FPCN39 CWLW 051320
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 MONDAY 5 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      15    6    1800   1     83   12    2800   1
KAMLOOPS     KEL      22    7    1650   1     86   12    3350   1
OKANAGAN     KEL      13    4    1700   1     86   12    3350   1
CASTLEGAR    SPOK     27    6    1800   8     96   10    3500   5
CRANBROOK    SPOK     25    5    1950   5     95    9    3950   5
REVELSTOKE   KEL      17    5    1250   1     50    9    2650   1

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   NE   9
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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.     60    3    2700  10    100    8    3950  12
PR. GEORGE   P.G.     92    3    1950  12    100    8    3700  12
SMITHERS     P.G.     28    1     800   7    100    8    2750  10
WELLS GRAY   P.G.     25    0     900   7    100    8    4000  12
FT NLSN      F.N.     19    0     400   2    100    4    1950  17
FT STJOHN    F.N.     55    0    1850  18    100    3    2550  15

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  17   NW  17
SMITHERS              W   15   NW  17

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    6     100  26    100   12    2600  18
FRASER VLY   QUIL     52    6     350  19    100   12    2600  17
SRN VRISL    QUIL     59    7     450  16    100   12    2500  16
CNTRL VRISL  QUIL     60    7     450  16    100   11    1650  16
NRN VRISL    HRDY     11    5     100   3     64    9    1200   6
TERRACE      ANT      10    3     250  13     50    8    1250  13
STEWART      ANT       9    2     250   7     52    8    1200   7

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    N   11   NE  13   E   19
PORT HARDY   N   24   N   24   N   31
SANDSPIT     NW  28   NW  33   NW  43

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR TUESDAY: FAIR

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


END/MWSO