DEW
  • DEW
  • Advanced Member Topic Starter
21 May 2019 17:20:33

We've seen tropical storms in the Indian Ocean already but the main focus of this thread is intended to be closer to home in the N Atlantic, but not excluding interesting developments elsewhere.


First named storm of the season, Andrea, has put in an appearance near Bermuda yesterday (20th), 12 days before the official start of the season. It was a weak affair and has probably dissipated by the time you read this.


https://www.wunderground.com/cat6/Subtropical-Storm-Andrea-Weakens-Depression-Jaguar-Roams-South-Atlantic?cm_ven=cat6-widget


 


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
DEW
  • DEW
  • Advanced Member Topic Starter
24 May 2019 15:01:21

NOAA forecast issued Thursday 23rd is for a near-normal season for hurricanes.


"If we take the midpoint of these ranges, NOAA called for 12 named storms, 6 hurricanes and 3 major hurricanes. This is the same as the 1981-2010 seasonal averages of 12 named storms, 6 hurricanes and 3 major hurricanes."


The sting is in the "if", which conceals a wide range of possibilities, almost so much as to suggest they're guessing! (30% below normal, 30% above normal, 40% normal)


Anyway, a summary with reasons is here


https://www.wunderground.com/cat6/NOAA-Expect-Near-Average-2019-Atlantic-Hurricane-Season?cm_ven=cat6-widget


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Stormchaser
25 May 2019 16:20:41

I must admit, I had a good chuckle upon seeing such non-committal numbers - but to be fair, there's a lack of strong signals to work with; ENSO near neutral to weak positive, the AMO kind of positive but not consistently, Atlantic and Caribbean SST anomalies on the positive side but not massively so for the most part.


Having said that, I'm not convinced that the weakly positive ENSO state, which has proven a bit 'shaky' in recent weeks, can force a significant increase in wind shear across the Atlantic TC development regions. Positive development region SSTs and the weakly positive AMO (which are related) could easily overcome that IMO, and as a result I sense the potential for an above average season, though not necessarily by a lot; maybe 2 or 3 more named storms, including 1 or 2 more hurricanes, than usual.


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DEW
  • DEW
  • Advanced Member Topic Starter
02 June 2019 06:49:03

If this disturbance develops to named status it will be Barry


https://www.nhc.noaa.gov/gtwo.php?basin=atlc&fdays=5


A more extended analysis at


https://www.wunderground.com/cat6/2019-Atlantic-Hurricane-Season-Begins-91L-Gulf-Mexico-Threat-Develop?cm_ven=cat6-widget


whose author is hinting at an above average season by showing similarities between the 2004 situation and now, 2004 having been very active.


Most authorities going for near-average, but one UK-based newcomer, TSR, has produced a May forecast for a below average season but with a similar wide spread to that noted above. TSR rather give the game away in a comment to delight cynics of LRF "They [TSR] rate their skill at making these May forecasts for U.S. landfalls just 0% - 2% higher than a "no-skill" forecast"


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
DEW
  • DEW
  • Advanced Member Topic Starter
05 June 2019 16:53:01

The Gulf of Mexico disturbance never developed though an area of heavy rain is expected to move along the coast toward New Orleans. So the name 'Barry' remains unused for now.


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
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