0 | 1.00" | 40 | 794 |
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TORNADOES | HAIL | WIND | MILES |
May 20th was the start of a week long chase vacation which I usually take around Memorial Day each year. This year I moved it forward a week since it looked like a good week of consistent activity. Also, the targets appeared to be mostly in the High Plains which I prefer to chase more than other areas of Tornado Alley.
The synoptic setup across the United States was dominated by a Rex block over the east which was causing high amplitude troughs across the west. This allowed for a string of days with severe weather in the high plains. This day featured a narrow corridor of marginal CAPE across the High Plains stretching from the Candian Border down to Big Bend. A low pressure over Montana with a trailing cold front was going to combine with upslope flow to present decent chase opportunities from Montana to Texas. I was particularly interested in the corridor from Douglas, WY to Brush, CO.
The 13z SPC outlook had a 2% tornado corridor stretching from Montana to the Texas Panhandle and later added a 5% tornado risk in Southeastern Wyoming at the 1630z update. I had left home around 13z and began the trek westward along I-80 with an original plan to make a north/south decision once I arrived in Cheyenne.
I arrived in Cheyenne at 18z and a cumulus field was already percolating in South Central Wyoming while Colorado was still clear. I made the decision to head north on I-25 towards Douglas. A cell started to fire just west of Wheatland around 19z so that became my target.
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The storm had a nice RFD cut but it was still holding onto the terrain and taking it’s time rolling off the hills.
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The storm continued to move almost due north approaching Douglas and it started developing some interesting lowerings including just south of Douglas when some exceptionally scary looking clouds prompted a few funnel reports.
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As this was occuring storms to the west had thrown out an outflow boundary that was on a collision course with this storm and would ultimately cause it’s demise. At this point I was pretty sure these storms weren’t going to do anything so I turned my attention back south where some cumulus towers were bubbling in northeast Colorado.
As I traveled south storms continued to fire south along the front I figured the chase was just about over so I headed east on US 34 towards Fort Morgan where I planned to stay the night. As I approached, tail end charlie started to look pretty good.
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I decided to track with this storm in case it did something as sunset was imminent, and while I didn’t get a tornado, it did put on a show.
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A quite stunning finish to a mediocre chase day. I went back to Fort Morgan for the night after dark finally set in and I was finished watching the lightning.
Chase Recap
START | END | DURATION |
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Grand Island, NE @ 20/1237Z | Fort Morgan, CO @ 21/0310Z | 14 hours, 33 minutes |
INTERCEPTS | CHASER ENCOUNTERS |
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None | None |