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Strengthening low-level jet expected to increase storm coverage/intensity in Central Indiana between now and 9 p.m. from southwest-to-northeast. Remain Weather Aware with severe potential ending west-to-east between 11 pm - midnight. Updates on WTHR+:

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Christmas Eve and Christmas Day feature the most impressive severe thunderstorm setup I’ve seen along the California coastline in at least a decade. The first round of isolated severe thunderstorms will come ashore tonight, bringing the threat of a isolated tornado and severe wind gusts over 60 mph from the Central Coast up to Humboldt County. The severe weather threat then expands into the Central Valley during the afternoon, California’s tornado alley, with the potential for isolated tornadoes, damaging winds, and even large hail. The threat then shifts south into Southern California tomorrow, where isolated severe wind gusts and a brief tornado will be possible. However, Christmas Eve into Christmas morning features the most potent severe weather environment of the week and could lead to a severe thunderstorm outbreak along the coastline from the Central Coast up to the North Coast. The combination of strong low-level and deep-layer shear with sufficient instability is rarely seen in this part of the world. I seriously cannot recall seeing Significant Tornado Parameter (STP) values exceed 3 along the California coastline. The peak threat window appears to be from 10 PM Thursday to 8 AM Friday. It would not be out of the question to see a Severe Thunderstorm Watch issued Christmas Eve night with the potential for a couple tornadoes and scattered severe wind gusts. I also believe this may be the first time on record that San Francisco has been placed under a Marginal Risk for severe thunderstorms in the Day 1–3 NWS Storm Prediction Center Convective Outlooks.

Colin McCarthy

68,544 Aufrufe • vor 6 Monaten

Major Storm to Impact Southern California As of Wednesday, February 12, 2025, at 6:50 PM PDT, the latest infrared satellite imagery confirms that the incoming storm system is fully developed and on track to deliver severe weather across Northern and Central California tonight into early Thursday afternoon. The system is intensifying rapidly, with a powerful surface cold front expected to sweep through San Luis Obispo to San Diego counties, bringing damaging winds, torrential rainfall, and the potential for severe thunderstorms. Key Storm Impacts: "Big Thursday" – A Major Weather Event • Extreme Rainfall Rates – 0.50 to 1.5 inches per hour, increasing the risk of urban flooding, flash floods, and mudslides, particularly in burn scar areas of Los Angeles County. • Damaging Winds – Southerly gusts of 45-65 mph, capable of toppling trees, damaging weak structures, and causing widespread power outages. • Severe Thunderstorm & Weak Tornado Potential – The latest HRRR model data (18Z, 0Z) indicates the presence of a squall line, increasing the risk of isolated severe thunderstorms and weak tornadoes between 12 PM and 10 PM Thursday. • Scattered to Widespread power Outages – Areas at risk include the San Fernando Valley, Santa Clarita Valley, Ventura County, and portions of Los Angeles County, where infrastructure could be severely impacted. • Urban Flooding Concerns – Locations such as Downtown Los Angeles, Pasadena, Altadena, and Pacific Palisades will experience rapid runoff and potential roadway flooding, creating hazardous travel conditions. The Seriousness of the Situation This storm is shaping up to be one of the most intense weather events of the season, posing a significant threat to life and property. Residents in Los Angeles County and surrounding areas must prepare for prolonged heavy rainfall, high winds, possible power outages, and dangerous road conditions. Authorities urge residents to stay indoors, avoid unnecessary travel, and prepare emergency supplies. Those in flood-prone and burn scar areas should be especially vigilant for potential debris flows and flash flooding. This is a rapidly evolving situation and further updates in the next 24 to 30 hours. #CAwx #CaliforniaStorms

Jason D Farhang

30,044 Aufrufe • vor 1 Jahr

☀️12th April 2026: India Under the Dome: 6-Day Intense Dry Spell to Grip Subcontinent. The loan oasis, Northeast India Defies National Trend with Rain and Thunderstorms until 15th April. ​Mercury Surge: Central and South India Brace for 40°C+ as High Pressure Caps the Skies ​ Detailed Forecast & Analysis ​1. The Dominant "Heat Dome" Effect ​The orange and red anomalies in the loop represent positive geopotential height anomalies. This indicates a high-pressure system (anticyclone) at the 500mb level (approx. 5.5 km altitude). ​The Cause: This system acts like a "lid" or dome, trapping sinking air which warms up as it is compressed. This suppresses cloud formation and prevents moisture from the oceans from penetrating inland. ​Impact: Expect a rapid rise in maximum temperatures by 3–6°C across Northwest, Central, and East India. Example, cities like Delhi, Nagpur, and Ahmedabad are likely to approach or exceed the 40°C mark by April 15. ​2. Regional Breakdown Region Weather Outlook (Next 6 Days): Primary Driver Northwest & Central Severe dry heat; clear skies; rising heatwave risks. Strong anticyclonic subsidence. South Peninsular Hot and humid; minimal rainfall. High-pressure stability. East India Significant temperature spike (3–5°C rise). Expansion of the heat ridge eastward. Northeast India Scattered thunderstorms & light-to-moderate rain. Persistent 3. The Northeast Exception until 15th April. ​The red arrow in the loop image points to a specific area (Northeast India/Bangladesh border) where the high-pressure dome is weaker or interrupted. ​The Cause: A "trough" (an elongated area of low pressure) is expected to persist over this region. This allows moisture from the Bay of Bengal to interact with the hilly terrain, triggering Orographically induced thunderstorms. ​Expected Conditions: While the rest of India stays dry, states like Assam, Meghalaya, and Arunachal Pradesh will likely see fairly widespread rainfall and gusty winds 30–40 kmph through April 16. ​Preparation Advice ​Agriculture: Farmers in Central and West India should ensure adequate irrigation for summer crops as soil moisture will deplete rapidly. ​Health: High UV indices 9–10 are expected; avoid outdoor activity between 11 AM and 4 PM in heat-affected zones. ​Northeast Residents: Prepare for sudden squalls and lightning; ensure drainage systems are clear for localized heavy spells.

Parthan IN Weather

15,564 Aufrufe • vor 3 Monaten