Weather Update for Monday, February 19, 2018 Unseasonably Warm and Rainy – Flood Watch issued for the Chicago area including Lake and Porter County Indiana.

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National Weather Service

Mondayfeb19
Rainfall will spread from south to north Monday. Areas along and south of I-80 should see rain before 6 AM. All of the forecast area should see moderate rain showers by Monday afternoon. Isolated thunderstorms are possible, especially in the afternoon as a warm front lifts into the region along with the associated low pressure system. Severe storms are not expected, but increased rainfall rates could lead to localized flooding especially with the snowpack.
Some of the rain amounts have been adjusted since yesterday’s forecast. However, there still is a considerable amount of melting snow on the ground which will add to the incoming rain to create flooding conditions in the entire Chicago area. Come Wednesday, we return to seasonable temperatures. Seasonable temperatures, some of thinking…oh nice….until the return of cold slaps you in the face like that aunt that doesn’t think you mom has raised you correctly as you realize it’s still winter. Well we tend to agree with your aunt, but that is another story.
Mondayfeb19Flood
A Flood Watch has been issued for much of northern Illinois and extreme northwest Indiana for Monday night through Tuesday night. Waves of rain and embedded thunderstorms are expected starting Monday and continuing at times through Tuesday night. Rain will be heavy at times. Widespread rainfall totals in excess of an inch are likely, with many areas likely to see 2 to 4 inches of rain. The combination of this heavy rainfall, melting snow, and frozen ground will likely result in significant runoff and the threat of flooding.
Washington’s Birthday
Showers and possibly a thunderstorm. Areas of fog. High near 55. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. Patchy fog before 1am. Temperature rising to around 61 by 2am. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. High near 64. South southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%.
Tuesday Night
Rain and possibly a thunderstorm. Some of the storms could produce heavy rain. Low around 33. Southwest wind 10 to 15 mph becoming north northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%.
Wednesday
A chance of rain, snow, and sleet before 10am, then a chance of snow between 10am and noon. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
Wednesday Night
Mostly cloudy, with a low around 26.
Thursday
Partly sunny, with a high near 42.
Thursday Night
A chance of snow after midnight. Mostly cloudy, with a low around 31.
Friday
A chance of rain and snow before 9am, then a chance of rain between 9am and noon. Mostly cloudy, with a high near 45.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 35.
Saturday
A slight chance of rain and snow. Mostly cloudy, with a high near 48.
Saturday Night
Rain likely. Mostly cloudy, with a low around 37.
Sunday
A chance of rain. Partly sunny, with a high near 48.

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