570   
NOUS41 KWBC 151730  
PNSWSH  
  
SERVICE CHANGE NOTICE 25-52  
NATIONAL WEATHER SERVICE HEADQUARTERS SILVER SPRING MD  
130 PM EDT TUE JUL 15 2025  
  
TO: SUBSCRIBERS  
 -NOAA WEATHER WIRE SERVICE  
 -EMERGENCY MANAGERS WEATHER INFORMATION NETWORK  
 -NOAAPORT  
 OTHER NWS PARTNERS, USERS AND EMPLOYEES  
  
FROM: KEVIN STONE, CHIEF  
 AVIATION AND SPACE WEATHER SERVICES BRANCH  
  
SUBJECT: UPGRADES TO THE ALASKA AVIATION WEATHER UNIT WINDS  
ALOFT AND HOURLY OBSERVATION CHARTS ON OR AFTER AUGUST 14, 2025.  
  
ON OR AFTER AUGUST 14, 2025, THE ALASKA AVIATION WEATHER UNIT IS  
PLANNING TO PERFORM AN UPGRADE TO THEIR WINDS ALOFT AND HOURLY  
OBSERVATION CHARTS. THIS UPGRADE WILL PROVIDE USERS IN ALASKA  
WITH ADDITIONAL INFORMATION THROUGH HIGHER RESOLUTION DATA, AND  
ALLOW THE NWS TO RETIRE THE END OF LIFE SYSTEM USED TO PRODUCE  
THEM.  
  
USERS ACCESSING THESE CHARTS THROUGH THE ALASKA AVIATION WEATHER  
UNIT WEBSITE WILL AUTOMATICALLY SEE THE UPGRADED CHARTS ON THE  
FOLLOWING WEBSITES:  
ALASKA HOURLY OBSERVATIONS:HTTPS://WWW.WEATHER.GOV/AAWU/HRLYOBS  
WINDS ALOFT: HTTPS://WWW.WEATHER.GOV/AAWU/UPPERWINDS  
  
TO PREPARE FOR THIS CHANGE, USERS UTILIZING A STATIC URL TO  
AUTOMATICALLY DOWNLOAD THESE CHARTS WILL NEED TO MAKE THE  
FOLLOWING URL UPDATES ON THEIR SYSTEMS:  
  
CURRENT HOURLY OBSERVATION URLS:  
- ALASKA:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_AK12.GIF  
- SOUTHEAST:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_SEAK5.GI  
F  
- NORTH GULF:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_NGLF5.GI  
F  
- SOUTHCENTRAL:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_SCNT5.GI  
F  
- SOUTHWEST:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_SWAK6.GI  
F  
- WESTERN:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_WCEN5.GI  
F  
- CENTRAL:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_CENT5.GI  
F  
- NORTHERN:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_NOAK6.GI  
F  
  
NEW HOURLY OBSERVATION URLS:  
- ALASKA:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_AK12.PNG  
- SOUTHEAST:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_SEAK5.PN  
G  
- NORTH GULF:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_NGLF5.PN  
G  
- SOUTHCENTRAL:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_SCNT5.PN  
G  
- SOUTHWEST:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_SWAK6.PN  
G  
- WESTERN:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_WCEN5.PN  
G  
- CENTRAL:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_CENT5.PN  
G  
- NORTHERN:  
HTTP://WWW.WEATHER.GOV/IMAGES/AAWU/HOURLYCHARTS/FAA_AWU_NOAK6.PN  
G  
  
CURRENT WINDS ALOFT (6-HOUR FORECAST):  
- 6,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_6K_6H.GIF  
- 9,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_9K_6H.GIF  
- 12,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_12K_6H.GIF  
- 18,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_18K_6H.GIF  
- 24,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_24K_6H.GIF  
- 30,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_30K_6H.GIF  
  
CURRENT WINDS ALOFT (12-HOUR FORECAST):  
- 6,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_6K_12H.GIF  
- 9,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_9K_12H.GIF  
- 12,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_12K_12H.GIF  
- 18,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_18K_12H.GIF  
- 24,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_24K_12H.GIF  
- 30,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_30K_12H.GIF  
  
NEW WINDS ALOFT (3-HOUR FORECAST):  
- 3,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT030_1.PNG  
- 6,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT060_1.PNG  
- 9,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT090_1.PNG  
- 12,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT120_1.PNG  
- 15,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT150_1.PNG  
- 18,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT180_1.PNG  
- 21,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT210_1.PNG  
- 24,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT240_1.PNG  
- 27,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT270_1.PNG  
- 30,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT300_1.PNG  
- 34,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT340_1.PNG  
- 39,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT390_1.PNG  
- 44,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT440_1.PNG  
- 52,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT520_1.PNG  
  
NEW WINDS ALOFT (9 HOUR FORECAST):  
- 3,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT030_3.PNG  
- 6,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT060_3.PNG  
- 9,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT090_3.PNG  
- 12,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT120_3.PNG  
- 15,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT150_3.PNG  
- 18,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT180_3.PNG  
- 21,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT210_3.PNG  
- 24,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT240_3.PNG  
- 27,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT270_3.PNG  
- 30,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT300_3.PNG  
- 34,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT340_3.PNG  
- 39,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT390_3.PNG  
- 44,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT440_3.PNG  
- 52,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT520_3.PNG  
  
NEW WINDS ALOFT (15 HOUR FORECAST):  
- 3,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT030_5.PNG  
- 6,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT060_5.PNG  
- 9,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT090_5.PNG  
- 12,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT120_5.PNG  
- 15,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT150_5.PNG  
- 18,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT180_5.PNG  
- 21,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT210_5.PNG  
- 24,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT240_5.PNG  
- 27,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT270_5.PNG  
- 30,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT300_5.PNG  
- 34,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT340_5.PNG  
- 39,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT390_5.PNG  
- 44,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT440_5.PNG  
- 52,000 FT WIND:  
HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/WIND_FLT520_5.PNG  
  
ADDITIONALLY, AS PART OF THIS CHANGE THE FOLLOWING GEOPOTENTIAL  
HEIGHTS/WINDS GRAPHICS WILL BE RETIRED:  
 HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/ANALYSIS_850.GIF  
 HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/ANALYSIS_700.GIF  
 HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/ANALYSIS_500.GIF  
 HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/ANALYSIS_300.GIF  
 HTTPS://WWW.WEATHER.GOV/IMAGES/AAWU/ANALYSIS_200.GIF  
  
ADDITIONAL HOURLY OBSERVATION AND WINDS ALOFT FORECASTS WILL  
ALSO BE AVAILABLE ON AN INTERACTIVE MAP AT  
AVIATIONWEATHER.GOV/GFA.  
  
IF YOU HAVE ANY QUESTIONS CONCERNING ALASKA AVIATION WEATHER  
UNIT WINDS ALOFT AND HOURLY OBSERVATION CHARTS, PLEASE CONTACT:  
  
DAVID KOCHEVAR  
WARNING COORDINATION METEOROLOGIST  
NATIONAL WEATHER SERVICE  
ALASKA AVIATION WEATHER UNIT  
(907) 266-5190  
DAVID.KOCHEVAR@NOAA.GOV  
  
NATIONAL SERVICE CHANGE NOTICES ARE ONLINE AT:  
  
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/  
 
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