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Lasalle County, IL Weather and Climate Synopsis

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Weather Summary For Central And Southeast Illinois
National Weather Service Lincoln IL
1055 AM CST Sun Feb 18 2018

Clouds have shifted back over the northern half of Illinois late
morning, providing partly cloudy skies. Sunshine continued to
reign in the southern half of the state. Temperatures late morning
were climbing through the 30s.

Dry weather will continue this afternoon, before another storm 
system pushes into the region from the southwest tonight. This 
slow moving system will bring heavy, widespread rain to the 
Midwest through Tuesday. Temperatures however, will be very warm, 
for this time of year, with many locations reaching the 60s and 
70s for Monday and Tuesday.

Highs today will range from the lower 40s in northeast Illinois, 
to the lower 60s in central Illinois. Lows overnight will be very
mild, with forecasts ranging from the mid 30s to mid 50s across 
the Midwest, from north to south respectively.

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

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Regional Hourly Observations For LASALLE County
Issued at 1200 PM CST SUN FEB 18 2018

NORTHEAST ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
CHICAGO-OHARE  PTSUNNY   30  24  78 S15       30.21F WCI  19          
6HR MIN TEMP:  12; 6HR MAX TEMP:  30;                                

CHICAGO-MIDWAY PTSUNNY   31  25  78 S15G22    30.23F WCI  20          
6HR MIN TEMP:  20; 6HR MAX TEMP:  31;                                

AURORA         FAIR      28  24  85 SE14      30.21F FOG     WCI  17  
6HR MIN TEMP:  16; 6HR MAX TEMP:  28;                                

LANSING*       FAIR      29  28  94 S14       30.26F WCI  18          
JOLIET*        FAIR      32  28  85 S10       30.24F WCI  24          
WAUKEGAN       FAIR      33  24  69 S18       30.19F WCI  22          
6HR MIN TEMP:  16; 6HR MAX TEMP:  34;                                

DUPAGE AIRPORT FAIR      28  26  92 S12       30.21F FOG     WCI  18  
6HR MIN TEMP:  13; 6HR MAX TEMP:  28; 6HR PCP: TRACE;                

KANKAKEE*      FAIR      33  28  80 S12       30.26F WCI  25          
WHEELING       FAIR      32  26  78 S14       30.23F WCI  22          
6HR MIN TEMP:  15; 6HR MAX TEMP:  32;                                

MORRIS*        PTSUNNY   29  28  96 S13       30.22F WCI  19          
ROMEOVILLE*    FAIR      29  26  89 S14       30.23F WCI  18          
NORTHERLY ISL    N/A     31  24  76 S13         N/A  WCI  21          

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 CST, Sunday February 18, 2018

Across Illinois...temperatures are near 28 degrees north and near 46 degrees central. Current sky conditions are cloudy north and fair central. In the north, relative humidity is near 86%, and the dew point is near 25 degrees. In the central part of the state, relative humidity is near 62%, and the dew point is near 34 degrees. There is patchy fog north. Winds are from the south at 21 mph north, where conditions are not favorable for spraying due to strong winds. The wind chill is near 15 degrees north. Winds are from the south at 21 mph with gusts at 26 mph central, where conditions are not favorable for spraying due to strong winds. Winds are unavailable south. The livestock cold stress index is in the no stress category north, no stress category central, and unavailable category south. Based on current available observations, the highest temperature is 46 degrees at Springfield, Decatur, and Alton. The lowest temperature is 28 degrees at Rockford.


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 LASALLE County,IL

530 AM CST Sun Feb 18 2018 /630 AM EST Sun Feb 18 2018/

 DAY ONE  Today and Tonight.

WEATHER HAZARDS EXPECTED:
  Limited Thunderstorm Risk late tonight south of I-80.
  Significant Fog Risk this morning.

DISCUSSION:

Dense fog is in place across portions of northern Illinois this
morning. Fog will reduce visibility to a quarter mile or less and
may result in icy conditions in some locations.

 DAYS TWO THROUGH SEVEN  Monday through Saturday.

Monday  
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
  Limited Non Thunderstorm Wind Risk.
Tuesday  
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
  Limited Non Thunderstorm Wind Risk.
  Elevated Ice Accumulation Risk late.
  Limited Snow and Sleet Risk late.

DISCUSSION:

Heavy rainfall is expected across the region Monday through
Tuesday. Several inches of rain may fall in some locations. The
combination of heavy rain, snowmelt, and frozen grounds will
result in rapid runoff and rises on area streams and rivers.

