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greater than or equal to heavy precipitation affecting
40 percent or more of an area at least 3,000 square
miles.
2. Any convective SIGMET implies severe or
greater turbulence, severe icing, and low-level wind
shear. A convective SIGMET may be issued for any
convective situation that the forecaster feels is
hazardous to all categories of aircraft.
3. Convective SIGMET bulletins are issued for
the western (W), central (C), and eastern (E) United
States. (Convective SIGMETs are not issued for
Alaska or Hawaii.) The areas are separated at 87 and
107 degrees west longitude with sufficient overlap to
cover most cases when the phenomenon crosses the
boundaries. Bulletins are issued hourly at H+55.
Special bulletins are issued at any time as required
and updated at H+55. If no criteria meeting
convective SIGMET requirements are observed or
forecasted, the message “CONVECTIVE SIGMET...
NONE” will be issued for each area at H+55.
Individual convective SIGMETs for each area (W, C,
E) are numbered sequentially from number one each
day, beginning at 00Z. A convective SIGMET for a
continuing phenomenon will be reissued every hour
at H+55 with a new number. The text of the bulletin
consists of either an observation and a forecast or just
a forecast. The forecast is valid for up to 2 hours.
AIM 2/14/08
7-1-16 Meteorology
EXAMPLEExample
of a Convective SIGMET:
MKCC WST 251655
CONVECTIVE SIGMET 54C
VALID UNTIL 1855Z
WI IL
FROM 30E MSN-40ESE DBQ
DMSHG LINE TS 15 NM WIDE MOV FROM 30025KT.
TOPS TO FL450. WIND GUSTS TO 50 KT POSS.
CONVECTIVE SIGMET 55C
VALID UNTIL 1855Z
WI IA
FROM 30NNW MSN-30SSE MCW
DVLPG LINE TS 10 NM WIDE MOV FROM 30015KT.
TOPS TO FL300.
CONVECTIVE SIGMET 56C
VALID UNTIL 1855Z
MT ND SD MN IA MI
LINE TS 15 NM WIDE MOV FROM 27020KT. TOPS TO
FL380.
OUTLOOK VALID 151855-252255
FROM60NWISN-INL-TVC-SBN-BRL-FSDBIL-
60NW ISN
IR STLT IMGRY SHOWS CNVTV CLD TOP TEMPS
OVER SRN WI HAVE BEEN WARMING STEADILY
INDCG A WKNG TREND. THIS ALSO REFLECTED BY
LTST RADAR AND LTNG DATA. WKNG TREND OF
PRESENT LN MAY CONT...HWVR NEW DVLPMT IS
PSBL ALG OUTFLOW BDRY AND/OR OVR NE IA/SW
WI BHD CURRENT ACT.
A SCND TS IS CONTG TO MOV EWD THRU ERN MT
WITH NEW DVLPMT OCRG OVR CNTRL ND. MT ACT
IS MOVG TWD MORE FVRBL AMS OVR THE WRN
DAKS WHERE DWPTS ARE IN THE UPR 60S WITH
LIFTED INDEX VALUES TO MS 6. TS EXPD TO INCR IN
COVERAGE AND INTSTY DURG AFTN HRS.
WST ISSUANCES EXPD TO BE RQRD THRUT AFTN
HRS WITH INCRG PTNTL FOR STGR CELLS TO
CONTAIN LRG HAIL AND PSBLY DMGG SFC WNDS.
e. International SIGMET
1. Some NWS offices have been designated by
the ICAO as Meteorological Watch Offices (MWOs).
These offices are responsible for issuing International
SIGMETs for designated areas that include Alaska,
Hawaii, portions of the Atlantic and Pacific Oceans,
and the Gulf of Mexico.
2. The offices which issue International
SIGMETs are:
(a) The AWC in Kansas City, Missouri.
(b) The AAWU in Anchorage, Alaska.
(c) The WFO in Honolulu, Hawaii.
(d) The WFO on Guam Island in the Pacific
Ocean.
3. These SIGMETs are considered “widespread”
because they must be either affecting or be
forecasted to affect an area of at least 3,000 square
miles at any one time. The International SIGMET is
issued for 12 hours for volcanic ash events, 6 hours
for hurricanes and tropical storms, and 4 hours for all
other events. Like the domestic SIGMETs, International
SIGMETs are also identified by an alphabetic
designator from Alpha through Mike and are
numbered sequentially until that weather phenomenon
ends. The criteria for an International SIGMET
are:
(a) Thunderstorms occurring in lines, embedded
in clouds, or in large areas producing
tornadoes or large hail.
(b) Tropical cyclones.
(c) Severe icing.
(d) Severe or extreme turbulence.
(e) Dust storms and sandstorms lowering
visibilities to less than 3 miles.
(f) Volcanic ash.
EXAMPLEExample
of an International SIGMET:
WSNT06 KKCI 022014
SIGA0F
KZMA KZNY TJZS SIGMET FOXTROT 3 VALID
022015/030015 KKCI- MIAMI OCEANIC FIR NEW
YORK OCEANIC FIR SAN JUAN FIR FRQ TS WI AREA
BOUNDED BY 2711N6807W 2156N6654W 2220N7040W
2602N7208W 2711N6807W. TOPS TO FL470. MOV NE
15KT. WKN. BASED ON SAT AND LTG OBS.
MOSHER
f. AIRMET (WA)
1. AIRMETs (WAs) are advisories of significant
weather phenomena but describe conditions at
intensities lower than those which require the
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