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HOME > Climate & Weather Linkage > Storm Track Monitoring
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Storm tracks and cyclogenesis/cyclolysis locations for the past 10, 30, and 90 days.
Tracks are based on an algorithm developed at the Climate Diagnostics Center (CDC) [Serreze (1995), and Serreze et al. (1997)].
Storm tracks are identified by locating grid points in which the sea level pressure (SLP) is less than its surrounding grid points.
The threshold used here is 1 mb.The storms are tracked by analyzing the position of systems between time steps and applying a maximum distance threshold between candidate pairings (800 km).
The intensity of the cyclone is given by the color of the line segment with storms of higher pressure indicated by black and storms with lower pressure indicated in red.
The images show storm tracks and total precipitation (mm), mean anomalous 925 mb wind vectors (m/s), and mean significant wave heights (m) (from the Ocean Prediction Center) respectively included for the three time periods.
The final grouping illustrates cyclogenesis and cyclolysis locations during the three periods for storms with a average SLP less than or equal to 1005 mb during its track and that have lasted at least 24 hours. The smaller dots indicate higher pressure and larger dots lower pressure at the time of development or dissipation.
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- Storm Tracks and Related Fields
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| Past 10 days |
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| Past 30 days |
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| Past 90 days |
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Latitude-time and time-longitude plots of storm days per pentad [the number of closed circulations (6-hr data) divided by 4 in a 10 x 10 degree region] for selected cross sections in the northern hemisphere. Each figure below contains four panels corresponding to different cross sections from the western Pacific to the Atlantic.
Each panel contains two figures (one showing the location of the area of interest and the second storm days as defined above). A three pentad running mean is applied to the data.
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| Latitude-Time: West/Central Pacific |
Latitude-Time: East Pacific/CONUS |
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| Latitude-Time: Atlantic |
Time-longitude: Northern Hemisphere |
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Storm tracks and associated total precipitation (mm), mean anomalous 925 mb wind vectors (m/s), and mean significant wave heights (m) (from the Ocean Prediction Center) for the GFS operational and ensemble mean forecasts for week 1.
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| GFS Operational: Week 1 |
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| GFS Ensemble Mean: Week 1 |
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| GFS Operational: Week 1 |
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| GFS Ensemble Mean: Week 1 |
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| GFS Operational: Week 1 |
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| GFS Ensemble Mean: Week 1 |
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Storm Track Climatology
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Average seasonal frequency of storms binned into 5x5 degree grid boxes for
(a) winter (JFM), (b) spring (AMJ), (c) summer (JAS), and (d) fall (OND). The frequencies are calculated from the 1950-2002 time period.
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ENSO Composites
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January, February, and March (JFM) storm track frequency binned into 5x5 degree grid boxes composited by ENSO phase. Composites are calculated using the Oceanic Nino Index (ONI) defined as the three month running mean of SST anomalies for the NINO 3.4 region.
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Average JFM storm track frequency difference for (top panel) strong El Nino (ONI greater than or equal to 1.5) minus Neutral conditions and (bottom panel) strong La Nina (ONI less than or equal to -1.5) minus Neutral conditions.
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Eichler, T. and R. W. Higgins, 2005: Climatology and ENSO-Related Variability of North American Extratropical Cyclone Activity, J. Climate, Accepted.
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