Storm Highway by Dan Robinson
Weather, photography and the open roadClick for an important message
Home | Blog Index | Blog Archives | Christianity & Faith Essays

                   Wednesday, May 16, 2007 - 1:15AM EDT

Still on the roller coaster

30 Years of Storm Photography
Important Message
Dan's RSS/XML feed
Dan's YouTube Video Channel

My last forecast post was during a time when things were looking pretty dismal for the return of chaseable weather on the Great Plains. Now, the GFS is starting to come in to line with the ECMWF on developing an OK-looking western trough and pushing it through the Plains next week.

GFS 500mb forecast for May 22

Notice how far north the trough is compared to the last ones. This would suggest the severe weather area setting up from northern Kansas into the Dakotas. Now here's the problem. Here is a look at the current surface map for Oklahoma (current as of this post).

Current surface observations

Notice the wind is pushing the air southward, with widespread dewpoints in the 40s (very low for this time of year). This is due to the passage of a cold front that is surging way down into the Gulf of Mexico. The gist of this is that the moisture situation on the Plains is being 'reset' back to the drawing board. Moisture is one of the critical ingredients for tornadic supercells, so until the dewpoints climb back to the 60s and 70s underneath that approaching trough, the trough will be of little consequence other than a good round of hail and lightning-producing storms. Until the winds turn back northward, the Gulf moisture cannot flow back onto the Great Plains. For this reason, I'm not too excited about the upcoming trough.

However, things are apt to change. A quick turnaround of the winds can rapidly bring the moisture back, and the trough could end up a little further south. It's all to early to tell right now. I'm still more inclined to wait for a better trough with deeper moisture (if we do get one), so we'll keep our higher probabilities on the post-Memorial Day period.

Based on the current outlook, this probability table charts the chance of our trip starting on a particular date:

2007 Storm Photography Expedition - Departure Date Probability as of May 16
May 16-180%
May 19-2510%
May 26-June 230%
June 3-1540%
No trip20%

30 Years of Storm Photography
Important Message
Dan's YouTube Video Channel
Dan's Twitter feed
Dan's RSS/XML feed

This web site is made possible by support from CIS Internet.
CIS Results-Oriented Internet Marketing

GO: Home | Storm Expeditions | Photography | Extreme Weather Library | Stock Footage | Blog

Featured Weather Library Article:

Lightning FAQ
Everything you ever wanted to know about lightning!
More Library Articles

All content © Dan Robinson. All usage requires a paid license - please contact Dan for inquiries.

Web Site Design and Internet Marketing by CIS Internet