Real-Time QG Diagnostics

Department of Atmospheric Sciences, Institute of Atmospheric Physics, University of Arizona


Real-Time Analyses and Forecasts of the Quasi-Geostrophic (QG) Diagnostic Equations

- General Description
- Users' Guides
- Animation Builder
- References

General Description

The analysis and forecast animations created here (using GEMPAK version 7.2) are produced by the Department of Atmospheric Sciences at the University of Arizona. All fields are computed using 6-hourly pressure-level data from the 1.0x1.0 degree National Center for Environmental Prediction-Global Forecast System (NCEP-GFS) forecasts out to 144-hours. The raw NCEP-GFS data was smoothed using a Gaussian filter with a weight of 25, unless otherwise noted, to produce cleaner results for the QG diagnostics. Diagnostics are computed globally, but are displayed in the subdomain chosen by the user. A detailed description of the fields displayed on each set of images is provided in the Users' Guides, and as headers and captions on the animations themselves. While every attempt is made to keep the images up-to-date, it is possible that there will be interruptions to the image generation services as system updates occur.

The intended purpose of this real-time diagnostics web page is to provide an interactive tool that can be used to enhance classroom education and/or weather discussions in both the academic and operational environment.

An archive of the QG maps for the 25-27 March 2014 coastal "bomb" is available here.

Brief Users' Guides for the QG Equations

- Sutcliffe Development Theory
- Sutcliffe-Petterssen Development Theory
- QG Height Tendency Equation
- QG Omega Equation
- QG Energetics [users' guide not yet available, see Lackmann (2011), p. 57-65]

Animation Builder

Use the matrix to select the field you wish to animate. Each animation includes a 10-day analysis archive, while a subset of the animations (highlighted in blue) include the most recent 144-hour forecast. The verifying date and time is displayed on the lower part of the image as YYMMDD/HHNNVFFF, where YY=year, MM=month, DD=day, HH=hour, NN=minute, and FFF=forecast hour.

Sutcliffe Development Theory animations:
1000 hPa Height, 1000-500 hPa Thickness, 1000 hPa Geostrophic Relative Vorticity [analysis only]
10-day archive:
North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, 1000-500 hPa Thermal Vorticity [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, Total RHS Sutcliffe Development theory [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, Term A Sutcliffe Development theory [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, Term B Sutcliffe Development theory [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, Term C Sutcliffe Development theory [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere

Sutcliffe-Petterssen Development Theory animations:
500 hPa Height, Temperature, and Geostrophic Relative Vorticity [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, Temperature, and Vertical Motion [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, and Total RHS Sutcliffe-Petterssen Development Theory [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, and Term A Sutcliffe-Petterssen Development Theory [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, and Term B Sutcliffe-Petterssen Development Theory [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
1000 hPa Height, 1000-500 hPa Thickness, and Term C Sutcliffe-Petterssen Development Theory [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere

QG Height Tendency Equation animations:
500 hPa Height, Wind, and Geostrophic Absolute Vorticity [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, Temperature, and Wind [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Height, Temperature, and Wind [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
300 hPa Height, Temperature, and Wind [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Height, 700-300 hPa Thickness, and Total RHS Traditional Height Tendency Equation [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Height, 700-300 hPa Thickness, and Term A Traditional Height Tendency Equation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Height, 700-300 hPa Thickness, and Term B Traditional Height Tendency Equation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Height, Wind, and Quasigeostrophic Potential Vorticity (QGPV) [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Height, QGPV, and Total RHS QGPV Height Tendency Equation [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere

QG Omega Equation animations:
700 hPa Height, Relative Humidity, and Vertical Motion [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, 900-500 hPa Thickness, and Total RHS Traditional Omega Equation [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, 900-500 hPa Thickness, and Term A Traditional Omega Equation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, 900-500 hPa Thickness, and Term B Traditional Omega Equation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, 900-500 hPa Thickness, and 700 hPa Geostrophic Relative Vorticity [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, 900-500 hPa Thickness, and Total RHS Sutcliffe-Trenberth Omega Equation [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, Temperature, Q-vectors, and Total RHS Q-vector Omega Equation [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, Temperature, and Total RHS Q-vector Omega Equation [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, Temperature, and Term A Q-vector Omega Equation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
700 hPa Height, Temperature, and Term B Q-vector Omega Equation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere

