FPCN39 CWLW 161400
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 FRIDAY 16 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       9   17     200  10    100   23    3200   7
KAMLOOPS     KEL       9   17     400   5    100   23    3350   7
OKANAGAN     KEL       9   19     400   5    100   23    3350   7
CASTLEGAR    SPOK      9   17     500   2    100   24    2500  16
CRANBROOK    SPOK      9   15    1000   2    100   22    3950  17
REVELSTOKE   KEL       9   15     500   4    100   22    3450   7

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    E   11   E   20   E   28
CRANBROOK             E    9   SE  19

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: 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   10    1000   2    100   20    3950  11
PR. GEORGE   P.G.      9   10     700   8    100   21    2800  11
SMITHERS     P.G.      9   10     600   1    100   22    2700   9
WELLS GRAY   P.G.      9   10    1000   1    100   20    4000  11
FT NLSN      F.N.      9   10     400   2     71   21    1250  10
FT STJOHN    F.N.      9   10     700   2     69   20    1450  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            N   11   NE  19
SMITHERS              NE  11   NE  19

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   17     100  14     98   20    1700  10
FRASER VLY   QUIL      9   17     100   5    100   21    1800  10
SRN VRISL    QUIL      9   17     100   5     97   21    1750   9
CNTRL VRISL  QUIL      9   17     100   5     95   20    1700   9
NRN VRISL    HRDY      9   15     100   2    100   20    1450  13
TERRACE      ANT       9   15     200   4    100   26    3200   8
STEWART      ANT       9   15     100   2     65   26    1500   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NE  28   E   43
PORT HARDY   N   17   NE  17   NE  20
SANDSPIT     N   39   NE  30   NE  28

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.


VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.

VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.

END/DSL
$$$$^^