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Case Study: Ivan - September 2004

Case Study: Ivan - September 2004. Jared Klein – SUNY-Albany. 300 hPa Analyses : 1200 UTC 16 September 2004. Precipitable water (mm), 300 hPa h (dam), wind speed (m s −1 ), and div (10 −5 s −1 ). 300 hPa frontogenesis [K (100 km) − 1 (3 h) − 1 ], θ (K), and wind barbs (kt). 1.0° GFS.

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Case Study: Ivan - September 2004

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  1. Case Study: Ivan - September 2004 Jared Klein – SUNY-Albany

  2. 300 hPa Analyses: 1200 UTC 16 September 2004 Precipitable water (mm), 300 hPa h (dam), wind speed (m s−1), and div (10−5 s−1) 300 hPa frontogenesis [K (100 km)−1 (3 h)−1],θ(K), and wind barbs (kt) 1.0° GFS

  3. 300 hPa Analyses: 1200 UTC 17 September 2004 Frontogenesis in jet-entrance region Confluent flow in equatorward jet-entrance region Precipitable water (mm), 300 hPa h (dam), wind speed (m s−1), and div (10−5 s−1) 300 hPa frontogenesis [K (100 km)−1 (3 h)−1],θ(K), and wind barbs (kt) 1.0° GFS

  4. 300 hPa Analyses: 1200 UTC 18 September 2004 Strengthening downstream ULJ and ridge Strong frontogenesis in jet-entrance region Precipitable water (mm), 300 hPa h (dam), wind speed (m s−1), and div (10−5 s−1) 300 hPa frontogenesis [K (100 km)−1 (3 h)−1],θ(K), and wind barbs (kt) 1.0° GFS

  5. 925 hPa Analyses: 1200 UTC 16 September 2004 Pre-existing baroclinic zone Symmetric reflectivity structure WSI radar, 925 hPa θe (K) and wind barbs (kt) 925 hPa frontogenesis [K (100 km)−1 (3 h)−1],θ(K), and wind barbs (kt) 1.0° GFS

  6. 925 hPa Analyses: 1200 UTC 17 September 2004 Northeastward extension of precip field along baroclinic zone Band of frontogenesis along baroclinic zone WSI radar, 925 hPa θe (K) and wind barbs (kt) 925 hPa frontogenesis [K (100 km)−1 (3 h)−1],θ(K), and wind barbs (kt) 1.0° GFS

  7. 925 hPa Analyses: 1200 UTC 18 September 2004 Highest reflectivity near nose of LLJ/θe ridge axis Strong frontogenesis along warm frontal zone WSI radar, 925 hPa θe (K) and wind barbs (kt) 925 hPa frontogenesis [K (100 km)−1 (3 h)−1],θ(K), and wind barbs (kt) 1.0° GFS

  8. 925 hPa Q Vector Diagnosis: 0000 UTC 18 September 2004 Q Qn Qn div–con bands within frontal zone Qs Radar at 1200 UTC 17 September 2004 Radar at 0000 UTC 18 September 2004 Radar at 0000 UTC 18 September 2004 Highest reflectivity near strongest QG forcing for ascent WSI radar Qs div–con couplet within thermal trough–ridge 1.0° GFS Q vectors (10−10 K m−1 s−1 beginning at 2.5 × 10−11), θ(K) contoured in green, and Q div–con (10−15 K m−2 s−1) shaded in cool–warm colors

  9. 925 hPa Q Vector Diagnosis: 0600 UTC 18 September 2004 Q Qn Qs Radar at 1200 UTC 17 September 2004 Radar at 0000 UTC 18 September 2004 Radar at 0600 UTC 18 September 2004 Highest reflectivity near strongest QG forcing for ascent WSI radar 1.0° GFS Q vectors (10−10 K m−1 s−1 beginning at 2.5 × 10−11), θ(K) contoured in green, and Q div–con (10−15 K m−2 s−1) shaded in cool–warm colors

  10. 925 hPa Q Vector Diagnosis: 1200 UTC 18 September 2004 Q Qn Qs Radar at 1200 UTC 17 September 2004 Radar at 0000 UTC 18 September 2004 Radar at 1200 UTC 18 September 2004 Highest reflectivity near strongest QG forcing for ascent WSI radar 1.0° GFS Q vectors (10−10 K m−1 s−1 beginning at 2.5 × 10−11), θ(K) contoured in green, and Q div–con (10−15 K m−2 s−1) shaded in cool–warm colors

  11. Cross Section of Fn Magnitude: 0000 UTC 18 September 2004 Deep frontogenesis tilting toward cold air w/height 925–500 hPa layer-avg Fn vectors (10−10 K m−1 s−1), θ (K) contoured in green, and Fn div–con (10−15 K m−2 s−1) shaded in cool–warm colors Fn magnitude [K (100 km)−1 (3 h)−1] shaded in green–blue, RH shaded in orange, θ(K) contoured in gray, wind barbs (ms−1), and ω<0 (µb s−1) contoured in red 1.0° GFS

  12. Cross Section of Fn Magnitude: 1200 UTC 18 September 2004 Deep frontogenesis tilting toward cold air w/height 925–500 hPa layer-avg Fn vectors (10−10 K m−1 s−1), θ (K) contoured in green, and Fn div–con (10−15 K m−2 s−1) shaded in cool–warm colors Fn magnitude [K (100 km)−1 (3 h)−1] shaded in green–blue, RH shaded in orange, θ(K) contoured in gray, wind barbs (ms−1), and ω<0 (µb s−1) contoured in red 1.0° GFS

  13. NPVU QPE 0000 UTC 18 September 2004 Heaviest 6-h precip along and on cold side of surface boundary 6-h precipitation (in) ending at 0600 UTC 18 September 2004 Flow of tropical air into surface boundary Fn vectors (10−10 K m−1 s−1 beginning at 1.0 × 10−10), θ(K) contoured in green, streamlines contoured in black, and Fn div–con (10−14 K m−2 s−1) shaded in cool–warm colors 0600 UTC 18 September 2004 ~0.6° surface data

  14. NPVU QPE 0600 UTC 18 September 2004 Heaviest 6-h precip along and on cold side of surface boundary 6-h precipitation (in) ending at 1200 UTC 18 September 2004 Flow of tropical air into surface boundary Fn vectors (10−10 K m−1 s−1 beginning at 1.0 × 10−10), θ(K) contoured in green, streamlines contoured in black, and Fn div–con (10−14 K m−2 s−1) shaded in cool–warm colors 1200 UTC 18 September 2004 ~0.6° surface data

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