EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1256 AM EDT WED JUL 09 2014 VALID 12Z SAT JUL 12 2014 - 12Z WED JUL 16 2014 ...HEAT WAVE FOR MUCH OF THE INTERIOR NORTHWEST... THE MUCH ADVERTISED MIDSUMMER AMPLIFICATION OF THE FLOW OVER NORTH AMERICA APPEARS TO BE A LOCK AT THE MEDIUM RANGE, WITH ALL THE GLOBAL NUMERICAL GUIDANCE DEPICTING THE HIGH-MERIDIONAL EVENT. THE EUROPEAN CENTRE ENSEMBLE MEAN WAS FIRST TO HOME IN ON THE INTENSITY OF THE BUCKLING, AND HAS BEEN STABLE ENOUGH OVER THE LAST THREE DATA CYCLES TO SERVE AS BEST-FIT, SYNOPTIC-SCALE TEMPLATE. A FULL-LATITUDE RIDGE IS SLATED FOR WESTERN NORTH AMERICA THIS PERIOD. THE SENSIBLE WEATHER HAZARDS ASSOCIATED WITH THE RIDGE ARE TWOFOLD. FIRST, SEARING HEAT SHOULD BLOOM OVER THE INTERIOR NORTHWEST, WITH HIGH TEMPERATURES AT OR ABOVE 100 IN THE LOWLANDS BETWEEN THE CASCADES AND THE ROCKIES. SECOND, THE SOUTHWEST MONSOON MAY REALLY DOUSE THE DESERTS OF SOUTHERN CALIFORNIA AND THE LOWER COLORADO VALLEY MID PERIOD. ON THE FLIPSIDE, A FULL-BLOWN POLAR VORTEX IS PROGGED TO WHIRL INTO PLACE ACROSS ONTARIO AND QUEBEC DAYS 5 THROUGH 7. MASS FIELD STANDARDIZED ANOMALIES NEAR THE CENTER OF THE VORTEX ARE PROGGED TO BE ON THE ORDER OF -2.0 TO -3.5. THE COOLEST CONDITIONS AT THE SURFACE SHOULD BE OVER THE UPPER MIDWEST AND WHERE RAINFALL ON THE NORTH SIDE OF THE POLAR FRONT REALIZES THE WET-BULB VALUES. THERE IS LIKELY TO BE A STRIPE ABOUT A STATE-WIDE SOMEWHERE FROM COLORADO TO SOUTHERN MISSOURI WHERE TEMPERATURES COULD WELL HOVER IN THE MID 60S MUCH OF DAY 7. CISCO