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Severe storms forecast for W France this afternoon and evening – July 18, 2014


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Posted
  • Location: Camborne
  • Location: Camborne

    A highly robust severe weather setup is shaping up for late this afternoon and evening hours over W France, with threats for torrential excessive rainfall, severe wind gusts as well as large to locally very large hail and some tornadoes.

     

    A pronounced low is located over the Atlantic, west of the Bay of Biscay with a short wave trough being pushed NE-ward into France during the late afternoon and a second short wave in the late evening and night hours. A strong jet streak overspreads into Bay of Biscay and W France. Significant surface backing winds combine with the mid-level jet to produce a strongly sheared environment with 40-60 kt DLS and favourable veering profiles (200-350 m2/s2 SREH3). High instability is in place and with favourable QG forcing is supporting strong organized thunderstorms with high coverage.

     

    http://www.severe-weather.eu/news/severe-storms-forecast-for-w-france-this-afternoon-and-evening-july-18-2014/#more-6943

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    Posted
  • Location: Surrey and SW France.
  • Location: Surrey and SW France.

    If you don't mind, I'll post any severe weather reports and pics the chasers put up - main convective thread is too fast moving on later UK expectations.

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    Posted
  • Location: Home near Sellindge, 80m/250feet, 5miles from Coast
  • Weather Preferences: Severe Storms and Snow
  • Location: Home near Sellindge, 80m/250feet, 5miles from Coast

    Meh, I need to repair my camcorder.. This one just isn't very good

    post-7255-0-32857800-1405731345_thumb.jp

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    Posted
  • Location: Surrey and SW France.
  • Location: Surrey and SW France.

    A Google translate of our text forecast.

     

     

    AQUITAINE REGIONS NORTH ...

    RISK 2 and 3/4
    STRUCTURES: MULTI, SUP

    A very high latent instability persist until next night during all targeted departments (MUCAPE to 3500 J / kg, MLCAPE of 1500 J / kg, and MULI MLLI -6 to -9 of K). Regularly maintained by the warm and wet advection in lower layers, and associated with a reduction of more net levels of free convection, it will hatch numerous thunderstorms during the day and the next night.
    As of this morning, thunderstorms circulate in Normandy Poitou. Locally strong, they produce local heavy rains and gusts sometimes exceeding 70 km / h.
    Storms tend this afternoon to win the Ile-de-France, Picardy and Nord - Pas de Calais, maintaining essentially multicellular structures, but may locally adopt transitional supercell behavior. Sometimes severe thunderstorms will be possible, with strong isolation hail, heavy rain and wind gusts sometimes exceeding 90 km / h.
    Next evening and night, thunderstorm activity will tend to generalize all placed at risk level 2 or 3. Locally violent phenomena will then be possible regions, including a risk of large hail falls on the regions of southwest and between Centre and Picardie. Gusts locally exceeding 120 km / h wind can also occur in some cells, some of which may present arched structures. Finally, a strong electrical activity and torrential rains temporarily may be associated with these storms. The latter can produce blades> 30 mm in short time.

     

     

     

    Text and Bordeaux sounding, courtesy of Keraunos.

     

    http://www.keraunos.org/

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    Edited by Nouska
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    Posted
  • Location: United Kingdom
  • Location: United Kingdom

    Meh, I need to repair my camcorder.. This one just isn't very good

    The photo quality isn't the best but that photo is still awesome!

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    Posted
  • Location: Surrey and SW France.
  • Location: Surrey and SW France.

    Huge tally of lightning strikes in the last few hours, mainly from the very active cells in the north.

     

    Posted Image

     

    http://www.keraunos.org/temps-reel/impacts-de-foudre/orages-en-direct-france-foudre-eclairs-temps-reel-activite-electrique-suivi.html

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