AN EXTREME WIND WARNING REMAINS IN EFFECT UNTIL 915 AM EDT FOR
LOWER KEYS IN MONROE COUNTY...
At 800 AM EDT, National Weather Service Doppler radar indicated
extreme winds, associated with the northern eyewall of Hurricane
Irma, were moving across and just north of the Lower Keys.
If you happen to be in the Lower Keys, it is very likely that
sensible weather conditions will diminish significantly...namely the
winds and rainfall. DO NOT BE FOOLED BY THIS. As Irma continues to
move northward, winds over the next hour will shift from the exact
opposite direction, and will likely do so very violently and with
little to no time to react.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Treat these imminent extreme winds as if a tornado was approaching
and stay in the safe room of your shelter. Continue to use whatever
you have to protect yourself from flying debris: pillows,
mattresses, blankets, helmets, etc.
DO NOT GO OUTSIDE. Remain sheltered in place and hunkered down.
This is an extremely dangerous and life-threatening situation!
This includes US 1 between mile markers 0 and 40.
A tornado watch remains in effect until noon EDT for Florida.
Source: https://www.google.org/publicalerts/alert?aid=321dbf92346fba0d&hl=en&source=sos
What is an Extreme Wind Warning?
Extreme Wind Warning (EWW) inform the public of the need to take immediate shelter in an interior portion of a well-built structure due to the onset of extreme tropical cyclone winds. An EWW for extreme tropical cyclone winds should be issued when both of the following criteria are met: a) Tropical cyclone is a category 3 or greater on the Saffir Simpson hurricane scale as designated by NHC, CPHC or JTWC. b) Sustained tropical cyclone surface winds of 100 knots (115 mph) or greater are occurring or are expected to occur in a WFO’s county warning area within one hour.
Source: http://w1.weather.gov/glossary/index.php?word=Extreme+Wind+Warning
http://edition.cnn.com/2017/09/09/us/hurricane-irma-florida-latest/index.html
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