Clive Sharp, the man who murdered Irish vet Catherine Gowing, was jailed for life at Mold Crown Court and ordered to serve a minimum of 37 years behind bars before he can be considered for parole.
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The storms that struck Texas and Oklahoma late on Tuesday brought tornadoes, tennis ball-sized hail and powerful winds.
Samantha Baldwin, 42, and her sons Louis Madge, nine, and Dylan Madge, six, haven't been seen for two days.
A spokesman for the UK Coastguard said it was coordinating a search operation in the Caernarfon Bay area of North Wales.