FPCN39 CWLW 051400
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 5 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   11    2500  10    100   17    3200  10
KAMLOOPS     KEL      90    8    1850   9    100   16    3350  10
OKANAGAN     KEL      24    7     700   5    100   16    3350  10
CASTLEGAR    SPOK     37    7    1100   5    100   15    3500   6
CRANBROOK    SPOK    100    5    3950   7    100   12    3950   7
REVELSTOKE   KEL      83    7    1800   9    100   14    3450  10

*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   SW  15   SW  22
CRANBROOK             W   11   W   20

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: 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    3950  23    100   13    3950  23
PR. GEORGE   P.G.    100    6    3700  20    100   12    3700  20
SMITHERS     P.G.     12    3     750   2    100   10    3500  17
WELLS GRAY   P.G.    100    5    3950  20    100   13    4000  23
FT NLSN      F.N.     76    2    1400  10     96    5    1900  11
FT STJOHN    F.N.     97    5    2100  12    100   11    3700  11

*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            S   20   SW  37
SMITHERS              S   31   S   37

TODAY'S VENTING:




VENTING FOR THURSDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     91    9    1400  11    100   14    2350  12
FRASER VLY   QUIL     20    9     600   5     90   13    2400   5
SRN VRISL    QUIL     78    9    1150   9    100   13    2250  11
CNTRL VRISL  QUIL     79    9    1150   9    100   13    2250  11
NRN VRISL    HRDY     82    8    1300   9    100   11    2000  12
TERRACE      ANT     100    6    2000  17    100   11    3200  20
STEWART      ANT     100    7    1550  16    100   11    2850  18

*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    SE  17   S   19   SW  35
PORT HARDY   S   69   S   91   S   83
SANDSPIT     SE 102   S   98   S   87

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




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


END/MWSO
$$$$^^