FPCN39 CWLW 041526
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 TUESDAY 4 NOVEMBER 1997 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      35   10     600   7     60   14    1100   7
KAMLOOPS     KEL      17    7     500   5     31    9     700   7
OKANAGAN     KEL      17    7     500   5     48   12    1000   7
CASTLEGAR    SPOK     27    9     950   4     36   11    1250   4
CRANBROOK    SPOK      9    4     950   6     32    8    1350   6
REVELSTOKE   KEL      10    5     450   5     15    7     550   5

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   13   W   20
CRANBROOK             VR   5   W   26

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR WEDNESDAY: 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.     22    4    1050  15     65    7    1450  15
PR. GEORGE   P.G.     19    5     800   9     41    6    1000  12
SMITHERS     P.G.     10    4     650   1     26    6     700  10
WELLS GRAY   P.G.     36    5    1200  15     54    6    1350  15
FT NLSN      F.N.     29    0     650   8     34    2     700   8
FT STJOHN    F.N.     24    1     900   8     42    4    1150   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   46   SW  52
SMITHERS              SW  67   SW  52

TODAY'S VENTING: FAIR.

VENTING FOR WEDNESDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     17   11     200   7     70   15    1200   8
FRASER VLY   QUIL      9   10      50   7     68   15    1100   8
SRN VRISL    QUIL     15   11     150   5     64   15    1000   7
CNTRL VRISL  QUIL     15   11     150   5     32   13     400   7
NRN VRISL    HRDY     30   11     300   8     45   13     550   8
TERRACE      ANT      11    7     250  35     11    9     250  35
STEWART      ANT       9    9       0   9      9    9       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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  26   S   37   SW  41
PORT HARDY   S   59   S   72   S   72
SANDSPIT     S   82   SW  78   SW  82

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: FAIR

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


END/DB