Instructions for Area forecasts for Low Level Flights (SWL)

 

The SWL consists of a graphic part (charts) and a textual part (OUTLOOK).

The CHART is a graphical representation of the forecast of the distribution of significant MET elements at a fixed validity time of the chart (00, 06, 09, 12, 15 or 18 UTC), and significant MET elements that are expected within +/- 1 hour around that time are plotted.

OUTLOOK describes a significant change in the MET elements, compared to those shown on the chart, over the next 3 hours (for 06, 09, 12, and 15 UTC), and the next 6 hours (for 18 and 00 UTC).

Example:

 

SWL issuance and validity times

Regular SWLs are issued 6 times a day, and corrections are issued as needed according to defined criteria. The issuing times for regular SWLs and their validity times are shown in the table:

 

Issue time (UTC)

Validity (UTC)

Chart for

OUTLOOK till

05

09

12

08

12

15

11

15

18

14

18

00

17

00

06

   23 *

06

09

 

* Due to user requirements, a chart for 06 UTC will be created and will be available on the web page met.crocontrol.hr, two hours before the deadline, i.e. at 21 UTC.

Marking of meteorological elements on the chart

Significant MET elements and their distribution are marked on the chart as follows:

  • AREA  - the area bounded by a line which resembles a cloud, in which the same MET elements from the following table predominate: 

 

Chart symbol

Annotation in OUTLOOK

Meaning

Description

Freezing Precipitation (FZRA)

FREEZING PRECIPITATION 

ISOL, OCNL, FRQ

Drizzle (DZ)

 DRIZZLE

Rain (RA)

 RAIN

Snow

(SN)

 SNOW

Shower

(SH)

 SHOWER

A characteristic next to TCU or CB clouds also refer to these phenomena. 

Thunderstorm (TS)

THUNDERSTORM

Thunderstorm with Hail (TSGR)

THUNDERSTORM WITH HAIL

Moderate Icing

(MOD ICE)

MODERATE ICING

The lower and upper limits of the icing layer in hectofeet AMSL are entered next to the symbol.

Severe Icing

(SEV ICE)

SEVERE ICING

Freezing Level

FREEZING LEVEL

Height is expressed in hectofeet AMSL.

Visibility

(VIS)

HORIZONTAL GROUND VISIBILITY

Numerically expressed in kilometres.

Mist

(BR)

WIDESPREAD MIST

A phenomenon is considered widespread if it is spread out horizontally in an area with a diameter of approx. 100km or more.

Fog

(FG)

WIDESPREAD FOG

Haze

(HZ)

WIDESPREAD HAZE

Blowing Snow

(BLSN)

WIDESPREAD BLOWING SNOW

Smoke

(FU)

WIDESPREAD SMOKE

Clouds

(CLD)

CLOUDS

 

(the inscribed symbol is an example of a broken stratocumulus in a layer from 2000 FT to 7000 FT)

The cloud layer description contains:

- the predominant cloud amount

(FEW, SCT, BKN, OVC),

- the predominant cloud type

(ST, SC, CU, AS, AC, NS) or LYR;

- the base and the tops of the clouds in hectofeet AMSL

   (XXX for peaks above FL 100).

Cumulonimbus (CB)

CUMULONIMBUS

Next to CB and TCU clouds, their quantity or characteristic is entered: ISOL, OCNL, FRQ, OBSC, EMBD and SQL.

YYY is the height of the base, and XXX is the height of the top of the cloud, in hectofeet.

In areas with CBs, it is assumed that there are TCUs, so they are not additionally registered.

Towering Cumulus

(TCU)

TOWERING CUMULUS 

 

 

  • AREA  - the area on the chart bounded by a dashed line, which is marked with an ordinal number. Meteorological phenomena in this area are described in the lower left corner of the chart, under the appropriate ordinal number. These areas are used for turbulence and mountain waves:
 

Chart Symbol

Annotation in

OUTLOOK

 Meaning

 Description

Moderate Turbulence

(MOD TURB)

MODERATE TURBULENCE

 

After the symbol, the lower and upper layer boundaries in hectofeet AMSL are entered.

