FPCN39 CWLW 191400
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 19 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   KEL      30   20     600  8      86   28    3500   15
KAMLOOPS     KEL      25   18     400  2      76   28    3350    3
OKANAGAN     KEL      25   18     400  2      76   28    3350    3
CASTLEGAR    SPOK     25   17     500  5      98   26    2750    7
CRANBROOK    SPOK     40   16    1000  5     100   23    3950    8
REVELSTOKE   KEL      24   16     400  2     76    25    3450    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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   13   W   24
CRANBROOK             W    9   W   19

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: 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.     80   15     3500   6   100   27    3950  10
PR. GEORGE   P.G.     30   16      900   5   100   25    3700  10
SMITHERS     P.G.     30   16      800   5   100   25    3500   8
WELLS GRAY   P.G.     80   15     3500   6   100   27    4000  10
FT NLSN      F.N.     12   18      400   8   100   24    1650  14
FT STJOHN    F.N.     50   17      900  11   100   25    3700  22

*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            W   19   W   20
SMITHERS              W   24   W   20

TODAY'S VENTING: GENERALLY GOOD.

VENTING FOR TUESDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     35   16     400   3     65   21    1250   6
FRASER VLY   QUIL     33   18     350   3     61   25    1200   6
SRN VRISL    QUIL     20   17     400   1     60   21    1250   3
CNTRL VRISL  QUIL     20   19     400   3     40   25    1200   3
NRN VRISL    HRDY     15   12     200   2     37   15     650   5
TERRACE      ANT      30   18     600   5     98   23    1450  14
STEWART      ANT      30   18     600   3     89   23    1250  11

*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    SW  11   W   15   W   17
PORT HARDY   NW  28   N   33   NW  28
SANDSPIT     W   26   W   37   W   43

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR TUESDAY: GOOD.

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

END/GF
$$$$^^