FPCN39 CWLW 201532
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 WEDNESDAY 20 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       9    3     200   2     22    5     500   4
KAMLOOPS     KEL       9    2     350   2     15    4     500   4
OKANAGAN     KEL       9    2     350   2     17    4     500   4
CASTLEGAR    SPOK      9    3     500   4     19    4     750   4
CRANBROOK    SPOK      9    0     950   8      9    2     950   8
REVELSTOKE   KEL       9    2     500   2     11    3     500   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S    9   S   20
CRANBROOK             SW   9   SW  24

TODAY'S VENTING: POOR

VENTING FOR THURSDAY: 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.     47   -4    1600   6     43   -2    1600   6
PR. GEORGE   P.G.      9   -9     700   7      9   -8     700   7
SMITHERS     P.G.      9   -9     550   0      9   -8     550   3
WELLS GRAY   P.G.     31   -6    1400   6     41   -2    1600   6
FT NLSN      F.N.      9  -17     400   3      9  -16     400   3
FT STJOHN    F.N.     15  -16     850   4     17  -16     850   5

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   W   22
SMITHERS              E   22   NE  22

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR THURSDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10    7     100  10     51    8     500  12
FRASER VLY   QUIL     10    6      50  10     52    8     500  12
SRN VRISL    QUIL     10    7     100   8     45    9     550   8
CNTRL VRISL  QUIL     15    7     100   8     42    8     500   8
NRN VRISL    HRDY     10    4     100   1     19    5     300   4
TERRACE      ANT      10   -6     220  15     16   -4     250  20
STEWART      ANT       9   -6      20   8     12   -4      50   8

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   11   S   17   S   26
PORT HARDY   SW  13   S   19   S   20
SANDSPIT     N   41   NE  37   NE  31

TODAY'S VENTING: FAIR SOUTH TO POOR NORTH

VENTING FOR THURSDAY: POOR

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


END/MWSO