PROGNOSTIC DISCUSSIONS FOR 6 TO 10 AND 8 TO 14 DAY OUTLOOKS NWS CLIMATE PREDICTION CENTER CAMP SPRINGS MD 300 PM EDT TUE MAR 13 2007 6-10 DAY OUTLOOK VALID FOR MAR 19 - 23 2007 TODAYS AVAILABLE ENSEMBLE MEAN SOLUTIONS ARE IN FAIRLY GOOD AGREEMENT ON THE EXPECTED 500-HPA CIRCULATION PATTERN FOR THE 6-10 DAY PERIOD. TROUGHS ARE FORECAST NORTHEAST OF HUDSON BAY AND OVER EASTERN ALASKA WHILE A FLAT RIDGE IS EXPECTED OVER THE SOUTH/CENTRAL CONUS. A WEAK TROUGH IS FORECAST OVER THE SOUTHWESTERN PART OF THE NATION. THE NORTHERN TIER OF THE CONUS IS FORECAST TO BE DOMINATED BY FAST ZONAL FLOW. THE GFS-BASED ENSEMBLE MEANS ARE THE MOST PROGRESSIVE WITH THE CIRCULATION FEATURES WHILE THE CANADIAN ENSEMBLE IS THE LEAST AMPLIFIED WITH THE EXPECTED FLOW PATTERN. THE OPERATIONAL 0Z AND 6Z GFS AND OPERATIONAL ECMWF ARE SIMILAR TO THEIR ENSEMBLE MEAN SOLUTIONS... ALTHOUGH THERE ARE SOME TIMING AND AMPLITUDE DIFFERENCES WITH REGARD TO INDIVDUAL SHORTWAVE FEATURES. HEIGHTS ACROSS THE CONUS ARE GENERALLY EXPECTED TO BE NEAR OR ABOVE NORMAL. HEIGHTS OVER MOST OF CANADA AND ALASKA ARE FORECAST TO BE BELOW NORMAL ALTHOUGH NEAR TO ABOVE NORMAL HEIGHTS ARE PROGGED OVER MOST OF SOUTHERN CANADA. THE MODELS GENERALLY SHOW GOOD CONTINUITY WITH RESPECT TO THEIR SOLUTIONS FROM YESTERDAY. THE PNA INDEX WHICH RECENTLY HAS BEEN WEAKLY POSITIVE IS EXPECTED TO REMAIN NEAR ZERO FOR THE NEXT TWO WEEKS. THE NAO INDEX WHICH RECENTLY HAS BEEN POSITIVE IS EXPECTED TO REMAIN POSITIVE FOR THE NEXT TWO WEEKS. NORTHWESTERLY FLOW AROUND THE HUDSON BAY TROUGH SHOULD LEAD TO BELOW NORMAL TEMPERATURES OVER NORTHERN NEW ENGLAND. THE TROUGH AND ASSOCIATED AREA OF BELOW NORMAL HEIGHTS OVER ALASKA SHOULD LEAD TO BELOW NORMAL TEMPERATURES OVER MOST OF THE STATE. ZONAL FLOW OVER MUCH OF THE NORTHERN CONUS ALONG WITH WEAK RIDGING OVER THE SOUTH/CENTRAL STATES SHOULD LEAD TO NEAR TO ABOVE NORMAL TEMPERATURES FOR MOST OF THE REST OF THE COUNTRY. ABOVE NORMAL HEIGHTS OVER THE EASTERN CONUS ARE EXPECTED TO LEAD TO NEAR TO BELOW NORMAL PRECIPITATION FOR THE EASTERN THIRD OF THE NATION. ABOVE NORMAL PRECIPITATION IS LIKELY OVER THE NORTHERN PACIFIC NORTHWEST AND ALASKAN PANHANDLE DUE TO ONSHORE FLOW. THE TROUGH FORECAST OVER THE SOUTHWESTERN CONUS MAY LEAD TO AN AREA OF ABOVE NORMAL PRECIPITATION IN THAT REGION WHILE FRONTAL PASSAGES MAY LEAD TO ABOVE NORMAL PRECIPITATION NEAR AND WEST OF THE GREAT LAKES. DRIER THAN NORMAL CONDITIONS ARE LIKELY OVER THE NORTHERN PART OF ALASKA DUE TO SUBSIDENCE UPSTREAM OF THE ALASKAN TROUGH. TODAYS OFFICIAL 500-HPA BLEND CONSISTS OF 10 PERCENT OF TODAY'S OPERATIONAL 6Z GFS CENTERED ON DAY 8...10 PERCENT OF TODAY'S OPERATIONAL ECMWF CENTERED ON DAY 7...15 PERCENT OF TODAY'S 0Z GFS ENSEMBLE MEAN CENTERED ON DAY 8...15 PERCENT OF TODAY'S 6Z GFS ENSEMBLE MEAN CENTERED ON DAY 8...15 PERCENT OF TODAY'S GFS SUPERENSEMBLE MEAN CENTERED ON DAY 8...10 PERCENT OF TODAY'S CANADIAN ENSEMBLE MEAN CENTERED ON DAY 8...AND 25 PERCENT OF TODAY'S EUROPEAN ENSEMBLE MEAN CENTERED ON DAY 7. MODEL(S) OF THE DAY: ECMWF ENSEMBLE FORECAST CONFIDENCE FOR THE 6-10 DAY PERIOD IS ABOVE AVERAGE... 