AOPA Pilot Magazine - April 2012 - 98

WXWATCH
Same day, same storm, same area. Here, the dual-pol’s differential phase capability further confirms the presence of hail in the circled area. A rating of 4.7 is a strong indicator of water-coated hail. Storm analysis imagery provided by Baron Services Inc.

To make these and other determinations, dual-pol Doppler provides several new products, among them: • Melting layer detection algorithm, or MLDA. Because dual-pol can distinguish between snowflakes, wet snow, and rain, it can pinpoint the altitudes at which frozen precipitation melts to rain. Now we have a better idea of where the freezing level resides, and where icing is most likely to occur. With conventional Doppler, this mishmash of precipitation sizes and dimensions causes high reflectivity levels that often show up as “bright-banding,” a highlighted area that says, yes, there’s heavy precipitation—but gives no information as to type, no matter the radar antenna’s tilt angle. • Correlation coefficient. This capability measures the similarities of the returns within a coverage pattern. So particles with uniform shapes (raindrops or snowflakes) show up in one signature; those with nonuniform shapes (hailstones or melting snow) are presented by another radar signature. Also, birds and insects can be better distinguished from precipitation. • Hydrometeor classification. Based on verified dual-pol signatures, echo types within shape categories can be classified. It can tell the difference between hail, graupel (snow pellets), large-droplet rain, heavy rain, light to moderate rain, wet snow, dry snow, ice crystals, ground clutter, and biological returns (birds, bats, and insects). • One-hour accumulation. This
AOPA PILOT •

capability shows more accurate estimates of the past hour’s precipitation amounts. • Storm total accumulation. This depicts storm total precipitation amounts over longer periods of time. It’s important to remember that while dual-pol promises a lot, it’s a bolt-on to the existing WSR-88D system. Some limitations of the original system will remain. For example, the radar beam loses strength the farther it travels from its antenna; intervening heavy precipitation can attenuate radar returns and therefore render distant, potentially dangerous returns invisible—and precipitation or other echoes below the radar beam are invisible to radar. Hold your horses I know what’s going through your mind: “Wow, so now I can see if there’s a hail shaft buried in all that rain, right on my airplane’s datalink weather display?” The answer, for now, is no, at least not directly. Bob Dreisewerd, chief development officer at Baron Ser vices Inc.— developer of the dual polarization technology for the NWS radar upgrade and the data service provider to XM WX Satellite Weather—says, “While there will be no noticeable differences in the current radar reflectivity information you are using today—preflight or in-flight—the dual-polarization information will provide the basis for even more accurate value-added in-flight weather products such as

