FPCN39 CWLW 301428
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 30 DECEMBER 1997 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    6     550   0     31    8     900   3
KAMLOOPS     KEL       9    3     500   0     13    5     650   2
OKANAGAN     KEL       9    3     500   0     25    6     850   3
CASTLEGAR    SPOK     19    3     750   4     19    4     750   4
CRANBROOK    SPOK      9    1     950  15     25    4    1050  15
REVELSTOKE   KEL       9    1     450   0      9    2     500   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    SW   9   W   26   W   44
CRANBROOK             W   17   W   57

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  26     89    3    1450  26
PR. GEORGE   P.G.     47    2    1000  14     59    3    1150  14
SMITHERS     P.G.     22    1     750   7     54    4    1050  10
WELLS GRAY   P.G.     91    3    1550  27     98    4    1600  27
FT NLSN      F.N.      9  -18     400   2      9  -16     400   2
FT STJOHN    F.N.      9    0     700   2      9    1     700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   59   W   91
SMITHERS              SW  57   SW  91

TODAY'S VENTING: Good in the afternoon except poor east of the Rockies.

VENTING FOR WEDNESDAY: Fair.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     28   10     400   7     50   12     800   7
FRASER VLY   QUIL     27   10     350   7     38   11     550   7
SRN VRISL    QUIL     41   12     650   6     71   14    1250   7
CNTRL VRISL  QUIL      9    9      50   1     29   11     500   5
NRN VRISL    HRDY      9    8       0   6     24    9     300   6
TERRACE      ANT       9    2     200  40     11    5     250  40
STEWART      ANT       9    6       0  15      9    5       0  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   W   28   W   52
PORT HARDY   SW  46   SW  54   SW  67
SANDSPIT     W   41   W   56   SW  82

TODAY'S VENTING: Fair in the south and poor in the north.

VENTING FOR WEDNESDAY: Fair.


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


END/kal