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Noun

warning signal - an automatic signal (usually a sound) warning of danger

torpedo - a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead

signal, signaling, sign - any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"

air alert - the warning signal that begins a period of preparation for an enemy air attack

burglar alarm - a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away"

fire alarm - a shout or bell to warn that fire has broken out

foghorn, fogsignal - a loud low warning signal that can be heard by fogbound ships

horn - a noise made by the driver of an automobile to give warning;

red flag - a flag that serves as a warning signal; "we didn't swim at the beach because the red flag was up"

siren - a warning signal that is a loud wailing sound

alarm bell, tocsin - the sound of an alarm (usually a bell)

Mentioned in

References in classic literature

Tarzan did not repeat his warning signal, but instead rushed bodily upon the waiting Terkoz.

View in context

PAGASA was expected to raise tropical cyclone warning signal No.

Chedeng enters Philippines

The tropical cyclone warning signal earlier hoisted over 14 areas in Visayas and Mindanao has been lowered.

TS Basyang weakens to tropical depression

com) - January 21, 2019 - 11:53am MANILA, Philippines Tropical Cyclone Warning Signal No.

Signal No. 1 up in 7 areas as 'Amang' maintains strength

Pagasa noted that tropical cyclone warning Signal no.

Tropical Depression 'Usman' slows down - Pagasa

With this weather condition, Tropical Cyclone Warning signal No.

Storm 'Basyang' maintains strength, heads Eastern Mindanao

PAGASA said that tropical cyclone warning signal number one may be raised over Albay, including Burias Island,Romblon, Aklan, Capiz, northern section of Negros Occidental, and the northern section of Iloilo in the next severe weather bulletin.

Signal No. 1 up in 10 areas as 'Usman' keeps strength

Tropical Cyclone Warning Signal Number 1 is still up in 14 provinces in Luzon and Visayas.

TD 'Samuel' crossing Visayan Sea to Iloilo - Pagasa

The Coast Guard said that sea travel for ships are prohibited when a public storm warning signal is hoisted over specific areas.

'Urduja' strands 4,000 passengers in Eastern Visayas and Bicol

He said all types of vehicles would be barred from leaving port in areas that PAGASA placed under warning Signal #1.

Tropical Depression Usman slows down toward Eastern Visayas