FPCN39 CWLW 071400
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 FRIDAY 7 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     100   10    1450  18    100   15    3200  22
KAMLOOPS     KEL     100   11    3350  22    100   15    3350  12
OKANAGAN     KEL     100    9    2100  18    100   14    3350  12
CASTLEGAR    SPOK    100   10    2700  33    100   15    3500  12
CRANBROOK    SPOK    100   11    3950  36    100   14    3950  16
REVELSTOKE   KEL     100    9    2700  20    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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   20   W   28
CRANBROOK             SW  13   SW  30

TODAY'S VENTING:  GOOD

VENTING FOR SATURDAY: 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    6    2050  36    100   12    2850  28
PR. GEORGE   P.G.    100    5    1500  30    100   10    2200  31
SMITHERS     P.G.     39    5     950   8    100    9    1950  22
WELLS GRAY   P.G.    100    6    2050  36    100   12    4000  26
FT NLSN      F.N.     23    4     700   5     66    6    1050  12
FT STJOHN    F.N.    100   11    2050  24    100   13    2250  25

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   19   W   22
SMITHERS              SW  24   SW  22

TODAY'S VENTING:  GOOD

VENTING FOR SATURDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    9    2000  18    100   13    3100  12
FRASER VLY   QUIL    100    9    1700  18    100   14    3800  12
SRN VRISL    QUIL    100    9    1800  16    100   13    3000  12
CNTRL VRISL  QUIL    100    8    1500  16    100   13    3050  12
NRN VRISL    HRDY     82    6     900  13    100   10    2500  12
TERRACE      ANT     100    6    2150  11    100   10    3200  12
STEWART      ANT      88    7    1550   9    100   10    2700  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   17   W   19   W   20
PORT HARDY   SW  19   SW  22   SW  20
SANDSPIT     W   44   W   31   SW  28

TODAY'S VENTING:  GOOD

VENTING FOR SATURDAY: GOOD




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


END/JMS
$$$$^^