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ARG/
HAIL SURFACE AND ALOFT..1 3/4 INCHES. WIND
GUSTS..70 KNOTS. MAX TOPS TO 450. MEAN WIND
VECTOR 24045.
e) Soon after the AWW goes out, the actual watch
bulletin itself is issued. A WW is in the following
format:
1) Type of severe weather watch, watch area,
valid time period, type of severe weather possible,
watch axis, meaning of a watch, and a statement that
persons should be on the lookout for severe weather.
2) Other watch information; i.e., references to
previous watches.
3) Phenomena, intensities, hail size, wind speed
(knots), maximum cumulonimbus (CB) tops, and
estimated cell movement (mean wind vector).
4) Cause of severe weather.
5) Information on updating Convective Outlook
(AC) products.
EXAMPLEExample
of a WW:
BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 381
STORM PREDICTION CENTER NORMAN OK
556 PM CDT MON JUN 2 1997
THE STORM PREDICTON CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF NORTHEAST
NEW MEXICO TEXAS PANHANDLE
EFFECTIVE THIS MONDAY NIGHT AND TUESDAY
MORNING FROM 630 PM UNTIL MIDNIGHT CDT.
TORNADOES...HAIL TO 2 3/4 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE
IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE
FROM 50 MILES SOUTHWEST OF RATON NEW
MEXICO TO 50 MILES EAST OF AMARILLO TEXAS.
REMEMBER...A TORNADO WATCH MEANS CONDITIONS
ARE FAVORABLE FOR TORNADOES AND
SEVERE THUNDERSTORMS IN AND CLOSE TO THE
WATCH AREA. PERSONS IN THESE AREAS SHOULD
BE ON THE LOOKOUT FOR THREATENING WEATHER
CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...
WW378...WW 379...WW 380
DISCUSSION...THUNDERSTORMS ARE INCREASING
OVER NE NM IN MOIST SOUTHEASTERLY UPSLOPE
FLOW. OUTFLOW BOUNDARY EXTENDS EASTWARD
INTO THE TEXAS PANHANDLE AND EXPECT STORMS
TO MOVE ESE ALONG AND NORTH OF THE
BOUNDARY ON THE N EDGE OF THE CAP. VEERING
WINDS WITH HEIGHT ALONG WITH INCREASGING
30 AUG 07
AIP
United States of America
GEN 3.5-19
15 MAR 07
Federal Aviation Administration Nineteenth Edition
MID LVL FLOW INDICATE A THREAT FOR SUPERCELLS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS
WITH HAIL SURFACE AND ALOFT TO
23/4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 28025.
f) Status reports are issued as needed to show
progress of storms and to delineate areas no longer
under the threat of severe storm activity. Cancellation
bulletins are issued when it becomes evident that no
severe weather will develop or that storms have
subsided and are no longer severe.
g) When tornadoes or severe thunderstorms have
developed, the local WFO office will issue the
warnings covering those areas.
3.9.3.8 Center Weather Advisories (CWAs)
a) CWAs are unscheduled inflight, flow control,
air traffic, and air crew advisory. By nature of its short
lead time, the CWA is not a flight planning product.
It is generally a nowcast for conditions beginning
within the next two hours. CWAs will be issued:
1) As a supplement to an existing SIGMET,
Convective SIGMET or AIRMET.
2) When an Inflight Advisory has not been
issued but observed or expected weather conditions
meet SIGMET/AIRMET criteria based on current
pilot reports and reinforced by other sources of
information about existing meteorological conditions.
3) When observed or developing weather
conditions do not meet SIGMET, Convective
SIGMET, or AIRMET criteria; e.g., in terms of
intensity or area coverage, but current pilot reports or
other weather information sources indicate that
existing or anticipated meteorological phenomena
will adversely affect the safe flow of air traffic within
the ARTCC area of responsibility.
b) The following example is a CWA issued from
the Kansas City, Missouri, ARTCC. The “3” after
ZKC in the first line denotes this CWA has been
issued for the third weather phenomena to occur for
the day. The “301” in the second line denotes the
phenomena number again (3) and the issuance
number (01) for this phenomena. The CWA was
issued at 2140Z and is valid until 2340Z.
EXAMPLEZKC3
CWA 032140
ZKC CWA 301 VALID UNTIL 032340
ISOLD SVR TSTM over KCOU MOVG SWWD 10
KTS ETC.
4. Categorical Outlooks
4.1 Categorical outlook terms describing general
ceiling and visibility conditions for advance planning
　
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