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                   Saturday, May 12, 2018

Day 1: Clinton to Chickasha, Oklahoma (May 2)

By DAN ROBINSON
Storm Chaser/Photographer
25 Years of Storm Chasing
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4K VIDEO: Full-day timelapse of this chase, 4-way view

I managed to get one day of Great Plains chasing in this year on the first expedition of the 2018 season. I had originally intended to leave on Tuesday morning the 1st and chase the triple point in Kansas, but I stayed up too late on Monday night and could not fall asleep in the short window I had left. Facing the dangerous prospect of a 7-hour drive followed by another 7 hours of chasing all on 30+ hours without sleep, I had no choice but to scrub the departure on the 1st. I believe I would have seen the Tescott, Kansas EF3 had I been able to go - meaning this is the first tornado I've missed due to sleep deprivation concerns. I could have easily managed that kind of awake interval when I was younger, but as I get older, it's become a danger that I'm not willing to risk.

Finally rested up with an extra day, I departed for Oklahoma at 5AM on Wednesday with a general target from Woodward to Elk City, Oklahoma, to be refined later in the day. I arrived in Oklahoma City after 1PM and made my final forecast. I chose Clinton, Oklahoma, as it appeared that the environment to the south would become the most favorable through late evening.

At Clinton, I stocked the hail cooler with dry ice and mounted the hail shields as targetable storms developed to my west and southwest. I went over to look at the storm near Foss Lake, and finding it junk, dropped down to the better-organized storm at Hobart. I lost my Verizon internet data 5 miles south of I-40 and didn't get it back until near the end of the chase at Chickasha, with my old satellite-based standby ThreatNet turning out to be vital once again for radar data.

I turned east through the forward flank of the Hobart storm to try and cut ahead of the meso at Mountain View, but it beat me across the road. I ended up in the RFD here, then used Highway 9 and 146 at Fort Cobb Lake to finally get back ahead of the storm - now undercut with a merged RFD and FFD.

I went all the way east to Minco and dropped south to the next storm at Pocasset, which slowly began wrapping up as it approached. I tried to jump down to Chickasha to get on the H.E. Bailey Turnpike to stay with it, but the blinding RFD precip beat me into town. I was on the turnpike just southeast of the tornadic circulation at Amber, but never could get out of the rain to see anything.

After this, I went to the north OKC tower farm for upward lightning, but there was none due to the lack of a well-developed trailing stratiform region. Only a few anvil crawlers peeked through on the back side of the line:

That was the only time I used my cameras during this day - a sign of a less-than-stellar chase. I ended the chase here at 10:00PM and headed up to Claremore for the night. I arrived home the following afternoon.

NEXT PLAINS CHASE: Day 3: Severe storms from Parsons, KS to Springfield, MO >

Chase forecast update #6

Models do not show a favorable pattern worthy of chase expeditions for as far out as they can be trusted (10 days or so). A persistent Hudson Bay vortex (eastern Canada) is keeping eastern troughing/central US ridging entrenched through the period, not allowing western troughs to develop and/or eject into the Plains. As a result, prospects for trip #2 are very low for the next 2 weeks.

The following table charts the probabilities for a Plains chase expedition taking place for the date ranges shown:

2018 Plains Chase Expeditions - Probabilities as of May 12
May 12-150%
May 16-202%
May 21-3110%

25 Years of Storm Chasing
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