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Flashcards in Aviation Weather Services Deck (145):
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Trace Icing

Ice becomes perceptible. Rate of accumulation is slightly greater than sublimation. Deicing equipment is not required unless encountered for extended period of time

1

Light icing

Rate of accumulation may create a problem if flight is prolonged for over 1 hour

2

Severe icing

Rate if accumulation is such that deicing equipment fails to reduce or control the hazard

3

Moderate icing

Rate if accumulation is such that short encounters become potentially hazardous

4

Define METAR

Aviation Routine Weather Report 3.1.1

4

Define TIBS

Telephone Information Briefing Service 1.3.4

4

What is TIBS

Continuous telephone recording if meteorological and aeronautical information. Used as a preliminary briefing tool 1.3.4

4

What is HIWAS

Hazardous Inflight Weather Advisory Service Broadcast hazardous weather information continuously over selected NAVIDS 1.3.5

4

Define EFAS

En Route Flight Advisory Service Flight Watch 1.3.6

5

What frequency is Flight Watch?

122.0 Below FL180 1.3.6

6

What is a primary weather product?

A weather product that meets all the regulatory requirements and safety needs for use in making weather related flight decisions 2.1.1

7

What is a supplemental weather product?

A weather product is an aviation weather product that may be used for enhanced situational awareness 2.1.2

8

HIWAS Service Volume

150nm 1.3.5

9

Between what hours may TIBS have reduced operations?

1800-0600 1.3.4

10

Define SPECI

Aviation Selected Special Weather Report 3.1.2

11

What are the wind shift requirements for the issuance of a SPECI?

45 degrees Less than 15 minutes Wind speed greater than 10kts Table 3-1

12

For a SPECI to be issued the visibility must drop below or increase to what value

3 sm 2 sm 1 sm Below the minimums of the lowest IAP 1/2 sm Table 3-1

13

A SPECI will be issued when a tornado....

Is observed Disappears or ends Table 3-1

14

A SPECI will be issued for a thunderstorm when...

Begins, not if one is currently reported Ends Table 3-1

15

A SPECI will be issued for precip when

Hail begins or ends Freezing precipitation begins, ends, or changes intensity Ice pellets begin, end, or change intensity Table 3-1

16

For a SPECI to be issued the ceiling must drop below or increase to what value...

3,000' 1,500' 1,000' 500' Lowest IAP 200' Table 3-1

17

Will an aircraft mishap result in a SPECI?

Yes Table 3-1

18

AUTO

Fully automated report with no human intervention or oversight 3.1.3.4

19

COR

Corrected METAR or SPECI 3.1.3.4

20

Wind gust

Rapid fluctuations in wind speed 10kts or more between peaks and lulls 3.1.3.5.1

21

Wind speed is determined how

Averaging the speed over a 2-minute period 3.1.3.5

22

VRB

Variable Wind speed was 6kts or less

23

00000kts

Calm winds 3.1.3.5.4

24

- METAR

Light Table 3-2

25

+ in METAR

Heavy Table 3-2

26

MI

Shallow Table 3-2

27

PR

Partial Table 3-2

28

V in wind group

Wind varies by 60 degrees or more Wind speed more than 6kts 3.1.3.5.3

29

BC

Patches Table 3-2

30

DR

Low drifting Table 3-2

31

BL

Blowing Table 3-2

32

SH

Showers Table 3-2

33

TS

Thunderstorms Table 3-2

34

FZ

Freezing Table 3-2

35

DZ

Drizzle Table 3-2

36

RA

Rain Table 3-2

37

SN

Snow Table 3-2

38

SG

Snow Grains Table 3-2

39

IC

Ice Crystals Table 3-2

40

PL

Ice Pellets Table 3-2

41

GR

Hail Table 3-2

42

GS

Small Hail Table 3-2

43

UP

Unknown Precipitation Table 3-2

44

BR

Mist Table 3-2

45

FG

Fog Table 3-2

46

FU

Smoke Table 3-2

47

VA

Volcanic Ash Table 3-2

48

DU

Widespread dust Table 3-2

49

SA

Sand Table 3-2

50

HZ

Haze Table 3-2

51

PY

Spray Table 3-2

52

PO

Dust/sand whirls Table 3-2

53

SQ

Squalls Table 3-2

54

FC

Funnel cloud Tornado Water spout Table 3-2

55

SS

Sandstorm Table 3-2

56

DS

Dust storm Table 3-2

57

Vicinity

5-10 sm 3.1.3.8.2

58

When will an obscuration be coded in a METAR

When surface visibility is below 7 miles 3.1.3.8.5

59

When will UP be reported

When an automatic station detects the occurrence of precipitation but the sensor cannot recognize the type 3.1.3.8.4

60

VV

Vertical visibility 8/8 coverage Table 3-3

61

SKC

Clear Used at manual stations when no layers are reported Table 3-3

62

CLR

Clear below 12,000 Automated stations only

63

FEW

Few 1/8-2/8 coverage Table 3-3

64

SCT

Scattered 3/8-4/8 coverage Table 3-3

65

BKN

Broken 5/8-7/8 coverage Table 3-3

66

OVC

Overcast 8/8 coverage

67

Define ceiling

The lowest layer aloft reported as broken or overcast 3.1.3.9

68

CB

Cumulonimbus clouds 3.1.3.9

69

TCU

Tower cumulus 3.1.3.9

70

Define Dew Point

Temperature to which a given parcel of air must be cooled for the air to become fully saturated 3.1.3.10

71

RMK

Remarks 3.1.3.12

72

DSNT

Distant Beyond 10nm Less than 30nm 3.1.3.12

73

Distant remarks are in _____ miles except lighting remarks which are in ______ miles

