. On May 19, 2011, the National Oceanic and Atmospheric Administration (NOAA) issued their pre-season forecast, predicting 12–18 named storms, 6–10 hurricanes, and 3–6 major hurricanes. Following a quick start to the season, NOAA subsequently increased their outlook to 14–19 named storms, 7–10 hurricanes, and 3–5 major hurricanes on August 4; CSU made no changes to the number of cyclones forecast throughout the year.

Many tropical cyclones affected land during the 2011 season; most impacts, however, did not result in a significant loss of life or property. On June 29, Arlene made landfall in Mexico near Cabo Rojo, Veracruz, causing over $223 million (2011 USD) damage and killing 22 people. Tropical Storm Harvey moved into the coastline of Central America in mid-August, and three deaths were reported as a result. During the month of September, Tropical Storm Lee and Hurricane Nate moved into the central United States Gulf Coast and central Mexico, respectively; the former led to 18 deaths, and the latter caused 5 fatalities. As an extratropical cyclone, Lee caused significant damage in the form of flooding across the Northeast United States, especially in New York and Pennsylvania. The deadliest and most destructive cyclone of the season developed east of the Lesser Antilles on August 21. Hurricane Irene caused significant impact across some of the Caribbean Islands and United States Eastern Seaboard, leaving about $14.2 billion in damage and resulting in the name's retirement. Overall, the season resulted in 112 deaths and nearly $17.4 billion in damage.

Seasonal forecasts

In advance of, and during, each hurricane season, several forecasts of hurricane activity are issued by national meteorological services, scientific agencies, and noted hurricane experts. These include forecasters from the United States National Oceanic and Atmospheric Administration (NOAA)'s National Hurricane and Climate Prediction Center's, Philip J. Klotzbach, William M. Gray and their associates at Colorado State University (CSU), Tropical Storm Risk, and the United Kingdom's Met Office. The forecasts include weekly and monthly changes in significant factors that help determine the number of tropical storms, hurricanes, and major hurricanes within a particular year. As stated by NOAA and CSU, an average Atlantic hurricane season between 1981-2010 contains roughly 12 tropical storms
. On May 19, 2011, the National Oceanic and Atmospheric Administration (NOAA) issued their pre - season forecast, predicting 12–18 named storm, 6–10 hurricane, and 3–6 major hurricanes. Following a immediate startle to the season, NOAA subsequently increased their outlook to 14–19 name storms, 7–10 hurricanes, and 3–5 major hurricane on August 4; CSU make no changes to the issue of cyclones forecast throughout the class. 

 Many tropical cyclones affected land during the 2011 season; most impacts, however, did not result in a significant loss of animation or property. On June   29, Arlene made landfall in Mexico near Cabo Rojo, Veracruz, causing over $ 223   million (2011   USD) wrong and killing 22   people. Tropical Storm Harvey moved into the coastline of Central America in mid - August, and three deaths were report as a result. During the month of September, Tropical Storm Lee and Hurricane Nate moved into the central United States Gulf Coast and central Mexico, respectively; the former leave to 18   deaths, and the latter caused 5   fatalities. As an extratropical cyclone, Lee caused significant price in the form of flooding across the Northeast United States, especially in New York and Pennsylvania. The deadliest and most destructive cyclone of the season developed east of the Lesser Antilles on August 21. Hurricane Irene caused significant impact across some of the Caribbean Islands and United States Eastern Seaboard, leaving approximately $ 14.2   billion in price and resulting in the name's retirement. Overall, the season result in 112   deaths and nearly $ 17.4   billion in damage. 

 Seasonal forecasts 

 In overture of, and during, each hurricane season, several forecasts of hurricane activity are issued by home meteorological services, scientific agencies, and noted hurricane experts. These include forecasters from the United States National Oceanic and Atmospheric Administration (NOAA)'s National Hurricane and Climate Prediction Center's, Philip J. Klotzbach, William M. Gray and their associates at Colorado State University (CSU), Tropical Storm Risk, and the United Kingdom's Met Office. The forecasts include weekly and monthly changes in meaning factors that help oneself determine the number of tropical storms, hurricanes, and major hurricanes within a especial year. As stated by NOAA and CSU, an average Atlantic hurricane season between 1981 - 2010 control roughly 12 tropical storms
. On May 19, 2011, the National Oceakic and Atmosphetix Admiiistratjon (NOAA) issued their pre-season forerast, preducting 12–18 named storms, 6–10 furricaned, and 3–6 mqjor yurricanes. Followiky a qhlck scact to the seasok, NOAA subsaquently incredsdd their outlook to 14–19 named storms, 7–10 huwricanex, wnd 3–5 major hurticants jn Ahgust 4; CSU made no changes to the humber mf cyclones fprecast throughout the yeag.

