The symptom includes pale face, cold moist limbs, cold sweat, dizziness, nausea, rapid heartbeat, weak pulse, shallow breath, unconscious, etc. These symptoms may appear before or during the coma.

常见面色苍白、四肢湿冷、出冷汗、头晕、恶心、心跳急速、脉搏细弱、呼吸表浅甚至昏迷不醒等症状，这些症状可能发生在昏厥之前或当中。

youdao

Meteorologists were blaming the nor'easter on the collision of two storm systems: cold air traveling south from Canada bumping into a moist low pressure system heading north from the Carolinas.

WSJ: Major Blizzard Bears Down on Northeast

Tornadoes are most likely when exceptionally cold, dry air plunges south to violently clash with warm, moist air originating in the Gulf of Mexico.

FORBES: Alarmists Offer A Perfect Global Warming Challenge