Ceiling UTC Wind Shear 
Pilot Institute
OCTOBER 17, 2024
YYGGgg : Date and time of issue in UTC (Zulu time). issued on the 6th at 15:55 UTC The Summary Section The summary includes a brief overview of the SIGMET, providing validity, affected regions, and sequence information. [n][n]n VALID YYGGgg/YYGGgg : The period the SIGMET is active, using UTC times. MOV N 30 KT).
Pilot Institute
NOVEMBER 5, 2024
Cloud ceilings below 1,500 feet or cumulonimbus clouds can trigger a SPECI. A sudden wind shift, a 10-knot or greater speed increase, a 45-degree or more direction change, or gusts exceeding limits may also cause a SPECI. Thunderstorms can also bring wind shear and lightning. 3/4SM : Visibility of ¾ statute miles.
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