 SPOTTER INFORMATION STATEMENT  

Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

Moving northeast at 50-60 MPH  

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For LASALLE County, IL
1007 AM CST Sun Feb 18 2018

REST OF TODAY
Mostly cloudy. Highs in the lower 40s. South winds 10 to 20 mph. Gusts up to 30 mph in the afternoon.

TONIGHT
Partly cloudy in the evening, then cloudy with light rain showers likely and a slight chance of thunderstorms after midnight. Lows in the upper 30s. Then temperatures becoming steady or slowly rising. South winds 10 to 20 mph. Gusts up to 30 mph in the evening. Chance of precipitation 60 percent.

WASHINGTONS BIRTHDAY
Showers and a slight chance of thunderstorms. Highs in the upper 50s. South winds 10 to 20 mph. Gusts up to 35 mph in the afternoon. Chance of precipitation 90 percent.

MONDAY NIGHT
Showers and a chance of thunderstorms. Lows in the lower 50s. Then temperatures becoming steady or slowly rising. South winds 10 to 20 mph with gusts up to 30 mph. Chance of precipitation 90 percent.

TUESDAY
Showers and a chance of thunderstorms. Highs around 60. Southwest winds 10 to 20 mph with gusts up to 30 mph. Chance of precipitation 90 percent.

TUESDAY NIGHT
Cloudy. Light rain likely in the evening, then a chance of light freezing rain, light snow and light sleet after midnight. Lows in the mid 20s. Chance of precipitation 70 percent.

WEDNESDAY
Mostly cloudy. Highs in the mid 30s.

WEDNESDAY NIGHT
Mostly cloudy with a 30 percent chance of snow. Lows in the lower 20s.

THURSDAY AND THURSDAY NIGHT
Partly cloudy. Highs around 40. Lows in the mid 20s.

FRIDAY
Mostly cloudy. Rain and snow likely in the morning, then rain likely in the afternoon. Highs in the mid 40s. Chance of precipitation 60 percent.

FRIDAY NIGHT
Mostly cloudy. Rain likely in the evening, then snow and rain likely after midnight. Lows in the lower 30s. Chance of precipitation 60 percent.

SATURDAY
Mostly cloudy. Chance of rain in the morning. Highs in the mid 40s. Chance of precipitation 30 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
                             ILLINOIS                                                                     
                 ---------------------------------------------
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   FEB 23-27 FEB 25-MAR 3    FEB       FEB-APR                      
                 -----------  -----------  --------  ---------
   Temperature:      Above        Above     Normal      Below                      
 Precipitation:      Above        Above      Above      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

Sunday February 18, 2018 the 49th Day of Year

---------------------------------------------------
SUN
Declination -11.270000
Distance 0.999723 AU
Rise 07:47 EST Set 18:39 EST
Transit Meridian 13:12 EST
Civil Twilight Begins 07:20 EST Ends 19:06 EST

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

FEBRUARY 18TH
HISTORIC WEATHER EVENTS
...1899...
While much of the central and eastern U.S. was recovering from the most
severe cold wave of modern history, the temperature at San Francisco soared
to 80 degrees to establish a record for month of February. (David Ludlum)
...1959...
Some of the higher elevations of California were in the midst of a five day
storm which produced 189 inches of snow, a single storm record for North
America. (13th-19th) (David Ludlum)
...1987...
A small but intense low pressure system combined with northerly upslope
winds to produce eight inches of snow in five hours at Meeteetsie WY,
located southeast of Cody. (The National Weather Summary) (Storm Data)
...1988...
Thunderstorms soaked the Central Gulf Coast Region with heavy rain. Totals
in southern Louisiana ranged up to 8.50 inches near the town of Ridge, with
6.55 inches at Plaguemine. Thunderstorms in northern Florida drenched
Apalachicola with 5.41 inches of rain in 24 hours, and produced wind gusts
to 75 mph at Mayo. (The National Weather Summary) (Storm Data)
...1989...
Low pressure off the coast of North Carolina brought freezing rain and
heavy snow to Virginia and the Carolinas. Snowfall totals in Virginia
ranged up to 18 inches at Franklin. Freezing rain reached a thickness of
two inches around Charlotte NC. (The National Weather Summary) (Storm Data)
...1990...
An intense but slow moving Pacific storm worked its way across Utah over a
two day period. The storm blanketed the valleys with 4 to 12 inches of
snow, and produced up to 42 inches of snow in the mountains. Heavy snow
also fell across northern Arizona. Williams received 22 inches of snow, and
12 inches was reported along the south rim of the Grand Canyon. (The
National Weather Summary) (Storm Data)

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