FPCN39 CWLW 281420
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 PST SATURDAY 28 NOVEMBER 1998 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    4     500   0     50    5     500   5
KAMLOOPS     KEL       9    3     500   0     35    6     550   3
OKANAGAN     KEL       9    1     350   0     30    5     550   2
CASTLEGAR    SPOK      9    3     500   5     25    5     800   5
CRANBROOK    SPOK      9    2     950   3     36    5    1700   4
REVELSTOKE   KEL       9    3     550   0     35    5     550   3

*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    VR   5   VR   5   E    9
CRANBROOK             SE   9   S   24

TODAY'S VENTING:

VENTING FOR SUNDAY: 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.     19   -3    1300   3     63    2    2150   6
PR. GEORGE   P.G.      9   -7     700   0     27    0    1400   3
SMITHERS     P.G.      9   -7     550   0     14   -2     850   2
WELLS GRAY   P.G.     27   -2    1550   4     64    2    2300   6
FT NLSN      F.N.      9   -9     400  32      9   -7     400  10
FT STJOHN    F.N.     11   -7     700  34     60   -4    1450  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   24   S   22
SMITHERS              SE  41   S   22

TODAY'S VENTING:

VENTING FOR SUNDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     47    7     450  13     86    9     950  10
FRASER VLY   QUIL     17    6     200   6     44    7     400  10
SRN VRISL    QUIL     16    6     150   5     74    9     800  10
CNTRL VRISL  QUIL      9    2      50   4     45    4      50  12
NRN VRISL    HRDY     27    3     150  14     75    6     400  20
TERRACE      ANT       9   -2     200  20     25    1     250  15
STEWART      ANT       9    0       0   3     10    1       0   3

*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    SE  20   S   20   S   20
PORT HARDY   SE  54   S   70   S   69
SANDSPIT     SE  87   S   87   S   74

TODAY'S VENTING:

VENTING FOR SUNDAY: POOR

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

END/KJ