FPCN39 CWLW 041351
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 4 JANUARY 1999 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   -1     200   4      9    1     200   4
KAMLOOPS     KEL       9   -1     350   4     14    0     450   4
OKANAGAN     KEL      14    0     450   4     40    1     850   7
CASTLEGAR    SPOK      9   -1     800   0      9    0     850   0
CRANBROOK    SPOK      9   -7     950  10      9   -5     950  10
REVELSTOKE   KEL       9   -2     450   4     10   -1     450   4

*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    W   11   W   33   NW  52
CRANBROOK             W   17   NW  57

TODAY'S VENTING: POOR.

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    0     950  25      9    1     950  25
PR. GEORGE   P.G.      9    1     700  10     26    2     850  10
SMITHERS     P.G.      9    1     500   0      9    1     500   0
WELLS GRAY   P.G.      9    0     950  25      9    2    1000  25
FT NLSN      F.N.      9  -16     750   0     19  -15     800   3
FT STJOHN    F.N.     31   -7    1100   6     44   -1    1250   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
PR. GEORGE            W   59   W   67
SMITHERS              SW  61   W   67

TODAY'S VENTING: POOR.

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    4     100   1     10    6     200   1
FRASER VLY   QUIL      9    4      50   1     10    7     200   1
SRN VRISL    QUIL      9    6     150   0      9    8     200   0
CNTRL VRISL  QUIL      9    4     100   0      9    6     150   0
NRN VRISL    HRDY      9    6     100   0     19    8     300   4
TERRACE      ANT       9    2     200  15      9    2     200  15
STEWART      ANT       9    2       0   2      9    2       0   2

*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    SW   9   W   33   W   46
PORT HARDY   SW  30   W   39   W   52
SANDSPIT     SW  41   W   46   W   48

TODAY'S VENTING: POOR.

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