98 • APRIL

2012


http://www.airsafetyinstitute.org/firc http://www.airsafetyinstitute.org/firc

AOPA Pilot Magazine - April 2012

Table of Contents for the Digital Edition of AOPA Pilot Magazine - April 2012

AOPA Turbine Pilot Magazine - April 2012
Contents
President’s Position
Hangar Talk
AOPA Media
AOPA Action
Letters
Waypoints
Proficient Pilot
Foundation Focus
License to Learn
Pilot Counsel
Fly Well
Pilot Briefing
L–39: Cool Flying. ’Nuff Said.
Flying a ‘Real’ Jet
For Pax Sake
Mentoring Matters: FARs for Jets
Trouble for Throttle Jockeys
Turbine Market Shows Mixed Signals
Glass Cockpits: Moving Targets
LSA: Big Foot Kitfox
Survival Mode
Aerial Amazement
Safety Pilot Landmark Accident: Calm in Chaos
Rebirth of the Pioneer RV
Revisiting a Tragedy
Bouncing Back
Technique: Mountain Majesties
Tougher Than a Tornado Sweepstakes: Setting the Hook
Products: A Range of Rescue Devices
Wx Watch: Radar Revolution
Dogfight: Time On Their Hands
Never Again
Fly-Outs
Fly by Wire
Pilots
AOPA Pilot Magazine - April 2012 - AOPA Turbine Pilot Magazine - April 2012
AOPA Pilot Magazine - April 2012 - Cover2
AOPA Pilot Magazine - April 2012 - 1
AOPA Pilot Magazine - April 2012 - Contents
AOPA Pilot Magazine - April 2012 - 3
AOPA Pilot Magazine - April 2012 - President’s Position
AOPA Pilot Magazine - April 2012 - 5
AOPA Pilot Magazine - April 2012 - Hangar Talk
AOPA Pilot Magazine - April 2012 - 7
AOPA Pilot Magazine - April 2012 - 8
AOPA Pilot Magazine - April 2012 - 9
AOPA Pilot Magazine - April 2012 - AOPA Media
AOPA Pilot Magazine - April 2012 - 11
AOPA Pilot Magazine - April 2012 - AOPA Action
AOPA Pilot Magazine - April 2012 - 13
AOPA Pilot Magazine - April 2012 - 14
AOPA Pilot Magazine - April 2012 - 15
AOPA Pilot Magazine - April 2012 - 16
AOPA Pilot Magazine - April 2012 - 17
AOPA Pilot Magazine - April 2012 - 18
AOPA Pilot Magazine - April 2012 - 19
AOPA Pilot Magazine - April 2012 - 20
AOPA Pilot Magazine - April 2012 - 21
AOPA Pilot Magazine - April 2012 - 22
AOPA Pilot Magazine - April 2012 - 23
AOPA Pilot Magazine - April 2012 - Letters
AOPA Pilot Magazine - April 2012 - 25
AOPA Pilot Magazine - April 2012 - 26
AOPA Pilot Magazine - April 2012 - 27
AOPA Pilot Magazine - April 2012 - Waypoints
AOPA Pilot Magazine - April 2012 - 29
AOPA Pilot Magazine - April 2012 - Proficient Pilot
AOPA Pilot Magazine - April 2012 - 31
AOPA Pilot Magazine - April 2012 - 32
AOPA Pilot Magazine - April 2012 - 33
AOPA Pilot Magazine - April 2012 - Foundation Focus
AOPA Pilot Magazine - April 2012 - 35
AOPA Pilot Magazine - April 2012 - License to Learn
AOPA Pilot Magazine - April 2012 - 37
AOPA Pilot Magazine - April 2012 - Pilot Counsel
AOPA Pilot Magazine - April 2012 - 39
AOPA Pilot Magazine - April 2012 - Fly Well
AOPA Pilot Magazine - April 2012 - 41
AOPA Pilot Magazine - April 2012 - Pilot Briefing
AOPA Pilot Magazine - April 2012 - 43
AOPA Pilot Magazine - April 2012 - 44
AOPA Pilot Magazine - April 2012 - 45
AOPA Pilot Magazine - April 2012 - 46
AOPA Pilot Magazine - April 2012 - 47
AOPA Pilot Magazine - April 2012 - 48
AOPA Pilot Magazine - April 2012 - I1
AOPA Pilot Magazine - April 2012 - I2
AOPA Pilot Magazine - April 2012 - 49
AOPA Pilot Magazine - April 2012 - LSA: Big Foot Kitfox
AOPA Pilot Magazine - April 2012 - 51
AOPA Pilot Magazine - April 2012 - 52
AOPA Pilot Magazine - April 2012 - 53
AOPA Pilot Magazine - April 2012 - 54
AOPA Pilot Magazine - April 2012 - 55
AOPA Pilot Magazine - April 2012 - 56
AOPA Pilot Magazine - April 2012 - 57
AOPA Pilot Magazine - April 2012 - Survival Mode
AOPA Pilot Magazine - April 2012 - 59
AOPA Pilot Magazine - April 2012 - 60
AOPA Pilot Magazine - April 2012 - 61
AOPA Pilot Magazine - April 2012 - 62
AOPA Pilot Magazine - April 2012 - 63
AOPA Pilot Magazine - April 2012 - 64
AOPA Pilot Magazine - April 2012 - 65
AOPA Pilot Magazine - April 2012 - Aerial Amazement
AOPA Pilot Magazine - April 2012 - 67
AOPA Pilot Magazine - April 2012 - 68
AOPA Pilot Magazine - April 2012 - 69
AOPA Pilot Magazine - April 2012 - 70
AOPA Pilot Magazine - April 2012 - 71
AOPA Pilot Magazine - April 2012 - 72
AOPA Pilot Magazine - April 2012 - 73
AOPA Pilot Magazine - April 2012 - Safety Pilot Landmark Accident: Calm in Chaos
AOPA Pilot Magazine - April 2012 - 75
AOPA Pilot Magazine - April 2012 - 76
AOPA Pilot Magazine - April 2012 - 77
AOPA Pilot Magazine - April 2012 - 78
AOPA Pilot Magazine - April 2012 - Rebirth of the Pioneer RV
AOPA Pilot Magazine - April 2012 - 80
AOPA Pilot Magazine - April 2012 - 81
AOPA Pilot Magazine - April 2012 - 82
AOPA Pilot Magazine - April 2012 - Revisiting a Tragedy
AOPA Pilot Magazine - April 2012 - 84
AOPA Pilot Magazine - April 2012 - 85
AOPA Pilot Magazine - April 2012 - 86
AOPA Pilot Magazine - April 2012 - Bouncing Back
AOPA Pilot Magazine - April 2012 - 88
AOPA Pilot Magazine - April 2012 - 88a
AOPA Pilot Magazine - April 2012 - 88b
AOPA Pilot Magazine - April 2012 - 89
AOPA Pilot Magazine - April 2012 - 90
AOPA Pilot Magazine - April 2012 - Technique: Mountain Majesties
AOPA Pilot Magazine - April 2012 - 92
AOPA Pilot Magazine - April 2012 - Tougher Than a Tornado Sweepstakes: Setting the Hook
AOPA Pilot Magazine - April 2012 - 94
AOPA Pilot Magazine - April 2012 - Products: A Range of Rescue Devices
AOPA Pilot Magazine - April 2012 - 96
AOPA Pilot Magazine - April 2012 - Wx Watch: Radar Revolution
AOPA Pilot Magazine - April 2012 - 98
AOPA Pilot Magazine - April 2012 - 99
AOPA Pilot Magazine - April 2012 - Dogfight: Time On Their Hands
AOPA Pilot Magazine - April 2012 - 101
AOPA Pilot Magazine - April 2012 - Never Again
AOPA Pilot Magazine - April 2012 - 103
AOPA Pilot Magazine - April 2012 - 104
AOPA Pilot Magazine - April 2012 - 105
AOPA Pilot Magazine - April 2012 - Fly-Outs
AOPA Pilot Magazine - April 2012 - Fly by Wire
AOPA Pilot Magazine - April 2012 - 108
AOPA Pilot Magazine - April 2012 - 109
AOPA Pilot Magazine - April 2012 - 110
AOPA Pilot Magazine - April 2012 - 111
AOPA Pilot Magazine - April 2012 - Pilots
AOPA Pilot Magazine - April 2012 - Cover3
AOPA Pilot Magazine - April 2012 - Cover4
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