FPCN39 CWLW 021334
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 2 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      13   18     550   1     53   28    1450   4

KAMLOOPS     KEL      19   18     700   3     50   27    1550   4

OKANAGAN     KEL      11   16     550   1     53   28    1850   5

CASTLEGAR    SPOK     14   16     750   2     49   26    1250   7

CRANBROOK    SPOK      9   16     950   2     59   24    1600  10

REVELSTOKE   KEL      14   16     600   3     59   27    1850   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    VR   5   VR   5   SW  11
CRANBROOK             VR   5   SW  11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1300 m         27 C
SPOKANE         1300 m         27 C

TODAY'S VENTING: Poor this morning and fair this afternoon. Briefly
good some areas late afternoon.

VENTING FOR SUNDAY: Good

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.     11   17    1050   2     46   26    3950   8

PR. GEORGE   P.G.     11   14     750   3     48   24    1800   8

SMITHERS     P.G.     12   12     700   2     36   21    1050   4

WELLS GRAY   P.G.      9   15    1000   5     55   25    4000   8

FT NLSN      F.N.     21   14     500   3     45   19     750  11

FT STJOHN    F.N.     10   16     700   5     62   23    3700  15


*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            W   24   W   37
SMITHERS              NW  20   NW  37

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1300 m         24 C
FT. NELSON       600 m         21 C

TODAY'S VENTING: Poor in the morning and fair this afternoon.
Locally good higher elevations late afternoon.


VENTING FOR SUNDAY: Good

VENTING OUTLOOK MONDAY THRU WEDNESDAY: Good

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     22   17    1000  10     48   21    1500  12

FRASER VLY   QUIL     16   18    1100   5     37   23    1800  10

SRN VRISL    QUIL     17   17     950   6     53   20    1250  12

CNTRL VRISL  QUIL     10   18    1050   4     48   23    1750  12

NRN VRISL    HRDY      9   13     200   0     47   18     750  10

TERRACE      ANT      12    9     300   5     56   22    2900  12

STEWART      ANT      12    9     900   3     50   22    2200   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    SW  11   VR   5   VR   5
PORT HARDY   NW  17   N   22   N   20
SANDSPIT     N   48   N   41   N   37

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1800 m         24 C
PORT HARDY      1100 m         24 C
ANNETTE          msg            msg

TODAY'S VENTING: Fair

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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