Preparing for major storms makes all the difference. Some times it could mean the difference
between life and death. Tropical weather can be prepared for. And plans can be laid out well ahead of any
advisories. But to understand a
hurricane, you must know the basics first.
John Cole, a meteorologist with the National Weather Service in Newport
explains how hurricanes form…
Hurricanes develop from easterly waves in
general. About 100 come off the African
Coast, and 10% develop into tropical cyclones.
And that would be depressions, tropical storms, hurricanes, and so
basically a hurricane is a low pressure area in the atmosphere that rotates
counter-clock wise.
Around the
African coast is where we look at for tropical activity. Warm water temperatures especially around
this time of the year make conditions ripe for tropical weather that could very
well turn into a hurricane.
If the upper level conditions are right, that is if you have
very minimal sheering winds in the mid and upper levels of the atmosphere, you
can get updrafts within those thunderstorms and you can get a circulation that
develops because of a force known as the Coriolis force. So you get a low-pressure system developing,
first its weak. It’s a tropical
depression with winds up to 39 mph. And
then as it intensifies, it gets a more distinct rotary circulation, and the
winds increase to 39 to 73 mph. And
that’s when the National Hurricane Center in Miami names the systems. And then when it develops winds of 74 mph or
greater, then it’s a hurricane it’s categorized by the Saffir-Simpson
scale.
The
Saffir-Simpson scale is a 1-5 rating used to measure the intensity of a
hurricane. It’s used to give an estimate of the potential property damage and
flooding expected along the coast- from a hurricane landfall. A category 1 or 2 hurricane is generally
thought of as a fairly weak hurricane.
But Cole says that low number could be
misleading.
We had an impact from a category 2 hurricane, Isabelle, up
here in North Carolina, that had been a category 5 hurricane, and this
particular hurricane was very large. So
the impact on the water area was significant, with significant surge, and it
still had 100 mph sustained winds, so a category 2 hurricane can be very
significant.
No matter the size of a hurricane, Cole says
it’s always good to be prepared.
You need to prepare early in the season. And I would say one
of the main things is to have a disaster supplies kit already assembled prior to
the hurricane season. But it’s not too
late to do that now. But have enough
supplies. Enough water for 3-5 days,
enough food supplies, non-perishable foods for that same length of time, plenty
of medicine if you require that, have your car gassed up, you need to acquire
the cash well in advance because the ATM machines are going to go down, you
know, with the loss of electricity. Have
a plan of action. Know where your family
is going to go, know your evacuation routes, tell other family members or
friends where you are going, so they can keep track of you as well.
Cole says that everyone should have a designated
hurricane kit. In the kit, you’ll want
snacks, games for when the lights go out, flashlights, bug spray, fresh
batteries, and a radio—so you can keep track as Public Radio East provides
continuous storm coverage. The wind
that comes with hurricanes and tropical storms can cause a significant amount of damage. Since eastern North Carolina
is surrounded by large bodies of water, our geography makes us vulnerable to
storm surge. Storm surge occurs when water is pushed
toward the shore by the force of the winds swirling around the storm. John Cole considers storm
surge to be the main threat to coastal
areas.
We have a unique situation here in North Carolina,
where we do have to worry about surge along the sounds, as well, and water level
rises along the sounds. With Hurricane
Isabelle, level rises in Adams and Clubfoot Creek, Down East Carteret County,
Craven County, went to 10 to 11 feet, and we had a 6 to 8 foot storm surge on
the outer banks from a category 2 hurricane making landfall in Down East
Carteret County. So, storm surge is one
of the biggest factors I think still has the potential of taking more lives than
any other treat of a hurricane.
Even though
storm surge is potentially the most dangerous to those along the coast, the
biggest threat to the majority of the region is the heavy rains that come with
hurricanes.
The last 30 years, more lives have been lost from
inland freshwater flooding, than from any other threat from hurricanes. We lost over 50 lives in North Carolina from
Hurricane Floyd in 1999, with the river flooding and fresh water flooding
effects.
Knowing how
a hurricane works, what to look out for, and how to prepare for a hurricane can
ensure the safety of you and your family during the severe weather event. For updates and information on closings and
delays, severe weather updates, and weather advisories, stay tuned to Public Radio East.
Jared
Brumbaugh