• After witnessing the continued decrease of involvement in the SpotterNetwork staff in serving SN members with troubleshooting issues recently, I have unilaterally decided to terminate the relationship between SpotterNetwork's support and Stormtrack. I have witnessed multiple users unable to receive support weeks after initiating help threads on the forum. I find this lack of response from SpotterNetwork officials disappointing and a failure to hold up their end of the agreement that was made years ago, before I took over management of this site. In my opinion, having Stormtrack users sit and wait for so long to receive help on SpotterNetwork issues on the Stormtrack forums reflects poorly not only on SpotterNetwork, but on Stormtrack and (by association) me as well. Since the issue has not been satisfactorily addressed, I no longer wish for the Stormtrack forum to be associated with SpotterNetwork.

    I apologize to those who continue to have issues with the service and continue to see their issues left unaddressed. Please understand that the connection between ST and SN was put in place long before I had any say over it. But now that I am the "captain of this ship," it is within my right (nay, duty) to make adjustments as I see necessary. Ending this relationship is such an adjustment.

    For those who continue to need help, I recommend navigating a web browswer to SpotterNetwork's About page, and seeking the individuals listed on that page for all further inquiries about SpotterNetwork.

    From this moment forward, the SpotterNetwork sub-forum has been hidden/deleted and there will be no assurance that any SpotterNetwork issues brought up in any of Stormtrack's other sub-forums will be addressed. Do not rely on Stormtrack for help with SpotterNetwork issues.

    Sincerely, Jeff D.

Conditions for and Analysis of a Double Dryline Setup

Jeremy Perez

Supporter
Joined
Aug 31, 2008
Messages
342
Location
Flagstaff, Arizona, USA
With MD509 (May 7, 2014), SPC analyzed two drylines across western Oklahoma and Texas:

DISCUSSION...SURFACE ANALYSIS REVEALS A DOUBLE DRYLINE STRUCTURE ACROSS THE SRN PLAINS. THE PRIMARY DRYLINE IS GENERALLY DEMARCATED BY THE 60 DEG F ISODROSOTHERM WITH THE SECONDARY DRYLINE DEMARCATED BY THE 45 DEG F ISODROSOTHERM....DEEPENING CU IS OCCURRING AHEAD OF BOTH DRYLINES WITH TSTM DEVELOPMENT POSSIBLE ALONG EITHER THIS AFTERNOON.

MD0509.jpg


I'm trying to understand A) what conditions lead to the moisture gradient generating two separate dryline boundaries, and B) how does one detect a double dryline when analyzing surface observations and satellite.

My initial thoughts:

A) Looking at a cross section of dew points, I can visualize a variety of options....sometimes the gradient is diffuse, sometimes sharp, and in this case, perhaps more than one sharp drop, with the drier of the two boundaries still moist enough to support convection.

Assuming I've got that first part somewhat right, the tough part is

B) How do you analyze a double dryline out of surface observations, when satellite and/or radar are providing seemingly ambiguous cues? It doesn't seem like surface observations have enough resolution to pick out two steep DP drops within 50-ish miles of each other. I see a tweaked wind barb at KABI that might be a clue, but it still doesn't seem enough. Which maybe leaves satellite and radar analysis. But when I look at radar and satellite loops leading up to 1915Z, the eastern dryline is easy to pick out, but the only clue of the western dryline is a clump of convection southeast of Childress. All other patterns in the cumulus field seem like they could be gravity wave/orographic in nature...I think this really speaks to my need to get better at reading clues on visible satellite & radar and what I'm not picking out.

GOES_Visible_20140507_1915Z.png


I'm grateful for any thoughts or experiences. It would definitely be handy to notice and understand what's going on with an interesting situation like this and make an intelligent choice on targeting developing storms.
 
Back
Top