FPCN39 CWLW 091330
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 THURSDAY 9 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      12   22     700   1     84   31    3200   4
KAMLOOPS     KEL      18   21     800   2     84   32    3350   4
OKANAGAN     KEL      21   22    1000   2     84   32    3350   4
CASTLEGAR    SPOK     17   23     750   3     68   31    2100   5
CRANBROOK    SPOK      9   20     950   5    100   30    3950  11
REVELSTOKE   KEL      10   19     650   1     44   26    1600   3

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S    9   S   19
CRANBROOK             VR   5   SW  19

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1800 m         23 C
SPOKANE         1000 m         24 C

TODAY'S VENTING: GOOD




VENTING FOR FRIDAY: GOOD




VENTING OUTLOOK SATURDAY THRU MONDAY: 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.     22   11     900  05     90   25    3200  08
PR. GEORGE   P.G.     15   10     800  05     96   23    3200  10
SMITHERS     P.G.     30   11     800  07     95   23    3000  09
WELLS GRAY   P.G.     18   09     700  08     90   21    2900  10
FT NLSN      F.N.     16   18     550   5     98   25    2700   7
FT STJOHN    F.N.      9   15     700   5    100   23    3700   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE   SW  5    W    7   W   8
SMITHERS              VR   5   S   8

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         20 C
FT. NELSON       700 m         22 C

TODAY'S VENTING: GOOD




VENTING FOR FRIDAY: GOOD




VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     24   17     400   5     37   22     700   5
FRASER VLY   QUIL     26   18     400   5     60   26    1450   5
SRN VRISL    QUIL      9   15     400   0      9   22     600   0
CNTRL VRISL  QUIL      9   17     400   0     36   24    1000   3
NRN VRISL    HRDY     28   13     550   4     38   17     700   5
TERRACE      HRDY     37   16     750   6     73   23    1600   7
STEWART      ANT       9   16     350   0      9   23    3000   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   S   19
PORT HARDY   VR   5   S   22   S   22
SANDSPIT     VR   5   S   24   S   35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       700 m         17 C
PORT HARDY      1000 m         19 C
ANNETTE          800 m         15 C

TODAY'S VENTING: FAIR




VENTING FOR FRIDAY: GOOD




VENTING OUTLOOK SATURDAY THRU MONDAY: FAIR TO GOOD




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


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