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Winter Storm Warning Downgraded to a Winter Weather Advisory; 4″ Snow on Grassy Areas at 8:30 PM Saturday

Sat April 27 2019 8:37 pm  https://www.arlingtoncardinal.com/?p=576451
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The National Weather Service has replaced the Winter Storm Warning with a Winter Weather Advisory as only limited periods of heavy snow have occurred today, and only limited periods of snow are forecast for the rest of the night. Pavement is mainly snow free except for concrete driveways where about 1.5 inch has accumulated at 8:31 p.m.

Grassy areas away from trees have an accumulation of 4 inches in Arlington Heights at 8:30 p.m. The snow is wet and heavy, and this combined with wind as high as 30 MPH or higher, has caused some branches to interfere with power lines, and has caused some power lines down, tree fires, blown transformers and power outages (Arlingtoncardinal.com/ComEd).

Weather Radar (also nexrad.chgowx.com) shows light or moderate snow with occasional heavy snow. Radar indicates snow will end in Arlington Heights by 9:30 p.m. to 10:00 p.m.







 O’HARE FORECAST … 

Tonight: Snow, possibly mixing with rain after 11pm, then gradually ending. Low around 28. Blustery, with a north northeast wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 2 to 4 inches possible.

Sunday: Sunny, with a high near 48. North wind 5 to 10 mph becoming east in the afternoon. Winds could gust as high as 15 mph.

Sunday Night: Showers likely after 1am. Increasing clouds, with a low around 40. East wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Monday: Showers, mainly before 1pm. High near 56. East southeast wind 5 to 10 mph becoming north in the afternoon. Chance of precipitation is 80%.

Monday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 43. North northeast wind around 5 mph.

Tuesday: Showers likely, mainly after 1pm. Cloudy, with a high near 56. Chance of precipitation is 60%.

Tuesday Night: Showers likely. Cloudy, with a low around 47. Chance of precipitation is 70%.

Wednesday: A chance of showers. Cloudy, with a high near 63.

Wednesday Night: A chance of showers. Mostly cloudy, with a low around 48.

Thursday: A chance of showers. Mostly cloudy, with a high near 63.

Thursday Night: Mostly cloudy, with a low around 44.

Friday: Mostly sunny, with a high near 60.

Friday Night: Mostly clear, with a low around 41.

Saturday: Mostly sunny, with a high near 61.

Winter Weather Advisory
URGENT – WINTER WEATHER MESSAGE
National Weather Service Chicago IL
516 PM CDT Sat Apr 27 2019

ILZ012>014-280400-
/O.CAN.KLOT.WS.W.0006.000000T0000Z-190428T0600Z/
/O.NEW.KLOT.WW.Y.0018.190427T2216Z-190428T0400Z/
Kane-DuPage-Cook-
Including the cities of Aurora, Elgin, Wheaton, and Chicago
516 PM CDT Sat Apr 27 2019

…WINTER WEATHER ADVISORY IN EFFECT UNTIL 11 PM CDT THIS
EVENING…
…WINTER STORM WARNING IS CANCELLED…

* WHAT…Light to moderate, occasionally heavy, wet snow.
Additional snow accumulations of 1 to 3 inches. Brief periods
of ice pellets are possible. Winds gusting as high as 30 to 35
mph.

* WHERE…Kane, DuPage and Cook Counties.

* WHEN…Until 11 PM CDT this evening.

* ADDITIONAL DETAILS…Plan on reduced visibility under the
heavier snow and gusty winds. Light slushy snow accumulation and
slippery road conditions are possible, especially on side or
lesser used roads.

