963
FXUS06 KWBC 272042
PMDMRD
PROGNOSTIC DISCUSSION FOR 6 TO 10 AND 8 TO 14 DAY OUTLOOKS
NWS CLIMATE PREDICTION CENTER COLLEGE PARK, MD
300 PM EST MON JANUARY 27 2025
6-10 DAY OUTLOOK FOR FEB 02 - 06 2025
THERE IS GOOD AGREEMENT BETWEEN THE LATEST ECMWF, GEFS, AND CANADIAN ENSEMBLE
MEAN 500-HPA HEIGHT FORECASTS ON THE PREDICTED CIRCULATION PATTERN ACROSS NORTH
AMERICA FOR THE 6-10 DAY PERIOD. DYNAMICAL MODELS PREDICT AN AMPLIFIED RIDGE
OVER MAINLAND ALASKA, A DOWNSTREAM TROUGH OVER THE NORTHWESTERN CONTIGUOUS U.S.
(CONUS), AND A RIDGE OVER THE SOUTHEASTERN CONUS. POSITIVE 500-HPA HEIGHT
ANOMALIES ARE PREDICTED ACROSS THE SOUTHERN TIER AND EASTERN CONUS, EXCLUDING
PARTS OF THE NORTHEAST, AS WELL AS ACROSS ALASKA, BY RECENT ENSEMBLE MEANS OF
THE GEFS, ECMWF AND CANADIAN MODELS. NEGATIVE 500-HPA HEIGHT ANOMALIES ARE
PREDICTED OVER THE NORTHWESTERN CONUS.
ABOVE NORMAL TEMPERATURES ARE LIKELY FOR THE ALEUTIANS AND MOST OF MAINLAND
ALASKA, UNDER A PREDICTED RIDGE. BELOW NORMAL TEMPERATURES ARE FAVORED FOR
PARTS OF SOUTHEASTERN MAINLAND ALASKA AND SOUTHEAST ALASKA, UNDER ANOMALOUS
NORTHERLY FLOW. BELOW NORMAL TEMPERATURES ARE SLIGHTLY FAVORED RIGHT ALONG THE
PACIFIC COAST OF CALIFORNIA, CONSISTENT WITH MOST DYNAMICAL MODEL FORECASTS AND
THE TEMPERATURE CONSOLIDATION. BELOW NORMAL TEMPERATURES ARE LIKELY FOR THE
PACIFIC NORTHWEST ACROSS THE NORTHERN ROCKIES INTO THE NORTHERN PLAINS, UNDER
NEGATIVE 500-HPA HEIGHT ANOMALIES. BELOW NORMAL TEMPERATURES ARE ALSO FAVORED
FOR MUCH OF THE NORTHEAST, CONSISTENT WITH MOST DYNAMICAL MODEL TOOLS. ABOVE
NORMAL TEMPERATURES ARE LIKELY ACROSS THE SOUTHERN CONUS, EXCLUDING THE
CALIFORNIA COAST, UNDER POSITIVE 500-HPA HEIGHT ANOMALIES. SEA SURFACE
TEMPERATURES ARE ABOVE LONG TERM AVERAGES SURROUNDING THE HAWAIIAN ISLANDS
LEADING TO LIKELY ABOVE NORMAL TEMPERATURES.
ABOVE NORMAL PRECIPITATION IS FAVORED FOR THE NORTHWESTERN COAST OF MAINLAND
ALASKA, WITH SOME LIGHT PRECIPITATION EXPECTED UNDER ONSHORE FLOW. BELOW NORMAL
PRECIPITATION IS FAVORED FOR THE SOUTH COAST OF MAINLAND ALASKA AND SOUTHEAST
ALASKA, UNDER THE PREDICTED RIDGE AND PREDOMINATELY NORTHERLY FLOW. OVER THE
CONUS, NEAR TO ABOVE NORMAL PRECIPITATION IS FAVORED, EXCLUDING ONLY PARTS OF
THE SOUTHWEST AND SOUTHEAST, WITH A PROGRESSIVE TROUGH OVER THE NORTHWESTERN
CONUS. BELOW NORMAL PRECIPITATION IS FAVORED FOR PARTS OF THE SOUTHWEST AND
SOUTHEAST, UNDER POSITIVE 500-HPA HEIGHT ANOMALIES. ABOVE NORMAL PRECIPITATION
IS FAVORED ACROSS HAWAII, CONSISTENT WITH THE PRECIPITATION CONSOLIDATION.
THE OFFICIAL 6-10 DAY 500-HPA HEIGHT BLEND CONSISTS OF 34% OF TODAY'S 0Z GFS
ENSEMBLE MEAN CENTERED ON DAY 8, 33% OF TODAY'S 0Z EUROPEAN ENSEMBLE MEAN
CENTERED ON DAY 8, AND 33% OF TODAY'S 0Z CANADIAN ENSEMBLE MEAN CENTERED ON DAY
8
FORECAST CONFIDENCE FOR THE 6-10 DAY PERIOD: ABOVE AVERAGE, 4 OUT OF 5, DUE TO
GOOD AGREEMENT AMONG THE DYNAMICAL MODEL HEIGHT FORECASTS AND AN AMPLIFIED
PATTERN, OFFSET BY SMALL DIFFERENCES IN SOME AREAS IN TEMPERATURE AND
PRECIPITATION TOOLS AND A PROGRESSIVE PATTERN.
