FPCN39 CWLW 121422
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 MONDAY 12 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  -17     200   1     29  -12     800   3
KAMLOOPS     KEL       9  -18     350   1     20  -15     500   4
OKANAGAN     KEL      50  -13    1500   4     50  -11    1550   4
CASTLEGAR    SPOK     29  -12    1050   4     40   -9    1350   4
CRANBROOK    SPOK      9  -26     950   4      9  -20     950   4
REVELSTOKE   KEL       9  -18     450   1     16  -15     700   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   SW  13   SW  31
CRANBROOK             VR   5   W   30

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR TUESDAY: 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  -25     950  17     35  -21    1100  17
PR. GEORGE   P.G.     26  -26     850  12     31  -23     900  12
SMITHERS     P.G.     27  -22     900   5     27  -22     900   5
WELLS GRAY   P.G.      9  -25    1000  17     24  -22    1100  17
FT NLSN      F.N.      9  -34     400  15      9  -31     400  15
FT STJOHN    F.N.      9  -31     700  15      9  -28     700  15

*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            S   17   W   19
SMITHERS              SE  17   NW  19

TODAY'S VENTING: POOR TO FAIR.

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   -3     100   7     23    0     300   7
FRASER VLY   QUIL      9   -5      50   7      9   -4      50   7
SRN VRISL    QUIL     23   -1     250   7     26    1     300   7
CNTRL VRISL  QUIL      9   -3      50   6     25    0     300   7
NRN VRISL    HRDY     59   -1     550  12     61    0     600  12
TERRACE      ANT       9  -15     200   8      9  -14     200   8
STEWART      ANT       9   -8       0   3      9  -14       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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   28   SE  24   SW  26
PORT HARDY   SE  26   S   17   S   15
SANDSPIT     E   28   E   20   SE  13

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/DB