Tuesday, December 22, 2020

Flood Risk Here, But Nothing Like Epic Torrent in Iceland, Of All Places

Serious damage from flooding and mudslides last week
in Iceland. 
Snow was falling lightly here and there this mild December morning in Vermont, and up to six inches might accumulate on the mountain peaks by tomorrow morning. 

Valleys will get a dusting to at most two inches.

It's just a minor system passing by as we get ready for the expected Christmas Eve and Day storm. That one is still expected to give us a bout of wind, rain and possible flooding. 

The forecast updates as of this morning have the rain coming in just a little later on Thursday afternoon than earlier indicated, and the rain will last a little longer into Christmas Day before a strong cold front shuts that off.

At least minor flooding seems a good bet with this storm, as an inch or more of rain and very warm temperatures will quickly melt the deep snow in southern Vermont. 

Strong winds are also forecast with this storm. 

Latest indications are that snowfall behind the cold front on Christmas Day won't amount to much as dry air cuts into the storm from the southwest.  The exception might be mountain peaks, which could get the remnants of lake effect snows from western New York. 

Today's update on the Christmas storm is broad brush.  I'll get into more detail in a post tomorrow morning. 

ICELAND FLOOD

The potential flooding in Vermont and elsewhere in the Northeast, while possibly dangerous, pales in comparison to a flood that struck Iceland this month. 

Yes, Iceland can have rain and flooding in the winter. The warm Gulf Stream, which keeps western Europe relatively mild in the winter, also passes by Iceland, so that island isn't all that cold in the winter. And they certainly get thaws.

Iceland is also stormy, especially in the winter. 

However, a storm last week was extreme, and caused a lot of destruction. About 500 people were evacuated from one town after landslides swept away several homes and damaged many more, the Iceland Grapevine reports

One town reported 22 inches of rain in five days, which is a record for rainfall intensity in Iceland. It's still rainy in lower elevations of Iceland this week, but the precipitation has become much less intense.

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