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plot1=["z500.s","mslp"] |
Using either the hres_1x1.mv or hres_2x2.mv macro , plot some of these other maps to study the synoptic development. Note for example that there should not be a strong horizontal temperature gradient around Nadine (why?) and the winds should be stronger for Nadine than the cutoff.
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| borderColor | lightblue |
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| bgColor | lightlightblue |
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| titleBGColor | lightblue |
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| title | Isobaric maps |
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- "mslp", "wind10" : MSLP + 10m winds - interesting for Nadine's tracking and primary circulation
- "vo850", "mslp" : vorticity at 850hPa and MSLP - low level signature of Nadine and disturbance associated with the cutoff low.
- "r700", "mslp", : MSLP + relative humidity at 700hPa - with mid-level humidity of the systems.
- "t500", "z500" : Geopotential + temperature at 500hPa - large scale patterns, mid-troposphere position of warm Nadine and the cold Atlantic cutoff
- "t850", "z850" : Geopotential + temperature at 850hPa - lower level conditions, detection of fronts
- "pv320K", "mslp" : 320K potential vorticity (PV) + MSLP - upper level conditions, upper level jet and the cutoff signature in PV, interaction between Nadine and the cut-off low.
- "wind850", "w700" : Winds at 850hPa + vertical velocity at 700hPa (+MSLP) : focus on moist and warm air in the lower levels and associated vertical motion.
- 10m winds + total precipitation (+MSLP) : compare with Pantillon Fig.2., impact on rainfall over France.
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It would be instructive to view a cross-section through Nadine and the cutoff. Choose from the following (note the cross-section macro hres_xs.mv uses slightly different names for the parameters)
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| bgColorborderColor | lightlightbluered |
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| titleBGColorborderStyle | lightblue | solid |
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Q. How strongly does Nadine appear to interact with the cutoff?
Q. What would you forecast to happen to Nadine?
Q. What is the fate of the cutoff low and what synoptic conditions did it create over France? |
Task 2: Precipitation over France
This task produces a plot similar to Figure 2 in Pantillon et al.
Choose a hres macro to use, plot the total precipitation (parameter: tp), near surface wind field, relative humidity (and any other parameters of interest).
As for the analyses, the macros hres_1x1.mv, hres_2x2.mv and hres_xs.mv can be used to plot and animate fields or overlays of fields from the HRES forecast.
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Q. Was it a good or bad forecast? Why? |
Suggested plots for discussion
The following is a list of parameters and plots that might be useful to produce for later group discussion. Choose a few plots and use both the HRES forecast and the analyses.
| title | Vertical cross-sections |
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- "pt", "pv" : Potential temperature + potential vorticity to characterize the cold core and warm core structures of Hurricane Nadine and the cut-off low.
- "r", "w" : Humidity + vertical motion : another view of the cold core and warm core structures of Hurricane Nadine and the cut-off low.
- "pv", "w" ("r") : Potential vorticity + vertical velocity (+ relative humidity) : a classical cross-section to see if a PV anomaly is accompanied with vertical motion or not.
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You do not need to plot all of these maps. Focus on what interests you and prepare some plots for group discussion.
For help on For help on how to save images, see the beginning of this tutorial.
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| bgColorborderColor | lightlightbluered |
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| titleBGColorborderStyle | lightblue |
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| title | Vertical cross-sections |
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| solid |
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Q. How strongly does Nadine appear to interact with the cutoff?
Q. What would you forecast to happen to Nadine?
Q. What is the fate of the cutoff low and what synoptic conditions did it create over France? |
Task 2: Precipitation over France
Choose a hres macro to use, plot the total precipitation (parameter: tp), near surface wind field (parameter: wind10), relative humidity (parameter: r) (and any other parameters of interest).
The macros hres_1x1.mv, hres_2x2.mv and hres_xs.mv can be used to plot and animate fields or overlays of fields from the HRES forecast.
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Q. What do you think about the quality of this forecast? And why? Potential temperature + potential vorticity: to characterize the cold core and warm core structures of Hurricane Nadine and the cut-off low.Humidity + vertical motion : another view of the cold core and warm core structures of Hurricane Nadine and the cut-off low.PV + vertical velocity (+ relative humidity) : a classical cross-section to see if a PV anomaly is accompanied with vertical motion or not. |
Exercise 3 : The operational ensemble forecasts
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