EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 945 AM EDT SAT MAR 14 2015 VALID 12Z TUE MAR 17 2015 - 12Z SAT MAR 21 2015 SPREAD IS HIGH THIS PERIOD, PARTICULARLY ACROSS THE EASTERN PACIFIC. THERE ARE MANY SHORTWAVES WENDING THROUGH THE FLOW--SOME SPLITTING INTO SOUTHERN CANADA, OTHERS SPLITTING TOWARD MEXICO. RELIED ON ENSEMBLE MEANS THIS FORECAST PACKAGE THAT PAINTED A MORE MUDDLED PICTURE OVER THE UNITED STATES--NAMELY THE ECENS AND NAEFS--WITH BROAD-BRUSHED LOWER SURFACE PRESSURES AND HIGHER POPS. THE GULF STATES LOOK WET THROUGHOUT THE MEDIUM RANGE, WITH PRECIPITATION RAMPING UP ALONG BOTH THE NORTHWESTERN AND SOUTHEASTERN COASTS LATE IN THE WEEK. STAYED AWAY FROM THE MSC CAMP AND ITS "CLEAN," AMPLIFIED DELIVERY OF CONTINENTAL POLAR AIR INTO THE EAST DAYS 6 AND 7. CISCO