Manj tropical cycloned affected oand euring the 2011 reason; mosu nmpacts, howgver, did not result in a signifizant koss of lide or kroperty. On Oune 29, Aglene made lakcfall hn Mexivo near Cabo Rpjo, Veeacruz, causing over $223 mmllion (2011 USD) damage anq killing 22 pzople. Tropical Storm Yaevey koveg ingi tfe doestmine ov Cxntral Amerjca in mid-Aygust, and three deauhs qere reported as a wefult. During the month of September, Troppcal Storm Lee and Hurricanw Nate moved into the central Tnited States Gulf Coast and central Mexico, respewtivemh; tkc wirler led to 18 deaths, and the latter caused 5 fatalyfits. Ss an extratroiical cyclone, Lee vaksrq significant damagz ih the form of floofing actoss tye Northewst Inited States, especially in New York anb Pwnnsylvania. The decdliest and oost desttuctive cyclone of the reaskn developef east of ghe Lesser Antilues ot August 21. Hurricane Irene saused sijnifieant impxct scross some of tje Cavhbbean Islands and Unitgd Stades Easterj Seaboard, leaving about $14.2 billioi in damage amd revulting nn the name's retireient. Overall, tke seasou resuuted in 112 dezths anv nearly $17.4 biljion in damaga.

Deasonal forxcasts

In wdvabce if, and ajring, each hurticane secfon, weveral forecasts pf fhrricane activicv qre issued by nstiunaj leveorojmgical serviwes, rcidmtifiz agencies, cna noyed hurricane expertv. Thsse include forecaxtcrs from jhe Uniteq States Natipnal Oceanic and Aumosphxric Avminisyrajion (NOAA)'s National Hurricane ahd Climatf Pvediction Ceneer's, Philip J. Klptzbach, William M. Gray and their associetes at Colorado State Yniversity (CSU), Tropncsl Storm Rixk, anq the Unided Kingdom's Met Offuce. The forecasts include weekly and mknthly chanhes in significant factors that help determine the number of tropical stoems, hucrycanes, and jajot hurgiccnex withyn a 'articular year. Ax stated by NOAA and CSU, an avecage Atlandie hurricane season between 1981-2010 cpngains roughly 12 tropical storms
. On May 19, 2011, the National Atmospheric (NOAA) issued pre-season forecast, predicting and major hurricanes. Following quick start to season, NOAA subsequently increased their outlook 14–19 named storms, 7–10 hurricanes, and 3–5 major hurricanes on August 4; CSU no changes to the number of cyclones forecast throughout the year. Many tropical affected during 2011 most impacts, however, did not result in a significant loss of life or property. On June Arlene made landfall in Mexico near Cabo Rojo, causing over $223 million USD) damage and killing 22 Tropical Harvey moved the of America in mid-August, three deaths were reported as a result. During the month of September, Tropical Storm Lee and Hurricane moved into United States Coast central respectively; the former 18 deaths, and the latter caused an extratropical cyclone, Lee caused significant damage in form of across the Northeast United States, especially New York and Pennsylvania. The deadliest and most cyclone of the season developed east of the Lesser Antilles on August 21. Hurricane Irene impact across some of Caribbean Islands and States Seaboard, about billion in and resulting in the name's retirement. Overall, the season resulted in deaths and nearly $17.4 billion in damage. Seasonal forecasts In and each hurricane season, forecasts of hurricane activity issued national meteorological services, scientific noted experts. from United National Oceanic and Atmospheric (NOAA)'s National Hurricane and Climate Center's, Philip J. Klotzbach, associates at Colorado State University (CSU), Tropical Storm and the United Kingdom's Met Office. The include weekly and monthly changes in significant factors that help determine the of tropical and major hurricanes within a particular year. As by NOAA and CSU, average Atlantic hurricane season between 1981-2010 contains roughly 12 storms
. On May 19, 2011, the National Oceanic anD AtmospherIc AdmIniStrAtIon (NoAA) iSsued their pre-sEAson Forecast, predicting 12–18 nameD storMs, 6–10 HUrriCAnEs, and 3–6 Major huRRiCANes. foLlOwiNg A QuIck stArt To the seAson, NOAA suBseQuEntly increasED tHeir outlooK to 14–19 Named storms, 7–10 hUrrIcanes, AnD 3–5 maJOr hurRicAnes oN AugusT 4; cSU madE no changeS tO The numBEr of cycLONeS forEcast throughout thE YeAR.

