Assertion: extratropical cyclone | /r/CapableOf | deepen on 14 and 15 december
Facets:
value: to below 920 millibars
type: OTHER
Source sentences:
text: On 14 and 15 December 1986, an extratropical cyclone near Iceland deepened to below 920 millibars (27 inHg), which is a pressure equivalent to a category 5 hurricane.