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Preliminary Report
Tropical Storm Dalila
24 July-2 August 1995

Edward N. Rappaport
National Hurricane Center
4 December 1995

Tropical Depression One-E
Hurricane Adolph
Hurricane Barbara
Hurricane Cosme
Tropical Storm Dalila
Tropical Storm Erick
Hurricane Flossie
Tropical Storm Gil
Hurricane Henriette
Hurricane Ismael
Hurricane Juliette

[1995 East Pacific Hurricane Season]

a. Synoptic History

The origin of Tropical Storm Dalila* can be traced to a tropical wave that moved westward from Africa to the tropical Atlantic Ocean on 11 July. The wave soon developed two areas of thunderstorm activity. One of these moved northwestward and showed signs of becoming a tropical depression before degenerating over the eastern Atlantic. The other, farther south, moved westward across the Atlantic Ocean and then the Caribbean Sea and Central America from the 11th through the 21st.

Thunderstorms associated with the wave became more concentrated several hundred miles to the southwest of the Gulf of Tehuantepec on the 23rd. Based on satellite pictures and surface analyses it is estimated that this system became a tropical depression at 1200 UTC the next day (Table 1 and Fig. 1 [40K GIF]). The cyclone was then in an environment of weak steering currents and, over the course of the following three days, moved slowly first toward the north-northeast and then toward the northwest. The low-level circulation was not strongly convergent, with satellite pictures and surface data indicating a fairly broad area of west-southwesterly winds to the south and southeast of the depression. Easterly shear displaced the deepest convection up to 60 n mi to the west of the low-level cloud center. Only slight strengthening occurred and although the cyclone became a tropical storm on the 25th, it still had only 35 knot winds late on the 27th.

A deep-layer anticyclone then developed to the north of the storm. Dalila accelerated to 12 knots, initially heading toward the west-northwest and then the northwest. The shear decreased and the storm reached its peak intensity of 55 knots on the 28th. Dalila weakened upon moving over cooler water southwest of the Baja California peninsula. It stopped generating deep convection late on the 31st and dissipated on 2 August.

b. Meteorological Statistics

Figures 2 (24K GIF) and 3 (25K GIF) show "best track" curves of estimated minimum central pressure and maximum one-minute wind speed versus time, respectively, and the data upon which they were based. The Air Force Global Weather Center (AFGWC), the NHC Tropical Analysis and Forecast Branch (TAFB; TSAF in figures), and the NESDIS Synoptic Analysis Branch (SAB) supplied the Dvorak technique classifications.

There were no surface reports of tropical storm force winds related to Dalila.

A measure of the uncertainty of Dalila's early intensity estimates is given by comparing the 0000 UTC 27 July satellite classifications from the AFGWC--which stated that the system had dissipated--and the analyses of the TAFB and SAB--which had Dalila as a tropical storm.

c. Casualty and Damage Statistics

There were no casualties or damages reported in association with Dalila.

d. Forecast and Warning Critique

The magnitudes of official track forecast errors were, on average, comparable to the past averages and smaller than most of the objective guidance errors for this storm. Intensity forecast errors were also similar in size to past averages.

Watches and warnings were neither issued nor necessary.

 * The name "Dalilia" (Spanish for Delilah) was used in 1981 and 1988 and changed, perhaps inadvertently, to Dalila in operational documents prior to the 1995 season.

Table 1. Preliminary best track, Tropical Storm Dalila, 24 July-2 August 1995.
Position Pressure
Wind Speed
Lat. (°N)Lon. (°W)
24/120013.1108.3100725 Tropical Depression
180013.3108.2100625" "
25/000013.5108.1100530" "
060013.8108.0100435 Tropical Storm
120014.0108.0100335" "
180014.3108.1100335" "
26/000014.6108.3100235" "
060014.9108.6100235" "
120015.0108.8100235" "
180015.1109.0100235" "
27/000015.2109.2100235" "
060015.4109.5100235" "
120015.5110.1100135" "
180015.6111.3100135" "
28/000015.7112.5100040" "
060015.8113.699945" "
120016.0114.799750" "
180016.2115.999555" "
29/000016.4117.099455" "
060016.7118.099650" "
120017.0118.999850" "
180017.3119.899945" "
30/000017.7120.6100045" "
060018.1121.2100145" "
120018.7121.9100240" "
180019.2122.3100340" "
31/000019.5122.5100440" "
060019.6122.7100535" "
120019.7122.9100535" "
180019.8123.2100635" "
1/000020.0123.5100630 Tropical Depression
060020.3123.9100630" "
120020.7124.6100730" "
180021.1125.4100725" "
2/000021.2126.3100725" "
29/000016.4117.099455 Minimum Pressure

Brian Maher
Jack Beven

Last updated January 2, 1999