4 ON A SCALE OF 1 TO 5... DUE TO GOOD AGREEMENT OF THE MODEL SOLUTIONS AND FAIRLY GOOD AGREEMENT OF THE FORECAST TOOLS. THE 6-10 DAY TEMPERATURE PROG IS BASED ON THE KLEIN...NEURAL NET... AND ANALOG SPECIFICATIONS FROM THE OFFICIAL BLENDED HEIGHT FIELD... THE CPC AUTO TEMPERATURE FORECAST... 2-METER UNCALIBRATED AND CALIBRATED TEMPERATURES FROM THE GFS ENSEMBLE MEAN... THE CDC TEMPERATURE TOOL ... BIAS-CORRECTED 850-HPA TEMPERATURES FROM THE 0Z OPERATIONAL GFS... KLEIN AND NEURAL NET PROBABILITES FROM THE VARIOUS ENSEMBLES... AND THE EXPERIMENTAL NORTH AMERICAN ENSEMBLE FORECAST SYSTEM TEMPERATURE TOOL. THE 6-10 DAY PRECIPITATION PROG IS BASED ON THE NEURAL NET AND ANALOG SPECIFICATIONS FROM THE OFFICIAL BLENDED HEIGHT FIELD... THE CPC AUTO PRECIPITATION FORECAST... CPC CALIBRATED PRECIPITATION PERCENTAGES FROM THE GFS ENSEMBLE MEMBERS... THE CDC REFORECAST PRECIPITATION TOOL... AND NEURAL NET PROBABILITIES FROM THE VARIOUS ENSEMBLES. 8-14 DAY OUTLOOK FOR MAR 21 - 27 2007: FOR THE 8-14 DAY PERIOD THE GFS SUPERENSMBLE MEAN AND CANADIAN ENSEMBLE MEAN FORECAST A SLOW PROGRESSION OF THE 500-HPA HEIGHT PATTERN FROM THAT FORECAST FOR THE 6-10 DAY PERIOD. THE TROUGH NORTHEAST OF HUDSON BAY IS FORECAST TO LIFT OUT TOWARDS GREENLAND WHILE THE RIDGE OVER THE SOUTH/CENTRAL CONUS AND THE TROUGH OVER THE SOUTHWESTERN U.S. ARE FORECAST TO MOVE SLOWLY EASTWARD. A TROUGH IS FORECAST TO REMAIN ANCHORED OVER ALASKA. THE 6Z OPERATIONAL GFS IS SIMILAR IN PHASE TO THE GFS SUPERENSEMBLE MEAN BUT IS MUCH MORE AMPLIFIED. THE 0Z GFS OPERATIONAL RUN DEPICTS A LESS AMPLIFIED CIRCULATION PATTERN COMPARED TO THE 6Z OPERATIONAL RUN AND HOLDS TROUGH ENERGY FURTHER WEST OFF THE CALIFORNIA COAST. HEIGHTS OVER MOST OF THE CONUS ARE FORECAST TO BE ABOVE NORMAL EXCEPT OVER THE EXTREME SOUTHERN PART OF THE COUNTRY WHERE NEAR NORMAL HEIGHTS ARE FORECAST. BELOW NORMAL HEIGHTS CONTINUE TO BE FORECAST OVER ALASKA. THE MODELS SHOW FAIRLY GOOD CONTINUITY WITH RESPECT TO THEIR FORECASTS FROM YESTERDAY. THE TEMPERATURE AND PRECIPITATION ANOMALY PATTERNS FORECAST FOR THE 8-14 DAY PERIOD ARE GENERALLY SIMILAR TO THE PATTERNS FORECAST FOR THE 6-10 DAY PERIOD EXCEPT DISPLACED SLIGHTLY EASTWARD. THE OFFICIAL 8-14 DAY HEIGHT PROG CONSISTS OF 15 PERCENT OF TODAY'S OPERATIONAL 0Z GFS CENTERED ON DAY 11...5 PERCENT OF TODAY'S OPERATIONAL 6Z GFS CENTERED ON DAY 11...20 PERCENT OF TODAY'S 0Z GFS ENSEMBLE MEAN CENTERED ON DAY 11...20 PERCENT OF TODAY'S 6Z GFS ENSEMBLE MEAN CENTERED ON DAY 11...35 PERCENT OF TODAY'S GFS SUPERENSEMBLE MEAN CENTERED ON DAY 11...AND 5 PERCENT OF TODAY'S CANADIAN ENSEMBLE MEAN CENTERED ON DAY 11. FORECAST CONFIDENCE FOR THE 8-14 DAY PERIOD IS ABOVE AVERAGE... 