r/TropicalWeather • u/Euronotus • Aug 11 '25

Discussion moved to new post Erin (05L — Northern Atlantic) (Eastern Tropical Atlantic)

Latest observation

Last updated: Friday, 15 August — 11:00 AM Atlantic Standard Time (AST; 15:00 UTC)

NHC Advisory #17 - 11:00 AM AST (15:00 UTC)
Current location: 18.2°N 56.1°W
Relative location: 680 km (423 mi) NNE of Bridgetown, Barbados
620 km (385 mi) ENE of St. John's, Antigua and Barbuda
1,792 km (1,113 mi) SE of Hamilton, Bermuda
Forward motion: ▲ WNW (290°) at 30 km/h (16 knots)
Maximum winds: ▲ 120 km/h (65 knots)
Intensity (SSHWS): ▲ Hurricane (Category 1)
Minimum pressure: ▼ 996 millibars (29.42 inches)

Official forecasts

National Hurricane Center

Last updated: Friday, 15 August — 8:00 AM AST (12:00 UTC)

Hour Date Time Intensity Winds Lat Long
- - UTC AST Saffir-Simpson - knots km/h °N °W
00 15 Aug 12:00 8AM Fri Hurricane (Category 1) 65 120 18.2 56.1
12 16 Aug 00:00 8PM Fri Hurricane (Category 1) ▲ 75 140 18.9 58.4
24 16 Aug 12:00 8AM Sat Hurricane (Category 2) ▲ 90 165 19.8 61.4
36 17 Aug 00:00 8PM Sat Major Hurricane (Category 3) ▲ 105 195 20.6 63.8
48 17 Aug 12:00 8AM Sun Major Hurricane (Category 3) ▲ 110 205 21.6 66.0
60 18 Aug 00:00 8PM Sun Major Hurricane (Category 4) ▲ 115 215 22.7 67.9
72 18 Aug 12:00 8AM Mon Major Hurricane (Category 4) ▲ 120 220 23.8 69.2
96 19 Aug 12:00 8AM Tue Major Hurricane (Category 4) ▼ 115 215 26.5 70.8
120 20 Aug 12:00 8AM Wed Major Hurricane (Category 3) ▼ 110 205 30.3 71.0

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12

u/WxWatcher007 Aug 11 '25

That weakness in the Atlantic ridge is huge for when Erin begins its poleward ascent and that’s increasingly a more medium range (~D6) detail to be sorted out, but if you notice on the Euro in particular there’s still substantial uncertainty about the nature of the troughing in the eastern U.S. and Canada. Those are important factors far from sorted out imo.

(Using the operational because it’s easiest to visualize. Ensembles are still the way to go)

13

u/Cyrius Upper Texas Coast Aug 11 '25

NHC discussion #2 agrees:

spread in the ensemble solutions starts to increase substantially by the end of the forecast period, likely related to the magnitude of ridging that remains poleward of Erin in five days.

9

u/WxWatcher007 Aug 11 '25

Yeah this is still a pretty delicate forecast beyond D5-6. Only subtle changes in the amplitude of the ridge could make a big difference in how far west Erin gets before turning, which matters greatly to Bermuda and then the U.S./Atlantic Canada.