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ARLINGTON HEIGHTS WEATHER
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NIGHT FORECASTS …
NOTE: Keep in mind lunar rise and set times don’t always correspond with night weather and early morning lows because on some days during the month the moon is visible in the sky predominantly during the daytime hours.
Overnight Monday to Tuesday …
No Weather Hazards expected …
Low temperature forecast was on target at 60°F.
DISCUSSION…
Very low chance for a few isolated showers Tuesday afternoon. The lower dew points mixing out through mid Tuesday afternoon will make it tough for any showers to get going though given the lack of large scale forcing. Models showing light QPF and CAMs with isolated convection are in all likelihood developing too much instability due to the high-biased Td forecast. Think best chance for an isolated shower or sprinkles, if any form, will probably be near the lake breeze convergence, but maintained a dry forecast.
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O’HARE FORECAST …
Forecast Beginning Monday Night, May 29, 2023 …
Monday Night: Partly cloudy, with a low around 61. Northeast wind around 5 mph.
Tuesday: Mostly sunny, with a high near 88. East wind 5 to 10 mph.
Tuesday Night: Partly cloudy, with a low around 66. East wind 5 to 10 mph.
Wednesday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. South southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Wednesday Night: Partly cloudy, with a low around 67. East southeast wind around 5 mph, with gusts as high as 10 mph.
Thursday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
Thursday Night: Partly cloudy, with a low around 65.
Friday: Mostly sunny, with a high near 87.
Friday Night: Partly cloudy, with a low around 63.
Saturday: Mostly sunny, with a high near 86.
Saturday Night: Partly cloudy, with a low around 62.
Sunday: Sunny, with a high near 86.
Sunday Night: Mostly clear, with a low around 63.
Monday: Sunny, with a high near 88.
O’Hare forecast archive and hourly weather observations archive are available HERE on the CARDINAL NEWS Magazine.
Arlingtoncardinal.com/moonphases
Arlingtoncardinal.com/nightsky
NIGHT SKY THIS MONTH …
Check the night sky objects for this month and past months in the playlist from the Space Telescope Science Institute YouTube channel Backyard stargazers get a monthly guide to the northern hemisphere’s skywatching events with “Tonight’s Sky” (Musical track The Far River written by Jonn Serrie, from the album And the Stars Go With You courtesy of New World Music Ltd. Musical track The Far River written by Jonn Serrie, from the album And the Stars Go With You courtesy of New World Music Ltd).
Telephoto lens, ISO 100, f/11, Shutter Speed 1/100 to 1/125 for the Moon.
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Telephoto lens, ISO 1600, f/11, Shutter Speed 2.5″ for the skyline. The skyline exposure was toned down, and brightness and contrast was adjusted in Photoshop.
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Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1222 AM CDT Tue May 30 2023
.SHORT TERM… Issued at 1240 PM CDT Mon May 29 2023
Through Tuesday night…
Only items of note:
* Very warm temperatures inland on Tuesday with highs in the upper 80s to near/around 90F, but with again low PM dew points
* Very low chance for a few isolated showers Tuesday afternoon
Warm (inland locations) and dry conditions on this Memorial Day will be followed by a quiet and seasonably cool night tonight (50s outside of Chicago) and then very warm conditions inland on Tuesday. Weak surface high pressure will remain in control at the surface, with the persistent Rex block holding aloft, though a bit weaker and gradually sliding east into the eastern Lakes, northeast CONUS and eastern Canada.
Much of the model guidance, particularly the NAM and GFS continues to be well overdone with the forecast dew point temperatures, with the RAP/HRRR, ECMWF, and Canadian global and regional guidance performing much better. The NAM and GFS are pulling in higher dew points from the east tomorrow, but are both several degrees too high vs. obs across north central and northeast Indiana and points east early this afternoon.
850 mb and 925 mb temperatures warming about 1 degree Celsius from this afternoon, dry ground feedback, plus expectation of lower dew points should enable highs in the upper 80s to near/around 90F inland, offset by RH of 20-30% from 45-50F Td. Forecast convective T is generally in the mid 80s, which is likely to be met, so envision a clumpier Cu field blossoming near the inland lake breeze convergence axis. Forecast highs on the immediate lakeshore and a few miles inland are ~70-75F on Tuesday.
The lower dew points mixing out through mid Tuesday afternoon will make it tough for any showers to get going though given the lack of large scale forcing. Models showing light QPF and CAMs with isolated convection are in all likelihood developing too much instability due to the high-biased Td forecast. Think best chance for an isolated shower or sprinkles, if any form, will probably be near the lake breeze convergence, but maintained a dry forecast.
Assuming no showers develop, Cu coverage will diminish with sunset on Tuesday evening, with a quiet and milder night featuring lows in the lows in the low-mid 60s (localized upper 50s far north) for most spots outside of Chicago and mid-upper 60s in the city.
Castro/NWS Chicago