GLOBAL WARMING WTF–A POLAR VORTEX TO HIT THE MIDWEST IN JULY–TO DUMP TEMPERATURE IN THE 60F TO 70F DURING THE DAY AND–40F TO 50F AT NIGHT

THE HIGHLY ANOMALOUS AMPLIFICATION OF THE LARGE SCALE PATTERN IS  A VIRTUAL LOCK BY THE END OF THE PERIOD AS INDICATED BY ALL MEDIUM  RANGE GLOBAL NUMERICAL MODELS AND ENSEMBLE SYSTEMS. THIS WELL- ADVERTISED HIGH MERIDIONAL EVENT WILL FEATURE A FULL-LATITUDE  RIDGE AND SEARING HEAT OUT WEST…NOT TO BE OUTDONE BY THE RETURN  OF THE POLAR VORTEX IN THE EAST OVER QUE/ONT AND THE UPPER GREAT  LAKES. CONSIDERING THE MAGNITUDE OF THE UPPER LEVEL TROUGH WITH  500MB STANDARDIZED ANOMALIES ON THE ORDER OF -3 TO -4SD IN BOTH  THE DETERMINISTIC GLOBAL MODELS AND THEIR RESPECTIVE ENSEMBLE  MEANS…CONFIDENCE IN A PERIOD OF BELOW AVG TEMPS /DURING WHAT IS CLIMATOLOGICALLY THE HOTTEST TIME OF THE YEAR/ IS VERY HIGH FROM TUE-THU OF NEXT WEEK.

http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/07/10/poor-mans-polar-vortex-to-make-shocking-summer-return-in-eastern-u-s-next-week/