June 12th Delivers Thundery Rain and Flash Flood Threat
Thursday, 12th June 2025 wakes to ominous skies as outbreaks of rain, embedded thunderstorms and flash flood potential sweep north across Ireland. The humid oppressive air carries maximums of 16–21°C, making this storm day feel heavier. Rain stubbornly lingers in Ulster into tonight even as southern counties clash with thunder and lightning mid-evening. This is not a weather warning—it’s a weather assault. Anyone in Leinster or Ulster should brace for chaos: road flooding, power spikes and hail are not off-limits. Prepare now.
National Forecast – Thursday, 12th June 2025
| Region | Daytime Conditions | Evening & Tonight | Highs (°C) | Winds |
|---|---|---|---|---|
| Dublin | Outbreaks of heavy rain and embedded thunderstorms moving north | Scattered showers/isolated thunderstorms under mist/fog overnight | 16–21 | Moderate southerly |
| Ulster | Persistent rain with embedded storms; heaviest of the day | Rain lingers, potential flooding, isolated thunder overnight | 16–21 | Moderate–fresh southerly |
| Connacht | Rain clearing southwards with showers and embedded storms later | Showers with isolated thundery pulses | 16–21 | Moderate southerly |
| Munster | Initially showers with embedded storms pushing north | Showers turning heavy and thundery, mist forming overnight | 16–21 | Moderate southerly |
| Leinster | Showers reluctantly replaced by thunderstorms mid-day | Persistent heavy showers and thunder; flash flood risk | 16–21 | Moderate southerly |
Tonight’s Summary
Thursday night remains humid under thick cloud, spot showers and scattered thunderstorms as far north as Ulster. Expect mist and fog patches early, temperatures stay stubbornly mild at 10–15°C, with moderate southerly winds maintaining the muggy atmosphere. Flash flood risk lingers in low-lying urban and rural areas.
Warnings & Risk Alerts
✔️ Status Yellow Thunderstorm Warnings in effect for Leinster, Tipperary, Waterford (00:00–14:00), and for Cavan, Donegal, Monaghan, Leitrim, Roscommon, Sligo (07:00–17:00).
✔️ A Yellow Thunderstorm Warning spans nearly all counties with embedded lightning, hail, gusts, and spot flooding risks lasting into Friday.
✔️ Small Craft Warning issued for Malin Head–Belfast Lough–Howth Head from 18:00 tonight to 01:00 Friday, expect Force 6 southeast winds.
✔️ Potato Blight Advisory remains active—farmers should monitor standing water closely.
Scientific Context & Forecast Drivers
Met Éireann meteorologists note a warm, humid airmass driven north by a shifted jet stream coupled with a low-pressure system to our west, creating perfect conditions for strong thunderstorms with hail, frequent lightning, large CAPE instability and wind shear. Ireland braces for multiple days of storms and power disruptions across the eastern half.
Regional Spotlight – Connacht
Connacht will experience showers turning increasingly heavy and potentially thundery through the day, with mist forming overnight and lows of 12–15°C under moderate southeasterly winds.
Extended Outlook
Friday begins with remaining showery bursts in the south/southwest before transitioning to scattered heavy afternoon showers and thunderstorms; highs of 17–21°C with southwest breezes. Saturday remains unstable: showery, humid and warm with more heavy bursts; Sunday should bring drier spells and recovery in sunshine before a return of occasional rain next week .
Critical Advice for Readers
Avoid low-lying roads this afternoon and tonight—flash flooding possible. Secure outdoor items; cover or remove them before winds gust. Farmers, act fast on drainage and crop protection—blight thrives in humidity. Boaters, heed marine warnings and stay ashore until tomorrow. Have emergency plans ready—phone batteries charged, grit for icy rain, alternative transport options mapped.
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