FPCN39 CWLW 191432
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 Tuesday 19 August 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      13   24    1050   1     65   32    3200   6
KAMLOOPS     KEL      12   22    1000   1     65   30    3350   6
OKANAGAN     KEL      10   20     650   1     65   30    3350   6
CASTLEGAR    SPOK     33   20     850   7    100   28    3500   7
CRANBROOK    SPOK      9   17     950   8    100   25    3950   7
REVELSTOKE   KEL      10   18     550   1     60   25    1750   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   SW   9
CRANBROOK             VR   5   SW  11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1900 m         25 C
SPOKANE         1000 m         24 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU 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.     41   18    1350   9    100   26    3950   6
PR. GEORGE   P.G.     17   16     850   5    100   25    3700   6
SMITHERS     P.G.     14   17     800   2     87   24    2750   6
WELLS GRAY   P.G.     32   17    1300   9    100   26    4000   6
FT NLSN      F.N.     84   16    1150  16    100   22    3400  11
FT STJOHN    F.N.    100   16    2400  17    100   22    3700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   SW  13
SMITHERS              S    9   SW  13

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         23 C
FT. NELSON      1200 m         15 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     45   19     850   6     45   23     950   7
FRASER VLY   QUIL     46   19     850   6     40   27    1700   5
SRN VRISL    QUIL     43   18     800   5     45   25    1000   6
CNTRL VRISL  QUIL     45   20     850   5     50   27    1600   7
NRN VRISL    HRDY     27   15     450   5     46   19     750   6
TERRACE      ANT      64   19    1250   7     80   23    2250  10
STEWART      ANT      16   17     350   2     74   23    1550   6

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SE   9   S   13
PORT HARDY   VR   5   SE  20   S   22
SANDSPIT     S   26   S   31   S   39

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1000 m         25 C
PORT HARDY      2300 m         29 C
ANNETTE         1700 m         22 C

TODAY'S VENTING: FAIR SOUTH. GOOD NORTH.

VENTING FOR WEDNESDAY: FAIR.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD.


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

END/JMS