Just came across this sigmet today:
WSJP31 RJTD 030330 RJJJ SIGMET A01 VALID 030330/030730 RJTD- RJJJ FUKUOKA FIR RDOACT CLD FCST WI N3718 E14052 - N3714 E14102 - N3718 E14112 - N3725 E14115 - N3733 E14112 - N3736 E14102 - N3733 E14052 - N3725 E14048 - N3718 E14052 STNR INTST UNKNOWN=
Yup, that’s right: Radioactive Cloud. Stay away! It’s also being depicted on the SIGWX charts for the region:
Interestingly, yesterday Nav Canada was doing quite a few tests of their systems. They issued test sigmets and test volcanic ash sigmets:
WVCN34 CWUL 022104 SIGMET A1 VALID 022105/030105 CWUL- WTN AREA BOUNDED BY /5819N06313W/20 W SAGLEK - /5819N06545W/100 W SAGLEK - /5719N06429W/85 SW SAGLEK - /5819N06313W/20 W SAGLEK. TEST TEST THIS IS A TEST. VOLCANIC ASH FCST 200/300. WRANGELL VOLCANO 6200N14410W ERUPTED AT 281200Z. ASH QS AND DSIPTG NXT 2 HR. TEST TEST THIS IS A TEST. END/GFA34/JB/EH/CMAC-W
WSCN02 CWUL 021755 CZQX SIGMET W1 CANCELLED AT 021755 CWUL- GANDER OCEANIC FIR. TEST...TEST...TEST. END/GANDER OCEANIC/CMAC-E/FDION
Hopefully the tests passed ;)