Aviation Weather Services

2000Z, the forecast calls for scattered thunderstorms with rain phenomena considered potentially hazardous to light aircraft developing and a few becoming severe; the CB clouds have and aircraft with limited operational capabilities. tops at flight level (FL) 450 or 45,000 feet MSL. An AIRMET includes forecast of moderate icing, moderate It should be noted that when information is given in the area turbulence, sustained surface winds of 30 knots or forecast, locations may be given by states, regions, or specific greater, widespread areas of ceilings less than 1,000 feet geological features such as mountain ranges. Figure 13-8 and/or visibilities less than three miles, and extensive shows an area forecast chart with six regions of forecast, mountain obscurement. states, regional areas, and common geographical features. Each AIRMET bulletin has a fixed alphanumeric designator, Inflight Weather Advisories numbered sequentially for easy identification, beginning with Inflight weather advisories, which are provided to en route the first issuance of the day. Sierra is the AIRMET code used aircraft, are forecasts that detail potentially hazardous to denote IFR and mountain obscuration; Tango is used to weather. These advisories are also available to pilots prior denote turbulence, strong surface winds, and low-level wind to departure for flight planning purposes. An inflight shear; and Zulu is used to denote icing and freezing levels. weather advisory is issued in the form of either an AIRMET, SIGMET, or convective SIGMET. Example: BOSS WA 211945 AIRMET AIRMET SIERRA UPDT 3 FOR IFR AND MTN OBSCN AIRMETs (WAs) are examples of inflight weather advisories VALID UNTIL 220200 that are issued every 6 hours with intermediate updates AIRMET IFT…ME NH VT MA CT RI NY NJ AND CSTL issued as needed for a particular area forecast region. The WTRS FROM CAR TO YSJ TO 150E ACK TO EWR TO information contained in an AIRMET is of operational YOW TO CAR OCNL CIG BLW 010/VIS BLW 3SM interest to all aircraft, but the weather section concerns PCPN/BR. CONDS CONT BYD 02Z THRU 08Z Strait of Juan De Fuca SLC Salt Lake City CHI Chicago BOS Boston C C o C s o A t a o C a B S r s a S l e h a t s V a a s y a e r llaV dn a a sntM a t lats b s aoC s n a y n a e n l a la O S t l n l V n l a d a d r e C ts n e a o a t l a n a o h em S a y s r y s caS l n t n W a s t u M m n l o i y i u R l i t F l k q l y a e s a ll a a a i S t a V S s o m B n a J p C g o n e C e a t a S a i t y M r e s e S c l l c a F V y V a S a a a d o M N l M l e e N i y n n M e R C O t C I S S t n t E t i G V n n n A r n c V a s o C N M r R i E s t a e s n a a a u a a C e c s o C t A t N t l r s l S l n l e r C A r f l l l o e t e a i u O p a i o a s l e o o L o s y a y s t m l s r a f p a t R P a b l e H R k c l u i a P C S n i N g e M W i V a D n l g a D o a e a o i s u g e t n h o a T e c e e G n e v o a j l d a a s P s a f M l d a o e N C e h t t e v l d e h a r y t a M o r E e n g s a r t t t c e e C n D s n V I e a m O s a d o S a e o e u R p a W a l s s B f R l G B e e n c e l M u N a C W r y n r d r N e t i e t s n s y a e o A s a e B a s i G l l l n C l l l M l a o l M t u a N l a V o L o N V r E a i d t m w o s l a n M r e e e a v E a iR i a s k v n a r b s ( t S i e a n W S d v t i n a M e d s e a a C L r A a r o M w n k a e G V j A e e g a t n k t aR n o to n a r o e r v r E et t R a tiB o S s l r e M Z l x n a e t i W o h t v d y l r g e ) m G o U L C r S l l a r o V a a e n k y a el n T l a l a V S R C e l t da I l y e M h e t i ta m V l o F o D y C L L t l n a o n i a n t l k t Y r s l t e l W e a S C a r s e a tc e P h l y M d tn l s o M o C l o T o l E w e P h t t o n o n n p i e r s a a t i w l W c e M l M tn a U s s r D s s h k t h t u i C t v G n n re a en F o o i Riv W er t d o t s e o W n f a A i S r n Bas u in e n M d r B e W V r e e R s t a a a r i C S n v E W R t s s l o e l S W s C B n r i e N n Y o t M a i B y M i e n N R g f io W t G n e s r n a n a n S de V W t n C s a F l ley H n t s J o i t r n a o o i s B a u M o n l C d r n l a a r D t S t n a t e n C L n s c R i P r v a e n D i s C m o r i D