FPCN39 CWLW 181351
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 SUNDAY 18 JANUARY 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    2     200   1     12    3     500   1
KAMLOOPS     KEL      20    2     500   7     54    4     800  12
OKANAGAN     KEL      10    2     500   1     24    4     800   3
CASTLEGAR    SPOK     23    2     750   6     30    4     800   7
CRANBROOK    SPOK      9   -4     950  11      9    1     950  11
REVELSTOKE   KEL       9    1     500   1     10    2     500   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   S   28   S   59
CRANBROOK             S   17   SW  54

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: 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.     46   -1    1300  12     92    4    1550  24
PR. GEORGE   P.G.     14   -3     800   5     29    0     950   8
SMITHERS     P.G.      9   -4     500   1     18    0     850   3
WELLS GRAY   P.G.      9   -1    1000  22     84    3    1500  23
FT NLSN      F.N.     15  -24     500   5     25  -20     700   5
FT STJOHN    F.N.     22  -14     950   6     23  -13     950   6

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   57   S   56
SMITHERS              S   41   S   56

TODAY'S VENTING: GOOD THIS AFTERNOON IN THE SOUTH OTHERWISE POOR.

VENTING FOR MONDAY: POOR.



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    8     100  17     70    9     300  30
FRASER VLY   QUIL      9    6      50  37     35    7     150  30
SRN VRISL    QUIL      9    9       0  10     70   10     300  30
CNTRL VRISL  QUIL      9    7      50  10     70    7     300  30
NRN VRISL    HRDY     11    7      50  34     90    8     400  34
TERRACE      ANT       9    0     200  21     45    0     400  21
STEWART      ANT       9    4       0  12      9    0       0  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   43   S   56   SW  59
PORT HARDY   S   48   S   63   S   74
SANDSPIT     S   43   S   48   S   54

TODAY'S VENTING: GOOD FOR MOST OF THE COAST DUE TO STRONG WINDS.

VENTING FOR MONDAY: FAIR.




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


END/JDG