4 ON A SCALE OF 1 TO 5 DUE TO GOOD MODEL AND FORECAST TOOL AGREEMENT. THE 8-14 DAY TEMPERATURE PROG IS BASED ON THE THE KLEIN... NEURAL NET... AND ANALOG SPECIFICATIONS FROM THE BLENDED HEIGHT FIELD ... THE CALIBRATED AND UNCALIBRATED 2-METER TEMPERATURES FROM THE GFS ENSEMBLE MEAN... THE CPC AUTO TEMPERATURE FORECAST... THE CDC FORECAST TEMPERATURE TOOL... BIAS-CORRECTED 850-HPA TEMPERATURES FROM THE 0Z OPERATIONAL GFS... KLEIN AND NEURAL NET PROBABILITIES FROM THE GFS AND CANADIAN ENSEMBLES AND THE EXPERIMENTAL NORTH AMERICAN ENSEMBLE FORECAST SYSTEM TEMPERATURE TOOL. THE 8-14 DAY PRECIPITATION PROG IS BASED ON THE NEURAL NET AND ANALOG SPECIFICATIONS FROM THE OFFICIAL BLENDED HEIGHT FIELD... THE CPC AUTO PRECIPITATION FORECAST... CPC CALIBRATED PRECIPITATION PERCENTAGES FROM THE GFS ENSEMBLE MEMBERS... AND THE CDC CALIBRATED PRECIPITATION FORECAST. FORECASTER: R. SCHECHTER NOTES: OPERATIONAL CHANGE: AS OF JULY 5 2005 SHADED MAPS HAVE REPLACED THE CONTOUR-ONLY MAPS ON THE CPC WEB SITE. THE CONTOURED MAPS ARE STILL AVAILABLE AT THEIR CURRENT FILE NAMES - SO DIRECT-LINKED USERS ARE NOT AFFECTED. AWIPS GRAPHICS ARE ALSO NOT AFFECTED BY THIS CHANGE. AUTOMATED FORECASTS ARE ISSUED ON SATURDAY AND SUNDAY. OTHERWISE - FORECASTS INCORPORATE FORECASTER INPUT. THE NOTATION FOR THE CATEGORICAL FORECAST INDICATED ON THE MAPS IS THE SAME AS THAT IN THE TABLES: A-ABOVE N-NEAR NORMAL B-BELOW IN THE SOUTHWEST AND OTHER CLIMATOLOGICALLY DRY REGIONS - THERE WILL BE A GREATER THAN 33.3% CHANCE OF NO PRECIPITATION AND OCCASIONALLY EVEN A NORMAL (I.E. MEDIAN) VALUE OF ZERO - ESPECIALLY DURING THE DRY SEASONS. IN SUCH CASES A FORECAST OF NEAR NORMAL IS EFFECTIVELY A FORECAST OF LITTLE OR NO PRECIPITATION. THE NARRATIVE DESCRIPTION OF THE FORECAST PATTERNS FOR TEMPERATURE AND PRECIPITATION FOR BOTH THE 6-10 OR 8-14 DAY PERIODS HAS BEEN DISCONTINUED. THE STATE TABLES FOR BOTH THE 6-10 AND 8-14 DAY PERIODS ARE NOW CONTAINED IN THIS MESSAGE...AVAILABLE AS PMDMRD ON AWIPS. THE CLIMATE PREDICTION CENTER USES 1971-2000 BASE PERIOD MEANS FOR TEMPERATURE...PRECIPITATION...AND 500-HPA HEIGHTS AS REFERENCE IN THE CLIMATE OUTLOOKS. THE NEXT SET OF LONG-LEAD MONTHLY AND SEASONAL OUTLOOKS WILL BE RELEASED ON MARCH 15. NEW NOTE EFFECTIVE MAR 16 2004: THE GLOSSARY FORMERLY FOUND AT THIS LOCATION WILL NO LONGER BE TRANSMITTED AS PART OF THIS MESSAGE. IF YOU WISH TO SEE THE DEFINITIONS OF TERMS USED IN THESE MESSAGES... PLEASE