCLDY    76  51  41 NW15      29.94R                  
6HR MIN TEMP:  76; 6HR MAX TEMP:  81;                                

AURORA         CLEAR     70  58  65 NW9       29.97R                  
6HR MIN TEMP:  70; 6HR MAX TEMP:  77;                                

LANSING*       CLEAR     75  48  37 NW10      29.93S                  
JOLIET*        CLEAR     75  56  51 NW6       29.96R                  
WAUKEGAN       PTCLDY    71  50  47 VRB7G18   29.94R                  
6HR MIN TEMP:  71; 6HR MAX TEMP:  78;                                

DUPAGE AIRPORT CLEAR     73  52  47 NW15G22   29.95R                  
6HR MIN TEMP:  73; 6HR MAX TEMP:  79;                                

KANKAKEE*      CLEAR     73  55  53 NW12      29.96R                  
WHEELING       CLEAR     74  50  42 NW13      29.95S                  
6HR MIN TEMP:  74; 6HR MAX TEMP:  81;                                

MORRIS*        CLEAR     71  57  61 NW5       29.95S                  
ROMEOVILLE*    CLEAR     72  50  47 NW12      29.96R                  
NORTHERLY ISL    N/A     76  51  41 NW13        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 700pm CDT, Tuesday August 22, 2017

Across Illinois...temperatures are near 72 degrees north, near 76 degrees central, and near 81 degrees south. Current sky conditions are partly cloudy north, clear central, and partly cloudy south. In the north, relative humidity is near 45%, and the dew point is near 50 degrees. In the central part of the state, relative humidity is near 53%, and the dew point is near 58 degrees. In the south, relative humidity is near 69%, and the dew point is near 70 degrees. The heat index is near 84 degrees south. The livestock heat stress category is no stress north, no stress central, and no stress south. Winds are from the northwest at 12 mph north, where conditions are favorable for spraying. Winds are from the northwest at 12 mph central, where conditions are favorable for spraying. Winds are from the northwest at 9 mph south, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 81 degrees at Mount Vernon, Metropolis, and Marion. The lowest temperature is 70 degrees at Peru, Freeport, De Kalb, and Aurora.


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 MCHENRY County,IL

310 PM CDT Tue Aug 22 2017 /410 PM EDT Tue Aug 22 2017/

 DAY ONE  Tonight.

WEATHER HAZARDS EXPECTED:

  High Swim Risk.

DISCUSSION:

Northerly winds will build waves along the northwest Indiana
shore creating a high risk of rip currents tonight across the 
Lake and Porter County beaches.

 DAYS TWO THROUGH SEVEN  Wednesday through Monday.

Wednesday  
  High Swim Risk.

Thursday  
  Limited Fog Risk.

DISCUSSION:

The risk of rip currents will continue along the northwest 
Indiana beaches in Lake and Porter Counties through at least 
midday Wednesday

 SPOTTER INFORMATION STATEMENT  

Spotter activation will not be necessary through tonight.

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For MCHENRY County, IL
257 PM CDT Tue Aug 22 2017

TONIGHT
Clear. Lows in the lower 50s. Northwest winds 10 to 15 mph.

WEDNESDAY
Sunny in the morning then becoming partly cloudy. Highs in the mid 70s. Northwest winds 10 to 15 mph.

WEDNESDAY NIGHT
Mostly clear in the evening then becoming partly cloudy. Lows in the lower 50s. Northwest winds 5 to 10 mph.

THURSDAY
Partly cloudy. Highs in the lower 70s. North winds 5 to 10 mph.

THURSDAY NIGHT
Clear. Patchy fog after midnight. Lows in the upper 40s. Northeast winds around 5 mph.

FRIDAY
Mostly sunny in the morning then becoming partly cloudy. Highs in the lower 70s.

FRIDAY NIGHT
Partly cloudy. Lows in the lower 50s.

SATURDAY
Partly cloudy. Highs in the mid 70s.

SATURDAY NIGHT THROUGH MONDAY NIGHT
Partly cloudy. Lows in the upper 50s. Highs in the mid 70s.

TUESDAY
Partly cloudy. A 30 percent chance of showers and thunderstorms in the afternoon. Highs in the upper 70s.

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
                             ILLINOIS                                                                     
                 ---------------------------------------------
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                AUG 28-SEP 1 AUG 30-SEP 5    AUG       AUG-OCT                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below      Above      Above                      
 Precipitation:     Normal       Normal     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

Tuesday August 22, 2017 the 234th Day of Year

---------------------------------------------------
SUN
Declination 11.360000
Distance 0.999717 AU
Rise 07:18 EDT Set 20:44 EDT
Transit Meridian 14:01 EDT
Civil Twilight Begins 06:51 EDT Ends 21:11 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

/////////////////////////////
AUGUST 22ND...HISTORIC WEATHER EVENTS
...1816...
The growing season for corn was cut short as damaging frosts were reported
from North Carolina to interior New England. (David Ludlum)
...1923...
The temperature at Anchorage AK reached 82 degrees, a record for August for
the location which was later tied on the 2nd in 1978. (The Weather Channel)
...1987...
A cold front lowered temperatures 20 to 40 degrees across the north central
U.S., and produced severe thunderstorms in Ohio and Lower Michigan. An
early morning thunderstorm near Sydney MI produced high winds which spun a
car around 180 degrees. (The National Weather Summary) (Storm Data)
...1988...
Afternoon highs of 88 degrees at Astoria OR and 104 degrees at Medford OR
were records for the date, and the number of daily record highs across the
nation since the first of June topped the 2000 mark. (The National Weather
Summary)
...1989...
Evening thunderstorms in the central U.S. produced golf ball size hail at
May City IA, and wind gusts to 66 mph at Balltown IA. Lightning struck a
barn in Fayette County IA killing 750 hogs. Evening thunderstorms in
Montana produced wind gusts to 70 mph at Havre. (The National Weather
Summary) (Storm Data)


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