Lake Petersburg, IL Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Lake Petersburg, IL

June 15, 2024 12:18 AM CDT (05:18 UTC) Change Location
Sunrise 5:28 AM   Sunset 8:30 PM
Moonrise 2:24 PM   Moonset 1:40 AM 
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7 Day Forecast for Marine Location Near Lake Petersburg, IL
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Area Discussion for - Central Illinois, IL
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Area Forecast Discussion...Updated Aviation National Weather Service Lincoln IL 1132 PM CDT Fri Jun 14 2024


- Seasonably hot and humid weather is on tap for next week. Heat index values will peak at or above 100 degrees from Sunday afternoon through Monday afternoon before readings settle back into the middle to upper 90s for the remainder of the week.

Issued at 818 PM CDT Fri Jun 14 2024

A few mid-level clouds, tied to shortwave energy lifting atop the ridge axis, shouldn't be enough to interrupt an otherwise stellar diurnal cooling setup. Our 00z sounding is impressively dry, and there's no reason to think overnight temperatures won't crash into the upper 50s in many areas. In a similar manner, the diurnal bounce Saturday afternoon could be equally impressive as temperatures surge back into the upper 80s beneath a thin layer of high clouds.


(Tonight through Saturday)
Issued at 309 PM CDT Fri Jun 14 2024

Weak cold front has settled southward into the Ohio River Valley this afternoon, allowing a slightly cooler and less humid airmass to filter into central Illinois. 19z/2pm dewpoints have dropped into the 50s everywhere along/north of I-70...making things feel quite a bit more comfortable than yesterday. As high pressure builds into the region tonight, radiational cooling of the drier air will allow low temperatures to fall into the upper 50s and lower 60s. The high will shift off to the east on Saturday: however, boundary layer flow will maintain an easterly component and dewpoints will stay in the 50s. High temperatures will reach the middle to upper 80s.


(Sunday through Next Friday)
Issued at 309 PM CDT Fri Jun 14 2024

A short-wave trough will track from Colorado/New Mexico northeastward into the western Great Lakes on Sunday. This feature will remain just W/NW of central Illinois, with scattered showers/storms perhaps getting as close as the Mississippi River Saturday night into Sunday. Have maintained a dry forecast at this time, but may need to add slight chance PoPs across the Illinois River Valley if the trailing trough axis gets closer than currently expected. As the wave lifts into the Great Lakes, a warm front will get pulled northward through central Illinois, causing winds to veer to the SW by Sunday afternoon. This will push air temperatures into the lower to middle 90s and dewpoints well into the 60s. Resulting heat index values will reach the upper 90s to around 100 degrees. Even higher heat index readings of 100-105 are expected on Monday as upper heights rise and air temperatures reach the middle 90s.

As deep-layer southwesterly flow develops, a swath of moisture will flow northward from the western Gulf of Mexico. Both the GFS and ECMWF suggest widely scattered diurnal convection both Monday and Tuesday afternoons. As diurnal cloud cover increases, air temperatures will likely be a couple degrees cooler by Tuesday, resulting in heat index values generally below 100. After that, a hot and humid week is ahead with temperatures in the 90s through next Friday.


(For the 06z TAFs through 06z Saturday Night)
Issued at 1115 PM CDT Fri Jun 14 2024

VFR conditions to prevail the next 24 hours with mainly scattered high clouds, though a few diurnal clouds around 5,000 feet may form toward midday Saturday. Winds will shift to the south- southeast Saturday morning and increase to around 8-10 knots.
Evening model guidance is hinting at some potential LLWS developing over the northwest half of Illinois Saturday evening, which may be an issue for KPIA by the end of the forecast period.



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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KSPI ABRAHAM LINCOLN CAPITAL,IL 17 sm26 mincalm10 smClear68°F61°F78%30.03
KIJX JACKSONVILLE MUNI,IL 23 sm23 minNNW 0310 smClear68°F61°F78%30.03
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Central Illinois, IL,

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