FPCN39 CWLW 011424
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 THURSDAY 1 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      14    5     600   1     98   13    2350   8

KAMLOOPS     KEL      14    5     800   1    100   13    3350  10

OKANAGAN     KEL       9    3     600   0    100   12    2850   9

CASTLEGAR    SPOK     21    5     900   3    100   13    3500  11

CRANBROOK    SPOK     10    3     950  15    100   10    3950  12

REVELSTOKE   KEL      13    4     800   1    100   11    2850   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N    9   NE  15
CRANBROOK             NE   9   NE  19

TODAY'S VENTING: POOR THIS MORNING. GOOD LATER THIS AFTERNOON.




VENTING FOR FRIDAY: FAIR TO 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    0     950  11    100    7    3950  15

PR. GEORGE   P.G.     19    1     800   8    100    7    2500  12

SMITHERS     P.G.     14    1     750   2     85    7    1950   9

WELLS GRAY   P.G.     ##   ##     ###  ##    100    7    4000  15

FT NLSN      F.N.     30   -2     650   8     47    6     850   9

FT STJOHN    F.N.     20    1     800  12    100    6    3700  12


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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  28   W   33
SMITHERS              SW  33   W   33

TODAY'S VENTING: POOR THIS MORNING. GOOD LATER THIS AFTERNOON EXCEPT
FAIR FORT NELSON.




VENTING FOR FRIDAY: FAIR TO GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     22    6     250   8     76   12    1250   9

FRASER VLY   QUIL     41    8     400  11    100   14    3050   9

SRN VRISL    QUIL     23    7     250   6     81   13    1450   8

CNTRL VRISL  QUIL     22    7     250   6    100   14    3050   9

NRN VRISL    HRDY     10    4      50   2     39   10    1050   3

TERRACE      ANT      10    3     200  20    100    7    1550  23

STEWART      ANT      ##   ##     ###  ##     66    7     550  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    N   11   N   13   NE  15
PORT HARDY   SW  13   SW  22   W   17
SANDSPIT     S   65   SW  52   SW  57

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




VENTING FOR FRIDAY: FAIR TO GOOD




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


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