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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
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KMD 250 FIS_R4 8/13/07 10:07 AM Page 2-70