scan scan system for convection analysis and nowcasting operational use refresher tom filiaggi...
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SCANSCANSystem for Convection Analysis and Nowcasting
Operational Use Refresher
& Lingyan [email protected]
Decision Assistance BranchMeteorological Development Laboratory
August, 2009
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Agenda Graphical Elements
Main Display: Cell Table, Icon graphic Including Alarm functions
QPF displays SCAN CWA Threat Index SCAN Data Monitoring System (DMS)
‘Recently’ Fielded Functionality Unwarned Storm Cell DMD Display and enhanced Time-Height Service Backup enhancement MDA: Mesocyclone Detection Algorithm Time of Arrival Tool Hail Diagnostics (ie: VIL Density)
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
SCAN Menu Contents
Storm Cells / Site Storm Threat• Tabular data from Cells, Mesos, TVSs• Graphic Icon D2D image
Storm DMD Icons & Table• Tabular data and graphic Icons for DMDs
QPF from . . .• Probabilistic and categorical contours
SCAN CWA Threat Index (SCTI)• Color grid with arbitrary rules
Hail Diagnostics• Several forms to choose from
Precipitation Rate• Straight conversion of DHR radar product to rain rate
(via Z/R)
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Graphical ElementsMain Display
Storm Cell Table, including:• Storm Cell Trends• Color Thresholds• Alarms
D2D graphic, including:• Storm Cell Icons• Local Site Threat Icons
Storm Cell Monitor
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Graphical Storm CellIcons
ConfigurationElements
Tabular Storm CellPresentation
Rate of Change andAbsolute Alarms
Storm Cell Attribute Time Trends
Severe WeatherMonitor
Local Site Threats
Storm Cell Identification Display (SCID) Window
Launched from the Configurations menu
Controls zoom factor of inspected cell
Modify how D2D displays storm cells
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
The Attribute Color Threshold (ACT) Window
Controls color coding of trends, table body cells
Launched in two ways:• From the Configurations
menu, box colors submenu• Right-clicking on a storm
attribute label
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Alarm Functions
Alarm information window• Alerts user to temporal
increases in an attribute that exceed a user set threshold
• Left-click invokes trend and zoom
Rate of Change Alarm and Absolute Alarm Threshold Window• Modify the thresholds needed
to set off alarms• In the Configurations menu
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Alarm Functions (cont’d)
New Alarm Time Setup Window• Sets time thresholds
for new alarmsAlarm controls
accessed through the Configurations menu
Message sent through Guardian
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
1 Hour QPF: Probabilistic & Categorical
Categorical• Contours up to
0.7 inches
Probabilistic• Probability
contours for various thresholds of accumulation
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
SCAN CWA Threat Index
Arbitrary Thresholds• Utilizing TVS,
Meso, and Storm Cell traits
Colored Grid• Traffic light• Sampled text
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
SCAN Data Monitoring System
Monitor the status of SCAN data inputs residing on your Data Server
Use display workstation Netscape browser
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Recently Fielded Functionality
Unwarned Unwarned Storm CellStorm Cell
User-defined Thresholds
Checks storm cell locations against existing warnings
Changes Storm Cell ID foreground color in the SCAN Storm Cell Table
OB3/8.1OB3/8.1
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Recently Fielded Functionality
Digital Meso Digital Meso Detection Detection (DMD)(DMD)
Similar to Storm Cell Table (Table, Trends, Display icons)
Time-Height Trends! Rapid Update (every
elevation scan in about 20 seconds)
Time Height Trend Enhancement (OB7)
OB4OB4
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Recently Fielded Functionality
Time of ArrivalTime of Arrival Tool much like
Speed/Distance Point, Line, and
Poly-line modes, and circular front
Local and UTC time
OB6OB6
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
Recently Fielded Functionality
Hail DiagnosticsHail Diagnostics VIL Density –
(VIL / Echo Top x 1000)
Experimental product to detect severe hail
Enhanced 1km VIL Density that dilates echo tops
OB6OB6
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
- - - Summary - - -
SCAN’s value is expected to vary, depending on:
Convective ScenarioForecaster’s needs and expectationsElements utilizedForecaster’s Familiarity with SCAN’s functionsForecaster’s Familiarity with Radar Meteorology
Therefore, NWS forecasters should:Use SCAN for what it is good for (which is subjective).Do not expect SCAN to tell you when to Warn and when
not to Warn.Focus on the human requirement in Decision Making. Let
SCAN automate the things that are automate-able.Use SCAN as a Decision Assistance Tool
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009
SCAN Website
Additional Information can be found on the SCAN website:
http://www.nws.noaa.gov/mdl/scan
http://www.nws.noaa.gov/mdl/scan
SCAN: 4th Regional Severe Storms / Radar and Hydrology Conference Overview, August 2009