FPCN39 CWLW 011431
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 THURSDAY 1 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      28    3     300  10     43    4     500  10
KAMLOOPS     KEL      15    3     550   3     39    4     700  10
OKANAGAN     KEL      13    2     450   3     25    3     550  10
CASTLEGAR    SPOK     25    3     750   7     25    3     750   7
CRANBROOK    SPOK      9    6     940  10     17    5    1050  10
REVELSTOKE   KEL      73    4    1300  11     50    4    1000  11

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   20   W   43
CRANBROOK             SW  28   SW  63

TODAY'S VENTING: Poor locally fair in Kamloops and Revelstoke
 areas.

VENTING FOR FRIDAY: Fair to 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.     92   -5    1950  14     92   -5    1950  14
PR. GEORGE   P.G.     65  -14    1150  17     68  -13    1200  17
SMITHERS     P.G.     68  -12    1150  13     74  -10    1250  13
WELLS GRAY   P.G.     73   -9    1650  15     73   -9    1650  15
FT NLSN      F.N.     57  -25     950  11     57  -25     950  11
FT STJOHN    F.N.     49  -25    1150  11     65  -22    1350  11

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            N   26   NW  33
SMITHERS              N   15   N   33

TODAY'S VENTING: Good except fair east of the Rockies.

VENTING FOR FRIDAY: Poor north. Fair south.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    6     100  17      9    8     100  17
FRASER VLY   QUIL      9    8      50  17     32    9     400  12
SRN VRISL    QUIL     16    8     100   9     31    9     300   9
CNTRL VRISL  QUIL      9    3      50   9      9    5      50   9
NRN VRISL    HRDY     12    2     100   3    100    5    1650  12
TERRACE      ANT       9   -4     200  17      9   -2     200  17
STEWART      ANT      13   -1      50   6      9   -2       0   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  31   NW  30   NW  24
PORT HARDY   NW  37   N   44   N   52
SANDSPIT     NW  26   NW  30   N   31

TODAY'S VENTING: Poor locally fair.

VENTING FOR FRIDAY: Fair.


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


END/kal