n i e e M C d a t W n v M S M l v t P r m o e V o c a t N n e S n a t d n s O i a e k r n e g e a a r t l o N a r l r W c e s B l s n T M e r R l P d N D o t t y l i L l t h e a o g n M e E s l u o t C s t P t n s i a P r Y f H e E s s is P W B a e t N a a o o R A l s r l i S W E m r S a g Y s v r a E N i k r s n E v i t P o e o t e D / B Y n M e o e e B H w a e r e a i n F M s r r M l r r P r s e c i a n e l V t L D L n x l l o F t c e a s ic n o a a d o o k i s t r v s l N t k w n l W e e i H r e d S e e y P R C V t e a p b o N r R R i h l v S a n M a r a P B u N e A e o i i a H P R y l W N d d E d n S r i e l t l a i n r E r e s n P a h i s l a g i g P t n v k T o l e l n s y k h o s l c e l w e E e e n a P s i r a e a h n p S o k r t h n o o a e t x e R h A C a e e u o V t s f a s s a S e c u w i n r a r e v a r n t t i e r o s l H e d i e n l s s e d t a o s r D l t i s R y S R e h l g f r V C R e t a i a h o v a e o l B n R s N s e l N u i P l e d g e e r D G e r n V e L l v b B y s a H a t E o r R b o S e u a r N e a N i i m S y i r n r n w B d i l l r o N a n d l o l o o v s s e e T a u e s d o D o u r s y k t r t e i r i F t n h r h r a a X t O M h nc K h R i w V s w L C i a d e C k a e e C p a L e e l R C K S l e s s u e N P e e w s L n o e b y t g E o i l a t n t s l a C i i o w r J s c L i a t n l R a n t a a a a e r n a yel k r la n a l r V i d m k l re e v v iR d l s e F H R C N N C e e L S l P i r o i E s o o l o S n l o l s a r a w t a E t u S U s s h i e t n t o p t N e h a r a p u a e M l o l e S t M s a r h r B i t P W t s s V U e N C h e l t s a a e o a n M p W N B i i a s a n l d s p a l l K st s u e C s e t r a t a O e a i y e r p n l N I i n o R z s p s A t W w M a a r C c fl r i S i d N v S a a s r e L e e E o i l W k S W W R C o g a s N r R g C s S x a O o O k e N V a C h i E t L v e E i u M e A r n s a o z o y I e N a m s S n t t s r l t N g a h r t i r l A k r r n t e W s E t t o n i r a r V A o e h a y n s o a k w e S l a r N r o b s l s o l L t h f u e l E L h D W l u o R E e f e B o a a A W L t e o r S w a e y A e t k r e N r a w i M r r h i a s d S l s e W is m e s s g t ip d E p e s a a i h I V i a a a i l n S ley t o o e I S N t a A u B r r L n C e L W e N W o r p r d S H t a M e e o l e r i e i N E E n t W k n a o r s e S t t i e e r x o l o S a o n – D E S s t r r l o I r W R t W S o L f N e h r t S r N E m e P e E h o R U E W e s r C n e L e a N n k m p e i t M M N n ic e n h S s h p o N re e l u in s t e U I l e r a e a N t A l S p r a r r e M W M N a M r W p L o R M b O e a a i I i T l N A S e N c r k h i N A G V d H o e k E E i o M H o l i N a d i r g u L a S n r x R N a h i o l S l R I t N b t l M F l e t l a E l h h a n e N f E r s i a a n V c L v m e e d y d m g e I a r s U r r A S W i C r I i n s n E l n N a h r l p W C n e e a N x A W H p 8 W N t M y a w R n t lrtnC i r l l e r 5 l o l W N s t N t m E r W r n n tsaE T C l e S M a s g h S T O e a n s E o u T s r I E h N t G M N t N u r m x t h e S L A L l E E L H t t E t i O a p n h r b a r T B e r h G m A d a k k s e i i h a o e e l e e a e r y C i E R n S r C c o E d S E a i n h E E v o n r r M e s e i t W g x e x u t r S N r e S t A r o t W i l t E t t l L N a r p r C W n h E N f m m p L x o a o s N e S a t w W S la r r r k W V c E m e t n W C h e W h N r i o P L a s a i e n e s G o e C t d e a B N l M P m A l lle a gh L e r U r ny i s n a e o K o a e t k S E n t u h P p la t n t s F e a au n e C e W o t i t p t a n S y S r i u o n e N O a L a s s C E W N t a C S r h W l t S W C n x n C s e N o n V t t t t a a r e u C r t r a r s G r m l t i s t o l l s u h A t l M f k o P N C S i N o l t S a A r f s l e ta l s a Plain V M m o D E N d N A S S Y f a i M o E E r E E C l o N h C l M t e n n a N a t E C n h y d s s t a V E w E a t s s a a k N a S k k S m il c s l l i R R h l t k l N p e e l o ye s llaV N V N nosduH l r y r a D n e M Gr J i ee n n T C M C C t C n W s I o E N A o a T a s W hite a Mtn C s ta t s H e l n M t P r N t a s M r l l l W a S i E n C W i o s a a st R a N C M m S l E a S E p I e i A e ct i C on o d Lower Keys Florida Straits Figure 13-8. Area forecast region map. 13-11