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Real Time High-Resolution NWP @ McGill University. J. Gyakum 1 , R. McTaggart-Cowan 1 , P. Sisson 2. 1 McGill University. 2 National Weather Service. Objectives. Implementation of a real time MC2 system Data collection for stat-istical analysis and case studies

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Real Time High-Resolution NWP @ McGill University


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real time high resolution nwp @ mcgill university

Real Time High-Resolution NWP @ McGill University

J. Gyakum1, R. McTaggart-Cowan1, P. Sisson2

1 McGill University

2 National Weather Service

objectives
Objectives
  • Implementation of a real time MC2 system
  • Data collection for stat-istical analysis and case studies
  • Investigate impacts of high-resolution modelling on QPF and near-surface winds
outline
Outline
  • Need for mesoscale modelling
  • Description of NWP system
  • Validation case study

(27 September 2002)

  • Project timeline and ongoing upgrades
high resolution 3km
High Resolution (3km)
  • Accurate topography
  • Improved wind fields and fluxes
  • Model terrain-induced confluence
mesoscale orography
Mesoscale Orography

High resolution (6 km)

Degraded resolution (~100 km)

model description
Model Description
  • MC2 version 4.9.5
  • Non-hydrostatic, semi-implicit time step, semi-Lagrangian advection
  • Full physics version 3.72
  • Three one-way nest domains
computational platform
Computational Platform
  • NEC SX-6/8M10 super-computer maintained by RPN/CMC
  • 10x8 PE nodes
  • Theoretical peak performance 10x64 GFlop
performance timeline
Performance Timeline

Domain 1 (36km)

Domain 2 (12km)

Domain 3 (3km)

0000 UTC

0300 UTC

0600 UTC

0900 UTC

CMC Regional Forecast

McGill Real Time Mesoscale Cascade

All runs completed by 0330 Eastern Standard Time

production suite
Synoptic

Mesoscale

Production Suite

Traditional upper-level forcings and QG dynamics

Visualization of processes and forcings occurring at small scales

production suite11
SynopticProduction Suite

Traditional upper-level forcings and QG dynamics

dynamic tropopause potential temperature

production suite12
SynopticProduction Suite
  • dynamic tropopause 

Traditional upper-level forcings and QG dynamics

isentropic potential vorticity

production suite13
SynopticProduction Suite
  • dynamic tropopause 
  • isentropic potential vorticity

Traditional upper-level forcings and QG dynamics

coupling index

dt - e(bl)

production suite14
SynopticProduction Suite
  • dynamic tropopause 
  • isentropic potential vorticity
  • coupling index

Traditional upper-level forcings and QG dynamics

moisture transport

production suite15
SynopticProduction Suite
  • dynamic tropopause 
  • isentropic potential vorticity
  • coupling index
  • moisture transport

Traditional upper-level forcings and QG dynamics

moisture flux divergence

production suite16
SynopticProduction Suite
  • dynamic tropopause 
  • isentropic potential vorticity
  • coupling index
  • moisture transport
  • moisture flux divergence

Traditional upper-level forcings and QG dynamics

Non-standard synoptic output available on 36 and 12 km domains (1 & 2)

production suite17
MesoscaleProduction Suite

Visualization of processes and forcings occurring at small scales

frontogenesis function and terms

production suite18
MesoscaleProduction Suite
  • frontogenesis function

Visualization of processes and forcings occurring at small scales

high-resolution convective and explicit precip-itation

production suite19
MesoscaleProduction Suite
  • frontogenesis function
  • high resolution precipitation

Visualization of processes and forcings occurring at small scales

high resolution vertical motion fields

production suite20
MesoscaleProduction Suite
  • frontogenesis function
  • high resolution precipitation
  • high resolution vertical motion

Visualization of processes and forcings occurring at small scales

cross-sectional plots of various thermodynamic variables

production suite21
MesoscaleProduction Suite
  • frontogenesis function
  • high resolution precipitation
  • high resolution vertical motion
  • thermodynamic cross-sections

Visualization of processes and forcings occurring at small scales

cross-sectional plots of frontal circulations

production suite22
MesoscaleProduction Suite
  • frontogenesis function
  • high resolution precipitation
  • high resolution vertical motion
  • thermodynamic cross-sections
  • frontal circulations

Visualization of processes and forcings occurring at small scales

Mesoscale visualization tools available on 12 and 3 km domains (2 & 3)

case study 2 may
Case Study (2 May)

GOES-East Water vapour 0000UTC 2 May

precipitation structure

Domain 2 (12 km)

Precipitation Structure

Radar Observations

Model Rain Rate

0900 UTC 2 May 2002 (initialized 0000 1 May)

precipitation structure25

Domain 2 (12 km)

Precipitation Structure

Radar Observations

Model Rain Rate

1200 UTC 2 May 2002 (initialized 0000 1 May)

project timeline

March

September

March

September

2002

2003

Project Timeline

model implementation

McGill-side storage structure

analysis tool construction

visualization design

web interface construction

gridded data transfers

AWIPS implementation

real time modelling

completed

in progress

planned

case study 27 sept
Case Study (27 Sept)

GOES-East Water vapour (0000 UTC 27 Sept)

precipitation
Precipitation

Domain 1 (36km) total 24 hour rainfall ending 1200 UTC 28 Sept

precipitation29
Precipitation

Observed total 24 hour rainfall ending 1200 UTC 28 Sept

precipitation30
Precipitation

Domain 2 (12km) total 24 hour rainfall ending 1200 UTC 28 Sept

precipitation31
Precipitation

Domain 3 (3km) total 24 hour rainfall ending 1200 UTC 28 Sept

precipitation32
Precipitation

Domain 3 (3km) total 24 hour rainfall ending 1200 UTC 28 Sept

dynamic tropopause
Dynamic Tropopause

McGill 24h forecast

RUC analysis 00Z 28

Potential Temperature

project timeline36
Project Timeline

model implementation

McGill-side storage structure

analysis tool construction

web interface construction

visualization design

real time modelling

March

June

September

December

2002

2003

completed

in progress

planned

radar imagery
Radar Imagery

0814 UTC 31 March

ibl development
IBL Development

YUL

BTV

Lake Champlain

summary
Summary
  • Implementation of real time mesoscale NWP is under way at McGill
  • High resolution (3 km) will enhance mesoscale flow and QPF forecasts for the St. Lawrence / NE states region
data access
Data Access
  • http://132.206.43.151:5080
  • Grib files available to ftp servers upon request to:

rmctc@zephyr.meteo.mcgill.ca