Preparing for tornadoes

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Tornado damageHurricanes can also produce tornadoes that add to the storm’s destructive power. Tornadoes are most likely to occur in the right-front quadrant of the hurricane.  However, they are also often found elsewhere embedded in the rainbands, well away from the center of the hurricane.

Some hurricanes seem to produce no tornadoes, while others develop multiple ones. Studies have shown that more than half of the landfalling hurricanes produce at least one tornado; Hurricane Buelah (1967) spawned 141 according to one study. In general, tornadoes associated with hurricanes are less intense than those that occur in the Great Plains (see the Enhanced Fujita Intensity Scale from the Storm Prediction Center’s website). Nonetheless, the effects of tornadoes, added to the larger area of hurricane-force winds, can produce substantial damage.
We have no way at present to predict exactly which storms will spawn tornadoes or where they will touch down. The new Doppler radar systems have greatly improved the forecaster’s warning capability, but the technology usually provides lead times from only a few minutes up to about 30 minutes. Consequently, preparedness is critical.

Tornado Facts

  • When associated with hurricanes, tornadoes are not usually accompanied by hail or a lot of lightning, clues that citizens in other parts of the country watch for.
  • Tornado production can occur for days after landfall when the tropical cyclone remnants maintain an identifiable low pressure circulation.
  • They can also develop at any time of the day or night during landfall. However, by 12 hours after landfall, tornadoes tend to occur mainly during daytime hours.

Fujita scale
The original Fujita scale (F-scale) was replaced with the Enhanced Fujita scale on February 1, 2007. The Enhanced F-scale still is a set of wind estimates (not measurements) based on damage. It uses three-second gusts estimated at the point of damage based on a judgment of 8 levels of damage to 28 indicators. These estimates vary with height and exposure. Important note: The 3 second gust is not the same wind as in standard surface observations. Standard measurements are taken by weather stations in open exposures, using a directly measured, “one minute mile” speed. The scale uses actual damage to determine a tornado’s wind speed.

Visit the Storm Prediction’s Center website to view the new Enhanced Fujita scale.

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Preparing for a Weather Disaster

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Family Disaster Plan

check markDiscuss the type of hazards that could affect your family. Know your home’s vulnerability to storm surgeflooding and wind.
check markLocate a safe room or the safest areas in your home for each hurricane hazard. In certain circumstances the safest areas may not be your home but within your community.
check markDetermine escape routes from your home and places to meet. These should be measured in tens of miles rather than hundreds of miles.
check markHave an out-of-state friend as a family contact, so all your family members have a single point of contact.
check markMake a plan now for what to do with your pets if you need to evacuate.
check markPost emergency telephone numbers by your phones and make sure your children know how and when to call 911.
check markCheck your insurance coverage – flood damage is not usually covered by homeowners insurance.
check markStock non-perishable emergency supplies and a Disaster Supply Kit.
check markUse a NOAA weather radio. Remember to replace its battery every 6 months, as you do with your smoke detectors.
check markTake First Aid, CPR and disaster preparedness classes.

Disaster Supply Kit

Check boxWater - at least 1 gallon daily per person for 3 to 7 days
Check boxFood - at least enough for 3 to 7 days— non-perishable packaged or canned food / juices— foods for infants or the elderly— snack foods— non-electric can opener— cooking tools / fuel— paper plates / plastic utensils
Check boxBlankets / Pillows, etc.
Check boxClothing - seasonal / rain gear/ sturdy shoes
Check boxFirst Aid Kit / Medicines / Prescription Drugs
Check boxSpecial Items - for babies and the elderly
Check boxToiletries / Hygiene items / Moisture wipes
Check boxFlashlight / Batteries
Check boxRadio - Battery operated and NOAA weather radio
Check boxTelephones - Fully charged cell phone with extra battery and a traditional (not cordless) telephone set
Check boxCash (with some small bills) and Credit Cards - Banks and ATMs may not be available for extended periods
Check boxKeys
Check boxToys, Books and Games
Check boxImportant documents - in a waterproof container or watertight resealable plastic bag— insurance, medical records, bank account numbers, Social Security card, etc.
Check boxTools - keep a set with you during the storm
Check boxVehicle fuel tanks filled
Check boxPet care items— proper identification / immunization records / medications— ample supply of food and water— a carrier or cage
— muzzle and leash 

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