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Complex Winter Storm Thursday – FridayKey Points

Important Forecast Changes

National Weather ServiceQuad Cities, IA/IL Situation ReportThursday, January 14, 2021 7:32 AM

Several rounds of precipitation possible through Friday night with long gaps between each round in eastern Iowa

There is potential to see less snow in far eastern Iowa, southeast Iowa and Illinois

Timing: The heaviest snow will fall during the late afternoon-6am Friday timeframe west of an line from Fairfield to Freeport

Potential Impacts: Reduced visibilities to under a half mile at times and slushy accumulation on pavement where the heavier snow occurs

First Issuance

Timing Light to moderate snow will develop late afternoon and evening across

northeast and central Iowa spreading southwest with time Heaviest snow is anticipated during the late afternoon and evening

Potential Impacts Significantly reduced visibilities and slushy roads Slick evening commute north and west of a Iowa City to Galena line

Confidence Low confidence on snow amounts and impacts

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Winter Storm Thursday – Thursday Night

National Weather ServiceQuad Cities, IA/IL Situation ReportThursday, January 14, 2021 7:34 AM

Additional Details

Impact Severity

Confidence

Elevated Significant

Low HighWinter Storm Severity Index

Supporting Imagery

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Possible Snowfall Ranges

Situation ReportThursday, January 14, 2021 8:22 AM

National Weather ServiceCity, State

National Weather ServiceQuad Cities, IA/IL Situation ReportThursday, January 14, 2021 8:22 AM

Not Official Forecast

Not Official Forecast

These graphics represent the potential for higher and lower snowfall amounts compared to our official forecast

Refer to the beginning of this Situation Report for the official forecast

Very large snowfall ranges exist with this system!

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National Weather ServiceQuad Cities, IA/IL Situation ReportThursday, January 14, 2021 7:19 AM

Preparedness:

- A Winter Storm Watch is issued when conditions are favorable for significant winter weather and/or

blizzard conditions. Time to prepare!

- A Winter Storm Warning is issued when a combination of heavy snow, blowing snow, and possibly ice

mixed with snow is expected to impact the area. Time to act!

- A Blizzard Warning is issued when the combination of strong wind, low visibility, and heavy snow will

significantly impact daily life.

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