Severe Turbulence

(SEV TURB)

SEVERE TURBULENCE

Moderate mountain waves

(MOD MTW)

MODERATE MOUNTAIN WAVES 

Severe mountain waves

(SEV MTW)

SEVERE MOUNTAIN WAVES 

 

  • Stand-alone MET symbols, which are plotted on the chart, independently of the marked areas (AREA), are shown in the following table:

Chart Symbol

Annotation in

OUTLOOK

Meaning

Description

COLD FRONT

COLD FRONT

 

WARM FRONT

WARM FRONT

OCCLUDED FRONT

OCCLUDED FRONT

STATIONARY FRONT

STATIONARY FRONT

CONVERGENCE LINE

CONVERGENCE LINE

 

LOW PRESSURE CENTRE

Position of the centre of low air pressure, expressed in hectopascals.

Mountain Obscuration

(MT OBSC)

MOUNTAIN OBSCURATION

The phenomenon refers to an area of ​​approximately 75 km around the symbol.

 G40KT

Surface Wind

(WIND)

WIDESPREAD STRONG GROUND WIND WITH MEAN SPEED OF 20KT OR MORE AND WIND GUSTS OF 30KT OR MORE.

The phenomenon refers to an area of approximately 75 km around the symbol.

The symbol may be accompanied by the letter G followed by the wind speed in KT.

The drawn symbol is an example of a northwest wind with a mean speed of 30KT and gusts of 40KT.


 

 

  • For local (LCA) prevalence of the MET element within an area, additional abbreviations can be used:

MAR

LAN

VAL

COT

MT

 

  • The following MET phenomena are not drawn on the chart, but are entered in the Remark section as needed:
    • Funnel Cloud
    • Dust storm / Sandstorm,
    • Volcanic Ash,
    • Radioactive Material in Atmosphere.

OUTLOOK

Significant changes of MET elements in relation to those plotted on the chart are entered in the OUTLOOK. The spatial distribution of phenomena is described by referring to:

  1. An area on the chart bounded by a line of clouds, which is marked by a letter (A, B, (), e.g.:

AREA B -> area on the chart bounded by a line of clouds and marked with a capital letter B.

  1. The area on the chart bounded by a dashed line, which has a numerical mark, e.g.:

AREA 2 -> area on the chart bounded by a dashed line and marked with the number 2.

  1. Descriptive areas. The names of neighbouring countries are used, and Croatia is described in more detail by using the 6 areas shown in the figure:

 

The area, occurrence, trend and, if necessary, the speed and time of change are entered in the OUTLOOK:

AREA

PHENOMENON

TREND

AREA A/B/C/…

AREA 1/2/3/…

MT/N/E Croatia

N/C/S Adriatic

 

LCA

MAR

LAN

VAL

COT

MT

SFC WIND

VIS

BKN/OVC CLD

MT OBSC

TS

TSGR

TCU

FZRA

MOD/SEV ICE

MOD/SEV TURB

MOD/SEV MTW

 

INTSF

WKN

BECMG

CEASING

FROM hh   (u satima UTC)

TILL hh      (u satima UTC)

hh1-hh2       (u satima UTC)

MOV N/NE/E/SE/S/SW/W/NW vvKT

 

 

NO SIGNIFICANT CHANGE

 

Examples: 

  • AREA A MOV E 15KT: OCNL TS FROM 04
  • AREA B: ISOL TSGR 20-22
  • AREA B: OVC CLD 800FT BECMG FROM 21
  • AREA B MAR: ISOL TSGR FROM 21
  • E CROATIA: VIS 0.5 FG BECMG FROM 04
  • N ADRIATIC AND MT CROATIA: SFC WIND 05030G40KT FROM 04
  • AREA 2: MOD TURB CEASING TILL 20
  • AREA A: MOD TURB AND MTW ABV 3000FT FROM 20
  • N AND MT CROATIA: MOD TURB AND MTW ABV 3000FT FROM 20
  • NO SIGNIFICANT CHANGE

 

Kriteriji za unos značajnih promjena u OUTLOOK su isti kao i kriteriji za izdavanje AMD-a, a opisani su u poglavlju koje slijedi.

AMD

The criteria for entering significant changes in the OUTLOOK are the same as the criteria for issuing AMD, and are defined in the chapter that follows. 

MET element

Criteria for significant changes of MET elements

WIND

Formation or disappearance of a widespread* area of surface wind of mean speed more than 30 KT.

LOW VIS

Formation or disappearance of a widespread* area of surface visibility less than 5000 m.

