NOUS41 KWBC 061725

PNSWSH



Service Change Notice 26-42

National Weather Service Headquarters Silver Spring MD

125 PM EDT Wed May 6, 2026



To:	 Subscribers:

	 -NOAA Weather Wire Service

	 -Emergency Managers Weather Information Network

	 -NOAAPort

	 Other NWS Partners, Users and Employees



From:	 Kathryn Gilbert, Deputy Director

	 Weather Prediction Center



Subject: Changes to the Selected Cities and National High/Low

Temperature Products Effective on or about July 22, 2026



Effective on or about July 22, 2026, the National Weather

Service (NWS) will separate the National High/Low (Hi/Lo)

product from the Selected Cities (SCS) product to better align

issuance of the National Hi/Lo product with the extreme

temperatures recorded in the past day.



The SCS is a four page text product that reports weather from

the previous day and provides a two-day forecast for numerous

cities across the United States.  The SCS is issued two times a

day, at 0100 and 1300 UTC.  Currently, the last page of the SCS

(SCS04) also provides the extreme temperature (high and low)

across the contiguous United States (CONUS) recorded in the past

day, which is retrieved from the National Hi/Lo product.  The

National Hi/Lo section on the SCS04 will be replaced with a

permanent web link to the National Hi/Lo product.



The issuance times for the National Hi/Lo product will

transition from four times a day at 0050, 0650, 1250, and 1850

UTC to two times a day at 0230 and 1800 UTC.  The changes in

issuance time will provide additional time to capture possible

high and/or low temperature extremes from the Western United

States and provide better quality extreme temperature data for

the product. The 0230 UTC issuance includes preliminary low and

high temperatures for the calendar day (based on local time),

while the 1800 UTC issuance serves as the final update for the

previous calendar day’s low and high temperatures.

The Selected Cities product is in four pages and available at:

https://forecast.weather.gov/product.php?site=NWS&product=SCS&is

suedby=01

https://forecast.weather.gov/product.php?site=NWS&product=SCS&is

suedby=02

https://forecast.weather.gov/product.php?site=NWS&product=SCS&is

suedby=03

https://forecast.weather.gov/product.php?site=NWS&product=SCS&is

suedby=04



Currently, the National High and Low Temperature product is

available at:

https://www.wpc.ncep.noaa.gov/discussions/hpcdiscussions.php?dis

c=nathilo



Once the change is implemented, the new page will be available

at: https://www.wpc.ncep.noaa.gov/national_highlow/index.php



Products to be separated:



Product Name		    AWIPS ID		    WMO Heading

----------------	    --------		    -----------

Selected Cities 	    SCS01,02,03,04	    FPUS20 KWBN

			    XF03DY		    RXUS30 KWBN

National High/Low	    XTEUS		    RXUS30 KWNH



If you have questions regarding these changes, please contact:



Zack Taylor

Weather Integration and Analysis Section Chief

NWS Weather Prediction Center

College Park, MD

zack.taylor@noaa.gov



National Service Change Notices are available at:



https://www.weather.gov/notification/