Expert forecasts for 2013 N Atlantic season
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cycloneye
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Re: Expert forecasts for 2013 season (CSU 2 week forecast up)
The first 2 week forecast by CSU is up at first post.
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cycloneye
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Re: Expert forecasts for 2013 season (TSR August forecast is up)
The August forecast by TSR is up at first post. They have 15/7/3.
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ninel conde
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cycloneye
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Re: Expert forecasts for 2013 season (TSR August forecast is up)
Here are the most important points by TSR in their August forecast.
Based on current and projected climate signals, North Atlantic basin tropical cyclone activity in 2013 is forecast to be about 20% above the long-term (1950-2012) norm and 20% below the recent 2003-2012 10-year norm. U.S. landfalling hurricane activity is forecast to be close to the 2003-2012 10-year norm.
TSR forecasts:
•15 tropical storms including seven hurricanes and three intense hurricanes. This compares to long-term norms of 11, six and three respectively.
•An ACE (Accumulated Cyclone Energy) value of 121 (up slightly from the July forecast of 112). The long-term norm is 103.
•A 49% likelihood that activity will be in the top one-third of years historically (up slightly from the July forecast likelihood of 42%).
•Four tropical storm and two hurricane landfalls on the U.S. mainland.
TSR's outlook for U.S. hurricane landfalls employs July tropospheric wind anomalies over North America, the East Pacific and North Atlantic.
The TSR basin forecast has incresed slightly since early July because North Atlantic sea surface temperatures in August-September 2013 are expected to be slightly warmer than thought previously.
The precision of TSR's August forecasts between 1980 and 2012 is high for upcoming Atlantic hurricane activity and moderate for U.S. hurricane activity.
Based on current and projected climate signals, North Atlantic basin tropical cyclone activity in 2013 is forecast to be about 20% above the long-term (1950-2012) norm and 20% below the recent 2003-2012 10-year norm. U.S. landfalling hurricane activity is forecast to be close to the 2003-2012 10-year norm.
TSR forecasts:
•15 tropical storms including seven hurricanes and three intense hurricanes. This compares to long-term norms of 11, six and three respectively.
•An ACE (Accumulated Cyclone Energy) value of 121 (up slightly from the July forecast of 112). The long-term norm is 103.
•A 49% likelihood that activity will be in the top one-third of years historically (up slightly from the July forecast likelihood of 42%).
•Four tropical storm and two hurricane landfalls on the U.S. mainland.
TSR's outlook for U.S. hurricane landfalls employs July tropospheric wind anomalies over North America, the East Pacific and North Atlantic.
The TSR basin forecast has incresed slightly since early July because North Atlantic sea surface temperatures in August-September 2013 are expected to be slightly warmer than thought previously.
The precision of TSR's August forecasts between 1980 and 2012 is high for upcoming Atlantic hurricane activity and moderate for U.S. hurricane activity.
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cycloneye
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Re: Expert forecasts: (August NOAA forecast up at first post)
NOAA August forecast is up at first post.
The highlights from this August forecast are the following:
•13-19 Named Storms
•6-9 Hurricanes
•3-5 Major Hurricanes
•Accumulated Cyclone Energy (ACE) range of 120%-190% of the median.
The highlights from this August forecast are the following:
•13-19 Named Storms
•6-9 Hurricanes
•3-5 Major Hurricanes
•Accumulated Cyclone Energy (ACE) range of 120%-190% of the median.
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cycloneye
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Re: Expert forecasts: (NOAA August forecast up at first post)
Here are some more important highlights from the NOAA August forecast:
As predicted in May, atmospheric and oceanic anomalies across the tropical Atlantic Ocean and Caribbean Sea (called the Main Development Region, MDR) are now conducive to an above-normal Atlantic hurricane season. These conditions are expected to persist throughout the peak months (August-October) of the hurricane season in association with the tropical multi-decadal signal, which has contributed to the high activity era that began in 1995. This signal is linked to above-average sea surface temperatures in the MDR and to an enhanced west African monsoon, both of which are now in place.
