<div dir="ltr"><div><br></div><div><font size="4" face="comic sans ms,sans-serif"><b>To Non-Santefeans: the occasion for this correspondence is the fact that it has rained, thundered, and hailed pretty steadily here for the last two days, a lot of it at night. Total rain not that great (over an inch) but the steadiness and the duration has be remarkable for this desert town. <br></b></font></div><div><font size="4" face="comic sans ms,sans-serif"><b><br></b></font></div><div>Hi Steve, Certainly diurnal heating is the most common way to kick of mountain thunderstorms with hail. The only thing I can imagine is that the air is very unstable and there is enough lift provided by the mountains to capitalize on this instability. The radar shows a series of showers riding up slope from ABQ to SAF. Also, as you will see from the chart below which was made at just the time that another big hailstorm was pelting Trader Joes, there is a long skinny CAPE and all of it is above the freezing level. So there is several thousand feet for hail to form in. All that airmass is moving rapidly to the NE, providing a lot of sheer with the lower levels. <br></div><div><br></div><div><img src="cid:ii_mac2thcm0" alt="image.png" width="488" height="386"><br></div><div>the regional map for the same time shows a wea<img src="cid:ii_mac38w9v1" alt="image.png" width="549" height="379" style="margin-right: 0px;"><br>k front directly above us and with strong SSW winds aloft, this may be contributing to the lift. over the big bend region a low pressure areaa continues to develop and is packing the dryline quite nicely there. Severe weather has broken out in southern TX on the east side of the dry line. <br></div><div><br></div><div>The next chart <a href="(https://www.spc.noaa.gov/exper/mesoanalysis/new/viewsector.php?sector=12#">(https://www.spc.noaa.gov/exper/mesoanalysis/new/viewsector.php?sector=12#</a>) shows the jetstream circulation. the cluster of red lines in west TX and east NM shows the amount of lift being provided by motions of the Jet Stream, <br><br></div><div>Thus I am guessing that diurnal heating has very little to do with what;s going on.</div><div><br></div><div>nick</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, May 5, 2025 at 8:27 PM steve smith <<a href="mailto:sasmyth@swcp.com">sasmyth@swcp.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
On 5/5/25 1:32 PM, Nicholas Thompson wrote:<br>
> so, as the Chief Weather Nerd on the list, I thought I ought to be <br>
> able to say something about this morning's hail storm. I can't really.<br>
<br>
<br>
I live north of Santa Fe, at the point were the Rio Grande cuts through <br>
the lava fields from the Jemez thus also becoming a bit of a wind-funnel <br>
and a locally low-altitude (5400ft just miles from the 6500-7500 foot <br>
mesas of White Rock and Los Alamos) cold-air drainage.<br>
<br>
We had heavy hail at 1AM.... I don't know that I've ever experienced <br>
much hail at all outside the daylight hours, I always told myself the <br>
story that the conditions that lead to hail required ground-temperature <br>
based thermals?<br>
<br>
inquiring minds want to know.<br>
<br>
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</blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="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>