Spring was slow to build in, and summer hasn’t been particularly fast in coming either. We haven’t yet had a long stretch of hot weather like we sometimes get in May. We have, however, been hit with some severe weather in the second half of may as is often the case. (Last year we did not have that many severe storms but the start of a very wet period was beginning).
Around the middle of the month, a cold front came through. I heard the rain and wind overnight, but little did I realize that just a little ways to my north there was a tornado warning! No tornado touched down as far as anyone knows, but there was a microburst. If you have a telephone pole embedded in your roof you probably don’t care which it was that injected communication infrastructure inside your shed, and to the turkey hunter who had the terrifying experience of hearing the freight-train noise as it came through (apparently microbursts make that sound as well as tornados?)
In a sense, a microburst is a tornado in reverse, except that it doesn’t spin. A tornado is basically a very intense localized thunderstorm updraft that becomes more and more intense as it spins tighter and tighter, and then reaches the ground and causes havoc. A microburst is an intense localized thunderstorm downdraft, which can be as strong as all but the nastiest tornadoes, but consists of falling instead of rising air. A microburst blows debris outward where a tornado in practice sucks it inward, but in reality tosses it everywhere in a spiral pattern. Microbursts are often associated with heavy rain, and tornadoes don’t have rain falling right in them, though it may wrap around them. After all, something powerful enough to toss a tractor trailer into the air isn’t going to have any problem keeping raindrops from falling in that spot.
Yesterday an even more intense storm wreaked havoc in the Rutland Vermont area. Most discrete severe thunderstorms (as opposed to lines of storms) take the form of mesocyclones or supercells, storms in which the entire thunderstorm rotates. You can see a video of a very impressive supercell rotaing across wyoming here. Supercells often take the form of a hook on radar due to their rotation moving the rain around.
Here’s a radar image of a massive supercell containing an extremely strong tornado, from Wikipedia’s Hook Echo stock image:
and here’s a radar image from the storm yesterday in Vermont, from the Radarscope app:
The storm looked to be heading straight for Brandon, but took a jog to the south and made a run at Rutland instead. Apparently very severe storms sometimes take right turns in that manner. In Rutland the hook became less prominent but the radar reflectivity became even more intense. Very intense radar reflections like that often mean hail.
Rutland was indeed hit with large golf-ball sized hail, big enough to hurt people who were caught in it and to damage cars. Wind damage in the storm caused building damage and blew down trees. The National Weather Service did another survey and did not find any evidence a tornado touched down, but there was evidence of winds up to 85 miles per hour. Perhaps a microburst, or some other sort of thunderstorm wind, but whatever it was, it was enough to do a lot of damage. It’s possible a tornado touched down in a farm field or remote forest where it wasn’t detected, but we will never know for sure.
Tornados may be rare in this region, but even if these storms didn’t create one, a storm near Albany just across the border in New York did probably have a tornado, and it destroyed a home. This storm also had a very impressive hook echo.
and the tornado that was near the Denver Airport recently created an even more impressive signature on radar as it moved straight for the radar tower.
The Denver airport seems to be a magnet for tornadoes, microbursts, and other severe weather. Apparently whoever chose the site wasn’t familiar with the local climate, unless of course the climate has changed since they built the airport in a way that is making more storms hit the area. I’m not sure which is more likely.
Our location did not have any severe weather, and in fact not even much in the way of thunder. We did have some dramatic cloud formations move through, however. The sky always looks so much more impressive in person than on photos, so I’ve experimented with upping the contrast and vibrancy of these photos. Some of them ended up with weird color artifacts (and one with reflections from a window) but they give you an idea about what late spring in Vermont can look like.
Severe weather season is just starting here, so it’s likely there will be more thunderstorms over the first part of summer.