re: No severe weather thread today?

Posted on 6/14/23 at 3:33 pm to LegendInMyMind

Posted by deltaland

Member since Mar 2011

90911 posts

Posted on 6/14/23 at 3:33 pm to LegendInMyMind

I feel like they’re way looser these days on the parameters for a PDS than they used to be

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Posted by LegendInMyMind

Member since Apr 2019

54960 posts

Posted on 6/14/23 at 3:38 pm to deltaland

quote:
I feel like they’re way looser these days on the parameters for a PDS than they used to be

Different ball game when you start talking PDS severe thunderstorms and potential derechos. Add in a sort of hybrid setup with a broken line with embedded 80mph winds and very large hail, and they're going to issue them.

This post was edited on 6/14/23 at 3:39 pm

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Posted by Zapps4Life

Houston

Member since May 2016

290 posts

Posted on 6/14/23 at 3:44 pm to deltaland

quote:
I feel like they’re way looser these days on the parameters for a PDS than they used to be

Well, given the storm environment and structure already seen today I would say the PDS wording is spot on...

Current MLCAPE

EHI

The Energy Helicity Index (EHI) is a number which represents the combination of instability and storm relative helicity. Our calculation uses mixed layer CAPE (surface to 3000ft average parcel) and 0-3 km storm relative helicity. Values greater than 2 or 3 have been correlated to cyclonic supercells with increased tornadic potential. Negative values are indicative of an environment favorable for anti-cyclonic (left moving) supercells, but tornadoes associated with anti-cyclonic supercells are extremely rare.