FPCN39 CWLW 191323
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 MONDAY 19 OCTOBER 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      16    7     500   2     41   13    1500   3

KAMLOOPS     KEL      24    7     900   3     44   13    1700   3

OKANAGAN     KEL      13    6     550   2     44   13    1700   3

CASTLEGAR    SPOK     22    7     800   4     42   13    1450   4

CRANBROOK    SPOK     15    2    1100   2     40   11    1600   4

REVELSTOKE   KEL      25    7    1000   3     41   12    1700   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N    9   N   19
CRANBROOK             NW   9   N   30

TODAY'S VENTING: ONLY FAIR THIS AFTERNOON DUE TO A RIDGE OF HIGH
PRESSURE.


VENTING FOR TUESDAY: POOR TO 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.      9    5     950   9     44   10    1350   9

PR. GEORGE   P.G.     25    5     900   9     44    9    1150   9

SMITHERS     P.G.     38    7     900   9     45   10    1000   9

WELLS GRAY   P.G.     10    5    1000   9     50   10    1450   9

FT NLSN      F.N.      9    5     400  19      9   12     400  19

FT STJOHN    F.N.     50    9    1000  18    100   13    2000  28


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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  33   W   50
SMITHERS              SW  50   W   50

TODAY'S VENTING: GENERALLY FAIR THIS AFTERNOON DUE TO A RIDGE OF
HIGH PRESSURE. GOOD IN THE BC PEACE DUE TO STRONG WINDS.

VENTING FOR TUESDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    8     100  15     52   13     600  10

FRASER VLY   QUIL      9    9      50  15     50   16     800   7

SRN VRISL    QUIL      9    9     150   0     50   16     800   7

CNTRL VRISL  QUIL      9    9     150   0     50   15     800   7

NRN VRISL    HRDY      9    8       0   4     26   12     400   5

TERRACE      ANT      11    9     250  28     11   10     250  28

STEWART      ANT       9    7       0   8      9   10       0   8


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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   15   E   22   NE  19
PORT HARDY   SE  11   SW   9   W   17
SANDSPIT     S   57   SW  61   SW  59

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR TUESDAY: FAIR




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


END/MWSO