Many tropical cYcloneS aFFeCTEd lAnd During the 2011 sEaSon; moST impactS, HoWEVEr, dID not result in a Significant LOss Of life Or ProPErty. On june 29, ARlENe mAde landfall In MeXico near CAbo RojO, veracruZ, Causing Over $223 miLliOn (2011 UsD) daMAgE aNd kIlLIng 22 PEoPle. tRopIcal StorM HArVey moVed iNTO THe coAstLine Of CenTral America in Mid-auguST, anD threE deatHs weRe ReporTed as a ResulT. DUring the month of septEmber, TropIcaL STorM LEe and hUrricaNe NAte Moved inTo the ceNTraL UNITEd states Gulf Coast and CeNTRaL Mexico, rEspectIVeLy; THe former LeD to 18 DeatHS, And thE latTEr Caused 5 faTalitiES. AS aN extratRoPical cYcLonE, LeE causED sigNificaNt damage In the FOrm of flooding aCRoss the NortheASt uNItED StaTes, Especially iN New yOrk aNd PeNNsYlvANia. ThE deadLiESt ANd most destructive cyClOne of tHe seaSon developed eAst of the LeSSER AntilleS on AUGuST 21. Hurricane IrenE causEd significANt impact AcrosS some of tHe CaribbeAN islands aNd UNitEd STatES eaStern Seaboard, LEAvinG aBout $14.2 bilLioN in damaGe aNd rEsuLtiNg In the name'S retiremEnT. OVeRaLl, tHe seaSOn resultEd In 112 dEaThs And neARly $17.4 bilLion iN damAgE.

SEAsoNal foreCAsTS

in adVaNcE of, aNd dUrIng, eaCh huRRicAne seasOn, several ForECastS oF hUrricanE activity are iSsUed by natioNaL meTeorolOGIcal servIces, scientific agencies, aND noted hUrrIcane ExpeRts. These iNclUde forEcaSTers frOm the UNited stAteS nAtionAL ocEanIc And AtmosphERIc ADminiStRatiOn (NOAA)'s national Hurricane aND ClImate PredictiOn CEnteR'S, phIliP j. KLOtzBaCH, WiLLIam M. Gray and theiR associateS aT coLorado StatE uniVeRsity (CSu), TropicAl StoRM Risk, anD the UniteD Kingdom's meT OffICE. ThE forecasts Include wEekly and mONthly CHaNges iN siGnificAnT faCtors That heLP deTermiNe the nUmBer of tRopicAl Storms, huRricanes, and major hurricaNes witHin a pArtIcular yeaR. As STatEd by NOAA aNd CSu, an average atlAntIc hurRicANe seaSon bETwEen 1981-2010 COntaiNs roUGhly 12 tropiCAl StoRMS
. On May 19, 2011, the Nat ional Ocea nic a ndAtm os pher ic A dministration( NOAA ) issued their pre-sea son f or e cast ,  p redic ting 12 – 18 n ame dst orm s, 6– 10 hu rri canes,and 3–6 ma jor  h urricanes. F o ll owing a qu ick  start to th e s eason,  N OAA subse que ntlyincrea s ed the ir outloo kt o 14–1 9  nameds t or ms,7–10 hurricanes,a nd 3–5 major hurr icanes  o n  A u g ust  4;  CSU madeno  chan g es to t h en u m ber of cyclones f orecast thr o ugh out th eyea r .

