FPCN39 CWLW 271400
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 27 JULY 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   QUIL     37   24     950   4     95   32    3200   5
KAMLOOPS     SPOK     28   22     800   5     85   32    1550   5
OKANAGAN     SPOK     27   21     750   5     85   33    1900   5
CASTLEGAR    SPOK     22   21     800   5     67   32    2100   5
CRANBROOK    SPOK      9   21     950   5    100   32    3950   8
REVELSTOKE   KEL      10   17     500   2     75   25    1250   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  24   W   46
CRANBROOK             W   19   W   44

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON




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.     11   17     950  29    100   24    3950  31
PR. GEORGE   P.G.     47   18    1000  16    100   21    2100  24
SMITHERS     P.G.      9   14     500   3     12   17     600   3
WELLS GRAY   P.G.      9   15     300   3    100   24    4000  31
FT NLSN      F.N.      9   11     400   0     60   10    1000  10
FT STJOHN    F.N.     82   18    1550  13    100   21    2850  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   46   W   56
SMITHERS              SW  31   W   56

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON EXCEPT REMAINING
POOR IN THE SMITHERS AREA.




VENTING FOR WEDNESDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     24   18     450   5     34   22     650   5
FRASER VLY   QUIL     28   20     500   5     66   29    1900   4
SRN VRISL    QUIL     26   18     450   4     38   24     750   5
CNTRL VRISL  QUIL     28   20     500   4     46   26    1100   4
NRN VRISL    HRDY     30   15     500   5     34   19     650   4
TERRACE      ANT      73   15     900  13    100   18    1500  21
STEWART      ANT      39   14     300  11     98   18    1100  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW   9   SW  20   SW  39
PORT HARDY   SW  11   SW  30   SW  35
SANDSPIT     W   22   W   24   W   31

TODAY'S VENTING: FAIR EXCEPT GOOD ALONG THE NORTH COAST.




VENTING FOR WEDNESDAY: GOOD




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