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A. J. HENRY

APRIL, 1919. MONTHLY WEATHER REVIEW. 255THE WEATHER OF THE MONTH.WEATHER OF NORTH AMERICA AND ADJACENT OCEANS.GENERAL CONDITIONS.A. J. HENRY, Meteorologist.The distribution of mean pressure in the Northern Hemisphere for April indicates the beginning of the dis- solution of the great continental hi lis antl the buildingNorth Atlantic and the Aleutian LOW of the North Pacific, respectively, are still in evidence, although the former now estends southwestward almost to the Canadian Maritime

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H. C. FRANKENFIELD

JELY, 1920. MONTHLY WEATHER R.EVIEW.WEATHER OF THE MONTH.WEATHER OF NORTH AMERICA AND ADJACENT OCEANS.421GENERAL PRESSURE CONDITIONS.By H. C . FRANKENFIELD, 8uperyieii:g Forecaster.[\Vn.shin:ton. D. C., Auc. 2.1, 1920.1North, PnciJic Occaii..-At Midway Island there were sev- eral slight depressions, but, as a whole, tlie pressure arer- aged somewhat above the normal. At Honolulu pressure was generallv lorn until July 30, and moderately high thereafter. The lowest pressdre (29 .S4 inches), occ

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H. C. FRANKENFIELD

JANUABY, 19u). MONTHLY WEATHER REVIEW. 46WEATHER OF THE MONTH.WEATHER OF NORTH AMERICA AND ADJACENT OCEANS.QENERAL CONDITIONS.By H. C. FRANKENFIELD, Supervising Forecaster.Midway I8hllds a.nd Hon,olulu.-The former showed hi pressures for the season in the first decade aiid b P ow normal pressures thereafter, while Honolulu was continuously low the entire month, the markedly low readin of 29.64 inches being re orted on the 17th. Ab%x.-Pressure was low luring the fmt week of the month and

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A. J. HENRY

MAY, 1919. MONTHLY WEATHER REVIEW. 343WEATHER OF THE MONTH.WEATHER OF NORTH AMERICA AND ADJACENT OCEANS.GENERAL CONDITIONS.By A. J. HENRY, Meteorologist.The annual reversal in normal pressure in the Northern Hemisphere is almost accomplished by the close of May. The great Asiatic high of winter has now disa peared and the normal pressure is highest over the ltlantic southwest of the Azores. Normal pressure is also high over the Pacific northeast of the Hawaiian group although the principal high

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A. J. HENRY

OarOaEa, 1919. MONTHLY WEATHER REVIEW.WEATHER OF THE MONTHWEATHER OF NORTH AMERICA AND ADJACENT OCEANS.GENERAL CONDITIONS.By A. J. HENRY.Pressure in the Northern Hemisphere in October is highest over east-central Asia with the crest of tlie high in Siberia: it is lowest in high latitudes with minima in the neiuliborhood of Iceland and the Aleut.ians. The belt of hgh pressure that encircles the Northern Hemis- phere in winter begins to assume definite Iorm in October.NORTH PACIFIC OCEAN.By F. G

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Linda M. Whittaker and Lyle H. Horn

2312 MONTHLY WEATHER REVIEW VOLUME I09Geographical and Seasonal Distribution of North American Cyclogenesis, 1958-1977 LINDA M. WHITTAKER AND LYLE H. HORNDepartment of Meteorology, University of Wisconsin, Madison 55?06(Manuscript received 27 March 1981, in final form 17 June 1981)ABSTRACT The geographical and seasonal distributions of cyclogenesis are studied for the North American sectorfor the

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A. J. HENRY

JUNE, 1919. MONTHLY WEATHER REVIEW.WEATHER OF THE MONTH.WEATHER OF NORTH AMERICA AND ADJACENT OCEANS.NORTH AMERICA.Iiy A. J . HENIZ~.Judging by concli Lions ns oi)scrvoll in tlic Unit.otl States ant1 Chnndu the prin?nr57 r.irculn t8ion of t,he ntinos- phore was rrtt~ler itinctive ttiilt rvit.Iiuiit dist.inct,ive chair-ncterist irs. The seconilary circulatkm W:LS also werik, there being n decrtleil nhsence of ilie ilc\~elopii~-eiit~ (sfserer0 locnl storws, twiiedoes, and int,en:;c t1iuiiclc

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Waltraud A. R. Brinkmann

JUNE 1981 WALTRAUD A. R. BRINKMANN 1305Sea Level Pressure Patterns over Eastern North America, 1899-1976 WALTRAUD A. R. BRINKMANNDepartment of Geography, University of Wisconsin, Madison 53706(Manuscript received 30 July 1980, in final form 21 January 1981) - ABSTRACT Eigenvector analysis was carried out on monthly mean sea level pressure over eastern North America forthe

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A. J. HENRY

MARCH, 1919. MONTHLY WEATHER REVIEW. 183WEATHER OF NORTH AMERICA AND ADJACENT OCEANS.GENERAL CONDITIONS.By A. J. HENRY, Meteorologist.The distribution of normal pressure over the Nort6ern Hemisphere for March differs but slightly from that of February except that thcre is a rather pronounced fall over the great Continental Highs mounting to as much as 0.20 inch in Siberia and about half that much on the North American Continent. Normal pressure, February to March, increases in the polar re 'ons

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A. J. HENRY

500 MONTHLY WEATHER REVIEW. JULY, 1919WEATHER OF THE MONTH.WEATHER OF NORTH AMERICA AND ADJACENT OCEANS.GENERAL CONDITIONS.By A . J. HENRY, Meteoro1ogk.t.The drought of the previous months in iiorthwestcrn United States has continued; on the southern boundaryrains have fden. and overa sbendy drift of southerly winds over the Carolinas andGeorgia. The oc.cumence of suc.h pressure distribution is seemillgly fort,uitous; in this case the winds were most,1y froni the oceaii and b,avy and continuous

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