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S. Allen Macklin, Nicholas A. Bond, and Jeffrey P. Walker

2568 MONTHLY WEATHER REVIEW VOLUME II$Structure of a Low-Level Jet over Lower Cook Inlet, Alaska* S, ALLEN 1VIACILLINPacific Marine Environmental Laboratory, National Oceanic a~uI Atmospheric Administration, Seattle, Washington NICHOLAS A. BONDJoint Institute for the Study of the Atmosphere and Ocean, University of Washington/NOAA, Seattle, Washington JEFFREY

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Dennis A. Keyser and Donald R. Johnson

SEPTEMBER 1984 DENNIS A. KEYSER AND DONALD R. JOHNSON 1709Effects of Diabatic Heating on the Ageostrophic Circulation of an Upper Tropospheric Jet Streak DENNIS A. KEYSERI AND DONALD R. JOHNSON2Department of Meteorology, The University of Wisconsin-Madison, Madison, WI 53706(Manuscript received 4 March 1983, in final form 29 May 1984) ABSTRACT The interaction between the

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D. Ramond, H. Corbin, M. Des̄bois, G. Szejwach, and P. Waldteufel

2164 MONTHLY WEATHER REVIEW VOLUME 109The Dynamics of Polar Jet Streams as Depicted by the METEOSAT W- Channel Radiance Field D. RAMONO AND H. CORmNObservatoire du Puy de D~me, 63000 Clermonl-Ferrand, France M. D~sots ^NO G. SZOWACrlLaboratoire de M~tdorologie Dynamique du CNRS, Ecole Polytechnique, 91128 Palaiseau. France P. WALDTEUFELObservatoire du Puy de D

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Craig R. Ferguson, Shubhi Agrawal, Mark C. Beauharnois, Geng Xia, D. Alex Burrows, and Lance F. Bosart

weather regime (e.g., Ford et al. 2015 ; Song et al. 2016 ). And perhaps more importantly, the societal benefit of weather forecast improvements is not time-constant, but instead maximized during extremes. A more pragmatic assessment of the added value of soil moisture DA would give additional weight to events of opportunity such as Great Plains low-level jets (GPLLJs) when the land’s potential impact on the atmosphere and the potential for extreme weather are both high. GPLLJs are both sensitive to

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Kenneth R. Pomeroy and Thomas R. Parish

1. Introduction During late spring and summer a northerly low-level jet frequently occurs over the Pacific Ocean along the west coast of the United States from Oregon to California. Wind maxima within the jet in excess of 25 m s −1 have been observed ( Zemba and Friehe 1987 ; Beardsley et al. 1987 ; Rogers et al. 1998 ). This coastal jet (CJ) generally parallels the orientation of the coastline. The synoptic situation is controlled by the broad Pacific high situated some 1000 km west of the

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Louis W. Uccellini and Donald R. Johnson

682 MONTHLY WEATHER REVIEW VOLUMEThe Coupling of Upper and Lower Tropospheric Jet Streaks andImplications for the Development of Severe Convective Storms Louis W. UCCELLINItSpace Science and Engineering Center, University of Wisconsin, Madison $$706 DONALD R. JOHNSONSpace Science and Engineering Center and Department of Meteorology, University of Wisconsin, Madison 53706

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Dudley B. Chelton, Michael H. Freilich, and Steven K. Esbensen

. The existence of three low-elevation gaps through the mountains (elevations below 300 m, see Fig. 1 ), in combination with this large difference in SLP across the Central American isthmus, 1 create unique meteorological conditions. The cross-isthmus pressure gradients can generate intense wind jets 2 that blow through all three gaps and into the Pacific over the Gulfs of Tehuantepec, Papagayo, 3 and Panama. Since the Sierra Madre also form a barrier to the Caribbean trade winds at altitudes

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Daniel M. Stechman, Robert M. Rauber, Greg M. McFarquhar, Brian F. Jewett, and David P. Jorgensen

Vortex Experiment (BAMEX; Davis et al. 2004 ) squall line, which moved along a warm front. Their study focused on bands of cyclonic and anticyclonic vertical vorticity in the low levels formed through tilting and stretching of horizontal vorticity, with couplets of enhanced vertical vorticity contributing to the formation of embedded bow echoes. Convective momentum transport within squall lines and the latent heating associated with the convection has the potential to disrupt upper-level jet streams

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Paul J. Neiman, Daniel J. Gottas, and Allen B. White

is an effective method for monitoring and studying the complex spatiotemporal characteristics of gap flow. Neiman et al. (2018) established wind speed and directional shear criteria to detect gap flow jet speed and depth for CRG gap flow using individual hourly averaged wind profiles. In this application, these gap flow metrics were used to develop a real-time, web-based, gap-flow detection product that provides situational awareness to forecasters in the National Oceanic and Atmospheric

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- ..490Vol. 97, No. 7UDC 551.i507.362.2%1.676.1:%1.557.6(73)SATELLITE STUDIES OF CLOUDS AND CLOUD BANDS NEAR THE LOW-LEVEL JET'WILLIAM D. BONNER and FRANK WINNINGHOFFUniversity of California, Lor Angeles, Calif. ABSTRACTTIROS-VI1 and -VIII photographs are used to study synoptic and mesoscale cloud patterns during 6 dayswith strong southerly flow in the Central United States. Cases with nocturnal thunderstorms show a tendency forthunderstorms to occur in the downstream portion of the jet

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