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ARTHUR H. SMITH JR.

1 36 MONTHLY WEATHER REVIEW Val. 99, No. 9PICTURE OF THE MONTH A Cyclonically Curved Jet Stream ARTHUR H. SMITH, JR.USAF Enviromental Technical Applications Center, Washington, D.C.Large sheets of anticyclonically curved cirrus are this region of sinking air. Thus, cyclonically curvedfrrquently SWII on satellite photopa1)hs and can be cirrus is seen infrequently; and this portion of the jetsssrttcd wit,h the jct stream. This thick cirrns is stroam is difficult to locate on sstellite

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FRANCES C. PARMENTER

December 1969 873UDC 551.576.1 : 551.557.5: 551.507.362.2(084.1)PICTURE OF THE MONTHConvective Clouds Along the Jet Stream FRANCES C. PARMENTERNational Environmental Satellite Center, ESSA, Washington, D.C.The Nimbus I11 satellite, launched by NASA, isproviding meteorologists with an operational infraredview of the weather. Local noon and midnight NimbusDRIR (Direct Readout Infrared) coverage provides theuser with more det.ailed information about the structureof weather systems. In this

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Ernani de Lima Nascimento, Gerhard Held, and Ana Maria Gomes

partially explained by the frequent establishment of a northerly low-level jet (LLJ), east of the Andes, particularly during the warm season ( Marengo et al. 2002 ; Vera et al. 2006 ). This circulation has a twofold impact on midlatitude South America; transporting moisture from the Amazon basin to higher latitudes (e.g., Berbery and Barros 2002 ), and increasing the curvature and length of low-level hodographs ( Doswell 1991 ; Nascimento 2005 ). In addition, it is not uncommon for the LLJ to become

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FRANCES C. PARMENTER

54MONTHLY WEATHER REVIEWVol. 96, No. 1PICTURE OF THE MONTH FRANCES C. PARMENTERNational Environmental Stellite Center, ESSA, Washington, D.C.Distinct sharp-edged cloud patterns, such as the one maxima. A number of studies (Reiter [2], Kadlec 111,appearing in the ESSA 3 photomosaic in figure 1, have Whitney et al. [3]), have established the use of this typefrequently been observed to be associated with jet stream of cloud pattern for positioning jet streams.IrFIQURE l.-ESSA 3, passes 4849

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ARTHUR H. SMITH JR.

areas are easily verified when they occurover data-rich areas and, if similar cloud patterns areidentified over little-traveled, data-sparse regions, theidentification and forecasting of turbulence can mostcertainly be improved.One such example of cloud patterns associated with ahigh risk area occurred on Dec. 28-29, 1970. The jet streamcloud patterns a.ssociated with the turbulent areas can beseen in figure 1. The clouds associated with the sub-tropical jet stream originate in the intertropical

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FRANCES C. PARMENTER

574 MONTHLY WEATHER REVIEW Vol. 96, No. 8PICTURE OF THE MONTHFRANCES C. PARMENTERNational Environmental Satellite Center, ESSA, Washington, D.C.A late spring storm which traversed southeasternC'rtnrtd~. between Jlme 2 and June 4, 1968, brought, rt poolof (.old air into the northenstern United States. An inter-esting l"eatnre of this stdorm IVRS the development of post-frontal t,hunderstorms dong ti line polew-twd and roughlyptdlel to the jet, staream. This line of activity movedeast\vard and

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FRANCES C. PARMENTER

574 MONTHLY WEATHER REVIEW Vol. 96, No. 8PICTURE OF THE MONTHFRANCES C. PARMENTERNational Environmental Satellite Center, ESSA, Washington, D.C.A late spring storm which traversed southeasternC'rtnrtd~. between Jlme 2 and June 4, 1968, brought, rt poolof (.old air into the northenstern United States. An inter-esting l"eatnre of this stdorm IVRS the development of post-frontal t,hunderstorms dong ti line polew-twd and roughlyptdlel to the jet, staream. This line of activity movedeast\vard and

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202MONTHLY WEATHER REVIEW Vol. 92, No. 5PICTURE OF THE MONTHThis TIROST- Ifi chnds curre from the lower left to the picture riyllt-center. The e:lsternmost b:md suKyests frontal clouds,md the center b:ulcl. with man- smtdl transverse elenlrnts,is similtw to :I jet stream pattern. This interpretationappears to be inconsistent with surface data, however.The western thin curred band is not like anything usu:~ll~-seen in TIROS pictures.The cumuliform c,loudiness in the upper left qundr

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RALPH K. ANDERSON

fog fills the entire valley from (E) to (F). Over theocean south of Monterey Bay, low stratus hugs the coast-line, a reflection of the stagnant, anticyclonic flow thatdominated the area for many days. At the time of thepicture, the jet stream was moving southward in ad-vance of a short-wave trough which was approachingWashington. The jet extends northeastward from (G)and crosses the coast near Portland, Oreg. From the coasteastward, it parallels the well-defined, sharp northernedge of the frontal

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ROBE B. CARSON

thoughthe surface front terminates near the northernmost portionof the cloud spiral.The suggestion that the cloud band along the bottom ofthe picture might be associated with a jet was madebecause similar appearing sharp-edged bands have some-times been observed marking the southern edge of thepolar jet.* These bands, when associated with jets, arecomposed of cirrus clouds at least along the least-curvedportion. The jet stream must, of course, depart at somepoint from t~he spiral pattern because, in

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