FPCN39 CWLW 061423
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 6 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      18    3     650   2     57   10    3200   2

KAMLOOPS     KEL      21    3     950   2     57   10    3350   2

OKANAGAN     KEL      17    2     750   2     57   10    3350   2

CASTLEGAR    SPOK     38    2    1000   7     73    5    1750   7

CRANBROOK    SPOK      9   -1     950  10     85    3    2850   7

REVELSTOKE   KEL      15    1     750   2     34    5    1750   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SE  15   SE  26
CRANBROOK             SE   9   SE  20

TODAY'S VENTING: POOR THIS MORNING. GENERALLY GOOD THIS AFTERNOON.




VENTING FOR SUNDAY: FAIR TO GOOD IN THE AFTERNOON.




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.     53   -2    2300   7    100    2    3950   9

PR. GEORGE   P.G.     23   -2    1100   4     63    1    2100   5

SMITHERS     P.G.     21   -1    1000   3     55    2    1800   4

WELLS GRAY   P.G.     ##   ##     ###  ##    100    2    4000   9

FT NLSN      F.N.     48  -16     800  12     79  -13    1200  13

FT STJOHN    F.N.     50  -11    1800  17    100   -9    1850  17


*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            S   15   S   24
SMITHERS              SE  19   S   24

TODAY'S VENTING: GENERALLY POOR THIS MORNING BECOMING GOOD THIS
AFTERNOON.




VENTING FOR SUNDAY: FAIR TO GOOD BY AFTERNOON.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     22    4     350   5     69    9    1900   5

FRASER VLY   QUIL     22    4     300   5     57    8    1450   4

SRN VRISL    QUIL      9    5     400   0     59    9    1700   4

CNTRL VRISL  QUIL      9    5     400   0     60    9    1750   4

NRN VRISL    HRDY     27    4     300   7     61    6     750  10

TERRACE      ANT       9    0     200  24    100    3    1000  23

STEWART      ANT      ##   ##     ###  ##     52    3     300  19


*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    VR   5   VR   5   VR   5
PORT HARDY   S   17   S   19   S   15
SANDSPIT     S   26   S   33   S   37

TODAY'S VENTING: POOR THIS MORNING. FAIR TO GOOD THIS AFTERNOON.




VENTING FOR SUNDAY: POOR TO FAIR.




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


END/TCS