Statue miles Nautical miles 3.1.3.12

74

AO1

Automated station without a precipitation discriminator 3.1.3.13.3

75

AO2

Automated station with a precipitation discriminator 3.1.3.13.3

76

FROPA

Frontal passage 3.1.3.13.5

77

OCNL lighting

Occasional Less than 1 flash/minute Table 3-6

78

FRQ lighting

Frequent About 1-6 flashes per minute Table 3-6

79

CONS lightning

Continuous More than 6 flashes per minute

80

B or E in METAR remarks

Beginning or ending of weather phenomenon 3.1.3.13.12

81

CBMAM

Cumulonimbus mammatus 3.1.3.13.19.1

82

ACC in METAR

Altocumulus Castellanus 3.1.3.13.19.3

83

SCSL, ACSL, CCSL

Stratocumulus Altocumulus Cirrocumulus 3.1.3.13.19.4

84

PRESRR PRESFR

Pressure rising rapidly Pressure falling rapidly 3.1.3.13.21

85

SNINCR

Snow increasing rapidly First number indicates snow in last hour Second number indicates total snow fall 3.1.3.13.25

86

RVRNO

Runway visual range is missing 3.1.3.14.2.1

87

PWINO

Present weather identifier and the sensor is not operating 3.1.3.14.2.1

88

PNO

Tipping bucket rain gauge and sensor is not operating 3.1.3.14.2.1

89

FZRANO

Freezing rain sensor is not operating 3.1.3.14.2.1

90

TSNO

Lighting detector is not operating 3.1.3.14.2.1

91

VISNO LOC

Secondary visibility sensor not operating 3.1.3.14.2.1

92

CHINO LOC

Secondary ceiling height indicator is not operating 3.1.3.14.2.1

98

$

Maintenance is needed on the system 3.1.3.14.2.2

99

Eroute controllers advise pilots of hazardous weather that may impact operations within ____ of the controller's sector

150nm 1.2.2

100

ATCR and TRACONs may opt to broadcast hazardous weather only when part of the area described is within ______

50nm 1.2.3

101

An outlook briefing should be requested when a planned departure is how far out?

6 or more hours 1.3.1.3

102

PATWAS

Pilot's automatic telephone weather answering service Appendix B

103

TIBS service hours

24 hrs a day 1.3.4

104

How large of a radius do area briefings cover?

50nm 1.3.4

105

How often is TIBS updated?

As conditions change 1.3.4

106

Where can you find TIBS phone numbers?

AF/D 1.3.4

107

METAR wind True or Magnetic

True 3.1.3.5

108

Prevailing visibility

The greatest distance that can be seen throughout at least half of the horizon circle, not necessarily continuous. 3.1.3.6

109

M1/4SM

Less than 1/4sm visibility 3.1.3.6

110

Manual RVR is not reported below:

600' 3.1.3.7

111

RVR is reported when?

When prevailing visibility is 1sm or less 3.1.3.7

112

Automated stations may report RVR for up to ______ runways

4 3.1.3.7

113

V in RVR report

Variable conditions Included when varies by more than one reportable value

114

Intensity qualifiers are not included with what precipitation phenomena

Ice crystals Hail Blowing dust Blowing Sand Blowing Snow 3.1.3.8.1

115

Are intensity qualifiers included with VC

No 3.1.3.8.2

116

Shallow

The visibility at 6 feet above ground level is greater than or equal to 5/8 SM and the apparent visibility in the fog layer is less than 5/8 SM Table 7-5

117

Patches

Fog patches covering part of the airport. The apparent visibility in the fog patch or bank is less than 5/8 SM, with the foggy patches extending to at least 6 feet above ground level. Table 7-5

118

Maximum number of types of precipitation that may be coded in single group

3 3.1.3.8.4

119

Obscuration

Any phenomenon in the atmosphere other than precipitation reducing visibility 3.1.3.8.5

120

Precipitation

Any of the forms of water particles, whether liquid or solid that falls from the atmosphere and reaches the ground. 3.1.3.8.4

121

How often are Surface Analysis Charts issued?

Every 3 hours

122

How often are Radar Summary charts issued

Hourly

123

What are the three types of configurations within radar summary reports?

Cell LN Area

124

Cell in radar summary report

Single isolated convective echo

125

LN in radar summary report

Echo that: Contains heavy precip Is 30 miles long 4 times longer than width 25% coverage

126

Area in radar summary report

Groups of echoes of similar type not in a line

127

How is coverage denoted in a radar summary report?

Single digit preceding precip type that represents in tenths of coverage

128

R in radar summary report

Rain

129

RW in radar summary report

Rain Shower

130

S in radar summary report

Snow

131

SW in radar summary report

Snow shower

132

T in radar summary report

Thunderstorm

133

- in radar summary report

Light precip

134

+ in radar summary report

Heavy precip

135

++ in radar summary report

Heavy precip

136

X in radar summary report

Extreme precip

137

XX

Extreme precip

138

How is location denoted on a radar summary report?

Two end points denoted by radial and distance and a width followed by the letter W

139

MT in radar summary report

Radar data alone

140

MTS on radar summary report

Satellite and radar data used

141

How is max top denoted on radar summary report?

Three digit number in hundreds of feet with azimuth and range denoting location

142

U in radar summary report altitude section

Echo tops are uniform in height

143

How is cell movement denoted in radar summary report?

4 digit number preceded by letter C First two are direction in true north Second two are speed in knots

144

When will wind be reported in the area forecast?

Surface wind sustained at 20kts or greater Surface gusts are 25kts or greater 7.1.6

145

When will weather phenomenon be included in an area forecast?

If it results in visibilities of 3-5 statue miles 7.1.6