Tropical Cyclone Report
Tropical Storm Barbara
20 - 26 June 2001
National Hurricane Center
7 August 2001
a. Synoptic history
The origin of Barbara can be traced to a tropical wave that
moved westward off the coast of Africa on 1 June. The wave moved
into the Caribbean Sea on 7 June, and into the eastern Pacific on
10-11 June with little sign of development. The wave continued
westward to near 120W by 18 June, where it first became
organized into an area of disturbed weather with a broad
circulation. Further slow organization over the next two days
resulted in the formation of Tropical Depression Two-E at 0000 UTC
20 June, about 1150 n mi southwest of Cabo San Lucas, Mexico
(Figure 1 and Table 1).
As the cyclone formed, it began a
west-northwestward motion that would persist through its
The depression intensified into Tropical Storm Barbara later on
20 June, then reached a peak intensity of 50 kt on the
21st. Thereafter, increasing southwesterly vertical
shear caused weakening, and Barbara became a depression as it
crossed 140W into the central Pacific hurricane basin.
The depression passed north of the Hawaiian Islands on 25-26 June,
then weakened to an easterly wave to the northwest of Kauai on 26
June. The remnants of Barbara continued west-northwestward until
being absorbed by a frontal zone near the International Dateline on
b. Meteorological statistics
The "best track" of Barbara is given in Table 1 and
Figure 2 and Figure 3 show the best track
maximum sustained (1 min
average) surface (10 m elevation) wind speed and minimum central
pressure, as well as the associated observations. These include
Dvorak technique position and intensity estimates from the Tropical
Analysis and Forecast Branch (TAFB), the NOAA/NESDIS Satellite
Analysis Branch (SAB), and the Air Force Weather Agency (AFWA).
Data west of 140W was provided by the Central Pacific
Hurricane Center in Honolulu, HI.
The only observation of tropical storm-force winds was from the
ship V2FA2 (name unavailable) which reported 47 kt
winds 105 n mi northwest of the center at 0000 UTC 22 June. While
this report is close to the best track intensity at the time, the
distance from the center makes the wind speed appear inconsistent
c. Casualty and damage statistics
No reports of damage or casualties were received by
the National Hurricane Center (NHC).
d. Forecast and warning critique
Barbara was a tropical storm for only 42 h, so there
are only 6, 4, and 2 forecasts to verify at 12, 24, and 36 h
respectively. The average track forecast errors for Barbara at
those times were 15, 30 and 28 n mi. These errors are well below
the NHC ten-year average. Average intensity forecast errors were
2.5, 2.5, and 5 kt for the 12, 24, and 36 h forecasts, which are
also below the long term averages.
Watches and warnings were neither issued nor needed
Table 1: Table 1. Best track, Tropical Storm Barbara,
20-26 June 2001. Data west of 140W longitude
provided by the Central Pacific Hurricane Center in Honolulu,
|Lat. (°N)||Lon. (°W)
|20 / 0000||11.9||126.5||1008||30||tropical depression
|20 / 0600||12.3||127.8||1008||30||"
|20 / 1200||12.7||129.1||1007||30||"
|20 / 1800||13.2||130.4||1005||35||tropical storm
|21 / 0000||13.7||131.6||1003||40||"
|21 / 0600||14.2||132.8||1000||45||"
|21 / 1200||14.7||134.1||997||50||"
|21 / 1800||15.1||135.3||999||45||"
|22 / 0000||15.6||136.5||1001||45||"
|22 / 0600||16.1||137.8||1003||40||"
|22 / 1200||16.5||139.0||1005||35||"
|22 / 1800||16.8||140.1||1006||30||tropical depression
|23 / 0000||17.3||141.2||1006||30||"
|23 / 0600||17.7||142.6||1007||30||"
|23 / 1200||18.0||143.7||1009||25||"
|23 / 1800||18.2||145.0||1011||25||"
|24 / 0000||18.8||146.3||1011||25||"
|24 / 0600||19.3||147.6||1011||25||"
|24 / 1200||19.8||148.9||1011||25||"
|24 / 1800||20.3||150.3||1012||25||"
|25 / 0000||20.7||151.8||1012||25||"
|25 / 0600||21.1||153.2||1013||25||"
|25 / 1200||21.6||155.0||1014||25||"
|25 / 1800||22.2||156.9||1014||25||"
|26 / 0000||22.6||158.9||1014||25||"
|26 / 0600||23.1||161.0||1014||25||"
|26 / 1200||
|21 / 1200||14.7||134.1||997||50||minimum pressure
Best track of Tropical Storm Barbara, 20-26 June 2001. Data west of
140W longitude provided by the Central
Pacific Hurricane Center, Honolulu, HI.
Best track maximum sustained 1-minute 10 meter wind speed curve for
Tropical Storm Barbara.
Best track minimum central pressure curve for Tropical Storm Barbara 20-26