QG Energetics animations:
500 hPa Height and Height Perturbation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Eddy Kinetic Energy, Height Perturbation, and Geostrophic Wind Perturbation [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Height Perturbation, Ageostrophic Geopotential Flux Vectors and Divergence [analysis and forecast]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Temperature Perturbation and Baroclinic Energy Conversion [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere
500 hPa Geostrophic Wind Perturbation, Mean Geostrophic Wind u-component, and Barotropic Energy Conversion [analysis only]
10-day archive: North America || Western Hemisphere || Eastern Hemisphere
3-day archive: North America || Western Hemisphere || Eastern Hemisphere

References

Bluestein, H. B., 1992: Principles of Kinematics and Dynamics. Vol. I. Synoptic-Dynamic Meteorology in Midlatitudes. Oxford University Press, 431 pp.
Bosart, L. F., G. J. Hakim, K. R. Tyle, M. A. Bedrick, W. E. Bracken, M. J. Dickinson, and D. M. Schultz, 1996: Large-Scale antecedent conditions associated with the 12-14 March 1993 cyclone ("Superstorm '93") over eastern North America. Mon. Wea. Rev., 124, 1865-1891.
Carlson, T. N., 1998: Mid-Latitude Weather Systems. Amer. Meteor. Soc., 507 pp.
Durran, D. R., and L. W. Snellman, 1987: The diagnosis of synoptic-scale vertical motion in an operational environment. Wea. Forecasting, 2, 17-31.
Hakim, G. J., L. F. Bosart, and D. Keyser, 1995: The Ohio Valley wave-merger cyclogenesis event of 25-26 January 1978. Part I: Multiscale case study. Mon. Wea. Rev., 123, 2663-2692.
Holton, J. R., 2004: An Introduction to Dynamic Meteorology. 4th ed. Academis Press, 535 pp.
Hoskins, B. J., I. Draghici, and H. C. Davies, 1978: A new look at the omega equation. Quart. J. Roy. Meteor. Soc., 104, 31-38.
Keyser, D., M. J. Reeder, and R. J. Reed, 1988: A generalization of Petterssen's frontogenesis function and its relation to the forcing for vertical motion. Mon. Wea. Rev., 116, 762-780.
Lackmann, G., 2011: Midlatitude Synoptic Meteorology: Dynamics, Analysis, and Forecasting. Amer. Meteor. Soc., 345 pp.
Martin, J. E., 2006: Mid-Latitude Atmospheric Dynamics: A First Course. John Wiley & Sons, Ltd, 324 pp.
Petterssen, S., 1956: Motion and Motion Systems. Vol. I. Weather Analysis and Forecasting. McGraw-Hill, 428 pp.
Sanders, F., and B. J. Hoskins, 1990: An easy method for estimation of Q-vectors on weather maps. Wea. Forecasting, 5, 346-353.
Sutcliffe, R. C., 1947: A contribution to the problem of development. Quart. J. Roy. Meteor. Soc., 73, 370-383.
Sutcliffe, R. C., and A. G. Forsdyke, 1950: The theory and use of upper air thickness patterns in forecasting. Quart. J. Roy. Meteor. Soc., 76, 189-217.
Trenberth, K. E., 1978: On the interpretation of the diagnostic quasi-geostrophic omega equation. Mon. Wea. Rev., 106, 131-137.

Additional web links

Real-Time, high-resolution GFS analysis animations (University at Albany; R. McTaggart-Cowan)
GFS and NAM analyses and forecasts (University of Utah)
Isentropic PV and tropopause maps (University of Washington; G. Hakim)
Large scale analyses from ECMWF (University of Reading)
GFS analysis PV, irrotational wind, and jet interaction animations (University at Albany; H. Archambault)
GFS forecast maps and D(prog)/Dt (University at Albany; K. Griffin)
GFS dynamic tropopause and IVT animations (Plymouth State University; J. Cordeira)
Radiosonde histograms (Plymouth State University; J. Cordeira)
GFS regional weather maps (North Atlantic and Africa) (University at Albany; M. Janiga)


**********************************************************************

Questions or Comments? Contact Thomas Galarneau
Thomas Galarneau || Department of Atmospheric Sciences