Josephine was a short-lived, high latitude tropical storm well out at sea.
Josephine was of non-tropical origin. Surface data indicated that a weak low pressure system formed along a dissipating, nearly stationary frontal zone about 750 n mi east of Bermuda on 16 September. Over the next day, as the low moved slowly westward, a small area of deep convection formed near the low-level circulation center and the system's cloud pattern changed from one that resembled a non-tropical cyclone to that of a tropical cyclone. It is estimated that the system became a tropical depression around 1200 UTC 17 September, while centered about 620 n mi east of Bermuda. The tropical cyclone moved slowly north-northwestward to northward for about a day. Deep convection associated with the system was intermittent and at times the low-level center became exposed. However, the cyclone strengthened slightly and is estimated to have become a tropical storm by 0600 UTC 18 September. Soon thereafter, Josephine accelerated northeastward in the flow ahead of a deep-layer mid-latitude trough. The system lost its tropical characteristics around 1200 UTC 19 September, at which time a ship report indicated that the cyclone had strengthened into an storm with winds near 50 kt well removed from the center. Soon thereafter, the storm merged with a larger extratropical low and frontal system. The "best track" chart of Josephine's path is displayed in Figure 1, with the wind and pressure histories shown in Figure 2 and Figure 3, respectively. The best track positions and intensities are listed in Table 1.
Observations in Josephine (Figure 2 and Figure 3) include satellite-based Dvorak technique intensity estimates from the Tropical Analysis and Forecast Branch (TAFB), the Satellite Analysis Branch (SAB) and the U. S. Air Force Weather Agency (AFWA). Additionally, there was a report of 37 kt winds from a ship (see Table 2) as well as QuikSCAT and SSM/I winds near 35 kt around 0600 UTC 18 September. When Josephine became extratropical at 1200 UTC 19 September, a ship with call sign C6LV3 reported 50 kt winds about 76 n mi southeast of the center.
There were no reports of damages or casualties associated with Josephine.
Josephine was a tropical storm for only about a day, so there are no meaningful forecast statistics. In general, the official forecasts correctly anticipated that the cyclone would accelerate northeastward, and that it would not strengthen significantly as a tropical cyclone. Watches or warnings were not required for Josephine.
|17 / 1200||32.7||52.4||1016||30||tropical depression|
|17 / 1800||33.2||52.7||1015||30||"|
|18 / 0000||33.7||52.7||1014||30||"|
|18 / 0600||34.7||52.7||1009||35||tropical storm|
|18 / 1200||35.5||52.0||1009||35||"|
|18 / 1800||36.6||50.5||1009||35||"|
|19 / 0000||38.0||48.8||1009||35||"|
|19 / 0600||39.5||46.7||1009||35||"|
|19 / 1200||41.5||43.3||1004||50||extratropical|
|19 / 1800||merged with larger extratropical cyclone|
|19 / 0600||39.5||46.7||1009||35||minimum pressure|
|Ship Name or Call Sign||Date/Time (UTC)||Lat.|
|Wind dir/speed (deg/kt)||Pressure (mb)|
|PDKK||18 / 0300||34.1||52.0||190 / 37||1010.8|
Figure 1: Best track positions for Tropical Storm Josephine, 17-19 September 2002. Minimum pressure (mb) at arrowhead.
Figure 2: Best track maximum sustained surface wind speed curve and satellite-derived intensity estimates for Tropical Storm Josephine, 17-19 September 2002.
Figure 3: Best track minimum central pressure curve and satellite-derived pressure estimates for Tropical Storm Josephine, 17-19 September 2002.
About Alternates - E-Mail Advisories - RSS Feeds
Latest Advisory - Past Advisories - About Advisories
Latest Products - About Marine Products
Tools & Data
Satellite Imagery - US Weather Radar - Aircraft Recon - Local Data Archive - Forecast Verification - Deadliest/Costliest/Most Intense
Learn About Hurricanes
Storm Names Wind Scale - Prepare - Climatology - NHC Glossary - NHC Acronyms - Frequently Asked Questions - AOML Hurricane-Research Division
About NHC - Mission/Vision - Other NCEP Centers - NHC Staff - Visitor Information - NHC Library
National Weather Service
National Centers for Environmental Prediction
National Hurricane Center
11691 SW 17th Street
Miami, Florida, 33165-2149 USA
Page last modified: Wednesday, 14-Feb-2007 18:42:20 UTC