FPCN39 CWLW 011331
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 WEDNESDAY 1 JULY 1998 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   22     550   0     94   33    3200   5
KAMLOOPS     KEL       9   21     550   0     94   32    3350   5
OKANAGAN     KEL       9   20     550   0     94   31    3350   5
CASTLEGAR    SPOK     17   20     750   3     88   31    3500   4
CRANBROOK    SPOK      9   18     950   7     89   29    3950   5
REVELSTOKE   KEL       9   19     550   0     67   28    2350   4

*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   VR   5
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1800 m         20 C
SPOKANE         3000 m         24 C

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: 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.     31   16    1400   5     99   20    3950   6
PR. GEORGE   P.G.     16   16     950   3     55   20    1950   5
SMITHERS     P.G.     16   16     800   3     24   19    1150   3
WELLS GRAY   P.G.     53   17    1950   6     99   21    4000   6
FT NLSN      F.N.     71   19    1000  15    100   28    3400  11
FT STJOHN    F.N.     17   15    1000  12     81   21    1500  14

*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   VR   5
SMITHERS              E   11   E    5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      3000 m         16 C
FT. NELSON      4400 m         21 C

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    KEL       9   17     100   0      9   23     550   0
FRASER VLY   KEL       9   18      50   0     12   25     700   1
SRN VRISL    KEL       9   15       0   0      9   21     500   0
CNTRL VRISL  HRDY     63   19     750  10     99   27    1650  11
NRN VRISL    HRDY     42   14     400  10     57   17     600  10
TERRACE      ANT      10   17     200  14     63   21     750  14
STEWART      ANT      21   16     200   7     48   21     550   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   13   NW  11   W    9
PORT HARDY   NW  31   NW  26   NW  20
SANDSPIT     NW  46   NW  31   NW  26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      4700 m         27 C
PORT HARDY      3200 m         21 C
ANNETTE         3300 m         22 C

TODAY'S VENTING: FAIR




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD




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


END/RAM