EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 124 AM EDT TUE JUL 08 2014 VALID 12Z FRI JUL 11 2014 - 12Z TUE JUL 15 2014 ...HEAT WAVE FOR MUCH OF THE INTERIOR NORTHWEST... THE MODELS HAVE RAMPED UP THE AMPLITUDE OF THE HIGH-MERIDIONAL FLOW EVENT ACROSS NORTH AMERICA AT THE MEDIUM RANGE, WITH THE 12Z/07 EUROPEAN CENTRE ENSEMBLE MEAN THE MOST EXTREME IN ITS ANOMALIES. THE 12Z/07 OPERATIONAL GEM GLOBAL AND THE CMCE MEAN WERE ALSO IMPRESSIVELY PUMPED BY DAY 7, WITH THE GFS AND GEFS TAKING UP THE FLAT END OF THE GUIDANCE. USED FOUR-PARTS ECENS MEAN AND ONE-PART NAEFS MEAN FOR THE MANUAL BLEND, HEDGING SLIGHTLY AGAINST THE +/-2.5 TO +/-3.5 STANDARDIZED ANOMALIES THAT MARK THE EUROPEAN CENTRE'S MASS FIELDS DAYS 5 THROUGH 7. THE HIGH-AMPLITUDE REGIME WILL HAVE SEVERAL SIGNIFICANT EFFECTS ON THE SENSIBLE WEATHER. FIRST, THE INTERIOR NORTHWEST WILL SEE HIGHS CLIMB SEVERAL DEGREES IN EXCESS OF THE CENTURY MARK DAYS 4 THROUGH 6, WITH WASHINGTON, OREGON, AND IDAHO MOST ANOMALOUS. THE COOL COUNTERPART OVER THE EAST WILL COME IN TWO WAVES: THE FIRST DAYS 3 AND 4, THE SECOND DAY 7. NORMALLY, THE DEEPER INTO JULY, THE MORE TEPID COOL OUTBREAKS MANIFEST. IN THIS CASE, THE COOL AIR PROGGED TO DRIVE INTO THE NORTHERN AND CENTRAL PLAINS AND THE GREAT LAKES AT THE END OF THE PERIOD MAY WELL BE ON PAR WITH LAST WEEK'S OUTBREAK--OR EVEN ONES FROM LAST MONTH. FINALLY, SHOWERS WILL ORGANIZE OVER SPRAWLING REAL ESTATE FOR MIDSUMMER EAST OF THE ROCKIES, WITH THE SUPPRESSED POLAR FRONT FORGING ZONALLY-ORIENTED STRIPES OF RAINFALL. CISCO