GO TO THE CPC WEB PAGE AT (USE LOWER CASE) HTTP://WWW.CPC.NCEP.NOAA.GOV AND FOLLOW THE APPROPRIATE LINKS. ANALOGS TO THE 5 DAY MEAN OBSERVED PATTERN CENTERED 3 DAYS AGO (D-3) FOR THE REGION FROM 20N to 70N LATITUDE AND 175E to 60W LONGITUDE INCLUDE THE 5 DAY PERIODS CENTERED ON THE FOLLOWING DATES: 19920222 - 19720312 - 19660309 - 19950222 - 19940302 ANALOGS TO THE 7 DAY MEAN OBSERVED PATTERN CENTERED 4 DAYS AGO (D-4) FOR THE REGION FROM 20N to 70N LATITUDE AND 175E to 60W LONGITUDE INCLUDE THE 5 DAY PERIODS CENTERED ON THE FOLLOWING DATES: 19950221 - 19970319 - 19720312 - 19920222 - 19940302 6 to 10 day Outlook Table OUTLOOK FOR MAR 19 - 23, 2007 STATE TEMP PCPN STATE TEMP PCPN STATE TEMP PCPN WASHINGTON A N OREGON A N NRN CALIF A N SRN CALIF A N IDAHO A N NEVADA A N W MONTANA A B E MONTANA A B WYOMING A B UTAH A N ARIZONA A A COLORADO A N NEW MEXICO A A N DAKOTA A N S DAKOTA A B NEBRASKA A B KANSAS A N OKLAHOMA A N N TEXAS A N S TEXAS A N W TEXAS A A MINNESOTA A A IOWA A A MISSOURI A N ARKANSAS A N LOUISIANA A B WISCONSIN N A ILLINOIS A A MISSISSIPPI A B MICHIGAN N A INDIANA A N OHIO N N KENTUCKY A B TENNESSEE A B ALABAMA A B NEW YORK N N VERMONT N B NEW HAMP N B MAINE B B MASS N B CONN N B RHODE IS N B PENN N B NEW JERSEY N B W VIRGINIA A B MARYLAND N B DELAWARE N B VIRGINIA N B N CAROLINA A B S CAROLINA A B GEORGIA A B FL PNHDL A B FL PENIN N N AK N SLOPE B B AK ALEUTIAN B B AK WESTERN B B AK INT BSN B N AK S INT B N AK SO COAST B N AK PNHDL N A 8 to 14 day Outlook Table OUTLOOK FOR MAR 21 - 27, 2007 STATE TEMP PCPN STATE TEMP PCPN STATE TEMP PCPN WASHINGTON A N OREGON A B NRN CALIF A B SRN CALIF N B IDAHO A B NEVADA A B W MONTANA A B E MONTANA A B WYOMING A B UTAH A B ARIZONA N N COLORADO A N NEW MEXICO N A N DAKOTA A B S DAKOTA A N NEBRASKA A A KANSAS A A OKLAHOMA A A N TEXAS A A S TEXAS A A W TEXAS A A MINNESOTA A A IOWA A A MISSOURI A A ARKANSAS A A LOUISIANA A N WISCONSIN A A ILLINOIS A A MISSISSIPPI A N MICHIGAN N A INDIANA A N OHIO N N KENTUCKY A N TENNESSEE A N ALABAMA A N NEW YORK N B VERMONT N B NEW HAMP N B MAINE B B MASS N B CONN N B RHODE IS N B PENN N B NEW JERSEY N B W VIRGINIA A B MARYLAND N B DELAWARE N B VIRGINIA A B N CAROLINA A B S CAROLINA A B GEORGIA A B FL PNHDL A B FL PENIN N N AK N SLOPE B B AK ALEUTIAN B N AK WESTERN B B AK INT BSN B A AK S INT B A AK SO COAST B A AK PNHDL N A LEGEND TEMPS WITH RESPECT TO NORMAL PCPN WITH RESPECT TO MEDIAN A - ABOVE N - NEAR NORMAL A - ABOVE N - NEAR MEDIAN B - BELOW B - BELOW THE FORECAST CLASSES REPRESENT AVERAGES FOR EACH STATE. NORMAL VALUES - WHICH MAY VARY WIDELY ACROSS SOME STATES - ARE AVAILABLE FROM YOUR LOCAL WEATHER SERVICE FORECAST OFFICE. FOR ADDITIONAL INFORMATION SEE MESSAGE FXUS06 KWBC - ON AWIPS AS PMDMRD. $$