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Jennifer DeHart and Robert Houze

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Presentation on theme: "Jennifer DeHart and Robert Houze"— Presentation transcript:

1 Airborne Doppler radar observations of mid-latitude storms during OLYMPEX
Jennifer DeHart and Robert Houze 17th Conference on Mountain Meteorology NASA grants: NNX15AN52H, NNX13AG71G, NNX15AL38G, NNX16AD75G NSF grant: AGS

2 December 8th Strong precipitation enhancement on windward slopes to the SW Goal: examine how precipitation structure varies around the Olympics

3 UW WRF – 36 km Surface + TPW – 12/8

4 UW WRF – 4 km 3 hr precip + melting level hgt – 18 UTC 12/8

5

6 Prairie Creek 24 hour total: ~165 mm / 6.5 in
UW OLYMPEX gauges (Hurricane Ridge from NW Avalanche Center)

7 Hourly rainfall at windward locations (Prairie Creek / Bishop Field) double low elevation site (Seed Orchard) and lee site (Hurricane Ridge) through 2200 UTC 8 Dec

8 Weak precipitation (1430-1600 UTC)
Flight legs Weak precipitation ( UTC) Strong precipitation (1600 – 1830 UTC)

9 APR-3 NASA DC-8 equipped with the Advanced Precipitation Radar 3
Ku / Ka / W band Cross-track scanning strategy High vertical resolution Documents structure around the Olympics (windward, lee, ocean and high terrain)

10

11 Radar echo limited to immediate vicinity of terrain
Windward Radar echo limited to immediate vicinity of terrain Max enhancement found near initial windward slopes Highest terrain does not see maximum enhancement Echo top height decreases in lee Precipitation removed from most intense cloud band

12 Some similarities with earlier leg
Northern leg Southern leg Windward Windward Some similarities with earlier leg Except radar echo now exists upstream APR-3 also documents changing melting level height

13 Less than an hour later, leeside reflectivity filled in
Northern leg Southern leg Windward Windward Less than an hour later, leeside reflectivity filled in Reflectivity profiles in lee vary over short distances Reduction in reflectivity towards surface in southern leg, perhaps indicating evaporation of hydrometeors

14 Summary APR-3 complements stationary ground radars by providing data around the Olympic peninsula, especially over high terrain Maximum reflectivity present over first ridge Reflectivity intensity over the highest terrain no greater than in the initial ascent Synoptic pattern exerts a strong influence on the precipitation structure around terrain

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