Tropical Cyclone Report
Tropical Storm Erick
20 - 24 July 2001
Lixion A. Avila
National Hurricane Center
31 July 2001
Erick formed well to the southwest of Mexico and soon moved over
cool waters resulting in weakening.
a. Synoptic History
Erick apparently formed from a poorly-defined tropical wave that
traveled westward across the tropical Atlantic and reached the
eastern North Pacific on 16 July. The thunderstorm activity
associated with the wave increased on the 18th when the
disturbance was centered about 700 n mi south of the southern tip
of Baja California. Thereafter, deep convection gradually developed
around a large cyclonic gyre which accompanied the wave. It was not
until 1800 UTC 20 July that a well-defined center of circulation
formed and satellite intensity estimates supported tropical
depression status. Moving on a general west-northwest track, the
system became a tropical storm and reached maximum winds of 35
knots and 1001 mb minimum pressure 1200 UTC 22 July. It then moved
over relatively cooler waters and weakened as the deep convection
quickly vanished. By 0000 UTC 24 July, it was just a non-convective
and dissipating swirl of low clouds, although some showers
b. Meteorological Statistics
Table 1 gives the best track positions and intensities of Erick
at six-hourly intervals. Figure 1 shows a plot of this track.
Figure 2 and Figure 3
depict the curves of maximum one-minute average
"surface" (10 m above sea-level) wind speed and minimum central
sea-level pressure, respectively, as functions of time. Also
plotted are the observations on which the curves are based. These
consist of Dvorak-technique estimates using satellite imagery by
the Tropical Analysis and Forecast Branch (TAFB), the Satellite
Analysis Branch (SAB), and the U.S. Air Force Weather Agency
(AFWA). Data from several QuikSCAT passes helped to identify the
initial closed low-level circulation associated with the tropical
cyclone, as well as its intensity.
c. Casualty and Damage Statistics
No reports of casualties or damage associated with Erick have
d. Forecast and Warning Critique
Erick was a tropical storm for less than 48 hours. However, the
limited sample indicates that the NCEP Global Model performed
remarkably well and somewhat better than the official forecast. The
official intensity forecasts captured quite well both the
development and the weakening trends of Erick.
Table 1: Table 1. Best track, Tropical Storm Erick, 20-24 July, 2001.
|Lat. (°N)||Lon. (°W)
|20 / 1800||13.9||117.4||1007||30||tropical depression
|21 / 0000||14.3||118.1||1007||30||"
|21 / 0600||14.9||118.8||1007||30||"
|21 / 1200||15.5||119.6||1007||30||"
|21 / 1800||16.2||120.4||1005||35||tropical storm
|22 / 0000||17.0||121.5||1005||35||"
|22 / 0600||17.7||122.3||1005||35||"
|22 / 1200||18.5||123.3||1001||35||"
|22 / 1800||19.2||124.5||1002||35||"
|23 / 0000||19.6||125.6||1002||35||"
|23 / 0600||20.0||126.5||1003||35||"
|23 / 1200||20.4||127.4||1005||30||tropical depression
|23 / 1800||20.8||128.0||1006||30||"
|24 / 0000||21.1||128.6||1008||25||"
|22 / 1200||18.5||123.3||1001||35||minimum pressure
Best track positions for Tropical Storm Erick, 20-24 July 2001.
Best track maximum sustained 1-minute 10 meter wind speed curve for
Tropical Storm Erick, 20-24 July 2001.
Best track minimum central pressure curve for Tropical Storm Erick,
20-24 July 2001.