This is a live Monday afternoon snapshot of local storm-type events across the United States as of Monday, September 14, 2026. The Storm Prediction Center 2000 UTC Day 1 Convective Outlook holds a Slight Risk of severe thunderstorms across northern Kansas and southern and eastern Nebraska into western and central Iowa. Severe Thunderstorm Watch 668, issued at 3:45 p.m. CDT, covers western and northern Kansas and south-central Nebraska until 10:00 p.m. CDT. The Weather Prediction Center Day 1 Excessive Rainfall Outlook, valid 12 UTC Monday through 12 UTC Tuesday, keeps a Moderate Risk over portions of central and southwestern Iowa.
These are county-scale thunderstorms and flash-flood pulses, not a U.S. mainland hurricane landfall. Restoration exposure tonight is wind-driven roof and tree work in the watch, isolated hail, a conditional tornado in the eastern Nebraska–western Iowa corridor if a surface-based supercell holds, and interior water where Iowa cells train. Conditions change fast. Verify with the National Weather Service for the specific county or ZIP before you roll.
What is live this afternoon
Watch 668 is the organized wind desk. SPC issued it at 3:45 p.m. CDT Monday, September 14, 2026, for portions of western and northern Kansas and south-central Nebraska, effective until 10:00 p.m. CDT. Primary threat language is scattered damaging winds and isolated significant gusts to 80 mph, plus isolated large hail to 1.5 inches. High-based storms are expected to continue in a hot, well-mixed environment and spread northeast near a pre-frontal trough.
The 2000 UTC Day 1 outlook, issued 3:00 p.m. CDT by Karstens and Wendt, did not change the categorical Slight Risk. Summary language: scattered strong to severe thunderstorms should occur across parts of eastern Nebraska into western and central Iowa this afternoon and evening. Large hail, severe wind gusts, and tornadoes all appear possible. Severe thunderstorm winds will also be possible across northern and western Kansas. An 18z Omaha sounding showed about 2,232 J/kg MUCAPE as destablization spread north into central and eastern Nebraska. SPC still expects an elongated area of convection from north-central Kansas into south-central and eastern Nebraska and west-central Iowa, favoring supercells early, then a quick transition to clusters and line segments. Exact initiation remains uncertain in recent HRRR and RRFS runs. No SPC mesoscale discussion was in effect as of mid-afternoon UTC; Watch 668 is the current watch product.
WPC’s Day 1 excessive-rainfall discussion, issued 3:40 a.m. EDT Monday, September 14, 2026, maintains a Moderate Risk over portions of central and southwestern Iowa, coordinated with the Des Moines forecast office. HREF blended-mean QPF of 3–5 inches is cited near Des Moines and points south and southwest, with neighborhood probabilities of 60–80 percent for more than 3 inches and 3-hour flash-flood-guidance exceedance probabilities of 50–70 percent. A broad Slight Risk still covers much of the Midwest from the Door Peninsula through eastern Nebraska, plus a separate Slight Risk over the Southwest west of the I-25 corridor.
Hotspot 1 — Eastern Nebraska into western and central Iowa
This is the Slight Risk core. SPC places 5 percent tornado probabilities over parts of eastern Nebraska near Omaha, Lincoln, Council Bluffs, Bellevue, and Fremont, with 2 percent tornado probabilities extending toward Des Moines, Sioux City, Ames, West Des Moines, and Ankeny. Fifteen-percent wind and hail contours overlap the Omaha–Lincoln–Council Bluffs corridor. A 40–50 kt nocturnal low-level jet is forecast to increase effective storm-relative helicity this evening. SPC notes lingering low-level inhibition on RAP soundings and says it remains unclear whether convection will fully tap that shear. A sustained surface-based supercell in that environment would conditionally be capable of a strong tornado. Weak instability farther east in eastern Iowa should limit the severe risk deeper into the night.
Cities and counties to watch: Omaha, Lincoln, Bellevue, Fremont, and Council Bluffs; Sioux City, Fort Dodge, Ames, Des Moines, West Des Moines, and Ankeny; counties along and just ahead of the cold front from southeast Nebraska into west-central Iowa.
Restoration read: wind and hail first if supercells hold, then water if the same cells train on the WPC Moderate footprint. Stage tarps, generators, and extraction pumps before dark. Treat a tornado warning as a narrow local survey, not a regional event.
Hotspot 2 — Watch 668: western and northern Kansas, south-central Nebraska
The watch box runs roughly 45 miles north and south of a line from 145 miles southwest of Hill City, Kansas, to 50 miles east of Hastings, Nebraska. That is high-based, mixed-layer convection along the pre-frontal trough, not the same supercell corridor as Omaha. Primary threats are damaging wind, isolated 80 mph gusts, and hail to about 1.5 inches through 10:00 p.m. CDT.
Cities and counties to watch: Hill City, Hays, and northern Kansas counties in the watch outline; Hastings, Grand Island, and south-central Nebraska counties in and near the box. Confirm the county list on the Watch 668 outline update at SPC before you pre-position.
Restoration read: dry-microburst and outflow wind on roofs, siding, and center-pivot country. Photograph in remaining daylight only if it is safe. Hail claims will be isolated, not a swath unless a cell stays surface-based longer than expected.
Hotspot 3 — Central and southwestern Iowa flood Moderate, plus Southwest rain
The flood desk is Iowa. WPC introduced a small Moderate Risk for this Day 1 period because CAM guidance clustered 3–6 inch totals south of I-80, with urban streets and low-water crossings the first failures. A broader Slight Risk still covers eastern Nebraska through much of the Midwest. Expectation is scattered flash flooding tonight into early Tuesday morning.