LOW CLD

Formation or disappearance of a widespread* area of BKN or OVC cloud cover with a base below 1000 FT AMSL.

TS

TSGR

The formation or disappearance of an area with thunder or thunder with hail. These phenomena include cumulonimbus (CB) and associated moderate or severe turbulence and moderate or severe icing.

TCU

Formation or disappearance of areas with towering cumulus and associated moderate or severe turbulence and moderate or severe icing.

MT OBSC

Occurrence or disappearance of widespread* mountain obscuration.

MOD/SEV TURB

Beginning or cessation of moderate or severe turbulence.

MOD/SEV ICE

Beginning or cessation of moderate or severe icing.

MOD/SEV MTW

Beginning or cessation of moderate or strong mountain waves.

 

 * Widespread - in an area of ​​approximately 100 km or more in diameter.

 

Chart AMD can be issued at any time after the chart has been issued until the validity time of the chart, but also one hour after the validity time.

Example:

For SWL 09 (CHART VALID AT 09, OUTLOOK TILL 12) issued at 04:35 UTC, Chart AMD can be issued between 04:35 and 10:00 UTC.

 

OUTLOOK AMD can be issued at any time after issuance, until the end of validity. Changes that occur in the last hour of OUTLOOK will not be issued as AMD OUTLOOK, but the change will be included in the following chart.

Example:

For SWL 09 (CHART VALID AT 09, OUTLOOK TILL 12) issued at 04:35 UTC, AMD OUTLOOK can be issued between 04:35 and 11:00 UTC. Changes between 11:00 and 12:00 UTC will be included in the chart for 12 UTC.

 

If AMD is issued due to additional MET elements or deterioration of already predicted MET elements, then these MET elements are entered in the AMD DUE TO section. If AMD is issued due to the removal or weakening of the predicted MET elements then the AMD DUE TO section will read: IMPROVEMENT OF MET CONDITIONS.

Examples:

TS

TCU IN AREA B

VIS IN OUTLOK

MOD MTW IN AREA 2

IMPROVEMENT OF MET CONDITIONS

COR  

A SWL forecast correction (COR) is issued in the case of a subsequently observed error in a previously issued SWL forecast.

Remark

The following MET phenomena are not drawn on the chart, but are entered in the Remark section as needed: 

  • Funnel Cloud
  • Duststorm / Sandstorm,
  • Volcanic Ash,
  • Radioactive Material in Atmosphere.

Other important information can also be entered in the Remark section, in which case the English language and abbreviations used for SWL are used.

SWL Abbreviations

Abbreviation

Meaning

Additional clarification

AC

Altocumulus

 

AGL

Above ground level

 

AMD

Amend

Change

AMSL

Above mean sea level

 

AS

Altostratus

 

BASE

Cloud base

 

BECMG

Becoming

Becomes/arises

BKN

Broken

5-7 eighths of the sky covered with clouds

BR

Mist

 

C

Degrees Celsius

 

CB

Cumulonimbus

 

CEASING

Ceasing

Disappears / stops

CLD

Cloud

 

COR

Correction

 

COT

At the coast

 

CU

Cumulus

 

DS

Duststorm

 

DU

Dust

 

DZ

Drizzle

 

EMBD

Embedded

which fit into the cloud layer / layers with at least two thirds of their total height 

FC

Funnel cloud

 

FEW

Few

1-2 eighths of the sky covered with clouds

FG

Fog

 

FL

Flight level

 

FRQ

Frequent

which occupy more than 75% of the marked area

FT

Feet

 

FZRA

Freezing precipitation

including freezing drizzle (FZDZ)

G

Gust

 

GR

Hail

 

GS

Small hail / snow pellets

 

HPA

Hectopascals

 

HVY

Heavy

 

HZ

Haze

 

ICE

Icing

 

INTSF

Intensifying

 

ISOL

Isolated

which occupy less than 50% of the marked area

KT

Knots

 

L

Low pressure centre

 

LAN

Inland or over land

 

LCA

Locally

 

LYR

Layer

 

MAR

At sea

 

MOD

Moderate

 

MT

Above or covering mountains

 

MT OBSC

Mountain obscuration

 

MTW

Mountain waves

 

NC

No change

 

NSC

No significant cloud

 

OBSC

Obscured

which are covered by haze or smoke

OCNL

Occasional

which occupy between 50% and 75% of the marked area

OVC

Overcast

8 eighths of the sky covered with clouds

PL

Ice pellets

 

