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Amateur Radio weather watchers on alert as record-setting hurricane heads toward US

October 19, 2005 -- The Hurricane Watch Net (HWN) and SKYWARN are keeping an eye on Hurricane Wilma as it threatens a possible landfall this weekend on the South Florida coast. (see full size image) As of midweek, the HWN was still mulling its activation options. The net operates on 14.325 MHz. Early today over the warm waters of the Caribbean, Wilma amped up from a Category 2 to the most intense Category 5 hurricane on record, and the National Hurricane Center (NHC)--home of WX4NHC, which works in cooperation with the HWN to gather ground-level weather data for forecasters--now is calling Wilma "potentially catastrophic." A mandatory evacuation of all visitors and nonresidents was in effect as of noon today EDT for the Florida Keys of Monroe County, including the Dry Tortugas. Hurricanes are measured by factors such as atmospheric pressure, winds and storm surge. Wilma's atmospheric pressure at 1200 UTC measured 882 millibars, topping the previous record of 888 millibars set in 1988 by Hurricane Gilbert. As of 1800 UTC, Wilma was producing maximum sustained winds near 165 MPH with higher gusts. It was some 300 miles southeast of Cozumel, Mexico, moving west-northwesterly near 7 MPH.