The Southwest Slight Risk covers eastern Arizona, much of New Mexico west of I-25, and southwestern Colorado. PWATs are cited near the 95th–99th percentile. That is monsoon-style heavy rain on complex terrain and remnant burn scars, plus strong outflow, not the Plains watch.
Restoration read: Iowa is water and a 24–48 hour mold clock if 3-inch cores verify in town. The Southwest is localized washouts and urban flooding, not a CAT roster.
Just hit
SPC storm reports for the 12 UTC Monday, September 14, 2026 through 12 UTC Tuesday window showed no tornado, hail, or wind LSRs at the time of this afternoon desk. That is a quiet start to the convective day, not a forecast of a quiet evening. Last night’s 12 UTC Sunday–Monday window still holds the tickets already on the board: tree and wire work across Ohio, Pennsylvania, New York, and West Virginia from Sunday’s upper Ohio Valley–Northeast line; a roof peeled in Fox Township, Carroll County, Ohio; microburst-style trees and minor roof damage near Cloverport, Hardeman County, Tennessee; 1.00-inch hail near Sterling, Johnson County, Nebraska, and in Cascade and Judith Basin counties, Montana; a 61 mph gust near Patagonia, Arizona.
Sunday’s organized wind corridor is yesterday. Today’s new work, if it verifies, is Watch 668 and the eastern Nebraska–Iowa Slight Risk plus Iowa flash flooding.
Pulse table
| Region | Main threats | SPC / NWS level | Status this afternoon |
|---|---|---|---|
| Eastern NE / western–central IA | Hail, damaging wind, conditional tornado | SPC Slight (2000 UTC) | Live Slight; initiation still uncertain |
| Western / northern KS, south-central NE | Damaging wind to 80 mph, hail to 1.5 in | Watch 668 to 10 p.m. CDT | Live watch |
| Central / southwestern Iowa | Flash flood, 3–6 in cores possible | WPC Moderate excessive rainfall | Tonight into Tuesday morning |
| Midwest Slight (Door Peninsula to eastern NE) | Scattered flash flood | WPC Slight | Overnight |
| E AZ / NM west of I-25 / SW CO | Heavy rain, outflow, burn-scar flood | WPC Slight | Afternoon–evening cells |
| Eastern North Carolina | Isolated gusty wind, small hail | Local / no categorical severe area | Isolated |
| Atlantic / Gulf vs. U.S. mainland | No landfalling tropical cyclone | NHC: no Atlantic TCs | Quiet on the mainland coast |
What this means for restoration teams
Watch 668 wind at 65–80 mph is roof, siding, gutter, and tree-on-structure work in Kansas and south-central Nebraska. The Slight Risk east of that box is the same plus a conditional tornado and large hail if a supercell holds from Lincoln–Omaha into western Iowa. Iowa’s Moderate flood risk is wet drywall and a same-night extraction clock if the 3-inch HREF signal verifies south of I-80. Do not send one crew to both the watch box and Des Moines without checking which county has a warning now.
For teams in or near Watch 668: stage before sunset, not after the first warning. Property owners should photograph damage in daylight if it is safe, call the carrier, and start extraction the same night if water is inside.
What this is not
This is not a regional derecho and not a U.S. mainland hurricane landfall. National Hurricane Center products as of Monday afternoon, September 14, 2026, show no tropical cyclones in the Atlantic. Tropical Storm Norbert is in the east-central Pacific about 1,125 miles east of Hilo, Hawaii, with 40 mph winds and a weakening trend. Tropical Depression Fifteen-E is about 785 miles southwest of the southern tip of Baja California. Neither threatens U.S. mainland land. The work tonight, if it comes, will be scattered: a wind swath in the Kansas–Nebraska watch, a hail or tornado report in the eastern Nebraska Slight Risk, flooded intersections south of I-80 in Iowa.
Looking ahead
The SPC Day 2 Convective Outlook issued 12:14 p.m. CDT Monday, September 14, 2026 (valid 12 UTC Tuesday through 12 UTC Wednesday) is a Marginal Risk in a corridor from Kansas into western Ohio. Summary language: scattered strong thunderstorms may occur from the Great Lakes southwestward through the lower Missouri Valley Tuesday afternoon and evening, with at least isolated damaging wind gusts possible. Shear is forecast to be weak. Storms should be primarily short-lived, with a few clusters near the front. Watch the next Storm Tracker update rather than assuming Watch 668 is the last line of the week.
Sources and how to verify
Primary sources dated Monday, September 14, 2026: NOAA Storm Prediction Center 2000 UTC Day 1 Convective Outlook; Severe Thunderstorm Watch 668; SPC current watches and today’s LSR page (no reports in the 12 UTC Monday window at desk time); Weather Prediction Center Day 1 Excessive Rainfall Outlook updated 0733 UTC; National Hurricane Center Atlantic and East Pacific public pages. Morning desk on the same calendar day: Storm Updates: Eastern Nebraska–Iowa Slight Risk, Iowa Flood Moderate — Monday, September 14, 2026 (Morning).
Check weather.gov for the county warning, spc.noaa.gov for the outlook, watch, and LSRs, Watch 668, and WPC excessive rainfall for the flood overlay.
Informational only — not an official weather warning. Follow local authorities and the National Weather Service. Turn around, don’t drown.