Flight Training - June 2015 - 44

WEATHER

By Jack Williams
MORE THAN 75 percent of derechos
occur between April and August.

AVOIDING DERECHO
DRAMA

PROTECTION FROM DEADLY DOWNDRAFTS
A NINETEENTH-CENTURY NAME
STILL USED TODAY

A

ny pilot who's thinking of flying more than a few miles
from his or her home airport between March and September should look at the Day 1 Convective Outlook from the
National Weather Service's Storm Prediction Center (www.
spc.noaa.gov/products/outlook/day1otlk.html).

Physics professor Gustavus Hinrichs first
used the term derecho in 1888 in a paper
published by the American Meteorological
Society. "Derecho" is Spanish for "straight
ahead"-Hinrichs used the word to distinguish straight-line wind damage from that
produced by tornadoes.

44 /

FLIGHTTRAINING.AOPA.ORG

The center, in Norman, Oklahoma, is the
NWS's source of outlooks and forecasts for
convective weather. Meteorologists use
"convection" to describe thunderstorms
and the violent weather they sometimes
create, such as tornadoes, squall lines, and
mesoscale convective systems-which are

large, long-lasting, organized collections of
thunderstorms.
"Day one" refers to the day you look
at the web page. The center also has
outlooks for days two and three-if you' re
planning to fly tomorrow or the day after
tomorrow, you should take a look at these


http://spc.noaa.gov/products/outlook/day1otlk.html http://spc.noaa.gov/products/outlook/day1otlk.html http://FLIGHTTRAINING.AOPA.ORG

Flight Training - June 2015

Table of Contents for the Digital Edition of Flight Training - June 2015

Contents
Flight Training - June 2015 - Cover1
Flight Training - June 2015 - Cover2
Flight Training - June 2015 - Contents
Flight Training - June 2015 - 2
Flight Training - June 2015 - 3
Flight Training - June 2015 - 4
Flight Training - June 2015 - 5
Flight Training - June 2015 - 6
Flight Training - June 2015 - 7
Flight Training - June 2015 - 8
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Flight Training - June 2015 - Cover3
Flight Training - June 2015 - Cover4
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