Re: Fohn wind and rainshadow

On Jan 31, 10:49 am, Tudor Hughes <tudor...@xxxxxxx> wrote:
On Jan 30, 9:24 pm, mittens <bjohnso...@xxxxxxxxx> wrote:





On Jan 30, 3:33 pm, mittens <bjohnso...@xxxxxxxxx> wrote:> I have already requested info about fohn winds in Scotland and Wales.

Now what about the rainshadow effect in London? Does this reduce the
frequency of thunderstorms, in addition to total rainfall?

   Bob

My comment about T-storms originates from the fact that in hilly
terrain in mid-Atlantic region of the NE USA, convection thunderstorms
are more common than in areas of flatter terrain. Also, when T-storms
associated with fronts travel from west to east, the storms often
weaken as they pass over "flat" land to the east. This is a weather
phenonemon I noticed when I lived in the Philadelphia-New York City
region.

On the other hand, thunderstorms are likely more prevalent in England
away from the ocean.  In southern Ontario the "cool" temperature of
the Great Lakes in the summer retards T-storms near the shoreline.

Bob

        The lower rainfall in London and low-lying areas in east and
southeast England is mostly due to a reduction in frontal rain, our
most frequent rain type.  Although thunderstorms have some tendency to
form over ranges of hills there seems to be little effect on the
number of thunderstorms in London.  If anything, the number is
enhanced due to the heat-island effect of the city but it's a
difficult assessment to make because of the large year-to-year
variability and the necessity of taking a long period into
consideration.

Tudor Hughes, Warlingham, Surrey.- Hide quoted text -

- Show quoted text -

Hi, Tudor. Thanks for the info.

After I wrote my post I gave it some thought and realized I'd not
taken the heat-island effect into account when considering
thunderstorm formation in London.

Bob
.

Relevant Pages

  • Re: Fohn wind and rainshadow
    ... My comment about T-storms originates from the fact that in hilly ... terrain in mid-Atlantic region of the NE USA, convection thunderstorms ... are more common than in areas of flatter terrain. ...
    (uk.sci.weather)
  • Re: Fohn wind and rainshadow
    ... My comment about T-storms originates from the fact that in hilly ... terrain in mid-Atlantic region of the NE USA, convection thunderstorms ... are more common than in areas of flatter terrain. ...
    (uk.sci.weather)