FPCN39 CWLW 211330
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 SUNDAY 21 MARCH 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      16    9     550   2     26   15    1050   2
KAMLOOPS     KEL      13    7     550   2     25   15    1200   2
OKANAGAN     KEL      13    7     550   2     25   15    1200   2
CASTLEGAR    SPOK      9    6     500   0      9   13     800   0
CRANBROOK    SPOK      9    8     950  14     53   16    1500  10
REVELSTOKE   KEL      10    5     500   2     18   11     850   2

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW   9   S   24
CRANBROOK             SE  13   SE  35

TODAY'S VENTING: GENERALLY POOR.

VENTING FOR MONDAY: GENERALLY 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.      9    8     950  11     47   14    1350  11
PR. GEORGE   P.G.     15    6     800   6     29   14    1000   7
SMITHERS     P.G.     11    4     650   2     19    9     900   3
WELLS GRAY   P.G.      9    7    1000   2     53   14    1450  13
FT NLSN      F.N.      9    1     400   1     12    8     650   1
FT STJOHN    F.N.      9    4     700   5     15    9     800   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   S   44
SMITHERS              S   26   S   44

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR MONDAY: GENERALLY FAIR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   11    1000  34    100   13    1450  30
FRASER VLY   QUIL    100   11     950  34    100   13    1400  32
SRN VRISL    QUIL    100   11     850  21    100   13    1300  26
CNTRL VRISL  QUIL    100   11     850  21    100   13    1350  26
NRN VRISL    HRDY     12    9     100   3     27   11     550   4
TERRACE      ANT       9    5     200   4     31    7     350  21
STEWART      ANT       9    5      50   4     14    7     150   3

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   17   SW  28   S   39
PORT HARDY   SE  46   S   67   S   76
SANDSPIT     S   48   S   48   S   52

TODAY'S VENTING: GOOD SOUTH TO POOR NORTH.

VENTING FOR MONDAY: GENERALLY FAIR.


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


END/MWSO