FPCN39 CWLW 121400
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 PDT SATURDAY 12 JUNE 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      42   18     950   5     84   28    3200   4
KAMLOOPS     KEL      42   18    1100   5     84   27    3350   4
OKANAGAN     KEL      19   16     850   2     84   26    3350   4
CASTLEGAR    SPOK     25   15     850   5    100   25    3500  10
CRANBROOK    SPOK      9   15     950  12    100   23    3950  11
REVELSTOKE   KEL      15   14     750   2     84   24    3450   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    VR   5   SE  17   S   22
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD


VENTING FOR SUNDAY: GOOD




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   15     950  20    100   22    3950   7
PR. GEORGE   P.G.     23   13     800  12     85   20    1450  12
SMITHERS     P.G.     24   15     850   5    100   23    2700   8
WELLS GRAY   P.G.     50   16    1000  10    100   24    4000  12
FT NLSN      F.N.     45   14    1350   4     97   20    2500   8
FT STJOHN    F.N.     88   14    2100  10    100   20    3700   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  17   SE  22
SMITHERS              SE  33   SE  22

TODAY'S VENTING: GOOD


VENTING FOR SUNDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     59   18     650  12     79   23     950  12
FRASER VLY   QUIL     70   21     800  12    100   28    1850  17
SRN VRISL    QUIL     22   17     300   5     70   22     850  10
CNTRL VRISL  QUIL     22   17     300   5     73   23     900  10
NRN VRISL    HRDY     34   18     200  14     53   20     350  16
TERRACE      ANT       9   17     200   8    100   24    1650  13
STEWART      ANT      13   16     150   3     64   24     950   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  17   SE  37   SE  50
PORT HARDY   SE  67   SE  91   S   80
SANDSPIT     SE  98   SE  91   SE  80

TODAY'S VENTING: GOOD EXCEPT FAIR OVER NORTHERN VANCOUVER ISLAND.


VENTING FOR SUNDAY: GOOD




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


END/LM
$$$$^^