Climate Dynamics

, Volume 36, Issue 3–4, pp 793–810 | Cite as

Climatology of summer midtropospheric perturbations in the U.S. northern plains. Part I: influence on northwest flow severe weather outbreaks

Article

Abstract

Northwest flow severe weather outbreaks (NWF outbreaks) describe a type of summer convective storm that occurs in areas of mid-level NWF in the central United States. Convective storms associated with NWF outbreaks often travel a long distance systematically along a northwest-southeast oriented track across the northern plains. Previous studies have observed that these migrating convective storms are frequently coupled with subsynoptic-scale midtropospheric perturbations (MPs) initiated over the Rocky Mountains. This study traces MPs for the decade of 1997–2006 using the North American Regional Reanalysis to examine their climatology and possible influence on NWF outbreaks. MPs are characterized by a well organized divergent circulation with persistent ascending motion at the leading edge promoting convection. The divergent circulation is further enhanced by low-level convergence along the northern terminus of the Great Plains low-level jet. The downstream propagation of MPs assists in forming the progressive feature of the associated convective storms. MPs have a maximum frequency in July, consistent with NWF outbreaks. In July and August, the fully developed North American anticyclone produces prevailing NWF over the northern plains, where up to 60% of rainfall and storm reports are linked to MPs. The movement, timing and rainfall distribution of MPs remarkably resemble those of NWF outbreaks. When encountering strong low-level jets, ascending motion and convergence of water vapor flux associated with MPs intensify considerably and precipitation is greatly enhanced. It is likely that NWF outbreaks are generated whenever MPs occur in association with strong low-level jets.