PO

Dust/Sand whirls

 

RA

Rain

 

RDOACT

Radioactive

 

SA

Sand

 

SC

Stratocumulus

 

SCT

Scattered

3-4 eighths of the sky covered with clouds 

SEV

Severe

 

SFC

Surface

 

SG

Snow grains

 

SN

Snow

 

SQ

Squall

 

SQL

Squall line

storms lined up in a line with no gaps

SS

Sandstorm

 

ST

Stratus

 

STNR

Stationary

 

SS

Sand storm

 

TCU

Towering cumulus

 

TS

Thunderstorm

 

TURB

Turbulence

 

UTC

Co-ordinated Universal Time

 

VA

Volcanic ash

 

VAL

In valleys

 

VIS

Visibility

 

WKN

Weakening

 

XXX

Above FL100

 

 

 

Naputak za korištenje područne prognoze za letove na nižim nivoima (SWL)

 

SWL se sastoji od grafičkog dijela (Karte) i tekstualnog dijela (OUTLOOK-a).

Karta je grafički prikaz prognoze rasprostranjenosti značajnih MET elemenata u fiksnom terminu važenja Karte (00, 06, 09, 12, 15 ili 18 UTC), a ucrtani su značajni MET elementi koji se očekuju unutar +/- 1 sat oko tog termina.

OUTLOOK opisuje značajnu promjenu MET elemenata, u odnosu na one prikazane na Karti, tijekom slijedeća 3 sata (za termine 06, 09, 12 i 15 UTC), odnosno slijedećih 6 sati (za termine 18 i 00 UTC).

 

Primjer:

 

Vremena izdavanja i važenja SWL

Redovne SWL se izdaje 6 puta dnevno, a ispravci se izdaju prema potrebi po definiranim kriterijima. Termini izdavanja redovnih SWL i njihova vremena važenja prikazana su u tablici:

 

Termin izdavanja (UTC)

Važenje (UTC)

Karta za

OUTLOOK do

05

09

12

08

12

15

11

15

18

14

18

00

17

00

06

   23 *

06

09

 

* Zbog zahtjeva korisnika, karta za 06 UTC će se izrađivati i biti dostupna na web stranici met.crocontrol.hr dva sata prije termina izdavanja, dakle u 21 UTC.

 

Označavanje meteoroloških elemenata na karti

Na Karti se značajni MET elementi i njihova rasprostranjenost označavaju na slijedeći način:

  • AREA  - područje omeđeno linijom koja asocira na oblak, a u kojem prevladavaju podjednaki MET elementi iz slijedeće tablice: 

 

Simbol na karti

Oznaka u

OUTLOOK-u

Značenje

Opis

Freezing Precipitation (FZRA)

PREHLADNA OBORINA 

ISOL, OCNL, FRQ

Drizzle (DZ)

 ROSULJA

Rain (RA)

 KIŠA

Snow

(SN)

 SNIJEG

Shower

(SH)

 PLJUSAK

Karakteristika upisana uz TCU ili CB oblake odnosi se i na ove pojave 

Thunderstorm (TS)

GRMLJAVINSKA OLUJA

Thunderstorm with Hail (TSGR)

GRMLJAVINSKA OLUJA S TUČOM

Moderate Icing

(MOD ICE)

UMJERENO ZALEĐIVANJE

Uz simbol se upisuje  donja i gornja granica sloja zaleđivanja u hekto-feetima AMSL.

Severe Icing

(SEV ICE)

JAKO ZALEĐIVANJE

Freezing Level

VISINA NULTE IZOTERME

Visina je iskazana u hekto-feetima AMSL.

Visibility

(VIS)

PRIZEMNA HORIZONTALNA VIDLJIVOST

Brojčano je iskazana u kilometrima.

Mist

(BR)

RASPROSTRANJENA  SUMAGLICA

Pojava se smatra RASPROSTRANJENOM ako se horizontalno prostire na području promjera cca. 100km ili više 

Fog

(FG)

RASPROSTRANJENA MAGLA 

Haze

(HZ)

RASPROSTRANJENA SUHA  MUTNOĆA

Blowing Snow

(BLSN)

RASPROSTRANJENA SNJEŽNA VIJAVICA

Smoke

(FU)

RASPROSTRANJEN DIM

Clouds

(CLD)

OBLACI

 

(upisani simbol je primjer broken stratokumulusa u sloju od 2000 FT do 7000 FT)

Opis oblačnog sloja sadrži:

- prevladavajuću količinu oblaka

   (FEW, SCT, BKN, OVC),

- prevladavajući rod oblaka

   (ST, SC, CU, AS, AC, NS) ili LYR;

- podnicu i vrhove oblaka

   u hekto-feetima AMSL

   (XXX za vrhove iznad FL 100).

