FPCN39 CWLW 221337
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 22 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    2     450   0     29    4    1000   5
KAMLOOPS     KEL       9    2     500   0     36    4    1000   8
OKANAGAN     KEL       9    0     450   0     23    2     800   4
CASTLEGAR    SPOK     23    2     750   6     40    4    1050   6
CRANBROOK    SPOK     10   -1     950   3     22    0    1050   6
REVELSTOKE   KEL       9    1     500   0     17    1     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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   SW  28
CRANBROOK             VR   5   W   19

TODAY'S VENTING: fair to poor

VENTING FOR FRIDAY: 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.      9   -3     950   5     24   -2    1050  10
PR. GEORGE   P.G.     13   -3     800   3     24   -2     850   6
SMITHERS     P.G.     11   -3     700   1     25    0     900   2
WELLS GRAY   P.G.      9   -3    1000   6     29   -1    1000  11
FT NLSN      F.N.     19  -20     900   6     22  -20     900   8
FT STJOHN    F.N.     19  -19    1200  10     30  -17    1300  10

*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            S   26   S   20
SMITHERS              SE  37   S   20

TODAY'S VENTING: poor

VENTING FOR FRIDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    6     100   6     44    8     450  14
FRASER VLY   QUIL      9    6      50   5     40    8     400  14
SRN VRISL    QUIL      9    8     300   5     36    9     550  10
CNTRL VRISL  QUIL      9    4      50   5     30    6     300   5
NRN VRISL    HRDY      9    4     100   5     46    8     450  14
TERRACE      ANT       9   -1     200   5     30    0     300  15
STEWART      ANT       9    1       0   5     27    2     100  10

*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    SE  44   S   44   SW  72
PORT HARDY   SE  80   S   78   S   52
SANDSPIT     SE  80   SE  69   S   48

TODAY'S VENTING: fair to poor.

VENTING FOR FRIDAY: POOR

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


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