8-14 DAY OUTLOOK FOR FEB 04 - 10 2025
DYNAMICAL MODEL FORECASTS FROM THE ECMWF, GEFS, AND CANADIAN ENSEMBLE MEANS ARE
IN GENERAL OVERALL AGREEMENT ON THE AVERAGE LARGE SCALE 500-HPA HEIGHT PATTERN
IN THE WEEK-2 PERIOD. A RIDGE PERSISTS OVER ALASKA THROUGH THE 8-14 DAY PERIOD
WITH SOME EASTWARD PROGRESSION AND DEAMPLIFICATION. A TROUGH IS PREDICTED OVER
THE NORTHWESTERN CONUS, THAT IS MORE AMPLIFIED IN THE GEFS ENSEMBLE MEAN
RELATIVE TO THE ECMWF AND CANADIAN MODELS. POSITIVE 500-HPA HEIGHT ANOMALIES
CONTINUE TO BE PREDICTED OVER THE SOUTHERN TIER AND EASTERN HALF OF THE CONUS
IN THE 8-14 DAY PERIOD.
THE TEMPERATURE PATTERN ACROSS ALASKA IN THE 8-14 DAY PERIOD IS SIMILAR TO THE
PATTERN IN THE 6-10 DAY PERIOD FORECAST, WITH LOWER PROBABILITIES AS
UNCERTAINTY INCREASES. ABOVE NORMAL TEMPERATURES ARE FAVORED OVER THE ALEUTIANS
AND MUCH OF MAINLAND ALASKA, WITH BELOW NORMAL TEMPERATURES FAVORED FOR PARTS
OF SOUTHEASTERN MAINLAND ALASKA AND SOUTHEAST ALASKA. IT IS NOTED THAT
TEMPERATURES AT LOWER ELEVATIONS IN MAINLAND ALASKA HAVE A LOWER LIKELIHOOD OF
BEING ABOVE NORMAL AS TEMPERATURES AT HIGHER ELEVATIONS, DUE TO POTENTIAL
TEMPERATURE INVERSIONS. A PERSISTENT TROUGH OVER THE NORTHWESTERN CONUS LEADS
TO LIKELY BELOW NORMAL TEMPERATURES FOR MUCH OF THE CONUS TO THE WEST OF THE
ROCKIES, AS WELL AS THE NORTH-CENTRAL CONUS. NEAR TO BELOW NORMAL TEMPERATURES
ARE FAVORED OVER THE NORTHEAST, CONSISTENT WITH MOST MODEL TEMPERATURE FORECAST
TOOLS. ABOVE NORMAL TEMPERATURES ARE LIKELY FROM THE SOUTHWEST ACROSS THE
SOUTHERN PLAINS INTO THE SOUTHEASTERN CONUS, UNDER POSITIVE 500-HPA HEIGHT
ANOMALIES.
BELOW NORMAL PRECIPITATION IS FAVORED FOR SOUTHERN MAINLAND ALASKA UNDER
ANOMALOUS NORTHERLY FLOW. A TROUGH PROGRESSING ACROSS THE WESTERN CONUS IN
DYNAMICAL MODEL FORECASTS LEADS TO ENHANCED PROBABILITIES FOR ABOVE NORMAL
PRECIPITATION ACROSS MOST OF THE CONUS, EXCLUDING ONLY PARTS OF THE SOUTHWEST,
WHERE NEAR TO BELOW NORMAL PRECIPITATION IS FAVORED, AND PARTS OF GEORGIA AND
FLORIDA, WHERE NEAR NORMAL IS FAVORED.
ABOVE NORMAL TEMPERATURES AND ABOVE NORMAL PRECIPITATION ARE FAVORED ACROSS THE
HAWAIIAN ISLANDS, WITH ABOVE AVERAGE SEA SURFACE TEMPERATURES SURROUNDING THE
ISLANDS AND CONSISTENT WITH THE PRECIPITATION CONSOLIDATION.
THE OFFICIAL 8-14 DAY 500-HPA HEIGHT BLEND CONSISTS OF: 34% OF TODAY'S 0Z GFS
ENSEMBLE MEAN CENTERED ON DAY 11, 33% OF TODAY'S 0Z EUROPEAN ENSEMBLE MEAN
CENTERED ON DAY 11, AND 33% OF TODAY'S 0Z CANADIAN ENSEMBLE MEAN CENTERED ON
DAY 11
FORECAST CONFIDENCE FOR THE 8-14 DAY PERIOD: ABOUT AVERAGE, 3 OUT OF 5, DUE TO
GOOD AGREEMENT AMONG THE DYNAMICAL MODEL HEIGHT FORECASTS, OFFSET BY
DIFFERENCES IN TEMPERATURE AND PRECIPITATION TOOLS IN SOME AREAS AND SOME
PROGRESSION OF THE MID-LEVEL HEIGHT PATTERN DURING THE PERIOD.
