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Summer on hold for now, what is driving this cool pattern?

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SUMMER ON HOLD

Tuesday afternoon in mid July but weather like this comes 5 games into the Colts regular season.  At 3 PM 68° in the city,  good for the normal on Oct 8th and 17° below normal. This is rare are - coolest afternoon since May 19th (2 months) and in record territory for a July 15th.  We just missed  the 'coolest' high temperature for this date, 70° set 27 years ago in 1987 with an official high of 71° at 4:21 PM.  There is still some time to go this afternoon to go up - July sunshine is strong.

CHECKING IN ON SUMMER 2014

July 15th is the 'midway' point of meteorological summer (the months of June/July and August).  Today marks the 30th day below normal since June 1st (67%).

Rainfall is running above normal by 1.51".  So far 7.98" of rain since June 1st which ranks as the 37th wettest all-time.

67% of the days since June 1st below normal

67% of the days since June 1st below normal

CHILLY NIGHT FOR JULY

We will not totally clear overnight - a factor in low temperature forecasting and that may prevent us from breaking the record.  It will be cool.  Outlying areas will boast the coolest of temperatures early Wednesday morning.  The forecast low in the city is 54° - near the record but not a breaker, the record for July 16th is 49° set in 1945.

Forecast Wednesday AM.  Record 49°

Forecast Wednesday AM. Record 49°

STAYS COOL WEDNESDAY

More cool weather Wednesday afternoon and along with the strength of July sunshine and a weak upper low overhead a few afternoon sprinkles or showers could develop. Cool eases later this week with a strong warm up coming by the weekend and into next week.

How Much below normal?

How Much below normal?

WHY SO COOL

A wavy jet stream - similar to our winter pattern, is the main culprit to our cool.  Summer is alive and well in all places the Pacific Northwest and warm well into western Canada and Alaska.  No official 90° day here yet, while places like Medford, Oregon has registered 18 days over 90° and 6 days over 100°.  Boise, Idaho has hit 14 straight days over 90°! The buckle in the jet stream sends warm air north and dislodge the cool that settles over the eastern U.S. for now.  Warming will be underway by the weekend with signals off long-range models of more July like and above normal temperatures coming next week.

Cool in the east with heat in the NW U.S.

Cool in the east with heat in the NW U.S.