<html><body><div style="color:#000; background-color:#fff; font-family:garamond, new york, times, serif;font-size:12pt"><div><span>Convective weather cells - including thunderstorms - can often be very compact storms, with precipitation of any kind - rain, hail, graupel, snow - being confined to very narrow swaths. One place can see heavy accumulation, and another location a mere few hundred yards away or less may see nothing at all.</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: garamond, 'new york', times, serif; background-color: transparent; font-style: normal; "><span><br></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: garamond, 'new york', times, serif; background-color: transparent; font-style: normal; "><span>OTOH, large geyser clouds certainly create pockets of precip - something like Excelsior Geyser on a cold still morning may be able to produce significant rain or freezing
rain. A geyser cloud on a still day is, in effect, a small localized convective cell.</span></div><div> </div><div>Bruce Jensen,<br>California, USA<br>~~~~~~~~~~~~~~~<br><br></div><div>"[Yellowstone] is a fabulous country, the only fabulous country; it is the one place where miracles not only happen, but where they happen all the time." ~ Thomas Wolfe<br> <div style="font-family: garamond, 'new york', times, serif; font-size: 12pt; "> <div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "> <div dir="ltr"> <font size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Meg Justus <megj@nwlink.com><br> <b><span style="font-weight: bold;">To:</span></b> Geyser Observation Reports <geysers@lists.wallawalla.edu> <br> <b><span style="font-weight: bold;">Sent:</span></b> Wednesday, October 10, 2012 10:41 AM<br> <b><span style="font-weight: bold;">Subject:</span></b>
[Geysers] Thermal Basin-Induced Weather?<br> </font> </div> <br>
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<div><font color="#008000" size="4">I don't know if the steam does affect it in
Yellowstone, but here in western Washington state, highly localized graupel
happens every once in a while, esp. in the springtime. From what I
understand about the phenomenon here at least, it's got more to do with varied
topography than anything else.</font></div>
<div><font color="#008000" size="4"></font> </div>
<div><font color="#008000" size="4">Meg Justus</font></div>
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<blockquote style="BORDER-LEFT:#008000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px;">
<div style="background-color: rgb(255, 255, 255); font-family: 'times new roman', 'new york', times, serif; color: rgb(0, 0, 0); font-size: 12pt; ">
<div style="background-color: transparent; font-style: normal; font-family: 'times new roman', 'new york', times, serif; color: rgb(0, 0, 0); font-size: 16px; "><span style="FONT-SIZE:12pt;">Around 6pm, while driving past Midway Geyser Basin, I
was astonished to see significant accumulation of hail/graupel along the
roadway. The slopes around the Midway parking area still had an inch+ of
the stuff on the ground. The area of hail deposit was so small and
highly concentrated at Midway (perhaps only within 100 yards North or South of
the parking area) that I wondered if significant amounts of steam (natural or
man-made) have been known to affect the type of precipitation that falls on an
area. Or was it just happenstance that the hail only fell there?
Any thoughts?</span></div></div></blockquote></div>
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