The National Weather Service has issued a frost advisory for all of northern Indiana, with overnight lows set to plummet.
According to the alert, Lake, Porter, LaPorte, Newton and Jasper counties will be under the frost advisory from 3 a.m. to 8 a.m. Thursday.
Low temperatures in the area may not quite hit the freezing mark, but are expected to drop into the low-to-mid 30s, which could harm or even kill vulnerable vegetation, according to the alert.
Residents are advised to cover vulnerable vegetation overnight if they’re planning to leave those plants outside.
Areas closer to Lake Michigan will likely remain warm enough to avoid frost formation, according to NWS.
According to the University of Illinois, frost can occur even when the air temperature is above freezing, because warm air rises quickly from the ground, causing water vapor in the air near the surface to freeze, creating frost.
A freeze occurs when the air temperature is below 32 degrees.
Overnight lows in Illinois are expected to remain above freezing, though some far outlying areas northwest and west of the city of Chicago could see readings drop into the upper-30s. Elsewhere, readings are expected to drop into the low-to-mid 40s, with warmer temperatures closer to Lake Michigan.
Highs Thursday should rebound into the low-to-mid 60s across the area, with a weak disturbance approaching the area and potentially bringing isolated showers to the region on Friday.
from NBC Chicago https://ift.tt/IEvArCS
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