Explanations for abbreviations (TSTM, SLGT, ENH, etc.)

SYNOPSIS

A strengthening upper ridge is expanding across south-central and eastern Europe while a large trough over W Europe and N Atlantic gradually weakens with a deep cyclone moving across UK towards the North sea. Large upper low over W Russia continues weakening while drifting south. At the surface, frontal boundary pushes across central Europe and brings another day of storms in some regions.

DISCUSSION


SLGT risk has been issued for parts of central Europe with threat for isolated severe storms, capable of producing severe winds, large hail and torrential rainfall. some organized storms including a few supercells are possible along the weakening cold front within a moderately unstable and strongly sheared environment.


ENH / SLGT risks have been issued for extreme E Ukraine into SW Russia with threat for severe storms, capable of producing severe winds, large hail and torrential rainfall. Supercells are likely along the southward moving cold front within a moderately unstable and sheared environment.


SLGT risk has been issued for NW Poland into S Sweden and S Norway with threat for isolated severe storms, capable of producing severe winds, large hail, torrential rainfall and tornadoes. Isolated severe storms including a few supercells are likely within weakly to moderately unstable airmass but moderately sheared environment and enhanced helicity.


SLGT risk has been issued for S England and S Wales, N France into N Belgium and Netherlands with threat for severe non-convective winds in excess of 90 km/h. Winds will be associated with a moving deep cyclone from the UK into the North Sea.

MRGL risks have been issued for E Spain, N Morrocco and NW Algeria with threat for isolated severe storms, capable of producing severe winds, large hail and torrential rainfall.

TSTM risk areas have been placed where convective storms are likely to occur but should remain sub-severe.