Computed maximum wind gust speeds

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Computed maximum wind gust speeds

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CANAD Ser Trn B92 no. 35 c. 2 ANALYZED

COMmrmED MCUEIFltTM WPmD GUST

SPEEDS

by

M,K, Thomas and

V.W.

Boyd

3 11 C4' " L / .

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C O M P I J W HAXIMmJt W I N D GUST SPEWS

by

M,K, Thomas and. D.W. Boyd

The laaxhum wind gust speed can be defined as the

highest wind speed that wlll occur, on t h e average, once in

a given munber of yeara, Theere high wlnd g u s t s usually ?Last

f o r only a few seconds and cantherefore be measured o n l y

with an anemometer whose response is of t h e order

of

a second

or two. There a r e few such anemometers connected t o recording

apparatus in Canada; in practice, therefore, these g u s t s must b e rsstlmated f ~ o m ~ f 3 c o I - d ~ of mean wind speeds*

The number of files of wlnd passing cup anemometer8

In

each h o w a r e the only records of wind speeda that w e readily

a v a i l a b l e f o r most Canadran s t ~ t i o n s . Thomas

(I)

conrparsd

these hourly mileages at a flew stations w l t h the corresponding

peak g u s t s recorded by

Dines

pressme-tube anemometers, and

d e r i v e d the following equation:

where G(Max.) l a the rnaxlanum @st speed and

V

is t h e #in&

mileage for one hour a a read from the three-cup anemograph,

The computed maximum gust speeds listed in this note

are

baaed an the maximum reported hourly a l e a g e in a t h t r t y

gear- peritod, whenever such r e c o r d s are available,

It

1s

assumed t h a t t h e memometer I s exposed In each case so that It will g i v e wlnd speeds wMch are representative of average exposure at a height of about thZrty feet above ground Zovel,

Complete thirty-year willdl speed records a r e available f o r a ~ e Z a t i v e l y s m a l l m b e r of etaSions, Shorter records have been adjusted to make them comparnble to the camploke

ones, and values f o r stations w i t h o u k memometers have been

astimated from nearby atationa, The flnaL computed values

have b e e n rounded o f f to the nearest; ffve m i l e s per hour,

A chart ahowing the v a r i a t l o n a in the computed

maximum gust speed across Canada haa been published in the Natlanal Bullding Code ( 2 ) and

_in

_the_{GZimatalogica3.}_Atlas

of Canada

( 3 ) .

In

some cases

Zt

will be found t h a t the values l i s t e d in thls note do not agree precisely with t h e chart.

(4)

Di~crepancdes arise because it i s not always p o s s i b l e t a

chart local

oarfations,

especielly

in

meas where there a r e

great variations in wlnd speeds

across

s h o r t distances,

Records f o r stations not l l s t e d o m be ab.bai9ed by

w r i t i n g

"to the Searetar$, Associate Committee

on

the National

Building Code, National Research ComciL1, Ottawa,

R e f erenoes

(1) Thomas,

M.K.,

Computed gust apeeds In Canada, NetearolLogiaal Dfvision, Dept

,

sf Transport,

CD-2328, TEc-IS~, July 1953,

(2) Natlonaf Research Councfl of Canada, Assac. C o d t t e e

an the National Building Code, National Building Code of Canada

1953,

( 3 )

Climatological atlas

of

Canada* Prepared by M.K. Thomag.

December 1953, ( A joint publxcat ion aT the Meteorological

Division, Dept, of Transport and the Dfvislon of Bullding

Research, National Research Council of Canada,)

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COMPUTED MAXIMUM W r m D GTJST 3PZmS Aldergrove Chilliwaek Camox Estevag P o i n t Fort Nelson Holb erg Hope K d o o p s Masset Mat squi ALBERTA C a l g a r y 100 Claresholm Cold Lake

115

100 Edmonton 100 Grande P r a i r i e L e t h b r ldge 120

95

Dundwxl 90 Moose Jaw 100 Prince Albert 90 MANITOBA New Wsstmlnst er Penticton Prince George Prince Rupert 100 75 Swift River Toffno ₁₀₀

75

Vancouver Victoria

_{l o o}

90 Warf Peld ₈₅ Mcbrray Medicine Hat 95 Namao 105 100 Red Deer 100 Vegrevllle 100 Wainwfght 106 Regina 40 Saakatoon Swift Currant ₁₀₅

95

Portage

la

Prairie

90

Rivers _{9 6} St, V i t a l ₄₀ S h i l o C a m p 90 The Paer ₉₀ Wlnnip e g 90

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m8 Armstrong Aurora Barrle BarrierieXd B t l L e v t l l e B l h d River B r a n t f ord Camp Borden Centralia Chat ham C l h t o n Cabourg Dona Downsview E d g m Faf conbridge Fort W i l l i a m Faymount Glouce ster Guelph HamiZtan Hapu aka s ing Kingston K i t chener London Malt on Nlagara Falls North Bay O s h ~ w a Ot; t awa Owen Sound P a g m Panlour Petawawa P e t erborough P i c t o n Port Arthur P o r t Maitland Rockcliffe St, Catherlnea St, Thomas Swnf a

Sault Ste, Mmia

S h c o e SLoux Lookoat S t ~ a t f o r d Sudbury T M n a T o r o n t o Trenton lie l l m d Weston Wfndsor VJoadstack Casey Clafka City Dorval H u l l Knob Lake Lachina Mont Jsli Monkpeal Out remont Parent Port Harrison Quebec City St, F e l i c i e n St, Hubert St, Johns St, Javita S a m e t e r r e Seven Islands She~broeke Thee RZvsrs Y a l c m t Z e r V a l dtOr Verdun

(7)

Copnwallie Dartmouth Debert "igW G F ~ enwod Corner \Brook Gander Goose Dawaon Snag Aklavik Cambridge Berg Coral Harbour Fort Norman 90 HcClTvney 90 Monc t on 95 Ranous 100 Saint John H a l i f a x Newpert Sydney Wind SOT Yarmoutb

PRI,NCE EDWARD ISLAKD

S t , Johnfs Torbay HORTHWEST TERRITORIES Froblaher 120 Padloping

Ialand

120 Resolute 100 PellowMtf

s

90