From the April 23, 2008 ARRL ARES E-Letter:

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The VoIP SKYWARN and Hurricane Net operates by combining both the Echolink and IRLP linked repeater networks, while handling critical wide area communications during major severe weather and tropical events.

These operations have gained national stature in recent years, and provide excellent service. Whenever tropical weather is imposing a threat to the U.S. mainland and certain other areas of interest, the VoIP WX-NET will be fully operational. See <http://www.voipwx.net/>.