FPCN39 CWLW 181400
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 SUNDAY 18 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   5     100   26    1950  10
KAMLOOPS     KEL      9   17     400   5     100   26    2350  10
OKANAGAN     KEL      9   19     400   8     100   26    2350  10
CASTLEGAR    SPOK     9   17     500   8     100   22    3500   6
CRANBROOK    SPOK     9   15    1000   5      98   18    3950   6
REVELSTOKE   KEL      9   15     500   4      88   21    1450  13

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   11   NW  17
CRANBROOK             W   11   W   22

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: 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   21    3950  14
PR. GEORGE   P.G.     9   10     700   2      59   22    1300  10
SMITHERS     P.G.     9   10     600   1     100   25    3500  10
WELLS GRAY   P.G.     9   10    1000   1     100   21    4000  14
FT NLSN      F.N.     9   10     400   4      15   25     700   2
FT STJOHN    F.N.     9   10     700   5       9   21     700  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   NW  17
SMITHERS              W   24   NW  17

TODAY'S VENTING: GENERALLY GOOD.

VENTING FOR MONDAY: 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   5      50   21    1050   5
FRASER VLY   QUIL     9   17     100   5      69   24    1400   6
SRN VRISL    QUIL     9   17     100   3      60   23    1250   5
CNTRL VRISL  QUIL     9   17     100   5      66   25    1450   5
NRN VRISL    HRDY     9   15     100   4      30   16     700   3
TERRACE      ANT      9   15     200   4     100   28    2350  13
STEWART      ANT      9   15     100   2     100   28    1650  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W    9   NW  11   N   15
PORT HARDY   NW  17   NW  20   NW  20
SANDSPIT     NW  31   NW  33   NW  37

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR MONDAY: GOOD.

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

END/
$$$$^^