Thanks to Valerie Baxter of Elmhurst for sending along this shot of Elmhurst newly-emerged daffodils covered with Monday late-season snowfall.
What is an “embedded thunderstorm”?
– June Wheeler, Madison, Wis.
Webster’s New World Dictionary defines “embed” this way: “To set or fix firmly in a surrounding mass.” The precipitation that falls with major storm systems often extends across areas as large as several Midwestern states. Meteorologists refer to these as “synoptic scale” events. This kind of precipitation distribution differs from the relatively narrow bands or isolated clusters of showers and thunderstorms that usually occur in the warm season.
When In a situation in which a large precipitation area includes scattered thunderstorms, those storms are said to be “embedded” within the larger precipitation area. A forecast of rain and embedded thunderstorms suggests an extended period of rain that might occasionally include a thunderstorm.
At 8:30 PM CDT, radar indicated that accumulating snow was generally east of I-55, and was shifting off to the east. The snow should end across the immediate metro area by 11 PM. Accumulations have generally been in the 1/2 to 1 inch range, with as much as 1.6 inches reported at Marengo.
Later tonight, a total lunar eclipse will occur. Current RPM model forecasts show that skies should clear across most of the Chicago area around midnight. This is supported by latest satellite imagery, which shows skies clearing along the Mississippi river. The clearing line is shifting eastward and should pass Chicago in time for viewing the eclipse. The exception may be over northwest Indiana, where lake effect clouds may persist much of the night.
At 6 PM CDT, snow had overspread just about the entire Chicago metro area. Temps were just above freezing, with slushy accumulations on grassy areas, cars, and rooftops. Roadways, including secondary routes were still reported to be wet.
With sunset, temps are forecast to dip just below freezing and snow may accumulate 1 to 2 inches in some areas, again, mainly on grass and elevated surfaces.