582
FXUS06 KWBC 091904
PMDMRD
PROGNOSTIC DISCUSSION FOR 6 TO 10 AND 8 TO 14 DAY OUTLOOKS
NWS CLIMATE PREDICTION CENTER COLLEGE PARK, MD
300 PM EDT WED AUGUST 09 2023
6-10 DAY OUTLOOK FOR AUG 15 - 19 2023
LIKE YESTERDAY, THE GFS, ECMWF, AND CANADIAN ENSEMBLE MEANS AND THE 0Z
DETERMINISTIC ECMWF MODELS ARE IN GOOD AGREEMENT ON THE PREDICTED LONGWAVE
PATTERN DURING THE 6-10 DAY PERIOD. HOWEVER, MOST TOOLS ARE SHOWING LESSER
ANOMALIES FOR MOST 500-HPA FEATURES, HINTING AT THE POTENTIAL FOR A PATTERN
CHANGE BEGINNING AT THE END OF THE PERIOD. FORECAST MID-LEVEL HEIGHT ANOMALY
CENTERS HAVE RETROGRADED SLIGHTLY, WITH A TROUGH IN THE MIDDLE OF NORTH AMERICA
CENTERED IN THE SOUTHERN PRAIRIES, AND ANOMALOUSLY HIGH 500-HPA HEIGHTS
CENTERED IN THE NORTH PACIFIC OFF THE NORTHWEST CONUS COAST. EAST OF THE
CENTRAL NORTH AMERICAN TROUGH, ABOVE-NORMAL 500-HPA HEIGHTS REMAIN ALONG THE
SOUTHERN TIER OF THE CONUS, AND SLOWLY BEGIN BUILDING NORTHEASTWARD OVER A
LARGE PART OF THE ATLANTIC SEABOARD. MEANWHILE, THE STRONG MID-LEVEL TROUGH
CENTERED NEAR THE ALEUTIANS IS SLIGHTLY FARTHER SOUTHWEST AND WEAKER THAN
YESTERDAY, CONTINUING A RECENT TREND.
DESPITE THE BROAD PATTERN AGREEMENT, THERE IS AGAIN CONSIDERABLY LESS
CONSISTENCY IN THE VARIOUS TEMPERATURE AND PRECIPITATION TOOLS, SUCH AS THE
CALIBRATED, RE-FORECAST, AND CONSOLIDATED TOOLS. THE FORECAST LEANS TOWARD THE
CONSOLIDATED TOOLS AND THE OTHER GUIDANCE THAT HAS BEEN MOST CONSISTENT OF
LATE, AND MOST ACCURATE OVER THE PAST FEW WEEKS. IN SOME CASES, OBSERVATIONS
OVER THE PAST FEW WEEKS WITH SIMILAR PATTERNS WERE CONSIDERED, WHICH DIDN’T
AGREE PARTICULARLY WELL WITH ANY OF THE FORECAST TOOLS AT THE TIME.
ANOMALOUS RIDGING SUPPORTS INCREASED ABOVE-NORMAL TEMPERATURE PROBABILITIES
THROUGHOUT THE WESTERN AND SOUTHERN CONUS, AND BUILDING HEIGHTS ALONG THE EAST
COAST IN THE WAKE OF THE RETROGRADING CENTRAL NORTH AMERICAN TROUGH FAVOR ABOVE
NORMAL TEMPERATURES THERE AS WELL. ELSEWHERE ACROSS THE CONUS, TEMPERATURE
GUIDANCE IS INCONSISTENT ACROSS THE PLAINS, MIDDLE AND UPPER MISSISSIPPI
VALLEY, AND LOWER OHIO VALLEY. GEFS-BASED TOOLS BRING WARM AIR STRONGLY
NORTHWARD INTO THE CENTRAL AND NORTHERN CONUS, REACHING THE CANADIAN BORDER.
MEANWHILE, TOOLS BASED ON THE CANADIAN ENSEMBLE KEEP SUBNORMAL TEMPERATURES
MUCH FARTHER SOUTH AND EAST INTO THE LOWER OHIO VALLEY, AND THE ECMWF
BIAS-CORRECTED AND REFORECAST TOOLS ESSENTIALLY SPLIT THE DIFFERENCE. GEFS
GUIDANCE HAS SHOWN A STRONG WARM BIAS FROM THE CENTRAL PLAINS INTO THE OHIO
RIVER VALLEY RECENTLY, SO ITS MUCH WARMER SOLUTION IS NOT FAVORED AT THIS TIME.
