Transition of radar refractivity to operational radars
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Transition of Radar Refractivity to Operational Radars. Interested parties: NCAR, McGill University, NEXRAD Office of Science and Technology, Federal Aviation Administration, and University participants??. OS&T Briefing, 6 April 2004. REFRACT T.

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Transition of Radar Refractivity to Operational Radars

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Transition of radar refractivity to operational radars

Transition of Radar Refractivity to Operational Radars

Interested parties: NCAR, McGill University, NEXRAD Office of Science and Technology, Federal Aviation Administration, and University participants??

OS&T Briefing, 6 April 2004


Refract t

REFRACTT

Refractivity Experiment For H2O Research And Collaborative operational Technology Transfer


Transition of radar refractivity to operational radars

Forecasting Challenge:Tracking the “pockets” of boundary layer moisture so critical for convection initiation and growth.

Moisture gradient

Moisture gradient

Convergence boundaries

Convergence boundaries

00:40 UTC

00:40 UTC

22:57 UTC

00:31 UTC

00:01 UTC

00:31 UTC

22:57 UTC

00:01 UTC

23:27 UTC

23:27 UTC

Moisture gradients and convergence boundaries associated with thunderstorm development, June 12, 2002


Transition of radar refractivity to operational radars

Why REFRACTT

  • Demonstrate feasibility on operational radars and motivate

  • NWS and FAA to install refractivity on WSR-88D and TDWR

  • Demonstrate forecast improvement in models and very

  • short period forecasting techniques over a larger domain

  • Improve basic understanding of the role of water vapor

  • in convective storm initiation and storm evolution

  • This is technology transfer of IHOP results to the operational community


Transition of radar refractivity to operational radars

100 km

Boundary

Install refractivity on the national network of radars

S-Pol Radar

0 km

WSR-88D’s

TDWR Radars

TV Radar (Local Station)

Surface Mesonets

NWS/ResearchSoundings

AERI: ARM/CART

-100 km

-100 km

0 km

100 km

Satellite FOV

Satellite Derived

Products: CAPE, CIN

LI, Precipitable Water,

Soundings

Spring 2006

Oklahoma

REFRACTT

Refractivity Experiment For H20 Research And

Collaborative operational Technology Transfer


Future install refractivity on all available operational radars

FAA Radar Networks

λ = 5 cm

PT = 250 kw

0.5° pencil beam

λ = 10 cm

PT = 1000 kw

1.4° x 5° fan beam

Future: Install refractivity on all available operational radars


Assimilation of refractivity into vdras

Cost Function

VDRAS Boundary Layer Winds

Old

New equation

Assimilation of Refractivity into VDRAS

Juanzhen Sun

  • Test technique using IHOP data to produce stability fields (CAPE, CIN, and moisture)

  • Test use of VDRAS stability fields in the Auto-Nowcaster


Transition of radar refractivity to operational radars

Comparison of Refractivity Observations with

High Resolution Land Data Assimilation System (HRLDAS)

16:00

16:00

Refractivity

Soil Moisture

18:00

18:00

Refractivity

Soil Moisture

Refractivity Hourly HRLDAS Evaporation (mm)

Collaborative studies with Fei Chen

IHOP

25 May 2002


Data processing ihop climatology

Data Processing: IHOP “Climatology”

Broad WNW-ESE refractivity and daily N gradient observed.

Mimics (reflects?) climatological moisture gradient in the area.


Transition of radar refractivity to operational radars

Small-Scale Structure of N

Lesser variability in along-wind direction than across:

  • More mixing in along-wind direction via surface friction?

  • More advection-driven E-W gradients (across wind).


Transition of radar refractivity to operational radars

Timeline

2003

2004

2005

2006

2007

Prototype Development

Refractivity on S-Pol’s RVP8

Prototype development on TDWR and ASR-9

ORDA (RVP8) installation

Prototype installation and testing on NSSL’s KOUN

Prototype installation and testing on ROC’s KCRI

Operational Radar Refractivity Test


Transition of radar refractivity to operational radars

End


Transition of radar refractivity to operational radars

S-Pol refractivity

VDRAS convergence field at z=0.187 km

Results from IHOP June 12 case study


Retrieved water vapor fields for the first three model levels

Z=0.187 km

Retrieved water vapor fields for the first three model levels

Z=0.937 km

Z= 0.562 km


Where are we currently

Where are we currently ?

  • Received the support of the NEXRAD TAC at the 28 October 2003 meeting.

  • Coordinating with Bob Saffle on writing documentation for NWS Stage 1 and Stage 2 documents

  • Weber and Parker (MIT/LL) have received high level (verbal not monetary) support for testing the refractivity technique on the TDWR testbed radar in OKC.

  • Submitted a preliminary letter of intent to NCAR/ATD to request the SPol radar for REFRACT 2006


Transition of radar refractivity to operational radars

  • Piggy-back on the HEAT 2005 Experiment?

  • Install refractivity on CHILL and the ?? Radar


Transition of radar refractivity to operational radars

NCAR SPol Ground Clutter Map

Oklahoma Panhandle – IHOP2002

Would like to see similar by-pass filter maps for selected NEXRAD radar sites.

Cheryl Stephenson and Dave Zittel at ROC have been contacted.


Transition of radar refractivity to operational radars

GROUND CLUTTER PATTERNS

OKC TDWR TESTBED SITE

50 km range ring


Transition of radar refractivity to operational radars

Observations of a Gust Front

Refractivity

Reflectivity


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