<div dir="ltr"><div>As a part of my plan to revise my weather book, I have been working on a chapter on the jet stream. I am thinking of using the passage below as a kind of epigraph. I am sending it along because it brings together two of the salient concerns of Our Glorious Leader. Comments, fact checks, grumpy comments always welcome. <br></div><div><br></div><div>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:115%;font-size:12pt;font-family:"Aptos",sans-serif"><i>During the winter of 1944-5, in the last desperate days
of World War II, the Japanese military launched hundreds of incendiary balloons
into the jet stream, hoping to ignite fires in American forests.<span> </span>This ingenious scheme worked.<span> </span>Many balloons made the 5,000 mile trip and
some even started small fires. However, the plan ultimately failed. For a large
fire to be kindled by one of these devices, the ground had to be had to be dry,
the temperature high, the humidity <span> </span>low,
the water table depleted, all conditions that often occur during summer droughts.<span> </span><span> </span>Winter,
however, is the wet season in the American west. The same jet stream that brought
in the balloons, also brought in waves of pacific moisture that soaked the
ground and covered the high mountains in deep banks of snow.<span> </span><span> </span><span></span></i></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:115%;font-size:12pt;font-family:"Aptos",sans-serif"><i>This bit of military history illustrates the relationship
between the jet stream and the weather we all experience, day by day.<span> </span>The jet stream can initiate severe weather,
can spark it, one might say, but only where conditions below have been primed.<span> </span>Its seeds can only flourish where the ground
has been prepared.<span> </span><span></span></i></p>
</div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Nicholas S. Thompson</div><div>Emeritus Professor of Psychology and Ethology</div><div>Clark University</div><div><a href="mailto:nthompson@clarku.edu" target="_blank">nthompson@clarku.edu</a></div><a href="https://wordpress.clarku.edu/nthompson" target="_blank">https://wordpress.clarku.edu/nthompson</a></div></div></div>