High Resolution Radar Imagery In AWIPS David L. Andra, Jr. WFO Norman, Oklahoma.

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Presentation transcript:

High Resolution Radar Imagery In AWIPS David L. Andra, Jr. WFO Norman, Oklahoma

Background ORPG and AWIPS Known as “8-bit” Products 8 bit  2 8 = 256 data levels Like WSR-88D Level II DZ – 8 Bit Reflectivity DV – 8 Bit Velocity No Storm Relative Product Yet

DZ - 8 Bit Reflectivity Radar mode invariant 90 dBZ.54 nm res thru 248 nm Available at all VCP angles Factor of 5 larger file size than “Level IV” Z

DV – 8 Bit Velocity Ground relative Range >  120 kts.13 nm res to 124 nm Available at all VCP angles Factor of 10 larger file size than “Level IV” Velocity

Strengths Best resolutions from radar Very high detail spatially and in data magnitudes TVS Mesocyclones Microbursts Convective storm structures Gust front winds Rainfall rate assessment Boundaries Data artifact identification Algorithm validation / QC

Strengths Radar mode invariant Seamless transition at precipitation detection High reflectivities displayed in clear air mode Winter / bright band events No longer need to “force” clear air mode Convection

Limitations Large files sizes Narrowband loadshed threat LAN-to-LAN connection O.K. Cannot do image pairing and maintain product resolution Need procedures to display DZ and DV separately

Limitations Not delivered with suitable color tables No storm relative velocity May want to change menu labels to “Hi-Res” or the like High detail, especially in DV, may be confusing when viewing storms close to RDA

Case Examples WFO Davenport, Iowa WFO Springfield, Missouri Image capture credits: Ray Wolf (DVN), Evan Bookbinder (SGF)

Muscatine County – 21 Aug 2002 F1 Tornado 1.6 mile path Damage to farm, trees 8 bit velocity key to warning

Muscatine County – 21 Aug 2002 ZSRM DV

Wasola, MO – 13 Aug 2002 DZ DV

Wasola, MO – 13 Aug 2002 Closeup

Wasola, MO – 13 Aug 2002

Summary and Recommendations Develop color tables Target phenomena Boundaries, mesocyclones, gust fronts, rainfall rates, and so on Break points at important thresholds (50 dBZ or 50 knots) Use “interpolate” capability to add range of color See attached example tables

Example DZ Table dBZ (204,204,204) and 4.5 (96,96,96)....click interpolate 5 (32,96,128) and 19.5 (48, 208, 255)... click interpolate 20 (0,255,0) to 39.5 (0,76,0)...click interpolate 40 (255, 230,0) to 49.5 (255,128,0)....click interpolate 50 (255,0,0) to 59.5 (96,0,0)...click interpolate (255,255,255)...fill (144,48,208)...fill (255,32,255)...fill (255,0,128)...fill 80+ dBZ (0,255,150)...fill Example color tables from Evan Bookbinder, WFO SGF

Example DV Table Range Folding (far left color band) (128,0,208) kts (255,0,128) to (0,0,160)... click interpolate (0,0,160) to -70 (0,224,255)...click interpolate -69 to -60 (0,255,224)...click fill -59 to (160,255,208)...click fill (160,255,208) to -40 (0,255,0)... click interpolate -40 (0,255,0) to (16,96,16)... click interpolate (16,96,16) to -1 (112,128,112)...click interpolate 0 (144,128,144) to 10.5 (112,0,0)..click interpolate 10.5 (112,0,0) to 40 (255,0,0)...click interpolate 40 (255,0,0) to 48.6(255,0,128)...click interpolate 49.5 (255,0,144) to 59 (255,128,255)...click interpolate 59 (255,128,255)to 69 (255,196,255)...click interpolate 70 kts (255,96,0) to (255,255,0)...click interpolate

Summary and Recommendations Develop AWIPS Procedures! Build appropriate color table and maps into procedure Examples: 4 panel to compare multiple angles of DZ, DV 4 panel to compare TDA to lowest 4 angles of DV 4 panel to compare Z, DZ (or DR) with rain rate color table, OHP, and STP

Questions