FPCN39 CWLW 141400
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT WEDNESDAY 14 APRIL 1999 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL       9    6     500   0    100   14    3200  12
KAMLOOPS     KEL      11    6     650   1    100   14    3350  12
OKANAGAN     KEL       9    5     550   0    100   14    3350  12
CASTLEGAR    SPOK     31    6     800   8    100   14    3500  12
CRANBROOK    SPOK     10    4     950   8    100   12    3950  12
REVELSTOKE   KEL      10    5     650   1    100   13    3450  12

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N   11   N   24
CRANBROOK             VR   5   N   15

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: FAIR

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.     73    2    2100   8    100   12    3950   8
PR. GEORGE   P.G.     45    2    1200   8     97    9    2700   8
SMITHERS     P.G.     36    3    1050   6    100   11    3500   9
WELLS GRAY   P.G.     73    2    2100   8    100   12    4000   8
FT NLSN      F.N.     15    4     500   6    100   10    3400  25
FT STJOHN    F.N.     67    3    1350  12    100    8    3700  27

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   W   15
SMITHERS              S   19   SW  15

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     20    8     300   6     78   14    1400   8
FRASER VLY   QUIL     21    8     250   6     86   16    1650   8
SRN VRISL    QUIL      9    7     250   0     68   14    1350   6
CNTRL VRISL  QUIL      9    7     250   0     68   14    1350   6
NRN VRISL    HRDY     49    7     500  10     74   12    1000  10
TERRACE      ANT       9    4     200  10    100    9    1850  12
STEWART      ANT       9    5       0   9    100    9    1750  12

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   17   E   22   NE  13
PORT HARDY   SE   9   SE  17   VR   5
SANDSPIT     S   56   S   54   S   46

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: FAIR

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


END/
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