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Lasalle 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
432 AM CDT Mon Aug 21 2017

Isolated showers and thunderstorms moved through eastern Illinois
during the overnight. Otherwise muggy conditions were felt, with
temperatures early this morning only dropping into the mid and
upper 60s.

A frontal system will remain nearly stationary across the Upper 
Midwest, through the first part of the work week. As a result, 
showers and thunderstorms will persist across portions of the 
western Midwest this morning, before diving to the southeast. 
Summer like conditions will continue today, especially for 
southern portions of the Midwest. As the front passes through the 
area Tuesday, dry weather and cooler temperatures will move into 
the area, then last through the end of the work week.

High temperatures today will top out in the upper 80s to low 90s,
while lows Monday night only bottom out around 70 for central
Illinois.

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 LASALLE County
Issued at 1000 AM CDT MON AUG 21 2017

NORTHEAST ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
CHICAGO-OHARE  PTSUNNY   78  70  76 W13       30.07S HX  80           
CHICAGO-MIDWAY CLOUDY    80  71  74 W10       30.06S HX  84           
AURORA         PTSUNNY   76  73  91 W10       30.10S                  
LANSING*       CLOUDY    80  67  66 W10       30.08S HX  82           
JOLIET*        MOSUNNY   79  73  82 W12G17    30.09S HX  83           
WAUKEGAN       PTSUNNY   77  72  84 VRB6      30.06R                  
DUPAGE AIRPORT CLOUDY    73  72  96 W9        30.08S FOG              
KANKAKEE*      CLOUDY    80  71  75 W9        30.10S HX  83           
WHEELING       CLOUDY    78  72  81 W8        30.09R HX  80           
MORRIS*        PTSUNNY   77  71  83 W13G21    30.09R                  
ROMEOVILLE*    MOSUNNY   77  70  79 W14       30.09R                  
NORTHERLY ISL    N/A     77  67  71 SW12        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 1000am CDT, Monday August 21, 2017

Across Illinois...temperatures are near 76 degrees north, near 81 degrees central, and near 84 degrees south. Current sky conditions are cloudy north, cloudy central, and not available south. In the north, relative humidity is near 82%, and the dew point is near 70 degrees. In the central part of the state, relative humidity is near 79%, and the dew point is near 74 degrees. The heat index is near 86 degrees central. In the south, relative humidity is near 76%, and the dew point is near 76 degrees. The heat index is near 93 degrees south. The livestock heat stress category is no stress north, no stress central, and danger south. Winds are from the northwest at 8 mph north, where conditions are favorable for spraying. Winds are from the southwest at 9 mph central, where conditions are favorable for spraying. Winds are from the south at 6 mph south, where conditions are not favorable for spraying due to not available. Based on current available observations, the highest temperature is 86 degrees at Marion. The lowest temperature is 67 degrees at Galesburg.


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

427 AM CDT Mon Aug 21 2017 /527 AM EDT Mon Aug 21 2017/

 DAY ONE  Today and Tonight.

WEATHER HAZARDS EXPECTED:
  Significant Thunderstorm Risk...with an associated:
      Elevated Flooding Risk.
      Elevated Thunderstorm Wind Damage Risk...up to 60 MPH.
      Limited Hail Risk...up to quarter size.
      Limited Tornado Risk.

DISCUSSION:

An area of storms across Iowa early this morning will slowly
move east southeast through late morning. Some of these 
thunderstorms may impact part of the area during mid morning
through early afternoon. This is most favored south of a Dixon 
to Joliet to Valparaiso line. A few of the storms could be
severe with mainly a wind and heavy rain threat.

Thunderstorm potential increases again after dark from west to
east across the area. Some of these storms may be severe with
mainly a scattered damaging wind threat. Heavy rainfall is 
likely with any storms tonight, and it is possible some 
training occurs mainly in north central Illinois. This could 
result in flooding.

 DAYS TWO THROUGH SEVEN  Tuesday through Sunday.