BASED ON OTHER GUIDANCE, SLIGHTLY ABOVE-NORMAL ODDS FOR WARMER THAN NORMAL
WEATHER STRETCH FROM SOUTHERN PORTIONS OF THE CENTRAL PLAINS THROUGH THE LOWER
OHIO VALLEY, WITH ODDS BEING NEAR NORMAL OR FAVORING SUBNORMAL TEMPERATURES IN
THE NORTHERN PLAINS AND UPPER MIDWEST. MEANWHILE, THE TROUGH SOUTH OF THE
ALEUTIANS FAVORS SUBNORMAL TEMPERATURES IN SOUTHWESTERN PARTS OF ALASKA CLOSEST
TO THE ANOMALOUS NEGATIVE 500-HPA HEIGHT CENTER, WHILE INCREASING 500-HPA
HEIGHTS MAKE THE TEMPERATURE FORECAST IN OTHER PARTS OF ALASKA LESS CLEAR-CUT.
BASED PRIMARILY ON THE REFORECAST TOOLS, A SLIGHT TILT OF THE ODDS TOWARD
WARMTH IS INDICATED ACROSS THE NORTHERN TIER OF MAINLAND ALASKA AND IN THE
SOUTHEASTERN PART OF THE STATE. BIAS-CORRECTED ENSEMBLE MODEL OUTPUT GENERALLY
INDICATES COOLER THAN NORMAL WEATHER ACROSS SOUTHEASTERN ALASKA, BUT THIS IS
NOT CONSISTENT WITH THE EXPECTED MID-LEVEL PATTERN, AND THESE TOOLS HAVE BEEN
COLDER THAN OBSERVATIONS FOR THE PAST COUPLE OF WEEKS, AND SO ARE NOT FAVORED
AT THIS TIME.
THE MID-LEVEL TROUGH OVER CENTRAL NORTH AMERICA FAVORS ENHANCED ABOVE-NORMAL
PRECIPITATION PROBABILITIES TO ITS SOUTH AND EAST, ACROSS THE NORTHERN TIER OF
STATES FROM THE INTERMOUNTAIN WEST EASTWARD THROUGH THE NORTHEAST. THE
PREPONDERANCE OF GUIDANCE FOLLOWS THIS SOLUTION, BUT NONE IS PARTICULARLY
ROBUST IN INDICATING WETNESS ACROSS THIS REGION. SEVERAL TOOLS SLIGHTLY FAVOR
ABOVE-NORMAL PRECIPITATION FARTHER SOUTH AS WELL, FROM CENTRAL TEXAS EASTWARD
ACROSS THE GULF COAST STATES. HOWEVER, OBSERVED RAINFALL AMOUNTS IN THIS REGION
HAVE BEEN CONSIDERABLY LOWER THAN INDICATED BY GUIDANCE RECENTLY, AND THE
CURRENT FORECAST IS CONSISTENT WITH OBSERVED PRECIPITATION AMOUNTS DURING THE
PAST FEW WEEKS UNDER A SIMILAR 500-HPA HEIGHT PATTERN. IN ADDITION, THE
CONSOLIDATED 6-10 DAY PRECIPITATION FORECAST TOOL HAS SLOWLY SHIFTED TOWARD
FAVORING THE DRIER SCENARIO IN THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY
OVER THE PAST FEW DAYS. FARTHER WEST, THE ANOMALOUS 500-HPA RIDGE FAVORS NEAR-
OR BELOW-NORMAL PRECIPITATION ACROSS MUCH OF THE WEST, CONSISTENT WITH A
PATTERN THAT WOULD KEEP THE SOUTHWEST MONSOON CIRCULATION RELATIVELY MODEST.
THE DRIER TOOLS WERE ALSO PREFERRED FOR THE PACIFIC NORTHWEST AND INTERMOUNTAIN
WEST GIVEN THE STRENGTH OF THE RIDGE ALOFT. THE ONE EXCEPTION IS OVER NORTHERN
CALIFORNIA, WHERE A SOUTH-SOUTHWESTERLY FLOW ALOFT, SOUTH OF THE POSITIVE
500-HPA ANOMALY CENTER, COULD BRING ABOVE-NORMAL PRECIPITATION INTO NORTHERN
CALIFORNIA. CLIMATOLOGICALLY, PRECIPITATION NORMALS ARE LOW THIS TIME OF YEAR
IN THAT REGION, SO LITTLE PRECIPITATION IS NECESSARY FOR AMOUNTS TO VERIFY
ABOVE NORMAL.
