FPCN39 CWLW 021400
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 2 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      20   10     600   8     80   14    2650  11
KAMLOOPS     KEL      13    6     600   3     80   15    3350  10
OKANAGAN     KEL      13    6     550   2     80   13    2800  10
CASTLEGAR    SPOK     17    6     600   2     80   12    2050   5
CRANBROOK    SPOK     33    4     800   5    100   11    3950  17
REVELSTOKE   KEL      12    7     600   2    100   10    2350  10

*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  19   SW  43
CRANBROOK             SW  15   SW  37

TODAY'S VENTING: POOR THIS MORNING BECOMG GOOD 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.     12    6     750   3    100   13    3950   6
PR. GEORGE   P.G.     12    7     800   6    100   11    3700   5
SMITHERS     P.G.     11    6     650   1     98    9    1900   4
WELLS GRAY   P.G.      9    2     800   3    100   14    4000  10
FT NLSN      F.N.      9    7     400   4     35   13     950   5
FT STJOHN    F.N.      9    9     700   7     77   12    2050   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
PR. GEORGE            SW  31   SW  44
SMITHERS              SW  24   W   44

TODAY'S VENTING: GOOD BY LATE MORNING.


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    100    9     950  23    100   12    1550  22
FRASER VLY   QUIL    100    9     900  23    100   11    1250  22
SRN VRISL    QUIL     92    9     800  18    100   12    1350  19
CNTRL VRISL  QUIL    100   10    1000  19    100   13    1700  19
NRN VRISL    HRDY     24    8     350   5     86   10    1350  10
TERRACE      ANT     100    6    2200  14    100    9    3200  14
STEWART      ANT     100    7    1550  12    100    9    2350  13

*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    SW  22   SW  31   SW  31
PORT HARDY   W   20   W   31   W   44
SANDSPIT     W   26   W   28   W   26

TODAY'S VENTING: GOOD THROUGH THE DAY EXCEPT VANCOUVER ISLAND
WHICH IS POOR IN THE MORNING.


VENTING FOR MONDAY: GOOD


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


END/LM
$$$$^^