Okanagan Mountain Fire of August 2003: Radar Case Study

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Presentation transcript:

Okanagan Mountain Fire of August 2003: Radar Case Study Robert’s Radar Reminder Okanagan Mountain Fire of August 2003: Radar Case Study Taken from http://castanet.firewatch.net photo gallery (Rick Cohen).

Overview Discovered 4:21 AM August 16, 2003. Grew from 2000 to 11,000 hectares August 19. Nearly 250 homes burned August 21 and 22. 12 Kettle Valley trestles lost early September. Reported 100% contained September 29 after burning 25,912 hectares. Overview of some radar imagery showing various features.

Aug. 16: Lightning strike From CLDN: strike recorded at 09:02:35 UTC, likely the one that sparked the blaze.

Aug. 17: First glimpse of fire First glimpses of fire on radar.

Aug. 20: Directional shear Directional wind shear: different elevation angles show plumes in different directions.

Aug. 21: Shifting winds Shifting winds.

500-mb chart at 00Z Aug. 22: heights of about 576 dam with SW flow. Aug. 22: 500 mb chart 500-mb chart at 00Z Aug. 22: heights of about 576 dam with SW flow.

Aug. 22: Surface chart Surface chart at 00Z Aug. 22nd. Apparent light pressure gradients at surface.

YLW SA 0000 -X E80 BKN 11/2FU 063/24.8/9.8/1804/FU8AC1 6028 UNOFF Aug. 22: YLW SAs YLW SA 0000 -X E80 BKN 11/2FU 063/24.8/9.8/1804/FU8AC1 6028 UNOFF YLW SP 0042 -X 11/4FU ///1602/FU9 UNOFF YLW SA 0100 -X 1FU 058/24.6/9.4/0000/FU9 UNOFF YLW SA 0200 -X E110 BKN 1FU 057/23.0/9.5/0000/FU8AC1 UNOFF YLW SA 0300 -X E90 BKN 1FU 060/20.1/9.6/0000/FU8AC1 5005 UNOFF YLW SP 0324 -X E90 BKN 2FU ///0000/FU8AC1 UNOFF YLW SA 0400 -X 21/2FU 068/19.0/9.0/0000/FU9 UNOFF YLW SA 0500 -X 3FU 075/17.7/9.0/0000/FU9 RMK VIS N 5 UNOFF Note light winds for Kelowna Airport.

Aug. 22: YLW tephi Kelowna tephigram for 00Z Aug. 22nd: lower levels unstable and very dry. Winds aloft mixed down.

Echo tops exceed 6 km over fire, then decrease downwind rapidly. Aug. 22: Echo tops Echo tops exceed 6 km over fire, then decrease downwind rapidly.

Aug. 22: Fire inflow Fire inflow detected.

Tops for Friday evening slightly lower. Aug. 23: Echo tops Tops for Friday evening slightly lower.

Some indication of fire inflow for Friday evening. Aug. 23: Fire inflow Some indication of fire inflow for Friday evening.

Incoming CBs change plume pattern. Aug. 23: Incoming CBs Incoming CBs change plume pattern.

Maximum rain accumulations before cell moves over fire. Aug. 23: Accumulations Maximum rain accumulations before cell moves over fire.

Sep. 2: Plume further east Note plume source now about 10 km further to the east.

Kettle Valley fire: note wavering of smoke plume. Sep. 3: Wavering plume Kettle Valley fire: note wavering of smoke plume.

Sep. 4: Flare-up Flare-up (due to gustfront from approaching cell??); complex wind pattern in plume.

Slow veering of winds; zero-isodop highlights turbulent winds. Sep. 5: Veering winds Slow veering of winds; zero-isodop highlights turbulent winds.

Sep. 6: Narrow plume Strong winds yield narrow plume; some indication of low level jet ahead of approaching cold front.

What we all were waiting for: RAIN! Sep. 8: Rain! What we all were waiting for: RAIN!

Summary Strong diurnal cycle to plume echoes No echoes – fire still burns → XSS part time fire watch tower Low elevation angles detect more of fire Higher elevation angles good for intensities Rich detail in Vr fields, including inflows Much data available when sufficient smoke, usually during P.M.