map and improve ii experimental areas share workshop, boulder, 5 may 2005
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MAP and IMPROVE II Experimental Areas
SHARE Workshop, Boulder, 5 May 2005
2D Idealized WRF simulation of cross-barrier flow
120 90 60 30 0Distance (km) from S-Pol radar
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MAP IOP2b – 20 September 1999
3h MEAN S-Pol RADAR DATAREFLECTIVITY
RADIAL VELOCITY
FREQUENCY OCCURRENCE
54443424144-6-16-26
dBZ
363024181260-6-12
m/s
1614121086420
%
STABILITY FROM MILAN SOUNDING
VERTICAL POINTING RADAR
0700 0720 0740 Time (UTC) 20 Sep
REFLECTIVITY
RADIAL VELOCITY
0
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t (k
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Dry snow (50 %)Wet snow (30 %)Graupel - Shaded
120 90 60 30 0Distance (km) from S-Pol radar
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MAP IOP2b – 20 September 1999
3h MEAN S-Pol RADAR DATAREFLECTIVITY
RADIAL VELOCITY
FREQUENCY OCCURRENCE
54443424144-6-16-26
dBZ
363024181260-6-12
m/s
1614121086420
%
STABILITY FROM MILAN SOUNDING
VERTICAL POINTING RADAR
0700 0720 0740 Time (UTC) 20 Sep
REFLECTIVITY
RADIAL VELOCITY
0
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5 6
Hei
gh
t (k
m)
0
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3 4
5 6
Dry snow (50 %)Wet snow (30 %)Graupel - Shaded
120 90 60 30 0Distance (km) from S-Pol radar
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MAP IOP8 – 21 October 1999
3h MEAN S-Pol RADAR DATAREFLECTIVITY
RADIAL VELOCITY
FREQUENCY OCCURRENCE
54443424144-6-16-26
dBZ
363024181260-6-12
m/s
1614121086420
%
STABILITY FROM MILAN SOUNDING
Dry snow (50 %)Wet snow (30 %)Graupel - ShadedGraupel and/or
dry aggregates –Shaded
VERTICAL POINTING RADARREFLECTIVITY
RADIAL VELOCITY
0600 0800 1000 1200 Time (UTC) 21 Oct
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REFLECTIVITY
RADIAL VELOCITY
P3 RADIAL VELOCITY
2D Idealized WRF simulation of cross-barrier flow CASE 11
0 25 50 75 100Distance (km) from S-Pol radar
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IMPROVE II CASE 11 – 13-14 December 2001
3h MEAN S-Pol RADAR DATAREFLECTIVITY
RADIAL VELOCITY
FREQUENCY OCCURRENCE
54443424144-6-16-26
dBZ
484032241680-8-16
m/s
4035302520151050
%
STABILITY FROM UW SOUNDING
Dry snow (50 %)Wet snow (30 %)Graupel - ShadedGraupel and/or dry aggregates –Shaded
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VERTICAL POINTING RADAR
2300 0000 0100 0200
Time (UTC) 13-14 Dec
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RADIAL VELOCITY (m/s)
REFLECTIVITY (dBZ)
IMPROVE II CASE 11 – 13-14 December 2001
Ice particle images obtained by NOAA P3
IMPROVE II CASE 11 – 13-14 December 2001Idealization
JAMES AND HOUZE ‘05 Synoptic Situations
JAMES AND HOUZE ‘05 Radar Climatology
What to investigate in SHARE?
Processes affecting precipitation enhancement over windward slope
• More stable cases– Enhancement of low-level shear over windward slope in stable case– Turbulence in shear layer over the windward slope
• Buoyancy, shear, terrain
– How turbulent overturning layer affects microphysical processes• Aggregation, riming, coalescence
– Temperature feedback
• Less stable cases– Enhanced lifting over small-scale individual peaks vs barrier scale
• Stable lifting at high Fr, or release of potential instability
– Microphysical processes over individual peaks• Riming, aggregation, coalescence
End
IMPROVE II CASE 11 – 13-14 December 2001
NOAA P3 aircraft tail radar data
IMPROVE II CASE 11 – 13-14 December 2001
Upstream sounding used in simulation
Upstream-upslope rain gauge comparison
SalemLittle Meadows
TOTALSSalem: 10.24”
Little Meadows: 30.50”