FPCN39 CWLW 031416
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 3 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      24    6     950   2     37    9    1750   2

KAMLOOPS     KEL      28    6    1350   2     41    9    2200   2

OKANAGAN     KEL      24    5    1100   2     41    9    2150   2

CASTLEGAR    SPOK     92    5    1450  15    100    8    2200  19

CRANBROOK    SPOK    100    4    2300  24    100    7    3950  22

REVELSTOKE   KEL      31    6    1600   2     40    8    2150   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    NW  11   N   17   N   19
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: POOR BECOMING FAIR THIS AFTERNOON EXCEPT GOOD
SOUTHEAST.




VENTING FOR SUNDAY: FAIR




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    2    2100  20    100    7    3950  17

PR. GEORGE   P.G.     97    2    1300  26    100    6    2500  20

SMITHERS     P.G.     47    1     800  15    100    6    2100  19

WELLS GRAY   P.G.     ##   ##     ###  ##    100    7    4000  17

FT NLSN      F.N.      9    4     400  10     88    6     950  23

FT STJOHN    F.N.      9    1     700  28      9    2     700  28


*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            N   26   N   22
SMITHERS              NW   9   VR  22

TODAY'S VENTING: GOOD EXCEPT POOR FORT NELSON THIS MORNING AND POOR
THROUGH THE DAY FOR ST JOHN.




VENTING FOR SUNDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    6    1300  28    100    9    2650  27

FRASER VLY   QUIL    100    6    1000  28    100    9    2600  27

SRN VRISL    QUIL     62    6     350  21    100   10    2750  26

CNTRL VRISL  QUIL    100    7    1650  27    100   10    2750  26

NRN VRISL    HRDY    100    6    1450  24    100    8    2350  27

TERRACE      ANT      90    2    1250  14    100    7    3200  13

STEWART      ANT      ##   ##     ###  ##    100    7    2000  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  24   NW  17   N    9
PORT HARDY   NW  44   N   44   N   37
SANDSPIT     NW  24   NW  30   NW  33

TODAY'S VENTING: GOOD.




VENTING FOR SUNDAY: FAIR




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


END/