The presence of two named storms in the deep tropical Atlantic during June-July reinforces the expectation for an above-normal season. Historically, years with early-season activity in this region have a high likelihood of being above-normal, with many also being very active (i.e., hyper-active).
A third factor for the season is the likely continuation of ENSO-neutral conditions. There is only a low probability (19%) that La Niña will develop and further enhance the activity, and an even lower probability (8%) that El Niño will develop and suppress the activity.
As predicted in May, atmospheric and oceanic anomalies across the tropical Atlantic Ocean and Caribbean Sea (called the Main Development Region, MDR) are now conducive to an above-normal Atlantic hurricane season. These conditions are expected to persist throughout the peak months (August-October) of the hurricane season in association with the tropical multi-decadal signal, which has contributed to the high activity era that began in 1995. This signal is linked to above-average sea surface temperatures in the MDR and to an enhanced west African monsoon, both of which are now in place.
The presence of two named storms in the deep tropical Atlantic during June-July reinforces the expectation for an above-normal season. Historically, years with early-season activity in this region have a high likelihood of being above-normal, with many also being very active (i.e., hyper-active).
A third factor for the season is the likely continuation of ENSO-neutral conditions. There is only a low probability (19%) that La Niña will develop and further enhance the activity, and an even lower probability (8%) that El Niño will develop and suppress the activity.
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cycloneye
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Re: Expert forecasts: (NOAA August forecast up at first post)
This long discussion about the expert forecasts was made earlier today by Dr Jeff Masters.
As we stand on the cusp of the peak part of hurricane season, all of the major groups that perform long-range seasonal hurricane forecasts are still calling for an active 2013 Atlantic hurricane season. NOAA forecasts an above-normal and possibly very active Atlantic hurricane season in 2013, in their August 8 outlook. They give a 70% chance of an above-normal season, a 25% chance of an near-normal season, and 5% chance of a below-normal season. They predict a 70% chance that there will be 13 - 19 named storms, 6 - 9 hurricanes, and 3 - 5 major hurricanes, with an Accumulated Cyclone Energy (ACE) 120% - 190% of the median. If we take the midpoint of these numbers, NOAA is calling for 16 named storms, 7.5 hurricanes, 4 major hurricanes, and an ACE index 155% of normal. This is well above the 1981 - 2010 average of 12 named storms, 6 hurricanes, and 3 major hurricanes. Hurricane seasons during the active hurricane period 1995 - 2012 have averaged 15 named storms, 8 hurricanes, and 4 major hurricanes, with an ACE index 151% of the median.
NOAA cites five main reasons to expect an active remainder of hurricane season:
1) Sea Surface Temperatures (SSTs) are above average in the Main Development Region (MDR) for hurricanes, from the coast of Africa to the Caribbean. As of August 9, SST were 0.4°C (0.8°F) above average.
2) Trade winds are weaker than average across the MDR, which has caused the African Monsoon to grow wetter and stronger, the amount of spin over the MDR to increase, and the amount of vertical wind shear to decrease.
3) No El Niño event is present or expected this fall.
4) There have been two early-season tropical storms in the deep tropics (Tropical Storms Chantal and Dorian), which is generally a harbinger of an above-normal season.
5) We are in an active hurricane period that began in 1995.
Colorado State predicts a much above-average hurricane season
A much above-average Atlantic hurricane season is on tap for 2013, according to the seasonal hurricane forecast issued August 2 by Dr. Phil Klotzbach and Dr. Bill Gray of Colorado State University (CSU). The CSU team is calling for 18 named storms, 8 hurricanes, and 3 intense hurricanes, and an Accumulated Cyclone Energy (ACE) of 142. The forecast calls for an above-average chance of a major hurricane hitting the U.S., both along the East Coast (40% chance, 31% chance is average) and the Gulf Coast (40% chance, 30% chance is average). The risk of a major hurricane in the Caribbean is also above average, at 53% (42% is average.)
