A major air and sea search operation is underway near Fishguard, Pembrokeshire, amid reports that a plane may have crashed.
Residents in Trefin reported two fast jets flying low overhead just after 7pm. There were also reports of a loud blast moments later.
A rescue helicopter from RAF Chivenor in addition to two all-weather RNLI lifeboats have been called by Milford Haven coastguards.
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Some locally heavy showers are possible overnight, particularly in the east, where some thundery downpours are possible.
Wayne Pivac praised Scarlets' attacking style as they secured the Guinness PRO12 title with a stunning 46-22 success against Munster.
Scarlets sealed a famous victory at the Aviva Stadium in Dublin with an emphatic 46-22 victory over Munster in the Guiness PRO12 final.