The rear-inflow jet is a component of bow echoes in a mesoscale convective system that aids in creating a stronger cold pool and downdraft. The jet forms as a response to a convective circulation having upshear tilt and horizontal pressure gradients. The cold pool that comes from the outflow of a storm forms an area of high pressure at the surface. In response to the surface high and warmer temperatures aloft due to convection, a mid-level mesolow forms behind the leading edge of the storm.
Conceptual airflow in a squall line with the Rear-inflow jet shown
With a mid-level area of low pressure, air is drawn in under the trailing stratiform region of precipitation. As air is drawn in on the rear side of the storm, it begins to descend as it approaches the front line of the cells. Before reaching the leading edge, the jet descends to the surface as a strong downdraft, creating straight-line winds.[1]
Any mature mesoscale convective system is capable of developing its own rear-inflow jet, but questions remain as to what influences the strength of the jet. While the diabatic effects of sublimation, melting and evaporation play a role in influencing jet strength, these effects do not account for cases with strong rear-inflow jets. However, the diabatic effects are responsible for the jet subsiding behind the leading edge of the MCS.[2][3] The sinking of the jet first starts when the mid level inflow goes under the trailing stratiform cloud before descending to the melting layer.[4]
There are other factors that contribute to the strength of any rear inflow jet. The strength of a rear inflow jet can be greatly increased with induced vortices at the end of the line, called "line-end vortices" or "book-end vortices." These vortices at either end of the line will help reinforce the rear inflow towards the center of the line. The other factor that can help strengthen the jet is an environment in which the large scale flow is feeding/forcing mid-level air into the rear end of the storm.[5]
See alsoedit
Rear-inflow notch caused by the sinking of the jet behind a bow echo line
^Houze, Robert A. Jr. (31 December 2004). "Mesoscale convective systems" (PDF). Reviews of Geophysics. 42 (4): RG4003. Bibcode:2004RvGeo..42.4003H. doi:10.1029/2004RG000150. S2CID 53409251. Retrieved 10 July 2012.[permanent dead link]
^Chong, Michel; Amayenc, Paul; Scialom, Georges; Testud, Jacques (1 March 1987). "A Tropical Squall Line Observed during the COPT 81 Experiment in West Africa. Part 1: Kinematic Structure Inferred from Dual-Doppler Radar Data". Monthly Weather Review. 115 (3): 670–694. Bibcode:1987MWRv..115..670C. doi:10.1175/1520-0493(1987)115<0670:ATSLOD>2.0.CO;2.
^Klimowski, Brian A. (1 May 1994). "Initiation and Development of Rear Inflow within the 28-29 June 1989 North Dakota Mesoconvective System". Monthly Weather Review. 122 (5): 765–779. Bibcode:1994MWRv..122..765K. doi:10.1175/1520-0493(1994)122<0765:IADORI>2.0.CO;2.
^Braun, Scott A.; Houze, Robert A. (1 April 1997). "The Evolution of the 10–11 June 1985 PRE-STORM Squall Line: Initiation, Development of Rear Inflow, and Dissipation". Monthly Weather Review. 125 (4): 478–504. Bibcode:1997MWRv..125..478B. doi:10.1175/1520-0493(1997)125<0478:TEOTJP>2.0.CO;2.
^Skamarock, William C.; Weisman, Morris L.; Klemp, Joseph B. (1 September 1994). "Three-Dimensional Evolution of Simulated Long-Lived Squall Lines". Journal of the Atmospheric Sciences. 51 (17): 2563–2584. Bibcode:1994JAtS...51.2563S. doi:10.1175/1520-0469(1994)051<2563:TDEOSL>2.0.CO;2.
Further readingedit
Jorgensen, Murphy and Wakimoto. "Rear Inflow Evolution in a Non-Severe Bow Echo Observed by Airborne Doppler Radar During Bamex."
Houze and Smull. "Rear Inflow in Squall Lines with Trailing Stratiform Precipitation" American Meteorological Society, 1987.
Harder, Jason. "Enhancement of the Downdraft" University of Wisconsin-Madison, 1998.