THE OFFICIAL 6-10 DAY 500-HPA HEIGHT BLEND CONSISTS OF 10% OF TODAY'S 0Z GFS
ENSEMBLE MEAN CENTERED ON DAY 8, 5% OF TODAY'S 6Z GFS ENSEMBLE MEAN CENTERED ON
DAY 8, 25% OF TODAY'S 0Z EUROPEAN ENSEMBLE MEAN CENTERED ON DAY 8, AND 60% OF
TODAY'S 0Z CANADIAN ENSEMBLE MEAN CENTERED ON DAY 8
FORECAST CONFIDENCE FOR THE 6-10 DAY PERIOD: ABOUT AVERAGE, 3 OUT OF 5, DUE TO
GOOD AGREEMENT ON THE LONGWAVE PATTERN, REDUCED BY INCONSISTENCY IN TEMPERATURE
AND PRECIPITATION GUIDANCE ALONG WITH OBSERVATIONS OVER THE PAST FEW WEEKS.
8-14 DAY OUTLOOK FOR AUG 17 - 23 2023
ENSEMBLE MEANS ARE IN DECENT AGREEMENT THAT SOME PARTS OF THE LONGWAVE PATTERN
OVER THE NORTH PACIFIC AND NORTH AMERICA WILL RETROGRADE OR WEAKEN DURING
WEEK-2 AS A POTENTIAL PATTERN ADJUSTMENT GETS UNDERWAY. A WEAKENING TROUGH OVER
THE BERING SEA AND ALEUTIANS FLOWS INTO AN AMPLIFIED RIDGE CENTERED OVER THE
GULF OF ALASKA AND EASTERN NORTH PACIFIC, WITH HIGHER MID-LEVEL HEIGHTS
REACHING NORTHWARD TOWARD SOUTHEASTERN ALASKA WITH TIME. SOMEWHAT ABOVE-NORMAL
500-HPA HEIGHTS PERSIST ALONG THE SOUTHERN TIER OF THE CONUS, EXPANDING
SLIGHTLY NORTHWARD AND NORTHEASTWARD AS THE PERIOD PROGRESSES, WHILE THE
MID-LEVEL TROUGH CENTERED NEAR THE MIDDLE OF THE CONTINENT CONTINUES TO DRIFT
WESTWARD OR NORTHWESTWARD WHILE SLOWLY WEAKENING. ONE AREA OF UNCERTAINTY IS
THE PACIFIC NORTHWEST. THE GEFS AND SUPERENSEMBLE KEEP SIGNIFICANTLY
ABOVE-NORMAL 500-HPA HEIGHTS IN THE PACIFIC NORTHWEST WHILE THE EUROPEAN
ENSEMBLE MEAN RESTRICTS ANOMALOUS MID-LEVEL HEIGHTS TO NEAR THE IMMEDIATE
COAST. MEANWHILE, THE CANADIAN ENSEMBLE MEAN HOLDS SIGNIFICANTLY ABOVE-NORMAL
500-HPA HEIGHTS TO THE NORTH AND WEST OF THE NORTHWESTERN CONUS, AND THE 6Z
OPERATIONAL GFS DIGS A SHARP TROUGH INTO THE NORTHWEST WITH TIME. THAT SOLUTION
IS NOT SUPPORTED BY TELECONNECTIONS NOR CONSISTENCY WITH MOST OTHER MODELS,
INCLUDING ITS OWN EARLIER RUNS, AND IS DISCOUNTED AT THIS TIME. TELECONNECTIONS
FAVOR SOMEWHAT ELEVATED 500-HPA HEIGHTS OVER THE PACIFIC NORTHWEST,
APPROXIMATING A COMPROMISE BETWEEN THE EUROPEAN ENSEMBLE MEAN AND THE GEFS
ENSEMBLES.