Keywords

Midtroposphere Wave Progressive MCS Severe weather outbreak Low level jet 

References

  1. Ahijevych DA, Davis CA, Carbone RE, Tuttle JD (2004) Initiation of precipitation episodes relative to elevated terrain. J Atmos Sci 61:2763–2769CrossRefGoogle Scholar
  2. Ashley WS, Mote TL, Bentley ML (2005) On the episodic nature of derecho-producing convective systems in the United States. Int J Climatol 25:1915–1932CrossRefGoogle Scholar
  3. Ashley WS, Mote TL, Bentley ML (2007) An extensive episode of derecho-producing convective systems in the United States during May–June 1998: a multi-scale analysis and review. Meteorol Appl 14:227–244CrossRefGoogle Scholar
  4. Barlow M, Nigam S, Berbery EH (1998) Evolution of the North American Monsoon system. J Clim 11:2238–2257CrossRefGoogle Scholar
  5. Barnes SL, Caracena F, Marroquin A (1996) Extracting synoptic-scale diagnostic information from mesoscale models: the Eta model, gravity waves, and quasigeostrophic diagnostics. Bull Am Meteorol Soc 77:519–528CrossRefGoogle Scholar
  6. Bartels DL, Maddox RA (1991) Midlevel cyclonic vortices generated by mesoscale convective systems. Mon Weather Rev 119:104–118CrossRefGoogle Scholar
  7. Bentley ML, Mote TL (1998) A climatology of derecho-producing mesoscale convective systems in the central and eastern United States, 1986–95. Part I: temporal and spatial distribution. Bull Am Meteorol Soc 79:2527–2540CrossRefGoogle Scholar
  8. Bonner WD (1968) Climatology of the low level jet. Mon Weather Rev 96:833–850CrossRefGoogle Scholar
  9. Bosart LF, Sanders F (1981) The Johnstown flood of July 1977: a long-lived convective system. J Atmos Sci 38:1616–1642CrossRefGoogle Scholar
  10. Braun SA, Houze RA (1996) The heat budget of a midlatitude squall line and implications for potential vorticity production. J Atmos Sci 53:1217–1240CrossRefGoogle Scholar
  11. Carbone RE, Tuttle JD (2008) Rainfall occurrence in the U.S. warm season: the diurnal cycle. J Clim 21:4132–4146CrossRefGoogle Scholar
  12. Carbone RE, Tuttle JD, Ahijevych DA, Trier SB (2002) Inferences of predictability associated with warm season precipitation episodes. J Atmos Sci 59:2033–2056CrossRefGoogle Scholar
  13. Changnon SA, Kunkel KE (1999) The record 1996 rainstorm at Chicago. J Appl Meteorol 38:257–265CrossRefGoogle Scholar
  14. Chen TC, Wang SY, Clark AJ (2008) North Atlantic hurricanes contributed by African easterly waves north and south of the African easterly jet. J Clim 21:6767–6776CrossRefGoogle Scholar
  15. Clark AJ, Gallus WA, Chen TC (2007) Comparison of the diurnal precipitation cycle in convective-resolving and non-convection-resolving mesoscale models. Mon Weather Rev 135:3456–3473CrossRefGoogle Scholar
  16. Coniglio MC, Stensrud DJ (2001) Simulation of a progressive derecho using composite initial conditions. Mon Weather Rev 129:1593–1616CrossRefGoogle Scholar
  17. Coniglio MC, Stensrud DJ, Richman MB (2004) An observational study of derecho-producing convective systems. Weather Forecast 19:320–337CrossRefGoogle Scholar
  18. Danielsen EF (1968) Stratospheric–tropospheric exchange based on radioactivity, ozone and potential vorticity. J Atmos Sci 25:502–518CrossRefGoogle Scholar
  19. Davis CA, Ahijevych DA, Trier SB (2002) Detection and prediction of warm season midtropospheric vortices by the rapid update cycle. Mon Weather Rev 130:24–42CrossRefGoogle Scholar
  20. Davis CA, Manning KW, Carbone RE, Trier SB, Tuttle JD (2003) Coherence of warm-season continental rainfall in numerical weather prediction models. Mon Weather Rev 131:2667–2679CrossRefGoogle Scholar
  21. Doswell CA, Bosart LF (2001) Extratropical synoptic-scale processes and severe convection. In: Doswell CA (ed) Severe convective storms, Meteorol. Monogr. 27, No. 49, American Meteorological Society, pp 27–69Google Scholar
  22. Endlich RM (1967) An iterative method for altering the kinematic properties of wind fields. J Appl Meteorol 6:837–844CrossRefGoogle Scholar
  23. Fritsch JM, Carbone RE (2004) Improving quantitative precipitation forecasts in the warm season: a USWRP research and development strategy. Bull Am Meteorol Soc 85:955–965CrossRefGoogle Scholar
  24. Gallus WA, Snook NA, Johnson EV (2008) Spring and summer severe weather reports over the Midwest as a function of convective mode: a preliminary study. Weather Forecast 23:101–113CrossRefGoogle Scholar
  25. Hertenstein RF, Schubert WH (1991) Potential vorticity anomalies associated with squall lines. Mon Weather Rev 119:1663–1672CrossRefGoogle Scholar
  26. Higgins WR, Yao Y, Wang XL (1997) Influence of the North American Monsoon System on the United States summer precipitation regime. J Clim 10:2600–2622CrossRefGoogle Scholar
  27. Hillaker HJ, Waite PJ (1985) Crop-hail damage in the Midwest Corn Belt. J Appl Meteorol 24:3–15CrossRefGoogle Scholar
  28. Holton JR (2004) An introduction to dynamic meteorology, 4th edn. Academic Press, New York, p 535Google Scholar
  29. Jankov I, Gallus WA (2004) MCS rainfall forecast accuracy as a function of large-scale forcing. Weather Forecast 19:428–439CrossRefGoogle Scholar
  30. Jiang X, Lau NC, Held IM, Klein SA (2006) Role of eastward propagating convection systems in the diurnal cycle and seasonal mean of summertime rainfall over the U.S. Great Plains, Geophys Res Lett 33: L19809-00. doi:10.1029/2006GL027022