Cumulonimbus (CB)

KUMULONIMBUS

Uz oblake CB i TCU upisuje se njihova  količina ili karakteristika:  ISOL, OCNL, FRQ, OBSC, EMBD i SQL.

YYY je visina podnice, a XXX visina vrha oblaka, u hekto-feetima. 

U području sa CB-ima podrazumijeva se da postoje i TCU-i, pa se oni dodatno ne upisuju.

Towering Cumulus

(TCU)

KUMULUS JAKOG VERTIKALNOG RAZVOJA 

 

 

  • AREA  - područje na karti omeđeno isprekidanom linijom, koje je označeno rednim brojem. Meteorološke pojave u tom području opisane su u donjem lijevom kutu karte, pod odgovarajućim rednim brojem. Ta se područja koriste za turbulenciju i planinske valove:
 

Simbol na karti

Oznaka u

OUTLOOK-u

 Značenje

Opis

Moderate Turbulence

(MOD TURB)

UMJERENA TURBULANCIJA

 

Iza simbola se upisuju  donja i gornja granica sloja u hekto-feetima AMSL.

Severe Turbulence

(SEV TURB)

JAKA TURBULENCIJA

Moderate mountain waves

(MOD MTW)

UMJERENI PLANINSKI  VALOVI 

Severe mountain waves

(SEV MTW)

JAKI PLANINSKI  VALOVI 

 

  • Samostojeći MET simboli, koji se ucrtavaju na Kartu neovisno o označenim područjima (AREA), prikazani su u slijedećoj tablici:

Simbol na karti

Oznaka u

OUTLOOK-u

Značenje

Opis

COLD FRONT

HLADNA FRONTA

 

WARM FRONT

TOPLA FRONTA

OCCLUDED FRONT

OKLUDIRANA FRONTA

STATIONARY FRONT

STACIONARNA FRONTA

CONVERGENCE LINE

LINIJA KONVERGENCIJE

 

CENTAR NISKOG TLAKA ZRAKA

Položaj centra niskog tlaka zraka, izraženog u hekto-paskalima.

Mountain Obscuration

(MT OBSC)

PLANINSKO ZAMRAČENJE

Pojava se odnosi na područje od približno 75 km oko simbola.

 G40KT

Surface Wind

(WIND)

RASPROSTRANJEN JAK PRIZEMNI VJETAR SREDNJE BRZINE 20 KT ILI VIŠE I UDARI VJETRA BRZINE 30KT ILI VIŠE.

Pojava se odnosi na područje  od približno 75 km oko simbola. 

Uz simbol može biti  dopisano slovo G iza kojeg slijedi brzina udara vjetra u KT.

Ucrtani simbol je primjer sjeverozapadnog vjetra srednje brzine 30KT i udara 40KT.


 

 

  • Za lokalnu (LCA) rasprostranjenost MET elementa unutar nekog područja dodatno se mogu koristiti kratice:

MAR

LAN

VAL

COT

MT

 

  • Slijedeće MET pojave se ne crtaju na Kartu, nego se po potrebi unose u rubriku Remark:
    • Pijavica (Funnel Cloud)
    • Prašinska ili pješčana oluja (Duststorm / Sandstorm),
    • Vulkanski pepeo (Volcanic Ash),
    • Radioaktivni materijal u atmosferi (Radioactive Material).

OUTLOOK

U OUTLOOK se upisuju značajne promjene MET elemenata u odnosu na one koji su ucrtani na Karti. Pri tom se prostorna rasprostranjenost pojava opisuju referiranjem na:

  1. područje na karti omeđeno linijom oblaka, koje ima slovnu oznaku (A, B, …), npr.:

AREA B    -> područje na karti omeđeno linijom oblaka i označeno velikim slovom B.

