Wow, prachtige foto's zeg!
Ik sluit net als jou niet uit dat het hier hoosvorming betreft. De foto's doen namelijk vermoeden dat we te maken hebben met een zogenaamde low-topped of mini-supercell. De atmosferische condities voor het ontstaan van dergelijke buien was met de aanwezige windschering dan ook zeer wel mogelijk.
Dhr Groenemeijer gaf dat ook al aan in de Estofex-forecast trouwens:
"...The Netherlands, northwestern Germany ...
Strong wind shear is observed and forecast to persist over the Netherlands and northern Germany until passage of the mid/upper trough. DCVA-related ascent and strong warm air advection ahead of the trough is expected to lead to upward vertical motion that increases the depth of the convective layer. As rather strong low level shear in the 10-15 m/s range and more than 100 m2/s2 of 0-1 km SREH are expected in combination with high CAPE values below 3 km AGL, there seems to be the potential of small rotating updrafts/supercells capable of producing tornadoes. Any rotating updrafts maty well be embedded in convective lines, that are expected to become the main covnective mode as a surface cold front sweeps through the Netherlands and northern Germany this afternoon and evening."
Ik sluit net als jou niet uit dat het hier hoosvorming betreft. De foto's doen namelijk vermoeden dat we te maken hebben met een zogenaamde low-topped of mini-supercell. De atmosferische condities voor het ontstaan van dergelijke buien was met de aanwezige windschering dan ook zeer wel mogelijk.
Dhr Groenemeijer gaf dat ook al aan in de Estofex-forecast trouwens:
"...The Netherlands, northwestern Germany ...
Strong wind shear is observed and forecast to persist over the Netherlands and northern Germany until passage of the mid/upper trough. DCVA-related ascent and strong warm air advection ahead of the trough is expected to lead to upward vertical motion that increases the depth of the convective layer. As rather strong low level shear in the 10-15 m/s range and more than 100 m2/s2 of 0-1 km SREH are expected in combination with high CAPE values below 3 km AGL, there seems to be the potential of small rotating updrafts/supercells capable of producing tornadoes. Any rotating updrafts maty well be embedded in convective lines, that are expected to become the main covnective mode as a surface cold front sweeps through the Netherlands and northern Germany this afternoon and evening."
