FPCN39 CWLW 081336
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 8 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   QUIL     63   22     850  11    100   32    3200  16
KAMLOOPS     KEL      11   22     700   1     90   32    3350   5
OKANAGAN     KEL       9   21     550   0     90   32    3350   5
CASTLEGAR    SPOK     20   24     750   4    100   33    3500   6
CRANBROOK    SPOK      9   19     950   4    100   28    3950   7
REVELSTOKE   KEL      10   21     700   1     57   28    2150   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   S   11
CRANBROOK             VR   5   SW  15

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1300 m         21 C
SPOKANE         1100 m         25 C

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: 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.     12   12     800  18     65   24    2800  22
PR. GEORGE   P.G.     14   12     900  17     70   23    3000  20
SMITHERS     P.G.     07   10     300  08     60   21    1500  08
WELLS GRAY   P.G.     10   09     800  14     73   19    2300  18
FT NLSN      F.N.      9   16     400  21    100   25    3400  19
FT STJOHN    F.N.      9   14     700  21    100   23    3700  19

*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   NW   5
SMITHERS              VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         12 C
FT. NELSON       800 m         17 C

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     53   17     600  11     66   22     800  11
FRASER VLY   QUIL     57   18     600  11     93   26    1400  11
SRN VRISL    QUIL      9   16     500   0     70   21     700   0
CNTRL VRISL  QUIL      9   18     600   0    100   28    2000  13
NRN VRISL    QUIL      9   13     300   0     45   17     550   0
TERRACE      ANT      25   13     700   4     66   21    2050   4
STEWART      QUIL      9   15     450   0     42   21     700   0

*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   11   VR   5   SW  19
PORT HARDY   NW  13   W   15   W   13
SANDSPIT     S   22   S   24   S   22

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       900 m         16 C
PORT HARDY      1000 m         15 C
ANNETTE         1800 m         04 C

TODAY'S VENTING: FAIR TO GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD




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


END/RAM