FPCN39 CWLW 031400
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 TUESDAY 3 AUGUST 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      29   25     650   5     74   34    1800   6
KAMLOOPS     KEL      23   24     700   5     98   34    3350   6
OKANAGAN     KEL      21   23     600   5     74   33    1950   6
CASTLEGAR    SPOK      9   23     500   3    100   33    1700  14
CRANBROOK    SPOK      9   22     950  21     97   30    2150  13
REVELSTOKE   KEL      17   22     600   5     51   29    1400   5

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   E   13   E    9
CRANBROOK             VR   5   E   11

TODAY'S VENTING:  GOOD LOCALLY FAIR

VENTING FOR WEDNESDAY: 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   19     950   4    100   28    3950   7
PR. GEORGE   P.G.      9   17     700   5     51   26    1850   4
SMITHERS     P.G.     11   17     750   1     50   26    1850   4
WELLS GRAY   P.G.      9   19     950   4    100   28    4000   7
FT NLSN      F.N.     16   21     500   5     27   29     750   5
FT STJOHN    F.N.      9   17     700   3      9   26     700   3

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   VR   5
SMITHERS              SE  15   SE   5

TODAY'S VENTING: GOOD TO FAIR EXCEPT POOR IN THE NORTHEAST

VENTING FOR WEDNESDAY: GOOD TO FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     38   20     650   6     50   24     900   6
FRASER VLY   QUIL     41   21     700   6     90   29    1600   9
SRN VRISL    QUIL     34   18     550   5     47   24     850   5
CNTRL VRISL  QUIL     38   21     700   5     55   25    1050   6
NRN VRISL    HRDY     10   15     200   1     19   20     550   3
TERRACE      ANT      16   22     700   2    100   30    3200  12
STEWART      ANT      14   20     500   1     51   30    1500   3

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   E   22   SE  24
PORT HARDY   VR   5   SE  41   SE  52
SANDSPIT     S   11   SE  43   SE  56

TODAY'S VENTING: GOOD TO FAIR EXCEPT POOR NORTHERN VANCOUVER ISLAND

VENTING FOR WEDNESDAY: GOOD

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

END/ret
$$$$^^