What is a ‘bomb cyclone’? Meteorologists explain

(19 Nov 2024)
RESTRICTION SUMMARY:

ASSOCIATED PRESS
ARCHIVE: Aptos, California – 6 January 2023
1. Truck drives through standing water in street

ASSOCIATED PRESS
Caribou, Maine – 19 November 2024
++PARTIALLY COVERED BY SHOTS 1 and 3++
2.SOUNDBITE (English) Louise Fode, Warning Coordination Meteorologist, National Weather Service:
"A bomb cyclone – We have a technical definition for it. And that’s when a low pressure system rapidly intensifies by 24 millibars in 24 hours – Really what we’re describing is a low pressure system or a storm that’s going under rapid intensification.""

ASSOCIATED PRESS
ARCHIVE: Aptos, California – 6 January 2023
3. Woman shovels mud and water out of store

ASSOCIATED PRESS
Caribou, Maine – 19 November 2024
++PARTIALLY COVERED BY SHOT 4++
4. SOUNDBITE (English) Louise Fode, Warning Coordination Meteorologist, National Weather Service:
"There’s a number of factors that are involved with any storm system to make it a bomb cyclone. But really, the most frequent thing that we see is when we have some stronger cold air being pulled into a warmer system. "

ASSOCIATED PRESS
ARCHIVE: Aptos, California – 6 January 2023
5. Various people looking at logs and debris on beach

ASSOCIATED PRESS
College Park, Maryland – 19 November 2024
++PARTIALLY COVERED BY SHOT 5 and 7++
6. SOUNDBITE (English) Allison Santorelli, Meteorologist, NOAA/National Weather Service:
"Usually they’re going to be associated with a lot of weather, you know, heavy rainfall, heavy snowfall and certainly high gusty winds, possibly up to up to hurricane strength winds. I mean, we’re seeing wind gusts near the coast or off the coast of the Pacific Northwest right now up in the 90 mile per hour wind gusts. And they are expecting high wind gusts, especially in some of the higher terrain further inland as well."

ASSOCIATED PRESS
ARCHIVE: Aptos, California – 6 January 2023
7. Various people looking at logs and debris on beach
8. Woman walks through flooded street

ASSOCIATED PRESS
College Park, Maryland – 19 November 2024
++FULLY COVERED BY SHOTS 8 AND 10++
9. SOUNDBITE (English) Allison Santorelli, Meteorologist, NOAA/National Weather Service:
"it’s going to bring some significant precipitation to portions of northern California. We’re talking rainfall totals, 10 to 20 inches possible with feet of snow, several feet of snow in the highest terrain. This is going to result in likely to result in significant flash flooding and landslides."

ASSOCIATED PRESS
ARCHIVE: Capitola, California – 6 January 2023
10. Various storm damage
STORYLINE:
A powerful storm is bearing down on the West Coast and bringing with it a scary-sounding weather term – bomb cyclone.

Bomb cyclone is a term used by weather enthusiasts to describe a process that meteorologists usually call bombogenesis. It’s the rapid intensification of a cyclone in a short period of time, and it can happen during powerful storms such as the one northern California and the Pacific Northwest are preparing for this week.

A bomb cyclone occurs during the rapid intensification of a cyclone located between the tropics and the polar regions, according to the National Oceanic and Atmospheric Administration. It can happen when a cold air mass collides with a warm air mass, which is something that can occur over ocean waters, the agency says.

The Weather Prediction Center said the storm intensified swiftly enough that it’s considered a bomb cyclone.

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