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Preliminary Report
Tropical Storm Dean
28 July-3 August 1995

Lixion A. Avila
National Hurricane Center
14 November 1995

Hurricane Allison
Tropical Storm Barry
Tropical Storm Chantal
Tropical Storm Dean
Hurricane Erin
Tropical Depression Six
Hurricane Felix
Tropical Storm Gabrielle
Hurricane Humberto
Hurricane Iris
Tropical Storm Jerry
Tropical Storm Karen
Hurricane Luis
Tropical Depression Fourteen
Hurricane Marilyn
Hurricane Noel
Hurricane Opal
Tropical Storm Pablo
Hurricane Roxanne
Tropical Storm Sebastien
Hurricane Tanya

[1995 Atlantic Hurricane Season]

a. Synoptic History

Tropical Storm Dean developed from a broad quasi-stationary middle-level trough extending from the northeastern Gulf of Mexico through Florida. On the 27th of July, a weak cyclonic circulation was indicated by buoy reports in the eastern Gulf of Mexico accompanied by surface pressure falls of about 2.5 mb in 24 hours. At that time, satellite images showed that the thunderstorm activity was disorganized but the upper-level outflow was beginning to become established. On the 28th, animation of high resolution visible satellite images clearly showed a low-level cyclonic rotation. Based on that information and on surface reports, it is estimated that Tropical Depression Four formed about 300 n mi southeast of New Orleans at 1800 UTC July 28.

A reconnaissance plane was dispatched to the area and located a circulation center of 1008 mb minimum pressure. The maximum flight-level (1500 ft) wind was 32 knots. The depression moved slowly toward the west to west-northwest around a well-established mid-level high pressure ridge located over the central U.S., with no significant change in strength. The depression was under continuous reconnaissance surveillance and, during the time between the last fix at 1712 UTC 30 July of mission number 5 and the first fix of mission number 6 at 2142 UTC 30 July, the pressure dropped from 1005 mb to 999 mb and the flight-level (1500 ft) winds increased from 40 to 50 knots. Using this data, it is estimated that the depression became Tropical Storm Dean at 1800 UTC 30 July about 60 n mi from the upper Texas coast. The center of Dean crossed the coast near Freeport, Texas a few hours later. Tropical cyclones have occasionally intensified just prior to making landfall in that area.

Dean weakened to tropical depression status shortly after landfall and continued on a northwestward track through Texas. The depression became nearly stationary for about 24 to 36 hours over the northwest portion of the state producing heavy rainfall. It dissipated at 0000 UTC August 3 as it merged with a frontal zone.

Dean's track is shown in Fig. 1 (43K GIF). Table 1 is a listing, at six-hour intervals, of the "best-track" position, estimated minimum central pressure and maximum 1-minute surface wind speed.

b. Meteorological Statistics

The best track pressure and wind curves as a function of time shown in Figures 2 and 3 (41K GIF) are based on reconnaissance aircraft data, satellite intensity estimates from the National Hurricane Center, the Satellite Analysis Branch (SAB) and the Air Force Global Weather Central (AFGWC). There were no reports of tropical storm force winds (1-min sustained) from surface land stations. The highest observed wind was a 44-knot gust reported by Galveston Scholes Field at 2115 UTC 30 July. The storm tide rose and covered the road along highway 82 between Johnsons Bayou and Holly Beach in Cameron Parish, Louisiana. Minor storm surge flooding of highway 87 occurred on the 30th.

There were two tornadoes associated with Dean. The first occurred in Galveston County at High Island around 2330 UTC and the second touched down just southeast of Anahua near 0300 UTC. Table 2 includes some of the most significant rainfall totals received so far associated with Dean.

c. Casualty and Damage Statistics

There were no reports of injuries or deaths associated with Dean. However, rainfall was a problem causing near $500,000 in damage. Evacuation of 20 families was necessary in Chambers County due to rainfall flooding. Data were provided by local weather service forecast offices.

d. Forecast and Warning Critique

Since the tropical cyclone was forecast to reach tropical storm strength before landfall, a tropical storm warning was issued for the Gulf of Mexico coast from Intracoastal City, Louisiana to Corpus Christi, Texas at 0300 UTC 30 July. The warning was issued 23 hours before landfall and discontinued at 0300 UTC 31 July.

Dean was a tropical storm for less than 12 hours, so there were practically no cases from which to verify official forecasts.

Table 1. Preliminary best track, Tropical Storm Dean, 28 July - 3 August, 1995
Position Pressure
Wind Speed
Lat. (°N)Lon. (°W)
28/180026.286.6100925 Tropical Depression
29/000026.187.3100830" "
060026.287.9100830" "
120026.388.3100830" "
180026.589.4100730" "
30/000026.990.6100730" "
060027.691.7100630" "
120028.193.0100530" "
180028.694.0100335 Tropical Storm
31/000029.095.099940" "
060029.595.5100230 Tropical Depression
120030.096.0100325" "
180030.596.5100320" "
1/000031.597.0100420" "
060032.097.5100420" "
120033.098.5100420" "
180033.098.5100420" "
2/000033.098.5100420" "
060033.098.5100420" "
120033.098.5100420" "
180033.098.5100420" "
3/0000 dissipated
31/000029.095.099940 Minimum
31/020029.295.399940 Landfall near
Freeport Texas

Table 2. Selected rainfall accumulations (inches) associated with Dean.
LocationTotalLocationTotal LocationTotalLocationTotal
Monroe City16.78Vernon14.00 Anahuac9.80Dayton8.00
New Waverly6.65Hunstville5.00 Tarkington Praire5.00Cleveland4.25
Shepherd3.25Wolf Creek Park2.80 Point Blank2.90Caney Creek2.60
New Caney2.44Jasper2.50     
Lake Charles Airport0.77       

Brian Maher
Jack Beven

Last updated January 2, 1999