When NOAA issues a convective SIGMET, it falls under one of three bulletin IDs: WSUS31, WSUS32, or WSUS33. Below are three examples from the current forecast.
WSUS31:
WSUS31 KKCI 020455
SIGE
CONVECTIVE SIGMET 24E
VALID UNTIL 0655Z
PA
FROM 30NNW JST-20SE EWC
LINE TS 25 NM WIDE MOV FROM 24025KT. TOPS TO FL340.
OUTLOOK VALID 020655-021055
AREA 1...FROM 130SSE ILM-210ENE TRV-TRV-SAV-130SSE ILM
WST ISSUANCES POSS LT IN PD. REFER TO MOST RECENT ACUS01 KWNS
FROM STORM
PREDICTION CENTER FOR SYNOPSIS AND METEOROLOGICAL DETAILS.
AREA 2...FROM 70NNE
ASP-ECK-DXO-CLE-BUF-SYR-BKW-VXV-MSL-TTH-TVC-70NNE ASP
WST ISSUANCES POSS. REFER TO MOST RECENT ACUS01 KWNS FROM STORM
PREDICTION CENTER FOR SYNOPSIS AND METEOROLOGICAL DETAILS.
WSUS32:
WSUS32 KKCI 020455
SIGC
CONVECTIVE SIGMET 30C
VALID UNTIL 0655Z
MI WI LS
FROM 30SSE YQT-40SSE DLH
LINE TS 30 NM WIDE MOV FROM 27050KT. TOPS TO FL310.
OUTLOOK VALID 020655-021055
FROM TTH-MSL-ELD-LFK-DLF-TCC-GCK-RZC-TTH
WST ISSUANCES EXPD. REFER TO MOST RECENT ACUS01 KWNS FROM STORM
PREDICTION CENTER FOR SYNOPSIS AND METEOROLOGICAL DETAILS.
WSUS33:
WSUS33 KKCI 020455
SIGW
CONVECTIVE SIGMET...NONE
OUTLOOK VALID 020655-021055
TS ARE NOT EXPD TO REQUIRE WST ISSUANCES.