Analogue years
The CSU team picked five previous years when atmospheric and oceanic conditions were similar to what we are seeing this year: cool neutral ENSO conditions and slightly above-average tropical Atlantic sea surface temperatures. Those five years were 2008, a very active year with 16 named storms and 4 major hurricanes--Gustav, Ike, Paloma, and Omar; 2007, an active year with 15 named storms and two Category 5 storms--Dean and Felix; 1996, an above average year with 13 named storms and 6 major hurricanes--Edouard, Hortense, Fran, Bertha, Isidore, and Lili; 1966, an average year with 11 named storms and 3 major hurricanes--Inez, Alma, and Faith; and 1952, a below average year with 7 named storms and 3 major hurricanes. The average activity during these five analogue years was 12.4 named storms, 7.2 hurricanes, and 3.8 major hurricanes.
TSR predicts an above-average hurricane season: 14.8 named storms
The August 6 forecast for the 2013 Atlantic hurricane season made by British private forecasting firm Tropical Storm Risk, Inc. (TSR) calls for an active season with 14.8 named storms, 6.9 hurricanes, 3 intense hurricanes, and an Accumulated Cyclone Energy (ACE) of 121. The long-term averages for the past 63 years are 11 named storms, 6 hurricanes, 3 intense hurricanes, and an ACE of 103. TSR rates their skill level as good for these August forecasts--47% - 59% higher than a "no-skill" forecast made using climatology. TSR predicts a 58% chance that U.S. land falling activity will be above average, a 26% chance it will be near average, and a 16% chance it will be below average. They project that 4 named storms will hit the U.S., with 1.8 of these being hurricanes. The averages from the 1950-2012 climatology are 3.1 named storms and 1.4 hurricanes. They rate their skill at making these August forecasts for U.S. landfalls just 9% - 18% higher than a "no-skill" forecast made using climatology. In the Lesser Antilles Islands of the Caribbean, TSR projects 1.4 named storms, 0.6 of these being hurricanes. Climatology is 1.1 named storms and 0.5 hurricanes.
TSR's two predictors for their statistical model are the forecast July - September trade wind speed over the Caribbean and tropical North Atlantic, and the forecast August - September 2013 sea surface temperatures in the tropical North Atlantic. Their model is calling for warmer than average SSTs and near average trade winds during these periods, and both of these factors should act to increase hurricane and tropical storm activity.
FSU predicts an above-average hurricane season: 15 named storms
The Florida State University (FSU) Center for Ocean-Atmospheric Prediction Studies (COAPS) issued their fifth annual Atlantic hurricane season forecast on May 30, calling for a 70% probability of 12 - 17 named storms and 5 - 10 hurricanes. The mid-point forecast is for 15 named storms, 8 hurricanes, and an accumulated cyclone energy (ACE) of 135. The scientists use a numerical atmospheric model developed at COAPS to understand seasonal predictability of hurricane activity. The model is one of only a handful of numerical models in the world being used to study seasonal hurricane activity and is different from the statistical methods used by other seasonal hurricane forecasters such as Colorado State, TSR, and PSU (NOAA uses a hybrid statistical-dynamical model technique.) The FSU forecast has been one of the best ones over the past four years:
2009 prediction: 8 named storms, 4 hurricanes. Actual: 9 named storms, 3 hurricanes
2010 prediction: 17 named storms, 10 hurricanes. Actual: 19 named storms, 12 hurricanes
2011 prediction: 17 named storms, 9 hurricanes. Actual: 19 named storms, 7 hurricanes
2012 prediction: 13 named storms, 7 hurricanes. Actual: 19 named storms, 10 hurricanes
Penn State predicts an above-average hurricane season: 16 named storms
A statistical model by Penn State's Michael Mann and alumnus Michael Kozar is calling for an active Atlantic hurricane season with 16 named storms, plus or minus 4 storms. Their prediction was made using statistics of how past hurricane seasons have behaved in response to sea surface temperatures (SSTs), the El Niño/La Niña oscillation, the North Atlantic Oscillation (NAO), and other factors. The statistic model assumes that in 2013 the May 0.87°C above average temperatures in the MDR will persist throughout hurricane season, the El Niño phase will be neutral to slightly warm, and the North Atlantic Oscillation (NAO) will be near average.
