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===HURCON/TCCOR===
{{Main|HURCON}}
The [[United States Department of Defense]] uses a multi-stage system called the Hurricane Condition (HURCON) in the North Atlantic and the Northeast Pacific and the Tropical Cyclone Condition of Readiness (TCCOR) in the western Pacific to prepare bases and evacuate assets and personnel in advance of adverse weather associated with tropical cyclones.<ref name="TCCOR">{{cite journal|title=Objective Guidance for Use in Setting Tropical Cyclone Conditions of Readiness|author1=Sampson, Charles R|journal=Weather and Forecasting|author2=Schumacher, Andrea B|author3=Knaff, John A|author4=DeMaria, Mark|author5=Fukada, Edward M|author6=Sisko, Chris A|author7=Roberts, David P|author8=Winters, Katherine A|author9=Wilson, Harold M|year=2012|volume=27|issue=4|pages=1052–1060|doi=10.1175/WAF-D-12-00008.1|bibcode=2012WtFor..27.1052S|doi-access=free}}</ref>
The alerts are recommended by weather facilities either on base or by central sites like the [[National Hurricane Center]] or the [[Joint Typhoon Warning Center]] and are generally related to the timing and potential for destructive sustained windspeeds of above {{convert|50|kn|mph km/h|abbr=on}}.<ref name="TCCOR"/> Recommendations are then considered by base or area commanders along with other subjective factors for setting the alert status like assets, holidays or the bases experience in emergency preparedness.<ref name="TCCOR"/> The bases prefer to set these alerts sequentially, from HURCON or TCCOR 5 with destructive winds expected within 96 hours, through levels 4, 3, 2 and if needed to a series of four different level 1 conditions, however depending on the cyclone's movement or location some of these signals can be skipped.<ref name="TCCOR"/><ref>{{cite web|url=http://www.usno.navy.mil/NOOC/fwc-n/RSS/pdf/TC_QRG_2013.pdf|title=Tropical Cyclone Quick Reference Guide 2013|publisher=United States Navy|date=February 8, 2013|access-date=December 15, 2013|author=Fleet Weather Center|page=2}}</ref> After a system passes and stops affecting the base, the authorities can decide to revert to the lowest level or stay in a heightened approach if another tropical cyclone is approaching.<ref name="TCCOR"/>
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