  1. područje na karti omeđeno crtkanom linijom, koje ima brojčanu oznaku, npr.:

AREA 2     -> područje na karti omeđeno crtkanom linijom i označeno brojkom 2.

  1. opisna područja. Koriste se imena susjednih država, a Hrvatskoj se preciznije opisuju kroz 6 područja prikazanih na slici:

 

U OUTLOOK se upisuju područje, pojava, trend i  po potrebi brzina i vrijeme promjene:

PODRUČJE

POJAVA

TREND

AREA A/B/C/…

AREA 1/2/3/…

MT/N/E Croatia

N/C/S Adriatic

 

LCA

MAR

LAN

VAL

COT

MT

SFC WIND

VIS

BKN/OVC CLD

MT OBSC

TS

TSGR

TCU

FZRA

MOD/SEV ICE

MOD/SEV TURB

MOD/SEV MTW

INTSF

WKN

BECMG

CEASING

FROM hh   (u satima UTC)

TILL hh      (u satima UTC)

hh1-hh2       (u satima UTC)

MOV N/NE/E/SE/S/SW/W/NW vvKT

 

 

NO SIGNIFICANT CHANGE

 

Primjeri:

  • AREA A MOV E 15KT: OCNL TS FROM 04
  • AREA B: ISOL TSGR 20-22
  • AREA B: OVC CLD 800FT BECMG FROM 21
  • AREA B MAR: ISOL TSGR FROM 21
  • E CROATIA: VIS 0.5 FG BECMG FROM 04
  • N ADRIATIC AND MT CROATIA: SFC WIND 05030G40KT FROM 04
  • AREA 2: MOD TURB CEASING TILL 20
  • AREA A: MOD TURB AND MTW ABV 3000FT FROM 20
  • N AND MT CROATIA: MOD TURB AND MTW ABV 3000FT FROM 20
  • NO SIGNIFICANT CHANGE

 

Kriteriji za unos značajnih promjena u OUTLOOK su isti kao i kriteriji za izdavanje AMD-a, a opisani su u poglavlju koje slijedi.

AMD

Promjena SWL prognoze (AMD) se izdaje u slučaju značajnih promjena u prognozi MET elemenata, prema slijedećim kriterijima: 

MET element

Kriteriji značajnih promjena MET elemenata

WIND

Nastajanje ili nestajanje rasprostranjenog* područja prizemnog vjetra srednje brzine veće od 30 kt.

LOW VIS

Nastajanje ili nestajanje rasprostranjenog* područja prizemne vidljivosti manje od 5000 m.

LOW CLD

Nastajanje ili nestajanje rasprostranjenog* područja BKN ili OVC naoblake s podnicom ispod 1000 FT AMSL.

TS

TSGR

Nastajanje ili nestajanje područja s grmljavinom ili grmljavinom s tučom. Te pojave podrazumijevaju kumulonimbuse (CB) i s njima povezanu umjerenu ili jaku turbulenciju i umjereno ili jako zaleđivanje. 

TCU

Nastajanje ili nestajanje područja s kumulusima jakog vertikalnog razvoja i s njima povezanu umjerenu ili jaku turbulenciju i umjereno ili jako zaleđivanje.

MT OBSC

Nastajanje ili nestajanje rasprostranjenog* planinskog zamračenja.

MOD/SEV TURB

Početak ili prestanak umjerene ili jake turbulencije.

MOD/SEV ICE

Početak ili prestanak umjerenog ili jakog zaleđivanja.

MOD/SEV MTW

Početak ili prestanak umjerenih ili jakih planinskih valova.

 

rasprostranjeno  –  na području okvirnog promjera 100 km ili više.

 

AMD Karte se može izdati bilo kad nakon izdavanja pa do termina važenja karte, ali i jedan sat nakon toga.

Primjer:

Za SWL 09 (CHART VALID AT 09, OUTLOOK TILL 12) izdanu u 04:35 UTC, AMD karte se može izdati između 04:35 i 10:00 UTC.

 

AMD OUTLOOK-a se može izdati bilo kad nakon izdavanja, pa do kraja važenja, ali za promjene koje se dogode u zadnjem satu OUTLOOK-a neće se izdavati AMD OUTLOOK-a, nego će promjena biti uključena na kartu za termin koji slijedi.

