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Everything posted by Jamie M
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
The discussion from that in relation to here: ... SE UK, France, BENELUX, W/S Germany, Switzerland, Austria, N Italy ... Due to the large differences among the NWP model simulations, this is a highly uncertain forecast. Decided to go for a broad Lvl 2 to cover an area where the environment is most favorable for intense and well-organised convection. Morning hours will likely start with one or more elevated clusters over N France and BENELUX. Moderate shear above the boundary layer and 1000+ J/kg of MUCAPE may result in isolated instances of large hail. The remains of the elevated clusters may later become foci of surface-based storm development as the heating destabilizes boundary layer. This scenario is depicted by some high-resolution, convection allowing models, yielding convective windstorms over S Germany. Towards the afternoon hours, models simulate a pronounced overlap of high CAPE (2000+ J/kg) and strong shear (25+ m/s in 0-6 km layer) acrross central to N France, perhaps reaching up to S Belgium. The highest CAPE is forecast along the boundary between a very well mixed and rather dry airmass advected from S and more abundant low-level moisture to N. The exact position of this boundary and its evolution differs from one model to another. Therefore, this has to be tracked during the day to establish more precise location of the highest severe weather corridor. The lack of clear forcing from either the cold front or other synoptic-scale features makes it difficult to predict exact timing, location and coverage of storms. Some of the high resolution models show initiation of storms over Massif Central and their progression towards the E with high risk of severe wind gusts due to the well mixed boundary layer combined with 0-3 km bulk shear around 15 m/s. Towards the evening hours, isentropic lift due to the warm-air advection will likely initiate further storms N of the boundary. These will rapidly become elevated supercells or bow-echoes with threats of large to very large hail and severe wind gusts. Towards BENELUX and NW Germany, CAPE will decrease and mostly skinny CAPE profiles are foreast, reducing the threat of large hail to some degree. Still, the risk will be present with elevated supercells, as well as isolated risk of severe wind gusts. The highest coverage of storms is forecast during the overnight hours. Both here, and over N France, 0-1 km shear is forecast to increase towards the night, but the storms will likely be elevated, reducing the tornado ris -
Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
Distraught that intense carnage isn't carried out -
Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
Disgusted and depressed my windows won't be smashed to bits -
Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
13487235_258942274471913_125102370_s.mp4 Some 1 am lightning from that storm, think the 25th was quite stormy as well iirc -
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
Want my heavily sheared rain and I want it now -
August 1912: Coldest, Wettest, Dullest
Jamie M replied to Weather-history's topic in Historic Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
Was very surprised that the electrics didn't trip, grandparents on the other side of town had their electrics go even though they were further away -
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Aye it really is quite good although there are small errors on some figures etc but it's good for a general look at things in the past and what went on even if it's a bit rough around the edges at times
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Storms and Convective discussion - August 2023
Jamie M replied to Supacell's topic in Storms & Severe Weather
Video of the storms