Salmon Arm, British Columbia

Severe Weather Bulletin
issued by Environment Canada
at 3.49 am PDT Tuesday 21 may 2013.
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Watches/warnings in effect for interior British Columbia...

Rainfall warning for:
=new= Fraser Canyon
=new= South Thompson
=new= boundary
=new= West Kootenay
=new= Kootenay Lake
=new= 100 Mile
=new= Chilcotin
      b.C. Peace River.

      Significant rainfall amounts for parts of the British Columbia
      interior.

      This is a warning that significant rainfall is expected in
      these regions.  Monitor weather conditions..listen for updated
      statements.

Severe Thunderstorm Watch for:
=new= Okanagan Valley
=new= South Thompson
=new= Shuswap
=new= North Thompson
=new= boundary
=new= arrow lakes - slocan lake
=new= West Kootenay
=new= Kootenay Lake
=new= 100 Mile
=new= Cariboo.

      Severe thunderstorms possible this afternoon and evening.

      This is an alert to the potential development of severe
      thunderstorms with large hail and damaging winds.

      Monitor weather conditions.. listen for updated statements.
      If threatening weather approaches take immediate safety
      precautions.

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==Discussion==
an upper low pressure system situated off the South Coast of British
Columbia this morning is forecast to give significant rainfall
amounts to sections of the interior.  Moisture that is wrapping
around this system will continue to affect the b.C. Peace
region through much of today although the heavier rainfall is
expected to occur over areas near The Rockies where the northeasterly
upslope flow enhances precipitation intensity. Another 20 mm of rain
is possible today over these upslope areas while townsites that are
located further away may only receive 10 mm.

As the system continues to make its way southeastward, rainfall will
intensify or spread to the central and southern interior today and to
the kootenays early this evening.  General rainfall amounts of 25 to
35 mm can be expected for parts of the central and southern interior
through this evening and for parts the kootenays tonight through
Wednesday.

This upper low pressure system will situate over the Washington and
Oregon states by Wednesday morning and then remain quasi-stationary
through much of this week.  Moisture will continue to wrap around
this feature and affect the southern interior and the kootenays over
the next few days.  There is still uncertainty to the location of
this wrap-around moisture but it is not out of the question that some
of the affected regions may experience a prolonged rainfall event.

Meanwhile, conditions are favourable for the development of
thunderstorms this afternoon over parts of the kootenays and the
southern and central interior.  The potential exists that some of
these thunderstorms may become severe.  These severe thunderstorms
are capable of giving large hail and damaging wind gusts.

Please refer to the latest public forecasts for further details.

End/..