The PSU team has been making Atlantic hurricane season forecasts since 2007, and these predictions have done pretty well, except for in 2012, when an expected El Niño did not materialize:
2007 prediction: 15 named storms, Actual: 15
2009 prediction: 12.5, named storms, Actual: 9
2010 prediction: 23 named storms, Actual: 19
2011 prediction: 16 named storms, Actual: 19
2012 prediction: 10.5 named storms, Actual: 19
UK Met Office predicts a slightly above-average hurricane season: 14 named storms
The UKMET office forecast for the 2013 Atlantic hurricane season, issued May 13, calls for slightly above normal activity, with 14 named storms, 9 hurricanes, and an ACE index of 130. In contrast to the statistical models relied upon by CSU, TSR, and NOAA, the UKMET model is done strictly using two dynamical global seasonal prediction systems: the Met Office GloSea5 system and ECMWF system 4. In 2012, the Met Office forecast was for 10 tropical storms and an ACE index of 90. The actual numbers were 19 named storms and an ACE index of 123.
As we stand on the cusp of the peak part of hurricane season, all of the major groups that perform long-range seasonal hurricane forecasts are still calling for an active 2013 Atlantic hurricane season. NOAA forecasts an above-normal and possibly very active Atlantic hurricane season in 2013, in their August 8 outlook. They give a 70% chance of an above-normal season, a 25% chance of an near-normal season, and 5% chance of a below-normal season. They predict a 70% chance that there will be 13 - 19 named storms, 6 - 9 hurricanes, and 3 - 5 major hurricanes, with an Accumulated Cyclone Energy (ACE) 120% - 190% of the median. If we take the midpoint of these numbers, NOAA is calling for 16 named storms, 7.5 hurricanes, 4 major hurricanes, and an ACE index 155% of normal. This is well above the 1981 - 2010 average of 12 named storms, 6 hurricanes, and 3 major hurricanes. Hurricane seasons during the active hurricane period 1995 - 2012 have averaged 15 named storms, 8 hurricanes, and 4 major hurricanes, with an ACE index 151% of the median.
NOAA cites five main reasons to expect an active remainder of hurricane season:
1) Sea Surface Temperatures (SSTs) are above average in the Main Development Region (MDR) for hurricanes, from the coast of Africa to the Caribbean. As of August 9, SST were 0.4°C (0.8°F) above average.
2) Trade winds are weaker than average across the MDR, which has caused the African Monsoon to grow wetter and stronger, the amount of spin over the MDR to increase, and the amount of vertical wind shear to decrease.
3) No El Niño event is present or expected this fall.
4) There have been two early-season tropical storms in the deep tropics (Tropical Storms Chantal and Dorian), which is generally a harbinger of an above-normal season.
5) We are in an active hurricane period that began in 1995.
Colorado State predicts a much above-average hurricane season
A much above-average Atlantic hurricane season is on tap for 2013, according to the seasonal hurricane forecast issued August 2 by Dr. Phil Klotzbach and Dr. Bill Gray of Colorado State University (CSU). The CSU team is calling for 18 named storms, 8 hurricanes, and 3 intense hurricanes, and an Accumulated Cyclone Energy (ACE) of 142. The forecast calls for an above-average chance of a major hurricane hitting the U.S., both along the East Coast (40% chance, 31% chance is average) and the Gulf Coast (40% chance, 30% chance is average). The risk of a major hurricane in the Caribbean is also above average, at 53% (42% is average.)
