Weather Acronyms: X's

X Cross
XBT Abbreviation for expendable bathythermograph
XCP Except
XNG Crossing
XPC Expect
XPCD Expected
XPCG Expecting
XPCS Expects
XPLOS Explosive
XS Atmospherics
XTND Extend
XTNDD Extended
XTNDG Extending
XTRM Extreme
XTRMLY Extremely