FPCN39 CWLW 181354
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 WEDNESDAY 18 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    5     200   1     41    9     650   3
KAMLOOPS     KEL       9    4     350   1     41    8     800   3
OKANAGAN     KEL       9    3     350   1     45    8     800   3
CASTLEGAR    SPOK      9    4     500   8     58    7    1150   9
CRANBROOK    SPOK      9   -1     950  15     55    3    1150  15
REVELSTOKE   KEL       9    4     450   1     10    5     550   1

*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    W    9   NW  22   NW  37
CRANBROOK             W   13   W   33

TODAY'S VENTING: GENERALLY FAIR. GOOD AT HIGHER ELEVATIONS.



VENTING FOR THURSDAY: POOR.



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    0    2050  16    100    3    3950  17
PR. GEORGE   P.G.      9   -3     750   0     28    0     950   7
SMITHERS     P.G.      9   -2     750   0     22    0     800   5
WELLS GRAY   P.G.    100    0    2200  17    100    3    4000  17
FT NLSN      F.N.      9  -20     400   9      9  -16     400   9
FT STJOHN    F.N.     22  -13     850   9     39   -7    1000  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
PR. GEORGE            W   24   NW  46
SMITHERS              SW  37   SW  46

TODAY'S VENTING: POOR EXCEPT GOOD AT HIGHER ELEVATIONS.


VENTING FOR THURSDAY: POOR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    8     250   1     37   10     850   3
FRASER VLY   QUIL      9    6     250   2     32    9     650   1
SRN VRISL    QUIL      9    5     150   0     13   10     400   1
CNTRL VRISL  QUIL      9    6     150   0     10    9     250   1
NRN VRISL    HRDY     14    6     100   9     53    9     750   7
TERRACE      ANT      10    0     200  19     10    2     200  19
STEWART      ANT       9    3       0   9      9    2       0   9

*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    SW  11   W   19   NW  13
PORT HARDY   S   43   S   50   S   33
SANDSPIT     S   61   S   61   S   61

TODAY'S VENTING: POOR TO FAIR.


VENTING FOR THURSDAY: POOR.


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


END/GF