FPCN39 CWLW 021432
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 Wednesday 2 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      69   19    1150   9    100   24    2300  15
KAMLOOPS     KEL      82   19    1800   8    100   25    3350   7
OKANAGAN     KEL      73   18    1400   9    100   24    2850   7
CASTLEGAR    KEL      65   16    1200  11    100   21    3300   8
CRANBROOK    KEL      65   16    2250   6    100   22    3950   6
REVELSTOKE   KEL      15   16     600   2    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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   W    9
CRANBROOK             VR   5   NW  13

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          550 m         16 C
SPOKANE         MISSING        ## C

TODAY'S VENTING: BECOMING GOOD BY AFTERNOON DUE TO AN UNSTABLE
AIRMASS.

VENTING FOR THURSDAY: FAIR TO GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD FRIDAY AND
SATURDAY. GOOD ON SUNDAY.




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.     90   15    2050  12    100   22    3950  10
PR. GEORGE   P.G.     86   16    1700  13    100   22    3700  10
SMITHERS     P.G.     25   14     800   6    100   21    3500   9
WELLS GRAY   P.G.     99   16    2750  10    100   22    4000  10
FT NLSN      F.N.      9   16     400   3     82   22    2600   5
FT STJOHN    F.N.     19   15     950   4    100   21    3700   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   W   11
SMITHERS              VR   5   VR  11

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       800 m         14 C
FT. NELSON       650 m         18 C

TODAY'S VENTING: BECOMING GOOD BY AFTERNOON DUE TO AN UNSTABLE
AIRMASS.

VENTING FOR THURSDAY: GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD FRIDAY. GOOD ON
THE WEEKEND.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     46   17    1050   5     50   21    1350   4
FRASER VLY   QUIL     45   17     950   5     54   23    1450   4
SRN VRISL    QUIL     29   15     550   4     50   21    1350   4
CNTRL VRISL  QUIL     42   17     900   4     50   21    1350   4
NRN VRISL    HRDY     29   14     250   9     61   17    1100   6
TERRACE      ANT     100   15    1350  16    100   19    2200  16
STEWART      ANT      76   15     900  11    100   19    1900  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W    9   SW   9   SW  15
PORT HARDY   SW   9   S   22   S   26
SANDSPIT     S   24   SE  26   SE  26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1800 m         25 C
PORT HARDY       200 m         14 C
ANNETTE         NONE           ## C

TODAY'S VENTING: FAIR ON THE SOUTH COAST DUE TO A RIDGE OF HIGH
PRESSURE. GOOD FURTHER NORTH MAINLY DUE TO WINDS ASOCIATED WITH
A WEAK FRONTAL SYSTEM.

VENTING FOR THURSDAY: FAIR.

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR FRIDAY. BECOMING GOOD
ON THE WEEKEND.




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

END/JDG