comparisons of ruc 20km with/without tamdar
DESCRIPTION
Comparisons of RUC 20km with/without TAMDAR. Sounding comparison - TAMDAR ascent vs. Dev for Jan 31, 2005. Winds 180 degrees off from about 700mb to 500mb. As AirDat data became cleaner, these types of cases became more rare. - PowerPoint PPT PresentationTRANSCRIPT
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Comparisons of RUC 20km with/without TAMDAR
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Sounding comparison - TAMDAR ascent vs. Dev for Jan 31, 2005.Winds 180 degrees off from about 700mb to 500mb.
As AirDat data became cleaner, these types of cases became more rare.
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Yellow contours: RH differences (absolute) beginning at 10% and continuing at 10% intervals
White contours: Wind RMS differences beginning at 2 and continuing at intervals of 1
Shaded colors: Temp differences in degrees C (colorbar scale)
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• Some impact could possibly be able to be seen with RH at off-synoptic times.
• Comparison of cloud analyses, particularly cloud bases may reveal effect of TAMDAR RH observations.
• A preliminary attempt at verification using satellite visible images.
• NOTE: These examples are speculative and marginal.
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April 4,2005 00Z
Some RH difference is outlined in NW MN
Also some difference in E IA
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Dev and Dev2 Cloud base height analysis comparisonBases between 5000ft-1000ft in central and northern MN
are farther east in Dev than in Dev2Also, bases are farther east in IA in Dev2 than in Dev
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00:15Z Visible Satellite image more closely resembles the cloud analysis for Dev2 than Dev in northern MN and in IA
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April 5, 2005 18Z
Difference plot shows RH differences in northern MS, AL, southern TN, eastern AR.
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Dev and Dev2 Cloud base height analysis comparisonDev2 shows more bases between 15000ft and 20000ft in
SW KY, NW TNAlso more bases in MS, AL
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18:15Z Visible Satellite image shows clouds in SW KY, NW TN, and nearly all of MS is cloudy with streaks in central AL.
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April 8, 2005 18ZFormat changed -Blue contours
replace yellow contours for RH differences
White contours: Wind RMS differences beginning at 2, increasing by intervals of 2
500 mb: (approx. 18000 ft) shows RH differences over northern MN
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Dev and Dev2 Cloud base height analysis comparisonMore clouds in NW MN in Dev2
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Clouds in northern MN reflect Dev2 analysis
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Preliminary Conclusions• TAMDAR RH observations seem to be having
some positive impact to the RUC model cloud analysis (may be more noticeable in the convective season, especially with cloud forecasts).
• Wind and temperature measurements can, and probably are, also having positive effects as sensors are “fine tuned”.
• More study is needed to determine if observations of icing and turbulence are providing positive impact.
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