POSSIBLE EML STRUCTURE AND SEVERE WEATHER MID-ATLANTIC-NORTHEAST TUESDAY

NE-US

A pretty rare occurrence commonly found in the plains and mid west may be heading into northeast. An EML structure basically is a capping inversion.

Here is a fairly classic sounding demonstrating an EML.

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The idea here in short is the EML prevents deep , moist convection until high potential instability is achieved or in other words acts like a lid or cap.

When you have an absence of deep moist convection air can flow poleward in a unimpeded fashion.

Surface dew points generally do not mix out , due to prevention of deep vertical mixing. the mid level lapse rates become very steep which enhance cape values ( fast updraft accelerations)

NAM-HIRES_CAPE_ne_f54

If an EML was found in a particular sounding it MUST meet following criteria:

1) no upper low directly over region

2) lapse rates >= 8 C/km over a depth of >=200 mb

3.) RH MUST increase with height

4.) EML must be traceable whether from american/ canadian rockies or mexican plateau.

It is pretty amazing how an EML can travel 2 to 3000km from there origin without changing character.

NAM-HIRES_700mbHgtT_ne_f60

If you are looking for an EML one thing you must note is 700mb temps , most EML are associated with 700mb temps around 12 C which is our cap or lid mentioned above.

very high 700-500 mb lapse rates must be traceable upstream and most seem to eject out of the rockies.

KEEP AN EYE TO THE SKIES TUESDAY.

Meteorologist Steve Garry

 

 

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