2-70
Section 2
FIS Operation
Understanding Weather Reports
KMD 250 Pilot's Guide
Rev 4 Aug/2007
The described conditions follow this element.
20.
Low Level Windshear:
WS015/30045KT
WS
indicates “windshear” not associated with convective activity.
015
indicates the windshear is expected at 1500 feet. AGL Wind is
expected from 300° (
300
) at 45 knots (
45KT
).
21.
Change in Conditions:
PROB40 0407
PROB40
indicates a 40% “probability” of described conditions occur-
ring between 0400Z (
04
)and 0700Z (
07
). The described conditions
follow this element.
UNDERSTANDING PIREPS
The following is an example of a typical PIREP with an explanation of the
elements.
1.
Station Identifier:
KCRW
This is the station identifier of the nearest weather reporting location
to the reported conditions.
2.
Report Type:
UA
Reports will be routine (UA) or urgent (UUA).
3.
Location:
OV KBKW 360015-KCRW
OV
indicates the report is in relation to a VOR.
KBKW
is the VOR
identifier, in this case Beckley VOR.
360015-KCRW
indicates posi-
tion as related to the VOR. In this case,
15
miles out on the
360
degree radial.
KCRW
indicates this is a leg to the Charleston, West
Virginia VOR.
The next series of elements contain data that is read much like that in
METARs and TAFs. Each element starts with a 2-letter designator
which denotes the type of data with that element. The following defines
the element designators:
/TM
: Time as Coordinated Universal Time
/FL
: Altitude as Flight Level
/TP
: Aircraft Type
/SK
: Sky Cover (may include cloud height and coverage)
KCRW UA/OV KBKW 360015-KCRW/TM 1815/FL120/TP BE99/SK IMC/
WX RA/TA M08/WV 290030/TB LGT-MDT/IC LGT RIME/RM MDT MXD
ICG DURGC KROA NWBND FL080-100 1750Z
1
3
2
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