FPCN39 CWLW 101434
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 10 June 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   20     600   1    100   30    2800   9
KAMLOOPS     KEL      13   19     700   1    100   28    2600   8
OKANAGAN     KEL       9   18     600   0    100   28    2600   8
CASTLEGAR    SPOK     28   18     850   6     95   29    2800   7
CRANBROOK    SPOK      9   18     950   4    100   26    3950   7
REVELSTOKE   KEL       9   17     600   0     86   26    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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   S    9
CRANBROOK             VR   5   E   11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 m         22 C
SPOKANE         1060 m         23 C

TODAY'S VENTING: STRONG DAYTIME HEATING WILL ERODE INVERSION BY
MIDDAY. GOOD VENTING WILL PREVAIL OVER VIRTUALLY ALL AREAS TODAY.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO 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.     76   16    1950  10    100   23    3950   8
PR. GEORGE   P.G.     29   14     950   9    100   21    3700   8
SMITHERS     P.G.     12   10     650   3     53   18    1300   7
WELLS GRAY   P.G.     76   16    2200   8    100   24    4000   8
FT NLSN      F.N.     58   15     550  34    100   23    3400   9
FT STJOHN    F.N.    100   15    1600  32    100   23    3700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  17   S   26
SMITHERS              SE  26   SE  26

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       975 m         17 C
FT. NELSON       600 m         16 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD BECOMING FAIR FRIDAY.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     29   17     450   6     49   23    1450   4
FRASER VLY   QUIL     33   18     550   6     74   27    2150   5
SRN VRISL    QUIL     26   16     400   5     46   23    1250   3
CNTRL VRISL  QUIL     27   17     450   5     46   23    1300   3
NRN VRISL    HRDY     13   12     150   3     18   15     300   3
TERRACE      ANT       9   15     200   8    100   22    3200   6
STEWART      ANT      30   15     300   7    100   22    3000   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   15   S   26   S   37
PORT HARDY   S   44   S   56   S   57
SANDSPIT     SE  46   SE  57   SE  61

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       790 m         20 C
PORT HARDY       550 m         17 C
ANNETTE          300 m         14 C

TODAY'S VENTING: WEAK WINDS AND A STABLE AIRMASS WILL MEAN FAIR
VENTING IN THE SOUTH. IMPROVING CONDITIONS ON THE NORTH COAST
WITH STRONGER WINDS AND LESS STABILITY.

VENTING FOR WEDNESDAY: FAIR.

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO GOOD BECOMING LOCALLY
POOR ON SATURDAY.

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

END/BJS