
Sounding over Ames on 4pm on Monday. Textbook tornado threat across the board with enormous storm energy (CAPE), curved hodographs, 67F dews, and storm helicity of 192. The (very slight) saving grace here is that wind shear, significant tornado parameter, and helicity is a little bit on the lower side for a really high end
violent tornado threat.
The other thing to note is that a lot of models might not convect any big storms in Iowa- so I think this could be a little more conditional threat or it could be discrete supercells - NWS Des Moines has noted this in their (admittedly slightly out of date) forecast discussion this morning:
https://forecast.weather.gov/produc...MX&product=AFD&format=CI&version=1&glossary=1.
"However, model guidance over the last few runs has struggled to
produce much
convection associated with this system as it moves
through Iowa, potentially due to a lack of
convergence as it
moves through. That said, it may also be due to the expectation
of discrete
convection, which may not be getting captured well
by the coarser global models. Therefore, the potential for
severe weather on Monday is certainly there, but we will want to
continue to keep an eye on guidance in the coming days,
especially once we get nearer to the high resolution window."
Below is GFS at 4pm on Monday.
With any luck we survive Monday- last year's tornadoes in Minden and Greenfield legitimately gave me PTSD and I've been stressing all year and all winter for another event like this in the spring.