 LAKE MICHIGAN … 

LAKE MICHIGAN WATER LEVELS
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
855 AM CDT Sat Apr 27 2019

LAKE MICHIGAN WATER LEVEL…580.87 FEET
CHART DATUM……………..577.50 FEET
ONE MONTH AGO……………7 INCHES ABOVE
ONE YEAR AGO…………….9 INCHES ABOVE
ALL-TIME HIGH MONTHLY MEAN..7 INCHES BELOW/RECORDED 1986
ALL-TIME LOW MONTHLY MEAN…57 INCHES ABOVE/RECORDED 1964
EXPECTED LEVEL IN A MONTH…4 INCHES ABOVE

april.chicagoweatherstation.com

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Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 642 PM CDT Sat Apr 27 2019

.UPDATE… 517 PM CDT

Have replaced the Winter Storm Warning across portions of northern IL with a Winter Weather Advisory for this evening. Latest radar imagery showing light to moderate, occasionally heavy, snow still in place across northern IL. However, there aren`t really any persistent areas of heavier snow, similar to what has occurred across most areas for much of the day. This has resulted in limited impacts across the warned area, other than some isolated light slushy snow accumulations on side/lesser used roads and reduced visibility. Although periods of heavy snow will remain possible through mid to late evening, once again, it does not appear that it will be anything persistent or long lasting in anyone area. This should limit additional snow accumulation this evening, including any snow accumulation on area roadways.

Given these trends, decided to replace the warning with an advisory. Time of arrival and short term guidance showing this snow should come to an end this evening in the 9-11 PM CDT time frame, with an additional snow accumulations of 1 to 3 inches. Once again, reduced visibility under the heavier snow and gusty winds along with light slushy snow accumulation and slippery road conditions are possible, especially on side or lesser used roads.

Rodriguez

&&

.SHORT TERM… 328 PM CDT

Through tonight…

A late season winter storm is bringing multiple weather impact to the region.

For the afternoon update, will make no changes to the Winter Weather Warning as a band of convectively enhanced rain and snow continues to spread across portion of the CWA generally north of the I-80 corridor. Main adjustment to the previous forecast has been to slightly lower total snowfall amounts in deference to slightly lower liquid to snow ratios in the marginally cold air in the main deformation band expected to be associated with the bulk of the snowfall.

In general, the storm system is playing out as previously anticipated though the initial appearance of snow occurred a little earlier than anticipated, but the changeover from rain to snow has not been a smooth transition given the convective nature of the main band of pcpn across nrn IL. Latest satellite imagery also shows the very convective nature of the pcpn band, aligning well with the radar imagery. As of 3pm CDT, pcpn is mainly all snow north of the I-88 corridor with periods of mixed rain/snow between I-88 and I-80. South of I-80 temperatures have mainly been in the 40s with occasional dips in the upper 30s with some pockets of dynamic cooling. Given the convective nature of the pcpn, still expect periods with snowfall rates of 1-2″ per hour reducing visibility to near zero for short period. Since temperatures have been at or above seasonal normal levels over recent days, pavement temperatures will likely remain high enough that most of the accumulation will occur on grassy or elevated surfaces, with roads likely seeing either a slushy accumulation or, perhaps, no accumulation at all.

Other impacts of the system will come front strong, gusty winds in a strong pressure gradient that will remain in place north of the sfc low track. Latest guidance continues to indicate that the main sfc low will track across central IL/IN with strong ely-esely winds across the CWA. Strongest winds, with gusts up to 35 mph will be along the lake front, with inland winds gusting to 25-30 mph. As the sfc low tracks through cntrl IL this evening and into cntrl IN later tonight, winds will gradually shift to northerly and then diminish late tonight.

As the sfc low passes off to the east, high pressure will build across the Middle/Upper Mississippi Valley, bringing clearing skies along with the diminishing winds. There is a chance that winds will drop off to light and variable over the nwrn portions of the CWA. Any lingering snow cover, combined with the light wind and cooler, drier air mass associated with the sfc high, could allow for temperatures to drop to the lower 20s, especially for locations near the I-39 corridor. Some guidance has even suggested that temps could drop into the upper teens, but have not gone quite that low. Also, this area could see some shallow ground fog develop since the ground will be saturated from the pcpn. The remainder of the CWA should see lows tonight in the lower to middle 30s.

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