Extreme wind warning

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In National Weather Service (NWS) terminology, an extreme wind warning (EWW) is a warning issued when a landfalling hurricane or a derecho is expected to bring winds of 100 knots (115 mph, 185 km/h, 51 m/s) or above to a specific location. The warning is issued just prior to when the strongest winds of the eyewall are expected to impact an area.[1]

The warning is to be issued for the smallest area possible, and be valid for times of two hours or less, though some warnings have been issued for three hours.[1] It was developed in response to confusion resulting from the landfall of Hurricane Katrina. NWS offices in Jackson and New Orleans/Baton Rouge issued 11 tornado warnings for areas that would not experience an actual tornado, but would experience extreme wind speeds commonly associated with tornadoes.[2] The extreme wind warning is now expected to be used in these situations.

Examples[edit]

This Extreme Wind Warning was issued by the National Weather Service in Melbourne during the passage of Hurricane Matthew.

Extreme Wind Warning #1 - National Weather Service - Melbourne, FL
BULLETIN - EAS ACTIVATION REQUESTED
EXTREME WIND WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
526 AM EDT FRI OCT 7 2016

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* EXTREME WIND WARNING FOR...
  NORTHEASTERN BREVARD COUNTY IN FLORIDA...

* UNTIL 715 AM EDT

* AT 521 AM EDT...SURFACE OBSERVATIONS AND DOPPLER RADAR INDICATED
EXTREME WINDS... ASSOCIATED WITH THE EYEWALL OF HURRICANE MATTHEW
WERE ABOUT TO MOVE ONSHORE CAPE CANAVERAL INCLUDING PORT CANAVERAL
AND MOVING NORTH-NORTHWEST AT 15 MPH. THIS IS AN EXTREMELY
DANGEROUS AND LIFE-THREATENING SITUATION!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT DESTRUCTIVE WIND GUSTS TO AROUND 115 MPH WILL SPREAD ACROSS
THE CAPE CANAVERAL AREA...PRODUCING SWATHS OF TORNADO-LIKE DAMAGE.
A WIND GUST OF 100 MPH WAS RECENTLY RECORDED AT THE TIP OF CAPE
CANAVERAL.

This Extreme Wind Warning was issued by the National Weather Service in Corpus Christi in association with Hurricane Harvey prior to landfall.

Extreme Wind Warning #2 - National Weather Service - Corpus Christi, TX
BULLETIN - EAS ACTIVATION REQUESTED
Extreme Wind Warning
National Weather Service Corpus Christi TX
456 PM CDT FRI AUG 25 2017

The National Weather Service in Corpus Christi has issued a

* Extreme Wind Warning for...
  Southwestern Calhoun County in south Texas...
  Aransas County in south central Texas...
  East central Nueces County in south central Texas...
  Eastern San Patricio County in south central Texas...
  Central Refugio County in south central Texas...

* Until 700 PM CDT

* At 454 PM CDT, National Weather Service Doppler radar indicated
  extreme winds, associated with the eyewall of Hurricane Harvey,
  were moving onshore 17 miles east of Key Allegro, or 18 miles east
  of Rockport, moving northwest at 25 mph. This is an extremely
  dangerous and life-threatening situation!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Widespread destructive winds of 115 to 145 mph will spread across
Calhoun County,  Aransas County,  Nueces County,  San Patricio
County,  Refugio County, producing swaths of tornado-like damage.

TAKE COVER NOW! Treat these imminent extreme winds as if a tornado
was approaching and move immediately to the safe room in your
shelter. Take action now to protect your life!

This Extreme Wind Warning was issued by the National Weather Service in San Juan, Puerto Rico in association with Hurricane Irma.

Extreme Wind Warning #3 - National Weather Service - San Juan, PR
BULLETIN - EAS ACTIVATION REQUESTED
Extreme Wind Warning
National Weather Service San Juan PR
1116 AM AST WED SEP 6 2017

The National Weather Service in San Juan has issued a

* Extreme Wind Warning for...
  Saint John in Virgin Islands...
  Saint Thomas in Virgin Islands...

* Until 115 PM AST

* At 1114 AM AST, National Weather Service Doppler radar indicated
  extreme winds, associated with the eyewall of Major Hurricane
  Irma, about to move over St John, moving west at 20 mph. This
  extreme winds will affect St John and St Thomas through 100 PM
  AST. This is an extremely dangerous and life-threatening situation!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Treat these imminent extreme winds as if a tornado
was approaching and move immediately to the safe room in your
shelter. Take action now to protect your life!

The safest place to be during a major landfalling hurricane is in a
reinforced interior room away from windows. Get under a table or
other piece of sturdy furniture. Use mattresses, blankets or pillows
to cover your head and body. Remain in place through the passage of
these life-threatening conditions.

This Extreme Wind Warning was issued by the National Weather Service in San Juan in association with Hurricane Maria prior to landfall.

Extreme Wind Warning #4 - National Weather Service - San Juan, PR
BULLETIN - EAS ACTIVATION REQUESTED
Extreme Wind Warning
National Weather Service San Juan PR
538 AM AST WED SEP 20 2017

The National Weather Service in San Juan has issued a

* Extreme Wind Warning for...
  Trujillo Alto Municipality in Puerto Rico...
  Rio Grande Municipality in Puerto Rico...
  San Juan Municipality in Puerto Rico...
  Aguas Buenas Municipality in Puerto Rico...
  Carolina Municipality in Puerto Rico...
  Canovanas Municipality in Puerto Rico...
  Guaynabo Municipality in Puerto Rico...
  Bayamon Municipality in Puerto Rico...
  Cidra Municipality in Puerto Rico...

* Until 700 AM AST

* At 533 AM AST, National Weather Service Doppler radar indicated
  extreme winds, associated with the eyewall of Major Hurricane
  Maria already moving onshore and will quickly impact Rio Grande,
  Canovanas, Aguas Buenas, Cidra and the San Juan Metro Area within
  the next hour. This is an extremely dangerous and life-threatening
  situation!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move immediately to the safe room in your shelter.
Take action now to protect your life!

The safest place to be during a major landfalling hurricane is in a
reinforced interior room away from windows. Get under a table or
other piece of sturdy furniture. Use mattresses, blankets or pillows
to cover your head and body. Remain in place through the passage of
these life-threatening conditions.

See also[edit]

References[edit]

  1. ^ a b National Weather Service. "Product Description Document: Extreme Wind Warning (EWW)" (PDF). Retrieved 2007-10-04. 
  2. ^ U.S. Department of Commerce. "Service Assessment. Hurricane Katrina: August 23–31, 2005" (PDF). Archived from the original (PDF) on 2007-07-11. Retrieved 2007-10-04. 

 This article incorporates public domain material from this U.S government document.