Mesoscale Discussion
Valid: Thu 02 May 2024 12:00 to Thu 02 May 2024 15:00 UTC
Issued: Thu 02 May 2024 12:16
Forecaster: TUSCHY

This Mesoscale Discussion was issued to highlight the augmented heavy rainfall risk accompanied by DMC activity over parts of W-CNTRL Germany into Belgium.

Time frame: 12Z - 00Z

The environment is prime for clustering convection which evolves along an extensive low-tropospheric low pressure channel, highlighted in latest synop/wind data. This convergence runs from Belgium SE well into CNTRL Germany.

Overall airmass quality is marginal for widespread excessive rain, but some feeding of mid-level moisture occurs from the SE into the area of concern, both highlighted in EZMWF EFI charts and layered PW products (with different weighting of the moist layers). Latest AMDARs show some weakly capped loaded-gun ascents in the MD area with imminent CI (or already underway).

Slow moving storms tend to grow upscale rather fast but forecast hodographs also feature some healthy 20 kt SR inflow with good streamwiseness, so transient rotating storms are possible with a low-end and short-lived tornado event.
The main risk will be heavy rain, probably maximized along/just ahead of the NE/E-ward marching convergence zone, where E-erly BL winds enlarge LL hodographs, a bit more favorable for temporal training/back-building. So more organized updrafts could partially offset more low-end environmental PWs with enhanced rainfall rates = augmented flash flood risk.
Betimes, with a structuring LL depression somewhere along that low-pressure channel a gradual change from convective to more stratiform precipitation occurs with ongoing healthy amounts over W-CNTRL Germany.

Further S into SW Germany, a few flash flood producing storms are also underway, but more progressive nature of the convergence zone should keep this risk more isolated and short-lived.