There are currently no active tropical systems in the North Atlantic.
Friday, April 12th, 2024 21:00 Z Apr. 12, 2024 21:00Z

Other Data

The satellite-derived intensity estimate techniques that used to be linked from this page are now on our "Wind Data" page.

Unified Surface Analysis

Surface analysis includes fronts, highs, lows and other information. You can see tropical waves, tropical cyclones and the Intertropical Convergence Zone (ITCZ). You can learn about the ITCZ here at NOAA or a Wikipedia article here.

The "Unified Surface Analysis" is the combination of surface analysis from the National Hurricane Center (NHC), Weather Prediction Center (WPC), Ocean Prediction Center (OPC) and Honolulu Weather Forecast Office. You can view information about the National Weather Service's (NWS) Unified Surface Analysis by clicking here (PDF) to view a manual on it.

"The Tropical Surface Analysis and NWS Unified Surface Analysis depict the sea level pressure field by showing lines of equal pressure, usually in increments of four millibars (mb) but often in increments of two millibars where the pressure gradient is weaker (especially in the tropics). The analysis also depicts important surface features that affect the weather, including areas of high and low pressure, frontal systems (cold, warm, stationary, and occluded), troughs, tropical cyclones, tropical waves, the Intertropical Convergence Zone (ITCZ), drylines, and squall lines." (quote from NHC page here)

"Beginning 1 June 2011, the Tropical Analysis and Forecast Branch (TAFB) will officially include, as part of its portion of the unified surface analyses (USA), a distinction between the trade wind Intertropical Convergence Zone (hereafter ITCZ) and the monsoon trough ITCZ (hereafter monsoon trough). A second addition to the TAFB portion of the USA will be the depiction of shear lines." You can learn about how these look on the analysis, as well as information about them, in the PDF file here.

Surface Analysis Forecasts

National Oceanic and Atmospheric Administration

U.S. and International Weather Forecasts

Like you can at, each of these sites lets you enter your location for a detailed forecast.

Various Tools

Educational Information

Other Sites About Hurricanes

Page last modified on May 15, 2023