FPCN39 CWLW 051340
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 5 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    2     200   0      9    4     500   0
KAMLOOPS     KEL       9    1     350   0     27    3     850   4
OKANAGAN     KEL       9    1     350   0     27    3     850   4
CASTLEGAR    SPOK      9    0     500   3     16    1     750   3
CRANBROOK    SPOK      9   -6     950   5     14   -2    1050   5
REVELSTOKE   KEL       9   -1     450   0      9    0     450   0

*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    W   13   W   39   NW  72
CRANBROOK             W   24   W   78

TODAY'S VENTING: POOR.

VENTING FOR WEDNESDAY: POOR.


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.     10    1     950  21     10    2     950  21
PR. GEORGE   P.G.      9    2     700  14      9    2     700  14
SMITHERS     P.G.      9    0     500   1      9    1     500   1
WELLS GRAY   P.G.     10    1    1000  21     10    2    1000  21
FT NLSN      F.N.     77  -19    1050  15     83  -18    1200  14
FT STJOHN    F.N.     82  -16    1450  15     89  -14    1550  16

*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            N   26   W   65
SMITHERS              W   33   W   65

TODAY'S VENTING: POOR EXCEPT GOOD IN THE NORTHEAST.

VENTING FOR WEDNESDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    5     100  10      9    7     100  10
FRASER VLY   QUIL      9    5      50  10      9    7      50  10
SRN VRISL    QUIL     11    5     100   3     13    8     150   3
CNTRL VRISL  QUIL     11    5     100   3     12    7     150   3
NRN VRISL    HRDY      9    7       0   7     32    8     300   9
TERRACE      ANT       9    3     200   9      9    3     200   9
STEWART      ANT       9    3       0   7      9    3       0   7

*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    SW  11   W   28   W   48
PORT HARDY   S   28   W   31   W   54
SANDSPIT     SW  20   SW  26   SW  24

TODAY'S VENTING: POOR.

VENTING FOR WEDNESDAY: FAIR.


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


END/MWSO