FPCN39 CWLW 301400
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 FRIDAY 30 APRIL 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   11     650   2     55   21    2300   4
KAMLOOPS     KEL      16   11     700   2     57   20    3350   2
OKANAGAN     KEL      16   11     700   2     57   21    3350   2
CASTLEGAR    SPOK     64   13    1700   6    100   20    2850   9
CRANBROOK    SPOK     52    8    1600   8     84   14    2400   8
REVELSTOKE   KEL      14   10     700   2     57   19    3450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  13   SW  22
CRANBROOK             VR   5   W   15

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: 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    7     950  20    100   15    3950  13
PR. GEORGE   P.G.     18    6     900   5     67   14    1350  12
SMITHERS     P.G.     17    8     900   2     59   13    1050   8
WELLS GRAY   P.G.     ##   ##     ###  ##    100   15    4000  13
FT NLSN      F.N.     24    9     750   4     91   16    2200   8
FT STJOHN    F.N.     22    6     800  16     86   13    2200   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   22   SW  26
SMITHERS              S   20   SW  26

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     36   11     450   8     68   15    1050   9
FRASER VLY   QUIL     36   11     450   8     99   19    1700  10
SRN VRISL    QUIL     13   11     400   1     75   17    1300   8
CNTRL VRISL  QUIL     14   12     550   1     75   17    1300   8
NRN VRISL    HRDY     22   11     200   8     82   13     800  15
TERRACE      ANT     100   10    1250  32    100   13    1900  33
STEWART      ANT     100    9     800  22    100   13    1400  27

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   15   S   26   SW  33
PORT HARDY   S   30   S   43   S   46
SANDSPIT     S   17   S   19   S   24

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: GOOD




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


END/
$$$$^^