  31. Johns RH (1982) A synoptic climatology of northwest flow severe weather outbreaks. Part I: nature and significance. Mon Weather Rev 110:1653–1663CrossRefGoogle Scholar
  32. Johns RH (1984) A synoptic climatology of northwest flow severe weather outbreaks. Part II: meteorological parameters and synoptic patterns. Mon Weather Rev 112:449–464CrossRefGoogle Scholar
  33. Johns RH (1993) Meteorological conditions associated with bow echo development in convective storms. Weather Forecast 8:294–299CrossRefGoogle Scholar
  34. Johns RH, Hirt WD (1987) Derechos: widespread convectively induced windstorms. Weather Forecast 2:32–49CrossRefGoogle Scholar
  35. Kalnay E et al (1996) The NCEP/NCAR 40-Year Reanalysis Project. Bull Am Meteorol Soc 77:437–471CrossRefGoogle Scholar
  36. Knievel JC, Johnson RH (2002) The kinematics of a midlatitude, continental mesoscale convective system and its mesoscale vortex. Mon Weather Rev 130:1749–1770CrossRefGoogle Scholar
  37. Lin Y, Mitchell KE (2005) The NCEP Stage II/IV hourly precipitation analyses: development and applications. In: 19th Conference on Hydrology, American Meteorological Society, San Diego, CA, 9–13 January 2005, Paper 1.2, PreprintsGoogle Scholar
  38. Maddox RA, Chappell CF, Hoxit LR (1979) Synoptic and mesoalpha scale aspects of flash flood events. Bull Am Meteorol Soc 60:115–123CrossRefGoogle Scholar
  39. Menard RD, Fritsch JM (1989) An MCC-generated inertially stable warm core vortex. Mon Weather Rev 117:1237–1261CrossRefGoogle Scholar
  40. Mesinger F et al (2006) North American regional reanalysis. Bull Am Meteorol Soc 87:343–360CrossRefGoogle Scholar
  41. Moller AR (2001) Severe local storms forecasting. In: Doswell CA (ed) Severe convective storms. Meteorol Monogr, 27, No. 49, American Meteorological Society, pp 433–480Google Scholar
  42. Schmidt JM, Cotton WR (1989) A High Plains squall line associated with severe surface winds. J Atmos Sci 46:281–302CrossRefGoogle Scholar
  43. Segal M, Garratt J, Kallos G, Pielke R (1989) The Impact of wet soil and canopy temperatures on daytime boundary-layer growth. J Atmos Sci 46:3673–3684CrossRefGoogle Scholar
  44. Smull BF, Augustine JA (1993) Multiscale analysis of a mature mesoscale convective complex. Mon Weather Rev 121:103–132CrossRefGoogle Scholar
  45. Stensrud DJ (1996) Importance of low-level jets to climate: a review. J Clim 9:1698–1711CrossRefGoogle Scholar
  46. Trier SB, Parsons DB (1993) Evolution of environmental conditions preceding the development of a nocturnal mesoscale convective complex. Mon Weather Rev 121:1078–1098CrossRefGoogle Scholar
  47. Trier SB, Davis CA, Tuttle JD (2000) Long-lived mesoconvective vortices and their environment. Part I: observations from the central United States during the 1998 warm season. Mon Weather Rev 128:3376–3395CrossRefGoogle Scholar
  48. Trier SB, Davis CA, Ahijevych DA, Weisman ML, Bryan GH (2006) Mechanisms supporting long-lived episodes of propagating nocturnal convection within a 7-Day WRF model simulation. J Atmos Sci 63:2437–2461CrossRefGoogle Scholar
  49. Tuttle JD, Davis CA (2006) Corridors of warm season precipitation in the Central United States. Mon Weather Rev 134:2297–2317CrossRefGoogle Scholar
  50. Wang SY, Chen TC (2009) The late spring maximum of rainfall over the United States central plains and the role of the low-level jet. J Clim 22:4696–4709CrossRefGoogle Scholar
  51. Wang SY, Chen TC and Taylor SE (2009a) Evaluations of NAM forecasts on midtropospheric perturbation-induced convective storms over the U.S. Northern Plains. Weather Forecast 24:1309–1333. doi:10.1175/2009WAF2222185.1 Google Scholar
  52. Wang SY, Chen TC, Takle ES (2009b) Climatology of summer midtropospheric perturbations in the U.S. Northern Plains: (II) large-scale effect of terrain boundary layer evolution on the genesis. Clim Dyn (in revision) http://cliserv.jql.usu.edu/paper/part-2.pdf
  53. Weisman RA (1990) An observational study of warm season southern Appalachian lee troughs. Part II: thunderstorm genesis zones. Mon Weather Rev 118:2020–2041CrossRefGoogle Scholar
  54. Weisman ML, Klemp JB, Rotunno R (1988) Structure and evolution of numerically simulated squall lines. J Atmos Sci 45:1990–2013CrossRefGoogle Scholar
  55. Weiss SJ, Hart JA, Janish PR (2002) An examination of severe thunderstorm wind report climatology: 1970–1999. In: 21st conference on severe local storms, San Antonio, TX, 14 August 2002Google Scholar
  56. Zhang DL (1992) The formation of a cooling-induced mesovortex in the trailing stratiform region of a midlatitude squall line. Mon Weather Rev 120:2763–2785CrossRefGoogle Scholar
  57. Zishka K, Smith P (1980) The climatology of cyclones and anticyclones over North America and surrounding ocean environs for January and July, 1950–77. Mon Weather Rev 108:387–401CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Shih-Yu Wang
    • 1
    • 3
  • Tsing-Chang Chen
    • 1
  • James CorreiaJr.
    • 2
  1. 1.Department of Geological and Atmospheric SciencesIowa State UniversityAmesUSA
  2. 2.Pacific Northwest National LaboratoryRichlandUSA
  3. 3.Utah Climate CenterUtah State UniversityLoganUSA

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