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690
NOUS41 KWBC 151848 AMD
PNSWSH
PUBLIC INFO STATEMENT...SERVICE CHANGE NOTICE 00-53...AMENDED
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
240 PM EDT THU JUN 15 2000
...AMENDED NOTICE TO CHANGE THE EFFECTIVE DATE TO OCTOBER 2 2000
INSTEAD OF JULY 5 2000...
TO: NATIONAL WEATHER SERVICE /NWS/ EMPLOYEES...NOAAPORT
SUBSCRIBERS...FAMILY OF SERVICES SUBSCRIBERS...NOAA
WEATHER WIRE SERVICE SUBSCRIBERS... DIFAX
SUBSCRIBERS...AND OTHER NWS CUSTOMERS
FROM: ROBERT E. LIVEZEY
CHIEF...CLIMATE SERVICES DIVISION
SUBJECT: ENHANCEMENTS TO THE NATIONAL 6- TO 10-DAY OUTLOOK
ISSUED BY THE CLIMATE PREDICTION CENTER...EFFECTIVE
MONDAY OCTOBER 2 2000
...AMENDED NOTICE TO CHANGE THE EFFECTIVE DATE TO OCTOBER 2 2000
INSTEAD OF JULY 5 2000...
ON MONDAY OCTOBER 2 2000...THE CLIMATE PREDICTION CENTER /CPC/
WILL INCREASE THE FREQUENCY OF ISSUANCE OF THE NATIONAL 6- TO 10-
DAY OUTLOOK TO DAILY ... FROM THE CURRENT MONDAY...WEDNESDAY...
AND FRIDAY. THE ISSUANCE TIME OF DAY WILL REMAIN AROUND 4:00 PM
EASTERN LOCAL TIME.
ALSO...THE OUTLOOK WILL BE EXPRESSED IN A 3-CATEGORY...
PROBABILISTIC FORMAT . I.E... THE TEMPERATURE AND PRECIPITATION
OUTLOOKS WILL BE EXPRESSED AS PROBABILITIES THAT THE AVERAGE
TEMPERATURE OR TOTAL PRECIPITATION FOR THE PERIOD WILL FALL INTO
THE MOST LIKELY OF THREE CLASSES: ABOVE... BELOW...OR NEAR
NORMAL. THE CLASSES ARE DEFINED AS CLIMATOLOGICALLY EQUALLY
LIKELY: THE TOP 10 CASES OF A THIRTY YEAR (1961-1990) RECORD
DEFINE THE ABOVE CATEGORY (A)...THE MIDDLE 10 CASES DEFINE THE
NORMAL CATEGORY (N)...AND THE BOTTOM 10 CASES DEFINING THE BELOW
CATEGORY (B) AT EACH LOCATION.
THE PROBABILITIES FOR THE MOST LIKELY CLASS WILL BE GIVEN IN
SOLID CONTOUR LINES. CENTERS OF MAXIMUM PROBABILITY WILL BE
LABELED WITH THE LETTERS A...N... OR B TO DENOTE THE MOST LIKELY
CLASS. FOR EXAMPLE: IF THE PROBABILITY FOR THE ABOVE AVERAGE
TEMPERATURE CLASS EXCEEDS 40 PERCENT FOR A GIVEN AREA AND IS THE
MOST LIKELY CLASS...THEN THE AREA WILL BE ENCIRCLED BY A
PROBABILITY CONTOUR OF 40 PERCENT ON THE TEMPERATURE OUTLOOK
CHART AND BE LABELED WITH THE LETTER A.
THE TEMPERATURE CHART WILL CONTINUE TO HAVE DASHED ISOTHERMS OF
THE CLIMATOLOGICAL AVERAGE NORMAL TEMPERATURES FOR THE PERIOD.
THE PRECIPITATION CHART WILL CONTINUE TO HAVE DASHED ISOYHETS OF
CLIMATOLOGICAL NORMAL TOTAL PRECIPITATION FOR THE PERIOD.
THE CHARTS AFFECTED ARE AS FOLLOWS:
AWIPS ID WMO HEADING DIFAX OUTLOOK CHART TITLE
RBG96E PEIY47 KWBC D046 6- TO 10-DAY TOTAL PRECIPITATION
RBG96T PTIY51 KWBC D046 6- TO 10-DAY TEMPERATURE ANOMALY
NOTE...DIFAX CHART D046 IS A 2-PANEL CHART FOR BOTH PRECIPITATION
AND TEMPERATURE.
THE CHARTS WILL ALSO BE AVAILABLE ON THE INTERNET AT CPC/S WEB
SITE AT INTERNET SITE - WWW.CPC.NCEP.NOAA.GOV - USE LOWER CASE
http://www.cpc.ncep.noaa.gov
THE NARRATIVE OUTLOOK DESCRIPTION (NMCEONUS - FEUS40 KWBC) WILL
BE DISCONTINUED...BUT THE PROGNOSTIC DISCUSSION (NMCPMDMRD
- FXUS06 KWBC) WILL BE ISSUED MONDAY THROUGH FRIDAY CONCURRENTLY
WITH THE OUTLOOK. THE DISCUSSION WILL INCLUDE A TABLE LISTING OF
THE MOST LIKELY OF THE THREE CLIMATOLOGICAL CLASSES BY STATE OR
STATE SUBREGION.
FOR FURTHER INFORMATION...CONTACT
NOAA/NWS
CLIMATE PREDICTION CENTER - W/NP51
5200 AUTH RD.
CAMP SPRINGS MD 20746-4304
OR E-MAIL CPC THROUGH THEIR WEB SITE.
THIS AND OTHER NOTIFICATIONS ARE ON THE INTERNET AT:
WWW.CPC.NCEP.NOAA.GOV /USE LOWER CASE/
http://www.cpc.ncep.noaa.gov
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