Tuesday  
  Limited Thunderstorm Risk.
  High Swim Risk.
Sunday  
  Limited Thunderstorm Risk.

DISCUSSION:

Gusty northwest to north winds Tuesday afternoon and night will 
result in a heightened risk of rip current for the northwest 
Indiana shores.

 SPOTTER INFORMATION STATEMENT  

Spotters may be needed today and tonight.

GENERAL STORM MOTION OF THE DAY:

Moving to the east at 20 mph through this evening, and moving to 
the east at 35 mph overnight. 

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For LASALLE County, IL
1050 AM CDT Mon Aug 21 2017

REST OF TODAY
Mostly cloudy. Showers and thunderstorms likely late in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Southwest winds 10 to 15 mph. Chance of precipitation 60 percent.

TONIGHT
Mostly cloudy. Chance of showers and thunderstorms in the evening, then showers and thunderstorms after midnight. Some thunderstorms may produce heavy rainfall. Lows in the upper 60s. Southwest winds 10 to 15 mph. Chance of precipitation 80 percent.

TUESDAY
Cloudy with showers likely and a chance of thunderstorms in the morning, then partly cloudy with chance of showers in the afternoon. Highs in the upper 70s. Northwest winds 10 to 15 mph. Chance of precipitation 60 percent.

TUESDAY NIGHT
Clear. Lows in the mid 50s. Northwest winds 5 to 10 mph.

WEDNESDAY
Sunny. Highs in the mid 70s. Northwest winds 5 to 10 mph.

WEDNESDAY NIGHT
Mostly clear. Lows in the mid 50s.

THURSDAY
Partly cloudy. Highs in the mid 70s. Chance of precipitation 20 percent.

THURSDAY NIGHT
Mostly clear. Lows in the lower 50s.

FRIDAY THROUGH SUNDAY
Partly cloudy. Highs in the upper 70s. Lows in the mid 50s.

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 26-30 AUG 28-SEP 3    AUG       AUG-OCT                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below      Above      Above                      
 Precipitation:      Below       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

Monday August 21, 2017 the 233th Day of Year

---------------------------------------------------
SUN
Declination 11.700000
Distance 0.999717 AU
Rise 07:17 EDT Set 20:46 EDT
Transit Meridian 14:01 EDT
Civil Twilight Begins 06:50 EDT Ends 21:13 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 21ST...HISTORIC WEATHER EVENTS
...1883...
A tornado hit Rochester MN killing 31 persons and wrecking 1351 dwellings.
(David Ludlum)
...1888...
A tornado swarm occurred in Maryland and Delaware. Many waterspouts were
seen over Chesapeake Bay. (Sandra and TI Richard Sanders - 1987)
...1918...
A tornado struck Tyler MN killing 36 persons and destroying most of the
business section of the town resulting in a million dollars damage. (David
Ludlum)
...1983...
The temperature at Fayetteville NC soared to 110 degrees to establish a
state record. (The Weather Channel)
...1987...
Early morning thunderstorms produced severe weather in eastern Iowa and
west central Illinois. Thunderstorms produced wind gusts to 82 mph at
Moline IL, and tennis ball size hail at Independence IA. Rock Island IL was
drenched with 3.70 inches of rain. Total damage for the seven county area
of west central Illinois was estimated at twelve million dollars. (National
Weather Summary) (Storm Data)
...1988...
Thunderstorms spawned several tornadoes in Iowa, produced wind gusts to 63
mph in the Council Bluffs area, and drenched Sioux Center IA with up to
6.61 inches of rain. (Storm Data) (The National Weather Summary)
...1989...
Afternoon and evening thunderstorms produced severe weather from Kansas to
Minnesota and North Dakota. Thunderstorms in Minnesota produced baseball
size hail from Correll to north of Appleton. Thunderstorms in north central
Kansas produced wind gusts higher than 100 mph at Wilson Dam. Thunderstorms
around Lincoln NE produced baseball size hail and up to five inches of
rain, and Boone NE was deluged with five inches of rain in an hour and a
half. (The National Weather Summary) (Storm Data)


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