FPCN39 CWLW 051329
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 SUNDAY 5 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      20   18     450   4     53   24    1550   4
KAMLOOPS     KEL      14   17     500   4     58   24    1950   4
OKANAGAN     KEL      25   19     750   4     84   27    3350   4
CASTLEGAR    SPOK     37   20     850   9    100   28    3500  11
CRANBROOK    SPOK      9   16     950  12    100   26    3950  13
REVELSTOKE   KEL      11   17     500   4     50   22    1700   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   13   W   17
CRANBROOK             VR   5   W   15

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          490 m         18 C
SPOKANE          915 m         20 C

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     52   19    1450  10    100   24    3950   9
PR. GEORGE   P.G.     41   19    1050  11    100   25    2650   9
SMITHERS     P.G.     22   19     850   4     88   25    2150   8
WELLS GRAY   P.G.     53   19    1600   9    100   24    4000   9
FT NLSN      F.N.      9   18     400   0      9   22     600   0
FT STJOHN    F.N.      9   19     700   0     19   24    1300   2

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   20   W   24
SMITHERS              SW  20   SW  24

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       990 m         19 C
FT. NELSON       900 m         26 C

TODAY'S VENTING: GOOD EXCEPT POOR IN NORTHEASTERN BC

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     71   15     650  15     89   18    1000  15
FRASER VLY   QUIL     70   15     650  15     89   18     950  15
SRN VRISL    QUIL     16   16     750   1     20   21    1150   1
CNTRL VRISL  QUIL     17   17     850   1     20   20    1100   1
NRN VRISL    QUIL     13   14     400   1     17   17     850   1
TERRACE      ANT      80   17     800  18    100   24    1800  19
STEWART      QUIL     17   17     850   1     84   24    1550   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   15   W   19   NW  20
PORT HARDY   SW  20   SW  24   SW  28
SANDSPIT     SW  19   SW  20   SW  26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1300 m         22 C
PORT HARDY      MISG
ANNETTE          860 m         18 C

TODAY'S VENTING: GOOD EXCEPT POOR NORTHERN VANCOUVER ISLAND

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD


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


END/MWSO