Analogue years
The CSU team picked five previous years when atmospheric and oceanic conditions were similar to what we are seeing this year: cool neutral ENSO conditions and slightly above-average tropical Atlantic sea surface temperatures. Those five years were 2008, a very active year with 16 named storms and 4 major hurricanes--Gustav, Ike, Paloma, and Omar; 2007, an active year with 15 named storms and two Category 5 storms--Dean and Felix; 1996, an above average year with 13 named storms and 6 major hurricanes--Edouard, Hortense, Fran, Bertha, Isidore, and Lili; 1966, an average year with 11 named storms and 3 major hurricanes--Inez, Alma, and Faith; and 1952, a below average year with 7 named storms and 3 major hurricanes. The average activity during these five analogue years was 12.4 named storms, 7.2 hurricanes, and 3.8 major hurricanes.
TSR predicts an above-average hurricane season: 14.8 named storms
The August 6 forecast for the 2013 Atlantic hurricane season made by British private forecasting firm Tropical Storm Risk, Inc. (TSR) calls for an active season with 14.8 named storms, 6.9 hurricanes, 3 intense hurricanes, and an Accumulated Cyclone Energy (ACE) of 121. The long-term averages for the past 63 years are 11 named storms, 6 hurricanes, 3 intense hurricanes, and an ACE of 103. TSR rates their skill level as good for these August forecasts--47% - 59% higher than a "no-skill" forecast made using climatology. TSR predicts a 58% chance that U.S. land falling activity will be above average, a 26% chance it will be near average, and a 16% chance it will be below average. They project that 4 named storms will hit the U.S., with 1.8 of these being hurricanes. The averages from the 1950-2012 climatology are 3.1 named storms and 1.4 hurricanes. They rate their skill at making these August forecasts for U.S. landfalls just 9% - 18% higher than a "no-skill" forecast made using climatology. In the Lesser Antilles Islands of the Caribbean, TSR projects 1.4 named storms, 0.6 of these being hurricanes. Climatology is 1.1 named storms and 0.5 hurricanes.
TSR's two predictors for their statistical model are the forecast July - September trade wind speed over the Caribbean and tropical North Atlantic, and the forecast August - September 2013 sea surface temperatures in the tropical North Atlantic. Their model is calling for warmer than average SSTs and near average trade winds during these periods, and both of these factors should act to increase hurricane and tropical storm activity.
FSU predicts an above-average hurricane season: 15 named storms
The Florida State University (FSU) Center for Ocean-Atmospheric Prediction Studies (COAPS) issued their fifth annual Atlantic hurricane season forecast on May 30, calling for a 70% probability of 12 - 17 named storms and 5 - 10 hurricanes. The mid-point forecast is for 15 named storms, 8 hurricanes, and an accumulated cyclone energy (ACE) of 135. The scientists use a numerical atmospheric model developed at COAPS to understand seasonal predictability of hurricane activity. The model is one of only a handful of numerical models in the world being used to study seasonal hurricane activity and is different from the statistical methods used by other seasonal hurricane forecasters such as Colorado State, TSR, and PSU (NOAA uses a hybrid statistical-dynamical model technique.) The FSU forecast has been one of the best ones over the past four years:
2009 prediction: 8 named storms, 4 hurricanes. Actual: 9 named storms, 3 hurricanes
2010 prediction: 17 named storms, 10 hurricanes. Actual: 19 named storms, 12 hurricanes
2011 prediction: 17 named storms, 9 hurricanes. Actual: 19 named storms, 7 hurricanes
2012 prediction: 13 named storms, 7 hurricanes. Actual: 19 named storms, 10 hurricanes
Penn State predicts an above-average hurricane season: 16 named storms
A statistical model by Penn State's Michael Mann and alumnus Michael Kozar is calling for an active Atlantic hurricane season with 16 named storms, plus or minus 4 storms. Their prediction was made using statistics of how past hurricane seasons have behaved in response to sea surface temperatures (SSTs), the El Niño/La Niña oscillation, the North Atlantic Oscillation (NAO), and other factors. The statistic model assumes that in 2013 the May 0.87°C above average temperatures in the MDR will persist throughout hurricane season, the El Niño phase will be neutral to slightly warm, and the North Atlantic Oscillation (NAO) will be near average.