May 08, 2024
rear, inflow, rear, inflow, component, echoes, mesoscale, convective, system, that, aids, creating, stronger, cold, pool, downdraft, forms, response, convective, circulation, having, upshear, tilt, horizontal, pressure, gradients, cold, pool, that, comes, from. The rear inflow jet is a component of bow echoes in a mesoscale convective system that aids in creating a stronger cold pool and downdraft The jet forms as a response to a convective circulation having upshear tilt and horizontal pressure gradients The cold pool that comes from the outflow of a storm forms an area of high pressure at the surface In response to the surface high and warmer temperatures aloft due to convection a mid level mesolow forms behind the leading edge of the storm Conceptual airflow in a squall line with the Rear inflow jet shown With a mid level area of low pressure air is drawn in under the trailing stratiform region of precipitation As air is drawn in on the rear side of the storm it begins to descend as it approaches the front line of the cells Before reaching the leading edge the jet descends to the surface as a strong downdraft creating straight line winds 1 Any mature mesoscale convective system is capable of developing its own rear inflow jet but questions remain as to what influences the strength of the jet While the diabatic effects of sublimation melting and evaporation play a role in influencing jet strength these effects do not account for cases with strong rear inflow jets However the diabatic effects are responsible for the jet subsiding behind the leading edge of the MCS 2 3 The sinking of the jet first starts when the mid level inflow goes under the trailing stratiform cloud before descending to the melting layer 4 There are other factors that contribute to the strength of any rear inflow jet The strength of a rear inflow jet can be greatly increased with induced vortices at the end of the line called line end vortices or book end vortices These vortices at either end of the line will help reinforce the rear inflow towards the center of the line The other factor that can help strengthen the jet is an environment in which the large scale flow is feeding forcing mid level air into the rear end of the storm 5 See also edit nbsp Rear inflow notch caused by the sinking of the jet behind a bow echo line Convective storm detection Derecho Line echo wave pattern MesovortexReferences edit Houze Robert A Jr 31 December 2004 Mesoscale convective systems PDF Reviews of Geophysics 42 4 RG4003 Bibcode 2004RvGeo 42 4003H doi 10 1029 2004RG000150 S2CID 53409251 Retrieved 10 July 2012 permanent dead link Chong Michel Amayenc Paul Scialom Georges Testud Jacques 1 March 1987 A Tropical Squall Line Observed during the COPT 81 Experiment in West Africa Part 1 Kinematic Structure Inferred from Dual Doppler Radar Data Monthly Weather Review 115 3 670 694 Bibcode 1987MWRv 115 670C doi 10 1175 1520 0493 1987 115 lt 0670 ATSLOD gt 2 0 CO 2 Klimowski Brian A 1 May 1994 Initiation and Development of Rear Inflow within the 28 29 June 1989 North Dakota Mesoconvective System Monthly Weather Review 122 5 765 779 Bibcode 1994MWRv 122 765K doi 10 1175 1520 0493 1994 122 lt 0765 IADORI gt 2 0 CO 2 Braun Scott A Houze Robert A 1 April 1997 The Evolution of the 10 11 June 1985 PRE STORM Squall Line Initiation Development of Rear Inflow and Dissipation Monthly Weather Review 125 4 478 504 Bibcode 1997MWRv 125 478B doi 10 1175 1520 0493 1997 125 lt 0478 TEOTJP gt 2 0 CO 2 Skamarock William C Weisman Morris L Klemp Joseph B 1 September 1994 Three Dimensional Evolution of Simulated Long Lived Squall Lines Journal of the Atmospheric Sciences 51 17 2563 2584 Bibcode 1994JAtS 51 2563S doi 10 1175 1520 0469 1994 051 lt 2563 TDEOSL gt 2 0 CO 2 Further reading editJorgensen Murphy and Wakimoto Rear Inflow Evolution in a Non Severe Bow Echo Observed by Airborne Doppler Radar During Bamex Houze and Smull Rear Inflow in Squall Lines with Trailing Stratiform Precipitation American Meteorological Society 1987 Harder Jason Enhancement of the Downdraft University of Wisconsin Madison 1998 Retrieved from https en wikipedia org w index php title Rear inflow jet amp oldid 1170048077, wikipedia, wiki, book, books, library,