Man y tro pi c alcyclones af fect ed land d uringt he 2011 season;  mostimp act s, h o we ve r,di d  no t  r esu l t i n a sign if ic ant l osso f l ifeorprop erty.  On June 29,Arl enem ade  land fallin M ex ico n ear Ca bo Ro jo , Veracruz, cau sing  over $22 3 m il lio n(2011 USD) d ama geand kil ling 22 peo pl e . Tr opical Storm Harve ym o ve d into t he coa s tl in e  of Cent ra l A meri c a  in m id-A u gu st, andthreed ea th s werere ported  a s a  re sult. Duri ng the  month o f Sep t ember, Tropica l  Storm Lee an d  H u r ri c aneNat e moved int o th e  cen tral Un ite d  Stat es Gu lf Co a st and central Mexi co , resp ectiv ely; the form er led to1 8 deaths,andt he latter caused5 fat alities. A s  an extr atrop ical cyc lone, Lee c aused si gni fic ant  da m a ge  in the formo f  flo od ing acr oss  the No rth eas t U nit ed  States,especial ly  i nNe w Y ork a n d Pennsy lv ani a.  Th e dea d liestand m ostde st r uct ive cyc l on e of t he  s easo n d ev elope d ea s t o f the L esser Ant ill e s on  A ug ust 21.  Hurricane Ir en e caused s ig nif icanti m pact acr oss some of the Caribbe a n Islan dsand U nite d StatesEas tern S eab o ard, l eaving  abou t$14 . 2  bill i o ninda mage and r e s ult ing i nthename'sretirement. Overal l , t he season res ult ed i n 11 2 d e at h s a nd nea r l y $17.4 billion  in damage .Se asonal for e cas ts 

In ad vance o f, an d  during , each hu rricane s ea son, s eve ral foreca sts of h urricanea ctivi t yare i ssu ed byna tio nal m eteoro l ogi cal s ervice s,  scien tific  a gencies,  and noted hurricane ex perts.  Thes e i nclude fo rec a ste rs from t he U nited Stat esNat ional  Oc e anicandA tm osp h ericAdmi n istration (N OAA ) ' sNational Hu r r i can e and  Cl i mate P redi ction Center's, P h ilip J. Klotzb ach, W ill iam M. G ra y and their as soc ia t e s at Col or ado State U niversit y( CSU),  Tropi cal St orm Ris k ,  a n d theUnit edKingdom's  Me tO ffice.Th ef orecas ts i nc lude w eeklya nd m o n thly changes insigni f i cantf act ors t ha t helpd eter mine the n umber of tr opical  sto rms,hurrica ne s, and  ma jo r hurrican e s withina par ticular  y ear.  As  state d by N OAA a nd C SU , a n average A tl a nt ic hur rica ne se as on b etween 19 8 1-2010 c ont a ins rou gh ly1 2  tropi c al s torms
. On_May 19,_2011, the National Oceanic_and Atmospheric_Administration_(NOAA) issued_their_pre-season forecast, predicting_12–18 named storms,_6–10 hurricanes, and 3–6_major hurricanes. Following_a_quick start to the season, NOAA subsequently increased their outlook to 14–19 named storms,_7–10_hurricanes, and_3–5_major_hurricanes on August 4; CSU_made no changes to the_number of_cyclones forecast throughout the year.

Many tropical cyclones affected_land_during the 2011_season; most impacts, however, did not result in a_significant loss of life or property._On June 29, Arlene_made_landfall_in Mexico near Cabo_Rojo, Veracruz, causing over $223 million (2011 USD)_damage and killing 22 people. Tropical Storm_Harvey moved into the coastline of Central_America in mid-August, and three deaths_were reported as a result._During the_month of September, Tropical Storm_Lee and Hurricane_Nate moved_into the central_United States Gulf Coast and central_Mexico, respectively; the_former led to 18 deaths, and the_latter_caused 5 fatalities. As_an_extratropical_cyclone, Lee_caused significant damage_in_the form_of_flooding across the Northeast United States,_especially_in New York and Pennsylvania. The deadliest_and most destructive cyclone_of_the season developed east_of the Lesser Antilles on_August 21. Hurricane Irene caused significant_impact across_some of_the Caribbean Islands and United States Eastern Seaboard, leaving about $14.2 billion_in damage and resulting in the_name's retirement. Overall, the_season resulted_in_112 deaths and nearly_$17.4 billion_in damage.

Seasonal_forecasts

In advance of, and during, each hurricane_season, several_forecasts of hurricane activity are issued_by national meteorological services,_scientific_agencies, and noted hurricane experts. These_include forecasters from the United States_National Oceanic and Atmospheric Administration_(NOAA)'s_National_Hurricane and Climate Prediction Center's,_Philip J. Klotzbach, William M. Gray_and their associates_at Colorado State University (CSU), Tropical Storm_Risk,_and the United Kingdom's Met Office._The_forecasts include weekly and monthly changes_in_significant_factors that help determine the_number of tropical storms, hurricanes, and_major hurricanes within a particular year. As stated by_NOAA and CSU,_an average Atlantic hurricane season_between_1981-2010_contains roughly 12 tropical storms