The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| Event typeevent_type | Funnel Cloud |
|---|---|
| NOAA NCEI event IDncei_event_id | 906,585 |
| Episode IDepisode_id | 148,777 |
| Begin UTCbegin_utc | 2020-07-26T00:29:00+00:00 |
| End UTCend_utc | 2020-07-26T00:29:00+00:00 |
| Statestate | MINNESOTA |
| County/zone typecz_type | C |
| County/zone namecz_name | SIBLEY |
| Latitudelat | 44.468 |
| Longitudelon | -94.394 |
| End latitudeend_lat | 44.468 |
| End longitudeend_lon | -94.394 |
| Deaths directdeaths_direct | 0 |
| Deaths indirectdeaths_indirect | 0 |
| Injuries directinjuries_direct | 0 |
| Injuries indirectinjuries_indirect | 0 |
| Damage propertydamage_property | 0.00K |
| Damage cropsdamage_crops | 0.00K |
| Weather forecast office sourcewfo_source | Trained Spotter |
| Episode narrativeepisode_narrative | A very anomalous moist atmosphere was in place for this flash flood event to develop. Precipitable water values (PWATs) were over 2 inches across southern Minnesota which is well over climatological normals. The 2.25 inches of precipitable water tallied from the 7 PM weather balloon launch at Chanhassen was just below record record levels for the day and was above the 95th percentile for this time of year. ||There were very subtle outflow boundaries during the afternoon from earlier thunderstorms in southern Minnesota. There was enough surface boundary interaction to develop a few funnel clouds where the thunderstorms formed. There were even two tornado touchdowns near Gaylord and a funnel cloud near Lafayette. ||The main event was the flash flood event where storms formed Saturday afternoon between Redwood Falls, and the Twin Cities metro area. There were several waves of thunderstorms Saturday evening that propagated east-southeast across far southern Minnesota. The first area was concentrated between Redwood Falls and Henderson, Minnesota. This areas held together for nearly 4 hours before shifting slightly to the southeast toward the Minnesota River. Between 9 PM and 1 AM LST, the heaviest precipitation axis shifted along the Minnesota River Valley from Granite Falls, southeast to New Ulm, Mankato and then toward Waseca. After 1 AM LST, a much broader area of showers and thunderstorms started to develop across the rest of southern and western Minnesota. However, there still remained several hours of moderate to heavy rainfall in the same areas that received the heavier rainfall Saturday evening.||Based on MRMS-FLASH (Multi-Radar Multi-Sensor) (Flooded Locations and Simulated Hydrographs), excessive rainfall rates, and training over the same locations for a long period of time, the first concentrated area of flash flooding occurred over Sibley County where the recurrence interval was over 200 years for the 3, 6, and 12 hour periods. By midnight, this area of 200 year recurrence interval moved westward into southeastern Renville County. Between midnight and 4 AM LST, this area of 200 year recurrence interval moved east-southeast and oriented from Redwood Falls, southeast along the Minnesota River Valley, east/southeast toward Waseca. ||The heaviest rainfall and the hardest hit areas in terms of rainfall totals were over southeast Renville, southern Sibley, Nicollet, southwest Le Sueur, northern Blue Earth, and a part of northwest Waseca Counties.||The highest known total for this storm came from a trained observer near Winthrop in Sibley County where they measured 11.50 inches. Other high totals in that area included 10.70 inches near Lafayette and 9.15 inches in Gibbon. ||The state climate office categorized the heavy rainfall event in south central Minnesota as a mega-rain. Their criteria for a mega-rain is six inches of rain or more over an area of roughly 1000 square miles. This was the first mega-rain event in Minnesota since 2016. |
| Event narrativeevent_narrative | Three different trained spotters saw a funnel cloud just northwest and north of Lafayette. |
| Yearyear | 2,020 |
Provenance
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