FPCN39 CWLW 151400
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 THURSDAY 15 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   13     400   5    100   21    2100   9
KAMLOOPS     KEL       9   15     500   5    100   21    2500  10
OKANAGAN     KEL       9   14     600   5    100   20    2250  11
CASTLEGAR    SPOK     16   12     600   8    100   21    3500   9
CRANBROOK    SPOK     20   12    1200  10    100   20    3950  10
REVELSTOKE   KEL      12   13     600   8     91   17    1950   9

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   E   11   S   17
CRANBROOK             E    9   NE  19

TODAY'S VENTING: POOR THIS MORNING RISING TO GOOD THIS AFTERNOON.

VENTING FOR FRIDAY: 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.     20   10    1200  10    100   16    3950  15
PR. GEORGE   P.G.     29    8    1000  10    100   14    2450  28
SMITHERS     P.G.      9   11     600   5    100   14    2150  23
WELLS GRAY   P.G.     33    7    1300  12    100   16    4000  25
FT NLSN      F.N.     10   12     600   5    100   15    2250  10
FT STJOHN    F.N.     16   10     800   8    100   17    3700  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  26   E   24
SMITHERS              NE  24   E   24

TODAY'S VENTING: POOR THIS MORNING EXCEPT FAIR AT WELLS GRAY RISING
TO GOOD OVER ALL AREAS THIS AFTERNOON.

VENTING FOR FRIDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     32   15     400   8     51   18    1050   5
FRASER VLY   QUIL     10   15     200   5     52   18    1050   5
SRN VRISL    QUIL     15   12     300   5     47   18    1050   5
CNTRL VRISL  QUIL     32   15     400   8     48   20    1050   5
NRN VRISL    HRDY     27   15    1000   3     39   17     850   4
TERRACE      ANT      20   14     500  10    100   23    1250  15
STEWART      ANT       9   14     200   5     49   23     450  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   SE  13
PORT HARDY   N   22   NE  24   NE  30
SANDSPIT     N   30   NE  33   NE  41

TODAY'S VENTING: POOR THIS MORNING RISING TO FAIR EXCEPT GOOD AT
TERRACE THIS AFTERNOON.

VENTING FOR FRIDAY: GOOD

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