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James L. Franklin
,
Lixion A. Avila
,
Jack L. Beven
,
Miles B. Lawrence
,
Richard J. Pasch
, and
Stacy R. Stewart

maintained hurricane force winds until around 1200 UTC on 23 August. The weakening storm turned toward the west and moved along the northern coast of Hispaniola. Although the mountainous landmass of that island may have played some role in the weakening by restricting inflow from the south and disrupting the southern part of the cyclone's circulation, it appears that vertical shear was primarily responsible. Around midday on 23 August, a distinct low-cloud circulation center was evident just to the north

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Emil B. Gunther

.During the 1975 season 63% of the hurricanes had winds100 kt or greater and the highest sustained speed was125 kt. The duration of hurricane force winds in 1977totaled 128 h compared with 498 h in 1975. Storm windsin 1977 totaled 343 h and those in 1976 816 h. The 1977 tropical cyclone season was exceptional inthat one of the hurricanes (Doreen) became the second'such storm within a year to bring heavy rains to Southern California. The previous hurricane (Kathleen, 1976)was the first tropical cyclone

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James L. Franklin
,
Lixion A. Avila
,
John L. Beven II
,
Miles B. Lawrence
,
Richard J. Pasch
, and
Stacy R. Stewart

is of great help in assessing system location and organization. The SeaWinds scatterometer onboard the National Aeronautics and Space Administration's Quick Scatterometer (QuikSCAT) satellite ( Tsai et al. 2000 ) provides surface winds over large oceanic swaths. While the QuikSCAT does not have the horizontal resolution to determine a cyclone's maximum winds, it can be used to estimate the extent of tropical storm force winds, and is often helpful in determining whether an incipient tropical

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Stacy R. Stewart
and
John P. Cangialosi

situ observations. For systems posing a threat to land, direct measurements from reconnaissance aircraft are often available. However, since all of the hurricanes that formed remained well away from any landmasses in 2010, the 53rd Weather Reconnaissance Squadron of the U.S. Air Force Reserve Command (AFRC) did not fly any reconnaissance missions into eastern North Pacific tropical cyclones this year. Land-based radars from the meteorological service of Mexico were also useful for monitoring

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Daniel P. Brown
,
John L. Beven
,
James L. Franklin
, and
Eric S. Blake

became sufficiently well defined to be considered a tropical storm around 0000 UTC 31 May, when it was centered about 45 n mi east of Belize City. Arthur moved slowly west-northwestward and reached a peak intensity of 40 kt 6 h later. The storm maintained this intensity through landfall, which occurred around 0900 UTC 31 May in northeastern Belize, about midway between Belize City and Chetumal, Mexico. Even after landfall, the cyclone continued to produce tropical storm–force winds in bands to the

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GORDON E. DUNN

'edpressure was 974 mb. The hurricane struck the CanadianMaritime Provinces in the vicinity of NorthumberlandStraits. Associated wind and barometric data as thestorm moved inland are lacking, but the press report'ed33 deaths, mostly lobster fishermen, and considerableproperty damage. Notices of this severe storm had beencarried in the NSS bulletins.Cindy, July 5-1W.-The fourth tropical cyclone of theseason, Cindy, barely reached hurricane force beforeit crossed the coastline north of Charleston, S.C., onJuly

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John L. Beven II
and
James L. Franklin

sustained winds at 10 m) are derived from satellites; these include Dvorak (1984) intensity estimates, cloud-drift winds, and ocean surface scatterometer data (e.g., Tsai et al. 2000 ). Other sources of data include infrequent surface, upper-air, and radar observations. There were no reconnaissance flights into eastern North Pacific tropical cyclones in 1999. Hurricane Greg, which crossed the southern tip of Baja California, Mexico, as a tropical storm on 7 September, was the only storm to make

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Neil L. Frank

motion in the upper troposphere ismuch better defined than on visible pictures, and thisoffers the possibility of computing such parameters asupper-level outflow. A second technological achievement was the operafional testing of a sophisticated new airborne recordingsystem (AWRS) developed by the Air Force. Thissystem was installed on one of the C-130 aircraft operated by the 53rd Weather Reconnaissance Squadronand a ntmaber of successful missions were flown intonamed storms, including one

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Miles B. Lawrence

attributedto Cosine from inland flash flooding.1. General Seventeen tropical storms were tracked in the easternPacific Ocean during 1989 and nine of these reachedhurricane force. In addition, seven tropical depressionswere tracked which did not develop into tropicalstorms. The 17 named tropical storms and hurricanes,along with their dates, highest sustained wind, minimum sea-level pressure, U.S. damage, and deaths arelisted in Table 1. The season's first tropical cyclone was TropicalStorm Adolph

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Miles B. Lawrence
and
Edward N. Rappaport

personson board were rescued. Although the cyclone center remained well offshoreof mainland Mexico, the large size of the circulationprompted the Government of Mexico to issue a tropicalstorm warning for the extreme southern tip of BajaCalifornia south of La Paz on 5 July. No tropicalstorm-force wind reports were received from the peninsula but several ships just off the extreme southerntip of the peninsula did report such winds. The cloud cover associated with Darby forced thelanding of the NASA

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