FORECASTER: D COLLINS
NOTES:
AUTOMATED FORECASTS ARE ISSUED ON SATURDAY AND SUNDAY. OCCASIONALLY MANUAL
INTERVENTION IS NECESSARY TO ADDRESS QUALITY CONTROL AND CONSISTENCY ISSUES. IN
THESE CASES, FORECASTS ARE MANUALLY DRAWN BUT A FULL DISCUSSION IS NOT ISSUED.
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
THE TEMPERATURE MAP SHOWS REGIONS WITH > 33% CHANCE OF BEING WARMER (ORANGE,
"A"), COLDER (BLUE, "B"), OR CLOSE TO (UNSHADED, "N"). HISTORICAL AVERAGE
VALUES FOR THE CALENDAR PERIOD OF THE FORECAST (DASHES, "F"). LABELS ON THE
SHADED LINES GIVE THE PROBABILITY (> 33%) OF THE MORE LIKELY CATEGORY (B OR A).
PROBABILITY OF N IS ALWAYS < 40%.
THE PRECIPITATION MAP SHOWS REGIONS WITH > 33% CHANCE OF BEING WETTER (GREEN,
"A"), DRIER (TAN, "B"), OR CLOSE TO (UNSHADED, "N"). HISTORICAL MEDIAN VALUES
FOR THE CALENDAR PERIOD OF THE FORECAST (DASHES, "INCHES"). LABELS ON THE
SHADED LINES GIVE THE PROBABILITY (> 33%) OF THE MORE LIKELY CATEGORY (B OR A).
PROBABILITY OF N IS ALWAYS < 40%.
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 CLIMATE PREDICTION CENTER USES 1991-2020 BASE PERIOD MEANS AS REFERENCE IN
THE CLIMATE OUTLOOKS.
THE NEXT SET OF LONG-LEAD MONTHLY AND SEASONAL OUTLOOKS WILL BE RELEASED ON
FEBRUARY 20.
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:
20080120 - 19910121 - 19590201 - 19760204 - 20030205
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 7 DAY PERIODS CENTERED ON THE FOLLOWING DATES:
20030204 - 20080119 - 19760203 - 19910121 - 19890209
6-10 DAY OUTLOOK TABLE
OUTLOOK FOR FEB 02 - 06 2025
STATE TEMP PCPN STATE TEMP PCPN STATE TEMP PCPN
WASHINGTON B A OREGON B A NRN CALIF B A
SRN CALIF A N IDAHO B A NEVADA A A
W MONTANA B A E MONTANA B A WYOMING B A
UTAH A A ARIZONA A B COLORADO A A
NEW MEXICO A B N DAKOTA B A S DAKOTA B A
NEBRASKA B A KANSAS A A OKLAHOMA A A
N TEXAS A N S TEXAS A N W TEXAS A B
MINNESOTA B A IOWA N A MISSOURI A A
ARKANSAS A A LOUISIANA A N WISCONSIN B A
ILLINOIS A A MISSISSIPPI A N MICHIGAN N A
INDIANA A A OHIO A A KENTUCKY A A
TENNESSEE A N ALABAMA A B NEW YORK B N
VERMONT B N NEW HAMP B N MAINE B N
MASS B N CONN B N RHODE IS B N
PENN N N NEW JERSEY B N W VIRGINIA A N
MARYLAND A N DELAWARE N N VIRGINIA A N
N CAROLINA A B S CAROLINA A B GEORGIA A B
FL PNHDL A B FL PENIN A B AK N SLOPE A A
AK ALEUTIAN A B AK WESTERN A N AK INT BSN A N
AK S INT N B AK SO COAST A B AK PNHDL B B
8-14 DAY OUTLOOK TABLE
OUTLOOK FOR FEB 04 - 10 2025
STATE TEMP PCPN STATE TEMP PCPN STATE TEMP PCPN
WASHINGTON B A OREGON B A NRN CALIF B A
SRN CALIF B A IDAHO B A NEVADA B A
W MONTANA B A E MONTANA B A WYOMING B A
UTAH A A ARIZONA A N COLORADO B A
NEW MEXICO A N N DAKOTA B A S DAKOTA B A
NEBRASKA B A KANSAS B A OKLAHOMA N A
N TEXAS A A S TEXAS A A W TEXAS A N
MINNESOTA B A IOWA B A MISSOURI B A
ARKANSAS A A LOUISIANA A A WISCONSIN B A
ILLINOIS N A MISSISSIPPI A A MICHIGAN B A
INDIANA A A OHIO A A KENTUCKY A A
TENNESSEE A A ALABAMA A A NEW YORK N A
VERMONT N A NEW HAMP N A MAINE N A
MASS N A CONN N A RHODE IS N A
PENN N A NEW JERSEY N A W VIRGINIA A A
MARYLAND A A DELAWARE A A VIRGINIA A A
N CAROLINA A A S CAROLINA A A GEORGIA A A
FL PNHDL A N FL PENIN A N AK N SLOPE A A
AK ALEUTIAN A B AK WESTERN A N AK INT BSN A N
AK S INT N B AK SO COAST A B AK PNHDL B B
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.
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