FPCN39 CWLW 231421
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 SATURDAY 23 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      65   -1     650  15     67   -1    1490  13
KAMLOOPS     KEL      67   -4     750  20     64   -3    1450  12
OKANAGAN     KEL       9   -2     350   1     62    0    1550  13
CASTLEGAR    SPOK      9    1     500  11     35    1     850  11
CRANBROOK    SPOK      9   -4     950  21     10   -3     950  21
REVELSTOKE   KEL       9   -2     450   1      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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    N    9   N   22   NE  41
CRANBROOK             NE  15   NE  30

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: 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.     10  -16     950  14     61  -14    1400  14
PR. GEORGE   P.G.      9  -20     700  15     54  -16    1050  16
SMITHERS     P.G.      9  -22     500   3      9  -18     500   3
WELLS GRAY   P.G.     ##   ##     ###  ##     53  -14    1500  11
FT NLSN      F.N.      9  -26     400   3     14  -21     550   3
FT STJOHN    F.N.      9  -27     700  10      9  -24     700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   17   NE  33
SMITHERS              SE  17   N   33

TODAY'S VENTING: GOOD CENTRAL INTERIOR. POOR ELSEWHERE.

VENTING FOR SUNDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    5     100  13      9    5     100  13
FRASER VLY   QUIL     15    5     200   4     17    6     250   4
SRN VRISL    QUIL     17    6     250   4     17    6     250   4
CNTRL VRISL  QUIL     15    5     200   4     16    6     250   4
NRN VRISL    HRDY     11    2      50   4     13    3     100   4
TERRACE      ANT       9  -10     200  14      9   -8     200  14
STEWART      ANT      ##   ##     ###  ##      9   -8       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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NE  31   NE  35   N   26
PORT HARDY   NE  19   NE  26   NE  43
SANDSPIT     N   15   NW  19   NW  24

TODAY'S VENTING: POOR

VENTING FOR SUNDAY: FAIR


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


END/MWSO