Need a fast source comparison first? The lightning forecast near me guide separates NWS and SPC forecasting from recent lightning detections.
Where to Check Tonight's Thunderstorm Risk
- Local NWS point forecast (forecast.weather.gov) — hourly grid forecast plus the "Tonight" and "Late Tonight" narrative sections.
- SPC day-1 outlook (spc.noaa.gov) — categorical severe-storm risk map covering the next 24 hours.
- SPC mesoscale discussions — short-term commentary on developing convection. Updated every few hours by SPC forecasters.
- Live lightning map — confirm whether overnight storms have arrived. Browse our all 50 state lightning maps.
Why Tonight's Storms Behave Differently
Nighttime convection has different drivers than afternoon storms:
- Surface cools after sunset, so daytime instability decreases. Most isolated afternoon cells dissipate by mid-evening.
- Low-level jet strengthens after dark in the Plains and Midwest, transporting Gulf moisture and creating fresh instability aloft. This drives the well-known Plains nocturnal maximum.
- Mesoscale convective systems (MCSs) — large clusters of thunderstorms, often form in the evening and persist through the night, producing widespread lightning and heavy rain across multiple states.
- Warning lead time is shorter when people are asleep, which is why nocturnal tornadoes are statistically more deadly.
Regions Most Likely to See Overnight Storms
- Oklahoma + Kansas + Nebraska + Iowa — May to August nocturnal MCSs are climatological.
- Mid-Mississippi Valley (MO, AR, TN) — overnight squall lines are common in spring and early summer.
- Gulf Coast (LA, MS, AL, FL Panhandle) — overnight tropical convection year-round, peaking in summer.
How to Monitor Lightning While You Sleep
- NOAA Weather Radio with SAME alerts — wakes you for county-level severe-thunderstorm and tornado warnings issued by your local NWS office. Battery backup recommended.
- Phone push notifications — both iOS Wireless Emergency Alerts (WEA) and dedicated apps like Lightning Tracker can wake the device when severe criteria are met or when a flash is detected within your alert radius. Make sure ringer/notifications are not on full silent overnight.
- Bedside backup — a flashlight + shoes by the bed in case you need to move quickly to a sheltered interior room (basement, bathroom, hallway away from windows).
Overnight Lightning Safety
The 30-30 rule still applies at night: if thunder is audible within 30 seconds of a flash (about 6 miles), the storm is close enough to require shelter. At night you are probably already inside, so the real risk is waking up without realising the storm is severe. NOAA Weather Radio + a phone alert app together cover the gap.
See indoor lightning safety for what to avoid (corded phones, plumbing, plugged-in electronics) once a storm reaches your location.