The PSU team has been making Atlantic hurricane season forecasts since 2007, and these predictions have done pretty well, except for in 2012, when an expected El Niño did not materialize:
2007 prediction: 15 named storms, Actual: 15
2009 prediction: 12.5, named storms, Actual: 9
2010 prediction: 23 named storms, Actual: 19
2011 prediction: 16 named storms, Actual: 19
2012 prediction: 10.5 named storms, Actual: 19
UK Met Office predicts a slightly above-average hurricane season: 14 named storms
The UKMET office forecast for the 2013 Atlantic hurricane season, issued May 13, calls for slightly above normal activity, with 14 named storms, 9 hurricanes, and an ACE index of 130. In contrast to the statistical models relied upon by CSU, TSR, and NOAA, the UKMET model is done strictly using two dynamical global seasonal prediction systems: the Met Office GloSea5 system and ECMWF system 4. In 2012, the Met Office forecast was for 10 tropical storms and an ACE index of 90. The actual numbers were 19 named storms and an ACE index of 123.
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ninel conde
Re: Expert forecasts for 2013 N Atlantic season (See 1rst post)
Oh Boy. I can't wait!! Just kidding, it will be as worthless as his first prediction. 
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ninel conde
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SFLcane
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Re:
ninel conde wrote:good news. mr bastardi will be making his revised forecast public next week.
Saw preview today that was free on site JB seems to think the southern united states (florida) could be in for a long season. we shall see
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TheStormExpert
Re: Re:
SFLcane wrote:Saw preview today that was free on site JB seems to think the southern united states (florida) could be in for a long season. we shall see
Yeah and in 2010 he was saying the U.S. was going to have a long season due to the very high number of storms predicted. It seems whenever he states or predicts something the total opposite tends to occur.
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galaxy401
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Re: Re:
TheStormExpert wrote:SFLcane wrote:Saw preview today that was free on site JB seems to think the southern united states (florida) could be in for a long season. we shall see
Yeah and in 2010 he was saying the U.S. was going to have a long season due to the very high number of storms predicted. It seems whenever he states or predicts something the total opposite tends to occur.
To be fair there were a lot of storms then but the main thing is that nearly all of them didn't hit the U.S.
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Got my eyes on moving right into Hurricane Alley: Florida.
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cycloneye
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Re: Expert forecasts (CSU forecast for Aug 16-29 at 1rst post)
CSU released today the two week forecast for August 16-29. Go to first post to read it.
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HURRICANELONNY
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Re: Expert forecasts (CSU forecast for Aug 16-29 at 1rst post)
No link. 
never mind. copy/paste
never mind. copy/paste
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hurricanelonny
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cycloneye
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Re: Expert forecasts (CSU forecast for Aug 16-29 at 1rst post)
HURRICANELONNY wrote:No link.
Fixed it.
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ninel conde
CSU says average for the next 2 weeks. 20-37 ACE.
http://typhoon.atmos.colostate.edu/Incl ... 0_2013.pdf
http://typhoon.atmos.colostate.edu/Incl ... 0_2013.pdf
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Re: Expert forecasts: CSU 30 Aug - Sept 12 (See 1rst post)
After their big bust on their last 2-week forecast I thougt that they would go more conservative and call for average ACE forecast for the next 2 weeks, if it verifies at all.
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Re: Expert forecasts: CSU 30 Aug - Sept 12 (See 1rst post)
The reason why the CSU team is going conservative over the next two weeks despite the favorable MJO phases that would normally indicate high activity:
5) Seasonal Forecast
The most recent seasonal forecast called for an active season. However, given the dearth of activity up to this point, we are hesitant to call for as much as activity during the next two weeks as we would otherwise given the favorable MJO conditions that are being predicted.
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