FPCN39 CWLW 201331
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 20 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     200   4     25    5     600   4
KAMLOOPS     KEL       9    2     350   4     17    3     550   4
OKANAGAN     KEL       9    2     350   4     17    3     550   4
CASTLEGAR    SPOK     32    2     750   9     36    3     800   9
CRANBROOK    SPOK      9    0     950  17      9    0     950  17
REVELSTOKE   KEL       9    0     450   4      9    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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   W   22
CRANBROOK             NW  11   NW  30

TODAY'S VENTING: poor.

VENTING FOR WEDNESDAY: 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.     55   -1    1600   9     54   -1    1600   9
PR. GEORGE   P.G.     19   -9    1100   3     28   -5    1300   3
SMITHERS     P.G.     32   -2    1350   3     30   -4    1300   3
WELLS GRAY   P.G.     38   -4    1500   7     51   -2    1600   9
FT NLSN      F.N.     28  -22     900   4     30  -21    1050   4
FT STJOHN    F.N.     26  -21    1200   4     30  -20    1250   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  15   SW  22
SMITHERS              S   24   S   22

TODAY'S VENTING: poor to fair.

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     88    8     750  19    100    9    1050  19
FRASER VLY   QUIL     55    6     350  19     85    8     700  19
SRN VRISL    QUIL     22    7     450   3     99   10    1100  15
CNTRL VRISL  QUIL     22    7     500   3     22    7     500   3
NRN VRISL    HRDY      9    7       0   9     29    8     250   9
TERRACE      ANT       9    0     200  13      9    1     200  13
STEWART      ANT       9    4      50   1      9    1       0   1

*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    S   20   S   26   SW  28
PORT HARDY   S   33   S   35   SW  35
SANDSPIT     S   30   S   28   S   26

TODAY'S VENTING: good south to poor 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/dsl