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Midsummer Weather Patterns: Quiet Conditions with Localized Convection

This study explores a typical midsummer weather situation characterized by quiet atmospheric conditions, weak pressure gradients, and minimal synoptic forcing for convection. Deep convection occurs only in specific orographically favored locations. Daily meteorological parameters exhibit consistent patterns until noon, typical for many summer days. The flow regime transitions from northwest to southwest, leading to rising temperatures and increasing instability. The analysis of evapotranspiration, specific humidity, and humidity divergence provides insight into these changing conditions.

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Midsummer Weather Patterns: Quiet Conditions with Localized Convection

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  1. Weather situation: • „quiet“ midsummer pattern with weak pressure gradients and little synoptic forcing for convection • Deep convection is initiated only locally at orographically favoured spots • The meteorological parameters show similar daily courses (at least until noon) => The days of this case study can be considered as representative for a large number of days each summer! Day-to-day differences: • The large-scale flow regime slowly changes from NW to SW • Rising temperature level and increasing instability back

  2. Evapotranspiration (06 – 18 UTC): REF

  3. Precipitation (06 – 18 UTC): REF EXP red numbers: first precipitation at .. UTC

  4. 2m specific humidity (09 UTC): REF EXP

  5. 2m specific humidity (12 UTC): REF EXP

  6. 2m humidity divergence (12 UTC): REF EXP Green numbers: relative decrease of humidity convergence [%] compared to REF

  7. Evapotranspiration (06 – 18 UTC): REF

  8. REF EXP red numbers: first precipitation at .. UTC

  9. 2m specific humidity (09 UTC): REF EXP

  10. 2m specific humidity (12 UTC): REF EXP

  11. 2m humidity divergence (12 UTC): REF EXP Green numbers: relative decrease of humidity convergence [%] compared to REF

  12. Evapotranspiration (06 – 18 UTC): REF

  13. REF EXP red numbers: first precipitation at .. UTC

  14. 2m specific humidity (09 UTC): REF EXP

  15. 2m specific humidity (12 UTC): REF EXP

  16. 2m humidity divergence (12 UTC): REF EXP Green numbers: relative decrease of humidity convergence [%] compared to REF

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