ClimateGlobalChange / tempestextremes

Extreme weather detection and characterization
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Low pressure system detection after pressure depression maximum #69

Open wreckdump opened 7 months ago

wreckdump commented 7 months ago

I was wondering if there is a way to detect a low pressure system after once the system hit the lowest pressure and starts to bound back up. For example. I am trying to recreate storm system YAGI (2013-06-06 18H - 2013-06-16 06H; https://ibtracs.unca.edu/index.php?name=v04r00-2013158N13129). The TE only seems to detect the pressure decrease, and not be able to detect nodes once the pressure starts to increase local pressure minimum within the search radius. Is there a way to achieve this?

The following are the commands that I am using.

mpiexec -n 10 DetectNodes --in_data_list if.txt \
                          --timefilter "3hr" \
                          --out_file_list of.txt \
                          --searchbymin PSFC \
                          --thresholdcmd "VOR850,>=,0.000035,0.0" \
                          --mergedist 6.0 \
                          --minlon 190 \
                          --maxlon 90  \
                          --minlat 60  \
                          --maxlat 0   \
                          --outputcmd "PSFC,min,0;_VECMAG(U10m,V10m),max,2;ZSFC,min,0" \
                          --logdir "~/te/logs"
wreckdump commented 7 months ago

e5.trk.yagi.wp.pdf ibt.trk.yagi.wp.pdf

zarzycki commented 2 months ago

Please try using sea level pressure and not absolute surface pressure. DetectNodes is probably getting confused by static low pressure minima associated with elevated orography over Japan. Sea level pressure will alleviate this issue.

DetectNodes has no "time" connectivity, so it would not know what the previous pressure would be (therefore, the fact it's only tracking during pressure drops would seem to be a total coincidence).