BendixKing KAC 503 - Supplemental System FIS User Manual
Page 17
Rev 1 Oct. 2003
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SIGMETs are issued hourly and replace the previous hour’s product.
Each subsequent report issued for this same weather phenomenon
would increment the number. For example, 21C, 22C and so on.
6.
Area of coverage by state ND (North Dakota) and SD (South Dakota)
or geographic area. In addition to state abbreviations, other area abbre-
viations may be seen here, such as FL CSTL WTRS (Florida Coastal
Waters).
7.
Location of weather phenomenon (may be an area, single cell or line).
Three letter designators for navaids or airports are used to describe
boundaries of coverage.
The starting and ending point are identical for an area of thunder-
storms, like this: FROM 90W MOT-GFK-ABR-90W MOT (from 90 nm
west of Minot, ND to Grand Forks, ND to Aberdeen, SD to 90 nm west
of Minot, ND).
A Single Cell thunderstorm 35 nm west of Kansas City would look like
this: 35WMKC
A Line of severe thunderstorms would look like this: FROM 90SE SGF-
70NE TXK-50NE LFK (from 90 nm southeast of Springfield, MO to 70
nm northeast of Texarkana, AR to 50 nm northeast of Lufkin, TX).
8.
Details of weather phenomenon. Convective SIGMET details are
mostly in plain language with some abbreviations. This example is typ-
ical for an area of severe thunderstorms:
INTSFYG (intensifying) AREA (of) SVR TSTMS (severe thunder-
storms) MOVG (moving) FROM 2445 (240 degrees at 45 knots). Storm
TOPS ABV (above) FL450 (flight level 4-5-0). WIND GUSTS TO 60KT
(knots) RPRTD (reported). TORNADOES…HAIL TO 2 IN (inches in
diameter)…WIND GUSTS TO 65 KT (knots) PSBL (possible) in the ND
PTN (North Dakota portion).
For a single cell thunderstorm:
ISOLD (isolated) SVR TSTM (severe thunderstorm) D30 (30 nm in
diameter) MOVG (moving) FROM 2520 (250 degrees at 20 knots).
Storm TOPS ABV (above) FL450 (flight level 4-5-0). HAIL TO 2 IN
(inches in diameter) WIND GUSTS TO 65 KT (knots) PSBL (possible).
For a line of thunderstorms 25 nm wide:
LINE (line of) SVR TSTMS (severe thunderstorms) 25 MI WIDE MOVG
(moving) FROM 2745 (270 degrees at 45 knots). Storm TOPS ABV
(above) FL450 (flight level 4-5-0). WIND GUSTS TO 60KT (knots)
RPRTD (reported). TORNADOES…HAIL TO 2 IN (inches in
diameter)…WIND GUSTS TO 65 KT (knots) PSBL (possible).