THIS PATTERN CONTINUES TO SUPPORT INCREASED ABOVE NORMAL TEMPERATURE
PROBABILITIES THROUGHOUT THE WESTERN AND SOUTHERN CONUS DESPITE SIMILAR
GUIDANCE INCONSISTENCIES AS NOTED DURING THE 6-10 DAY PERIOD. BUT WITH SOME
500-HPA FEATURES WEAKENING OR RETROGRADING SLIGHTLY, ODDS FOR WARMTH ARE NOT AS
HIGH DURING WEEK-2. PROBABILITIES STILL EXCEED 70 PERCENT IN FAR SOUTHERN
FLORIDA, WHERE MOST GUIDANCE KEEPS THE BEST CHANCES FOR ABOVE-NORMAL
TEMPERATURES, BUT PEAK CLOSER TO 60 PERCENT IN OTHER PARTS OF THE SOUTHERN AND
WESTERN CONUS, WITH THE HIGHEST CHANCES SUPPRESSED RELATIVELY FAR TO THE SOUTH
ALONG THE SOUTHERN TIER OF THE CONUS. DESPITE ODDS FAVORING ABOVE-NORMAL
TEMPERATURES, CONDITIONS SHOULD COOL OFF SOMEWHAT RELATIVE TO THE PREVIOUS
WEEK, POTENTIALLY BRINGING AN END TO THE PERIOD OF EXCESSIVE HEAT OBSERVED
DURING THE PAST SEVERAL WEEKS, ESPECIALLY ACROSS THE SOUTHERN CONUS. MEANWHILE,
THE NORTHWESTWARD DRIFT OF THE MID-LEVEL TROUGH INITIALLY CENTERED WEST OF
HUDSON BAY INCREASES ODDS FOR SUBNORMAL TEMPERATURES ACROSS THE INTERMOUNTAIN
WEST, TO THE EAST OF THE PACIFIC NORTHWEST WARMTH AND EXTENDING EASTWARD INTO
THE NORTHERN GREAT PLAINS. SOUTHERLY FLOW TO THE EAST OF THE MID-LEVEL TROUGH
SHOULD CONTINUE TO BUILD MID-LEVEL HEIGHTS ALONG THE EASTERN SEABOARD, KEEPING
ENHANCED CHANCES FOR WARMER THAN NORMAL WEATHER THERE. FARTHER WEST, ASTHE
BERING SEA TROUGH SLOWLY DISSIPATES, ENHANCED CHANCES FOR ABOVE-NORMAL
TEMPERATURES BEGIN TO PUSH INTO EASTERN ALASKA IN CONJUNCTION WITH THE POSITIVE
500-HPA HEIGHT ANOMALY CENTER PUSHING TOWARD THE WEST-NORTHWEST OVER THE GULF
OF ALASKA. BIAS-CORRECTED TOOLS REMAIN MUCH COLDER IN SOUTHEASTERN ALASKA THAN
THE RAW ENSEMBLE MEAN OUTPUTS AND THE REFORECAST TOOLS, BUT THE WARMER
SOLUTIONS BETTER FIT THE EXPECTED MID-LEVEL PATTERN, AS DURING THE 6-10 DAY
PERIOD.
GUIDANCE IS NOT IN GOOD AGREEMENT REGARDING PRECIPITATION TOTALS FOR WEEK-2.
THE TROUGH CENTERED IN CENTRAL NORTH AMERICA CONTINUES TO FAVOR ABOVE NORMAL
PRECIPITATION ALONG THE NORTHERN TIER OF THE CONUS. TO THE WEST, AN UPTICK IN
PRECIPITATION IS EXPECTED OVER A LARGE PART OF THE CENTRAL AND WESTERN CONUS AS
THE HEIGHT ANOMALY CENTER NEAR THE PACIFIC NORTHWEST SHIFTS NORTHWESTWARD IN
THE NORTH PACIFIC. THIS ALSO SUPPORTS SOME INCREASED RAINFALL ASSOCIATED WITH A
STRONGER SOUTHWEST MONSOON. NO TOOLS ARE PARTICULARLY ROBUST, HOWEVER, AND SOME
GUIDANCE, SUCH AS THE ECMWF ENSEMBLE REFORECAST TOOLS, PLACE ABNORMALLY LOW
PRECIPITATION ACROSS THE INTERIOR WEST. BUT A PREPONDERANCE OF THE GUIDANCE
SLIGHTLY FAVORS ABOVE-NORMAL PRECIPITATION THROUGHOUT THE INTERIOR WEST, AND
THIS IS THE FAVORED SOLUTION AT THIS TIME. FARTHER NORTHWEST, SLOWLY-BUILDING
MID-LEVEL HEIGHTS OVER AND NEAR EASTERN ALASKA, COMBINED WITH THE WEAKENING
TROUGH CLOSER TO THE ALEUTIANS, ENHANCES THE ODDS FOR WETTER THAN NORMAL
WEATHER ACROSS THE NORTHERN REACHES OF THE MAINLAND WHILE ANOMALOUSLY DRY
WEATHER IS FAVORED ALONG THE SOUTHERN TIER OF ALASKA NEAR THE LARGEST POSITIVE
500-HPA HEIGHT ANOMALIES. HOWEVER, AS IS THE CASE ACROSS THE CONUS, GUIDANCE IS
NEITHER ROBUST NOR IN PARTICULARLY GOOD AGREEMENT.
