May 6: Tropical Update
A surface low continues to develop just north of the Bahamas (above image courtesy of NOAA). The latest model guidance continues to suggest a ~South Carolina landfall in the Thursday-Friday time period. Whether or not the storm meets tropical storm criteria as Ana, the energy will linger near the SE US coast over the weekend and eventually lift out with a cold front early next week. What this means is that New Jersey should be spared from any primary tropical or sub-tropical storm impact (wind and coastal flooding). Instead, we should see some much needed widespread rainfall when the remnant energy does pass over New Jersey with other frontal precipitation ~next Tuesday.
The following image represents the output of all current tropical models, also known as a spaghetti plot. From this, a visual mean of track can generally be deduced. Again, the South Carolina landfall impact is suggested for this Thursday-Friday:
Here is the latest tropical forecast discussion directly from the National Weather Service’s National Hurricane Center (NWS NHC):
ZCZC MIATWOAT ALL TTAA00 KNHC DDHHMM SPECIAL TROPICAL WEATHER OUTLOOK NWS NATIONAL HURRICANE CENTER MIAMI FL 800 AM EDT WED MAY 6 2015 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: 1. Disorganized showers and thunderstorms extending over portions of Florida, the Bahamas, and adjacent waters are associated with an upper-level trough and a weak surface low located over the northwestern Bahamas. The aircraft reconnaissance mission scheduled for this afternoon has been cancelled. However, conditions are expected to become gradually more favorable for development over the next day or so while the system moves slowly northward. A subtropical or tropical cyclone could form by Thursday or Friday, and interests along the southeast coast of the United States should monitor the progress of this system through the weekend. The next Special Tropical Weather Outlook will be issued on this system by 8 PM EDT today. For additional information, see High Seas Forecasts issued by the National Weather Service. * Formation chance through 48 hours...medium...60 percent * Formation chance through 5 days...medium...60 percent High Seas Forecasts issued by the National Weather Service are available under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and on the Web at http://www.opc.ncep.noaa.gov/shtml/NFDHSFAT1.shtml Forecaster Brennan
In English: Tropical Storm Ana (once formed) should not hit the NJ coast directly. It should instead, hit South Carolina and ride up the coast as remnant rainfall early next week. Be safe! JC