FPCN39 CWLW 091400
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 SUNDAY 9 MAY 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      30    9    1300   2    100   15    3200  13
KAMLOOPS     KEL      30    8    1500   2    100   14    3350   8
OKANAGAN     KEL      20    6     900   2    100   14    3350   8
CASTLEGAR    SPOK     37    6    1400   4    100   14    3500   8
CRANBROOK    SPOK     43    3    2000   4    100    9    3950   8
REVELSTOKE   KEL      18    5     900   2    100   13    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  13   N   17
CRANBROOK             NE   9   E   24

TODAY'S VENTING: BECOMING GOOD BY THIS AFTERNOON.

VENTING FOR MONDAY: 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.    100    4    3950  15    100    9    3950  17
PR. GEORGE   P.G.     52    3    1150  12    100    9    3700  16
SMITHERS     P.G.     32    3     850   8    100    9    3500  14
WELLS GRAY   P.G.    100    1    4000  15    100   10    4000  17
FT NLSN      F.N.      9    3     400   4     61    6    1200   8
FT STJOHN    F.N.     69    5    1700   9    100    9    2700   9

*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            SW   9   SW  17
SMITHERS              W    9   VR  17

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     85    8    1500   9    100   12    2750   9
FRASER VLY   QUIL     80    8    1300   9    100   12    2500   9
SRN VRISL    QUIL     53    7     900   6    100   12    2400   9
CNTRL VRISL  QUIL     69    8    1200   7    100   13    2800   9
NRN VRISL    HRDY     11    5     100   2     72   11    2400   4
TERRACE      ANT      86    7    1350  11    100   13    3200   8
STEWART      ANT      71    8    1000   9    100   13    2750   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   SE   9
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     S   20   S   11   VR   5

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: FAIR TO GOOD.




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


END/MWSO
$$$$^^