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