FPCN39 CWLW 031430
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Thursday 3 July 1997 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      20   20     600   3    100   27    3200   8
KAMLOOPS     KEL      46   21    1100   6    100   27    3350   8
OKANAGAN     KEL      18   19     700   3    100   26    3350   8
CASTLEGAR    KEL      10   14     700   1     80   26    3330   7
CRANBROOK    KEL      30   14    1200   5     95   23    3500  10
REVELSTOKE   KEL      10   16     500   1     93   21    1500   8

*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   SW   9   SW  19
CRANBROOK             W    9   W   24

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          800 m         20 C
SPOKANE         NOT AVAILABLE

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD

VENTING OUTLOOK SATURDAY THRU 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.     61   15    1600  10    100   22    3950  12
PR. GEORGE   P.G.     46   15    1050  13    100   21    3700  12
SMITHERS     P.G.     15   13     700   4    100   21    2750  10
WELLS GRAY   P.G.    100   16    2650  11    100   22    4000  12
FT NLSN      F.N.      9   18     400   3     91   26    3400   5
FT STJOHN    F.N.      9   15     700   3     93   21    3700   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   13   W   19
SMITHERS              VR   5   VR  19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         18 C
FT. NELSON       700 m         22 C

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD

VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     26   18     500   5     52   22    1050   5
FRASER VLY   QUIL     33   19     600   5     79   25    1850   6
SRN VRISL    QUIL     23   17     350   4     54   23    1150   5
CNTRL VRISL  QUIL     24   18     450   4     65   24    1500   5
NRN VRISL    HRDY     11   15     350   1     47   18     950   5
TERRACE      ANT      53   15     950   7    100   20    2500  11
STEWART      ANT      28   16     600   3     96   20    1950   8

*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   W   11
PORT HARDY   VR   5   S   22   S   28
SANDSPIT     S   35   S   30   S   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1000 m         22 C
PORT HARDY      1500 m         20 C
ANNETTE         NO INVERSION

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR FRIDAY: FAIR TO GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: FAIR TO GOOD.



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

END/JMS