THE OFFICIAL 8-14 DAY 500-HPA HEIGHT BLEND CONSISTS OF: 50% OF TODAY'S 6Z GFS
ENSEMBLE MEAN CENTERED ON DAY 11, 20% OF TODAY'S 0Z EUROPEAN ENSEMBLE MEAN
CENTERED ON DAY 11, AND 30% OF TODAY'S 0Z CANADIAN ENSEMBLE MEAN CENTERED ON
DAY 11
FORECAST CONFIDENCE FOR THE 8-14 DAY PERIOD: BELOW AVERAGE, 2 OUT OF 5, DUE TO
FAIR MODEL AGREEMENT AND CONTINUITY ON THE LONGWAVE PATTERN, BUT WITH
UNCERTAINTIES INTRODUCED BY EXPECTED CHANGES IN THE 500-HPA PATTERN LATER
WEEK-2, ALONG WITH CONTINUED INCONSISTENCY AMONG THE TOOLS FORECASTING SENSIBLE
WEATHER.
FORECASTER: RICH TINKER
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
AUGUST 17.
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:
20090720 - 19540809 - 20090820 - 20070823 - 19540802
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:
20090719 - 20070822 - 20090821 - 19540807 - 19540802
6-10 DAY OUTLOOK TABLE
OUTLOOK FOR AUG 15 - 19 2023
STATE TEMP PCPN STATE TEMP PCPN STATE TEMP PCPN
WASHINGTON A B OREGON A N NRN CALIF A N
SRN CALIF A N IDAHO A N NEVADA A N
W MONTANA N A E MONTANA B A WYOMING N A
UTAH A N ARIZONA A N COLORADO A N
NEW MEXICO A N N DAKOTA B A S DAKOTA N A
NEBRASKA A N KANSAS A N OKLAHOMA A N
N TEXAS A B S TEXAS A N W TEXAS A N
MINNESOTA N A IOWA N N MISSOURI A N
ARKANSAS A N LOUISIANA A B WISCONSIN N A
ILLINOIS A N MISSISSIPPI A B MICHIGAN A A
INDIANA A N OHIO A N KENTUCKY A N
TENNESSEE A N ALABAMA A B NEW YORK A A
VERMONT A A NEW HAMP A A MAINE A A
MASS A A CONN A A RHODE IS A A
PENN A N NEW JERSEY A N W VIRGINIA A N
MARYLAND A N DELAWARE A N VIRGINIA A N
N CAROLINA A N S CAROLINA A N GEORGIA A N
FL PNHDL A N FL PENIN A N AK N SLOPE N A
AK ALEUTIAN N N AK WESTERN N A AK INT BSN N A
AK S INT N A AK SO COAST N A AK PNHDL A N
8-14 DAY OUTLOOK TABLE
OUTLOOK FOR AUG 17 - 23 2023
STATE TEMP PCPN STATE TEMP PCPN STATE TEMP PCPN
WASHINGTON A N OREGON A N NRN CALIF A N
SRN CALIF A N IDAHO N N NEVADA A N
W MONTANA B N E MONTANA B N WYOMING N N
UTAH A N ARIZONA A N COLORADO A N
NEW MEXICO A N N DAKOTA B N S DAKOTA N N
NEBRASKA A N KANSAS A N OKLAHOMA A B
N TEXAS A B S TEXAS A B W TEXAS A B
MINNESOTA N N IOWA A N MISSOURI A N
ARKANSAS A N LOUISIANA A N WISCONSIN A A
ILLINOIS A N MISSISSIPPI A B MICHIGAN A N
INDIANA A N OHIO A N KENTUCKY A N
TENNESSEE A N ALABAMA A B NEW YORK A N
VERMONT A A NEW HAMP A A MAINE A A
MASS A N CONN A N RHODE IS A N
PENN A N NEW JERSEY A N W VIRGINIA A N
MARYLAND A N DELAWARE A N VIRGINIA A N
N CAROLINA A N S CAROLINA A N GEORGIA A N
FL PNHDL A N FL PENIN A N AK N SLOPE A A
AK ALEUTIAN N N AK WESTERN N N AK INT BSN A A
AK S INT A N AK SO COAST A B AK PNHDL A 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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