Primjer:

Za SWL 09 (CHART VALID AT 09, OUTLOOK TILL 12) izdanu u 04:35 UTC, AMD OUTLOOK-a se može izdati između 04:35 i 11:00 UTC. Promjene u periodu od 11:00 do 12:00 UTC će se uključiti u kartu za 12 UTC.

 

Ako je AMD izdan zbog dodatnih MET elemenata ili pogoršanja već prognoziranih MET elemenata onda se u rubriku AMD DUE TO  upisuju ti MET elementi. Ako je  AMD izdan zbog uklanjanja ili slabljenja prognoziranih MET elemenata onda se u rubriku AMD DUE TO upisuje informacija: IMPROVEMENT OF MET CONDITIONS.

Primjeri:

TS

TCU IN AREA B

VIS IN OUTLOK

MOD MTW IN AREA 2

IMPROVEMENT OF MET CONDITIONS

COR  

Ispravak SWL prognoze (COR) se izdaje u slučaju naknadno primijećene greške u izdanoj SWL prognozi.

Remark

Slijedeće MET pojave se ne crtaju na kartu, nego se po potrebi unose u rubriku Remark:  

  • Pijavica (Funnel Cloud)
  • Prašinska ili pješčana oluja (Duststorm / Sandstorm),
  • Vulkanski pepeo (Volcanic Ash),
  • Radioaktivni materijal u atmosferi (Radioactive Material).

U rubriku Remark se mogu upisati i druge značajne informacije, u kojem slučaju se koristi engleski jezik i kratice koje se koriste za SWL.

Kratice u SWL

Kratica

Značenje

Dodatno pojašnjenje

AC

Altocumulus

 

AGL

Above ground level

 

AMD

Amend

Promjena

AMSL

Above mean sea level

 

AS

Altostratus

 

BASE

Cloud base

 

BECMG

Becoming

Nastaje / postaje

BKN

Broken

5-7 osmina neba pokriveno oblacima

BR

Mist

 

C

Degrees Celsius

 

CB

Cumulonimbus

 

CEASING

Ceasing

Nestaje / prestaje 

CLD

Cloud

 

COR

Correction

Ispravak 

COT

At the coast

 

CU

Cumulus

 

DS

Duststorm

 

DU

Dust

 

DZ

Drizzle

 

EMBD

Embedded

koje su sa barem dvije trećine svoje ukupne visine uklopljene u oblačni sloj/slojeve

FC

Funnel cloud

 

FEW

Few

1-2 osmine neba pokriveno oblacima

FG

Fog

 

FL

Flight level

 

FRQ

Frequent

koje zauzimaju više od 75%  označenog područja

FT

Feet

 

FZRA

Freezing precipitation

uključuje i prehladnu rosulju (FZDZ)

G

Gust

 

GR

Hail

 

GS

Small hail / snow pellets

 

HPA

Hectopascals

 

HVY

Heavy

 

HZ

Haze

 

ICE

Icing

 

INTSF

Intensifying

 

ISOL

Isolated

koje zauzimaju manje od 50%  označenog područja

KT

Knots

 

L

Low pressure centre

 

LAN

Inland or over land

 

LCA

Locally

 

LYR

Layer

 

MAR

At sea

 

MOD

Moderate

 

MT

Above or covering mountains

 

MT OBSC

Mountain obscuration

 

MTW

Mountain waves

 

NC

No change

 

NSC

No significant cloud

 

OBSC

Obscured

koje su prikrivene mutnoćom ili dimom

OCNL

Occasional

koje zauzimaju između 50% i 75%  označenog područja

OVC

Overcast

8 osmina neba pokriveno oblacima 

PL

Ice pellets

 

PO

Dust/Sand whirls

 

RA

Rain

 

RDOACT

Radioactive

 

SA

Sand

 

SC

Stratocumulus

 

SCT

Scattered

3-4 osmine neba pokriveno oblacima

SEV

Severe

 

SFC

Surface

 

SG

Snow grains

 

SN

Snow

 

SQ

Squall

 

SQL

Squall line

oluje poredane u liniji bez razmaka

SS

Sandstorm

 

ST

Stratus

 

STNR

Stationary

 

SS

Sand storm

 

TCU

Towering cumulus

 

TS

Thunderstorm

 

TURB

Turbulence

 

UTC

Co-ordinated Universal Time

 

VA

Volcanic ash

 

VAL

In valleys

 

VIS

Visibility

 

WKN

Weakening

 

XXX

Above FL100