Warming up then temperatures tank, bitter cold coming

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WARMING EXTENDS TO SATURDAY

100% Sunny and Friday afternoon reached the middle and upper 40s (47° officially) – a huge jump from 5° on Tuesday morning and 11° above normal.  South winds will continue during the overnight hours under clear skies keeping the temperatures nearly steady around freezing.  The zonal flow in the upper level wind flow (west to east) carries pacific air across the nation and the warming continues for Saturday.  Winds will increase again Saturday afternoon mixing down to the surface 50° warmth with more sunshine expected.  If you’re in the take down these holiday lights early camp here is your chance – a big change is coming.

Wind_Vectors_2

South winds blow mild air in Saturday

DOUBLE ARCTIC BLAST – COLD BLAST #1

The cold is on the move but the timing and intensity is still being resolved.  Today’s computer run off the trusted Euro Model has broken the cold up into 2 chunks with a burst of snow to be laid down Tuesday night.  The cooling begins sharply Sunday afternoon with cold front #2 hitting New Year’s day.  This type of cold is rather rare (we haven’t been below 0° in almost 3 years) so the computer often struggles with it days in advance.  In fact the US GFS model does not even carry that much cold next week.  Today the details are still being worked out but we are leaning heavily on the cold solution.

Sunday will open cloudy with temperatures likely reaching the lower to middle 40s before winds shift just after noon.  When the front passes temperatures are forecast to drop steadily into the evening and continue to tank to 12° by Monday morning.  The cold surge will carry the chance of snow with it – snow showers with the front then possibly a connection to lake Michigan overnight into Monday morning.  Some local accumulation is possible making for some slick roads early Monday morning.

COLD BLAST 2

A fast-moving system is forecast to dive through central Indiana Tuesday night and bring another chance of snow with it.  While accumulation is still to be determined we believe that this system will tug in even colder air to start 2014.  New year’s day will could open with a fresh coating of snow and cold but the real chill is still coming.  Late Wednesday night into Thursday morning skies clear – winds go calm and with some snow on the ground temperatures should plunge to their lowest levels of the season and coldest since February 2011, the last time we fell below zero.  Currently we are forecasting a low of 0° Thursday morning in the city with possible colder temperatures away from the city.

Jet Stream

Euro Weather Map next week. Bitter cold tapped

The cold is short-lived and begins to back off again by late in the week – rebounding back to near 30° by Friday