FPCN39 CWLW 101452
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 WEDNESDAY 10 MARCH 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      16    4     550   2     32    8    1400   2
KAMLOOPS     KEL      13    3     550   2     32    7    1550   2
OKANAGAN     KEL      18    4     750   2     30    8    1800   2
CASTLEGAR    SPOK     25    3     950   3     50    7    2100   8
CRANBROOK    SPOK     32    1    1450   6     80    5    3950   8
REVELSTOKE   KEL      11    2     550   2     27    5    1350   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   11   SW  15
CRANBROOK             VR   5   W    9

TODAY'S VENTING: GENERALLY POOR. EXCEPT RISING TO FAIR TO GOOD OVER
THE SOUTHEAST.

VENTING FOR THURSDAY: 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.      9    0     950   7     40    4    1400  10
PR. GEORGE   P.G.     17   -2     750   2     24    4     900  12
SMITHERS     P.G.     21   -1     750   6     30    5     900   7
WELLS GRAY   P.G.     24   -4    1400   8     85    4    1950  13
FT NLSN      F.N.      9   -6     600   0     32    4     800   7
FT STJOHN    F.N.      9   -3     700   5     23    1     800   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   S   35
SMITHERS              SE  26   S   35

TODAY'S VENTING: GENERALLY POOR EXCEPT RISING TO FAIR THIS AFTERNOON
AT WILLIAMS LAKE AND GOOD AT WELLS GRAY.

VENTING FOR THURSDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     90    7     900  17    100   10    1750  19
FRASER VLY   QUIL     36    7     850   4    100   10    1650  12
SRN VRISL    QUIL    100    8    1000  10    100   10    1550  17
CNTRL VRISL  QUIL    100    6    1000  20    100   10    1600  15
NRN VRISL    HRDY     96    6     750  15    100    8    1200  12
TERRACE      ANT      18    1     400   9     48    4     600  12
STEWART      ANT       9   -1     200   2     24    3     400   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  19   S   22   S   22
PORT HARDY   S   26   S   39   S   44
SANDSPIT     S   33   S   35   S   30

TODAY'S VENTING: FAIR TO GOOD OVER MOST AREAS. EXCEPT POOR OVER THE
NORTHWEST RISING TO FAIR THIS AFTERNOON AT TERRACE.

VENTING FOR THURSDAY: FAIR

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


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