FPCN39 CWLW 081400
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 SATURDAY 8 MAY 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      20    7     650   3    100   13    3200   8
KAMLOOPS     KEL      20    6     750   3    100   13    3350   8
OKANAGAN     KEL      20    5     600   3    100   12    3350   8
CASTLEGAR    SPOK     20    5     800   3    100   12    3500   8
CRANBROOK    SPOK     81    4    2200   9    100   10    3950   8
REVELSTOKE   KEL       9    6    1600   0    100   11    3450   8

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   19   W   22
CRANBROOK             VR   5   W   15

TODAY'S VENTING: BECOMING GOOD BY THIS AFTERNOON.

VENTING FOR SUNDAY: GOOD.




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.    100    3    3950  12    100   10    3950  15
PR. GEORGE   P.G.    100    4    2200  12    100   11    3700  15
SMITHERS     P.G.    100    5    1650  12    100   11    3500  15
WELLS GRAY   P.G.    100    2    3500  12    100   12    4000  15
FT NLSN      F.N.     57    3     800  15     90    7    1300  15
FT STJOHN    F.N.     77    4    1350  16     98    7    1800  15

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   24   W   28
SMITHERS              W   17   W   28

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     93    8    1500  10    100   13    3100   9
FRASER VLY   QUIL     94    8    1450  11    100   13    3050   9
SRN VRISL    QUIL     72    7     950  10    100   13    3000   9
CNTRL VRISL  QUIL     90    8    1400  10    100   13    3050   9
NRN VRISL    HRDY     26    6     550   3     76   11    2350   4
TERRACE      ANT      94    5    1200  16    100    8    2350  14
STEWART      ANT      69    6     750  11    100    8    1800  13

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   19   W   17   W   15
PORT HARDY   W   17   W   17   SW   9
SANDSPIT     W   30   W   30   W   20

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.




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


END/MWSO
$$$$^^