EXAMPLE OF SIGMET FOR RADIOACTIVE CLOUD
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YUCC SIGMET RO2 VALID 201200/201600 YUDO —
YUCC AMSWELL FIR RDOACT CLD OBS AT 1155Z
WI 30KM OF N6030 E02550 SFC/FL550 STNR Meaning: The second radioactive cloud SIGMET issued
for the AMSWELL* flight information region (identified by YUCC Amswell area
control centre) by the Donlon/International* meteorological watch office
(YUDO) since 0001 UTC; the SIGMET is valid from 12.00 UTC to 16.00 UTC
on the 20th of the month; radioactive cloud was observed at 1155
UTC within 30 kilometres of 60 degrees 30 minutes north 25 degrees 50
minutes east between the surface and flight level 550. The radioactive cloud
is stationary. * Fictitious
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