91³Ô¹ÏÍø

Watch CBS News
Weather

What is a bomb cyclone, and will it bring Philadelphia snow this weekend?

By Tammie Souza, Grant Gilmore

/ CBS Philadelphia

This weekend, a powerful winter storm known as a bomb cyclone will develop off the South Carolina coast and travel north along the East Coast. It will deliver heavy snow for the Carolina and Virginia coastlines. 

After that, the storm will either turn farther out to sea, just clipping the Jersey Shore, Delaware beaches, and South Jersey with snow, or it will track closer to the Shore, bringing heavy snow to South Jersey, the Jersey Shore, Delaware and possibly Philadelphia. 

The two long-range models, GFS (the American) and ECMWF (the European), have been bouncing back and forth with these two tracks. A final track will become clearer by Saturday morning.  

Even if the storm stays farther offshore, strong winds will be possible over the weekend.

What is a bomb cyclone? 

Every year, a handful of fall and winter storms undergo what is known as bombogenesis, becoming bomb cyclones. 

These storms begin as minor or average storms and then go through a rapid, explosive intensification, delivering heavy snow, blizzards, thundersnow, coastal flooding and flooding rains.

Their impacts include widespread power outages, coastal erosion, tree damage, and structural damage due to near hurricane force winds that reach 74 mph, and lead to the nickname "Winter Hurricane."

Ingredients for bombogenesis include:

  • A non-tropical cyclone (winter storm)
  • A clash between an Arctic air mass and a warmer and moist ocean air mass
  • A rapid, enormous drop in the storm's central pressure of 24 mb or more in a 24-hour period

Bomb cyclones are possible year-round, but they are most common along the eastern seaboard of the United States during winter and early spring. Extreme nor'easters are usually bomb cyclones.

In:

© 2026 CBS Broadcasting Inc. All Rights Reserved.

View CBS News In
CBS News App Open
Chrome Safari Continue
const link = doc.createElement('link'); link.rel = 'stylesheet'; link.href = '/fly/fly/bundles/cbsnewscontent/css/cmp-banner.min.css?v=50747257b890e014813016b79ece0fb2'; doc.head.appendChild(link); doc.body.innerHTML = CONSENT_MESSAGE; } else { el.insertAdjacentHTML('afterend', CONSENT_MESSAGE); } }); } function hidePrivacyMessage() { // Remove from the main document document.querySelectorAll(`.${CONSENT_MESSAGE_CLASS}`).forEach(el => el.remove()); // Remove from inside any iframes document.querySelectorAll('iframe').forEach(iframe => { const doc = iframe.contentDocument || iframe.contentWindow.document; doc.querySelectorAll(`.${CONSENT_MESSAGE_CLASS}`).forEach(el => el.remove()); }); } function activateGatedScripts() { // Handle both new format (cmp-gated-script) and old OneTrust/Ketch format (optanon-category-4) const gatedScripts = Array.from(document.querySelectorAll('script.cmp-gated-script, script.optanon-category-4')); // Activate scripts sequentially with a small delay to avoid timing issues let delay = 0; gatedScripts.forEach(function(placeholder, index) { setTimeout(function() { // Skip if already processed if (placeholder.hasAttribute('data-cmp-processed')) { return; } placeholder.setAttribute('data-cmp-processed', 'true'); const newScript = document.createElement('script'); newScript.type = 'text/javascript'; // Try new format first (data-cmp-src), then fall back to old format (data-src) const src = placeholder.getAttribute('data-cmp-src') || placeholder.getAttribute('data-src'); if (src) { newScript.src = src; } else if (placeholder.textContent) { // Inline script - just copy the content newScript.textContent = placeholder.textContent; } // Handle new format attributes (data-cmp-attrs) - for both inline and external scripts const attrs = placeholder.getAttribute('data-cmp-attrs'); if (attrs) { const tempDiv = document.createElement('div'); tempDiv.innerHTML = '
<\/div>'; const tempAttrs = tempDiv.firstChild.attributes; for (let i = 0; i < tempAttrs.length; i++) { // For external scripts, allow defer/async. For inline scripts, skip them (not valid) if (src || (tempAttrs[i].name !== 'async' && tempAttrs[i].name !== 'defer')) { newScript.setAttribute(tempAttrs[i].name, tempAttrs[i].value); } } } // Copy other attributes from old OneTrust format for (let i = 0; i < placeholder.attributes.length; i++) { const attr = placeholder.attributes[i]; // Skip attributes we've already handled or don't want to copy if (!['class', 'data-src', 'data-type', 'data-cmp-src', 'data-cmp-attrs', 'data-cmp-processed', 'type', 'async', 'defer', 'src'].includes(attr.name)) { newScript.setAttribute(attr.name, attr.value); } } placeholder.parentNode.replaceChild(newScript, placeholder); // If external script, manually trigger window.onload handlers after it loads // This handles widgets that use window.onload for initialization if (src) { newScript.addEventListener('load', function() { // If page already loaded and script set a new onload handler, trigger it if (document.readyState === 'complete' && window.onload) { const originalOnload = window.onload; window.onload = null; // Clear temporarily to prevent loops originalOnload(); // Execute the handler } }); } }, delay); delay += 500; // 500ms delay between each script to allow full loading }); } cbsoptanon.onScriptsReady(function(cmp) { cmp.ot.targetingAllowed(function(allowed) { if (!allowed) { showPrivacyMessage(); } else { activateGatedScripts(); } }); cmp.ot.awaitInitialConsent(function(consent_model) { cmp.ot.addOnConsentChangedHandler(function() { cmp.ot.targetingAllowed(function(allowed) { if (allowed) { hidePrivacyMessage(); activateGatedScripts(); } else { showPrivacyMessage(); } }); }); }); });