Re : Graag posten over het koufront, weet men wat er komen gaat
Bericht van: Wietse (Groningen) , 05-12-2013 14:09
Uitleg van Estofex nav Level 3 waarschuwing.
A convective line with ample lightning activity has developed along a cold front across the North Sea.
This activity is collocated with the left exit of a particularly strong mid/upper-level jet streak.
Near the line, a very strong low-level wind field is in place with wind speeds around 40 m/s at 850 hPa. A combination of downward momentum transport and squall-line internal dynamics will likely be capable of producing gusts of around 35 - 40 m/s.
The line is expected to move quickly SEward reaching the Dutch, German and Danish coasts during the early afternoon. Upon interacting with boundary-layer induced friction over land, storm-relative helicity ahead of the system should increase strongly with NWP guidance yielding values in excess of 800 m2/s2 0-1 km SRH. At the same time, buoyancy should gradually diminish as the air ahead of the line gradually becomes drier. Nevertheless, some risk of tornadoes will exist, which, if they develop, may be strong.
A convective line with ample lightning activity has developed along a cold front across the North Sea.
This activity is collocated with the left exit of a particularly strong mid/upper-level jet streak.
Near the line, a very strong low-level wind field is in place with wind speeds around 40 m/s at 850 hPa. A combination of downward momentum transport and squall-line internal dynamics will likely be capable of producing gusts of around 35 - 40 m/s.
The line is expected to move quickly SEward reaching the Dutch, German and Danish coasts during the early afternoon. Upon interacting with boundary-layer induced friction over land, storm-relative helicity ahead of the system should increase strongly with NWP guidance yielding values in excess of 800 m2/s2 0-1 km SRH. At the same time, buoyancy should gradually diminish as the air ahead of the line gradually becomes drier. Nevertheless, some risk of tornadoes will exist, which, if they develop, may be strong.
