FPCN39 CWLW 091329
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 SATURDAY 9 MAY 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      15   15     500   2     43   19    1450   3

KAMLOOPS     KEL      36   17    1350   3     64   20    1900   5

OKANAGAN     KEL      19   15     750   3     76   22    2300   5

CASTLEGAR    SPOK     22   13    1750   3     74   23    2850   6

CRANBROOK    SPOK     24   13    2250   3     74   24    3950   7

REVELSTOKE   KEL      34   16    1350   3     65   20    2050   5


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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    N    9   N   13   NE  19
CRANBROOK             VR   5   E   19

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          300 m         14 C
SPOKANE          300 m         10 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.     22   10    1300   6    100   19    3950  11

PR. GEORGE   P.G.     25   12    1250   6    100   19    3700  12

SMITHERS     P.G.     16    9     500   1    100   18    3500  11

WELLS GRAY   P.G.     27   13    2000   6    100   20    4000  11

FT NLSN      F.N.     25    6     650   6    100   16    3400  17

FT STJOHN    F.N.     29   10    3700   8    100   15    3700  16



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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  13   E   13
SMITHERS              VR   5   N   13

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       450 m         12 C
FT. NELSON       650 m         12 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     38   13     800   5     54   16    1250   5

FRASER VLY   QUIL     40   14     850   5     58   17    1400   5

SRN VRISL    QUIL     37   13     750   4     57   17    1350   5

CNTRL VRISL  QUIL     37   13     750   4     73   19    1900   5

NRN VRISL    HRDY     26    9     400   5     74   15    1350  10

TERRACE      ANT      83   11    1400  10    100   18    2650   9

STEWART      ANT      83   13     300   2     50   18    2500   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    N   19   NE  19   E   15
PORT HARDY   N   19   NE  20   NE  31
SANDSPIT     VR   5   VR   5   SW  13

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       300 m         11 C
PORT HARDY       NIL m          9 C
ANNETTE          300 m          9 C

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR SUNDAY: GOOD


VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD




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


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