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Williamson County, IL Weather and Climate Synopsis

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

US Weekly Rainfall Departure

US Weekly Temperature Departure
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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
934 AM CDT Tue Jul 17 2018

Mostly sunny skies and seasonable temperatures prevailed over
central and southeast Illinois this morning. Overnight lows ranged
from 59 in Galesburg, to 73 in Flora.

A large high pressure ridge centered over the upper Midwest, will
shift east into the Great Lakes, through mid-week. This will 
bring seasonable temperatures and dry weather to the region. The 
next chance for rainfall will occur on Thursday, when a frontal 
boundary approaches from the west.

High temperatures today will reach the 80s for much of the
Midwest, while lows tonight will drop into the 60s.

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 WILLIAMSON County
Issued at 1200 PM CDT TUE JUL 17 2018

CARBONDALE     PTSUNNY   86  73  66 N5        30.03F HX  93           
CAIRO*         FAIR      86  75  69 NW3       30.02F HX  96           
EFFINGHAM*     FAIR      83  61  47 NE6       30.08S HX  84           
MARION         PTSUNNY   88  73  62 NW6       30.04S HX  96           
MT. VERNON     FAIR      86  73  65 VRB5      30.04F HX  93           
CENTRALIA*     PTSUNNY   84  75  75 NE3       30.04S HX  92           
SALEM*         FAIR      84  67  56 NE7       30.06S HX  87           
METROPOLIS*    FAIR      88  75  67 N5        30.03S HX  97           

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 1200pm CDT, Tuesday July 17, 2018

Across Illinois...temperatures are near 80 degrees north and near 88 degrees south. Current sky conditions are partly sunny north and partly sunny south. In the north, relative humidity is near 46%, and the dew point is near 58 degrees. The heat index is near 80 degrees north. In the south, relative humidity is near 62%, and the dew point is near 73 degrees. The heat index is near 96 degrees south. The livestock heat stress category is no stress north, unavailable central, and danger south. Winds are from the northeast at 13 mph north, where conditions are not favorable for spraying due to strong winds. Winds are unavailable central. Winds are from the northwest at 6 mph south, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 88 degrees at Mount Vernon and Marion. The lowest temperature is 20/ 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 WILLIAMSON County,IL

329 AM CDT Tue Jul 17 2018

 DAY ONE  Today and Tonight

Afternoon heat index values may top out around 100 degrees over
southeast Missouri, the Purchase Area of Kentucky, and adjacent
portions of southern Illinois.

 DAYS TWO THROUGH SEVEN  Wednesday through Monday

An isolated thunderstorm will be possible over Carter and Ripley
Counties in Missouri Wednesday afternoon, and throughout southeast
Missouri late Wednesday night and Thursday morning. Locally heavy
rainfall and lightning will be the primary concerns.

Isolated to scattered thunderstorms will be possible throughout 
the region late Thursday night. Locally heavy rainfall and 
lightning will be the primary concerns.

A good chance of thunderstorms is forecast throughout the region 
Friday and Friday night. Lesser chances of thunderstorms will 
linger over eastern portions of the area Saturday. A few severe
storms will be possible Friday afternoon and evening. Otherwise, 
locally heavy rainfall and lightning will be the primary concerns
through the period.

Afternoon heat index values may reach 105 over parts of southeast
Missouri and southern Illinois Friday.


Spotter activation cannot be ruled out Friday afternoon and

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For WILLIAMSON County, IL
528 AM CDT Tue Jul 17 2018

Partly sunny. Patchy fog in the morning. Highs in the upper 80s. North winds around 5 mph.

Mostly clear. Lows in the mid 60s. Northeast winds around 5 mph.

Mostly sunny. Highs in the mid 80s. Northeast winds around 5 mph.

Mostly clear. Lows in the mid 60s. East winds 5 mph.

Partly sunny. Highs in the upper 80s. Southeast winds 5 to 10 mph.

Partly cloudy. A 20 percent chance of showers and thunderstorms after midnight. Lows in the lower 70s.

Partly sunny with a 50 percent chance of showers and thunderstorms. Highs in the upper 80s.

Partly cloudy. A 50 percent chance of showers and thunderstorms in the evening. Lows around 70.

Mostly sunny. Highs in the mid 80s.

Mostly clear. Lows in the upper 60s.

Mostly sunny. Highs in the mid 80s.

Mostly clear. Lows in the upper 60s.

Mostly sunny. Highs in the upper 80s.

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 22-26    JUL 24-30    JUL       JUL-SEP                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below      Above      Above                      
 Precipitation:      Below        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

Tuesday July 17, 2018 the 198th Day of Year

Declination 21.020000
Distance 0.999716 AU
Rise 06:45 EDT Set 21:25 EDT
Transit Meridian 14:05 EDT
Civil Twilight Begins 06:15 EDT Ends 21:55 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

One of the worst heat waves in the history of the nation commenced. During
the last two weeks of the month extreme heat claimed 679 lives in Michigan,
including 300 in Detroit alone. (The Weather Channel)
A prolonged heat wave over Washington State finally came to an end.
Lightning from untimely thunderstorms was responsible for 598 forest fires.
(David Ludlum)
Thunderstorms helped the temperatur at Key West FL to dip to 69 degrees, to
equal their July record established on the first of July in 1923. (The
Weather Channel)
On a warm and sunny day at Wilmington DE, with a high of 86 degrees, a dust
devil suddenly appeared. It tore most the roof off one house, and stripped
shingles from a neighboring house. A TV aerial was toppled, and clothes
were blown off clothes lines. (The Weather Channel)
Slow moving thunderstorms caused flooding on the Guadalupe River in Texas
resulting in tragic loss of life. A bus and van leaving a summer youth camp
stalled near the rapidly rising river, just west of the town of Comfort,
and a powerful surge of water swept away 43 persons, mostly teenagers. Ten
drowned in the floodwaters. Most of the others were rescued from tree tops
by helicopter. (The National Weather Summary) (Storm Data)
A dozen cities in the eastern U.S., and six others in California, reported
record high temperatures for the date. Downtown San Francisco CA, with a
high of 103 degrees, obliterated their previous record high of 82 degrees.
Philadelphia PA reported a record five straight days of 100 degree heat,
and Baltimore MD reported a record eight days of 100 degree weather for the
year. Afternoon and evening thunderstorms produced severe weather along the
Middle Atlantic Coast, and over southern New England. (The National Weather
Thunderstorms produced severe weather from South Dakota to Lousiana, with
126 reports of large hail and damaging winds during the day and night.
Thunderstorms in Nebraska produced hail four inches in diameter in Frontier
County, and at North Platte, causing millions of dollars damage to crops in
Frontier County. Thunderstorms in Oklahoma produced wind gusts to 90 mph at
Peggs. Tahlequah OK was drenched with 5.25 inches of rain. (Storm Data)
(The National Weather Summary)

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