The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| Event typeevent_type | Heavy Rain |
|---|---|
| NOAA NCEI event IDncei_event_id | 368,371 |
| Episode IDepisode_id | 61,560 |
| Begin UTCbegin_utc | 2012-04-14T12:00:00+00:00 |
| End UTCend_utc | 2012-04-15T12:00:00+00:00 |
| Statestate | NEBRASKA |
| County/zone typecz_type | C |
| County/zone namecz_name | THAYER |
| Latitudelat | 40.470 |
| Longitudelon | -97.530 |
| End latitudeend_lat | 40.470 |
| End longitudeend_lon | -97.530 |
| 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 | COOP Observer |
| Episode narrativeepisode_narrative | Multiple rounds of severe thunderstorms pounded parts of the 24-county area on this Saturday, resulting in numerous reports of large hail and damaging winds along with four brief EF0 tornadoes. However, considering that the entire area spent the day under its only High Risk convective outlook of the spring from the Storm Prediction Center, the situation could have been worse. No injuries were reported in South Central Nebraska, and all significant, long-track tornadoes in the region remained to the south across central and southern Kansas and northern Oklahoma. Locally, most severe weather targeted counties between Interstate 80 and the Kansas border. The first three brief tornadoes occurred between 2-3 PM CDT in Nuckolls and Thayer Counties, as a rain-wrapped supercell tracked out of northern Kansas. One of these tornadoes struck a farm just north of Alexandria, where a grain bin was toppled and a roof torn off a shed. A few hours later, the final and most-photographed tornado of the day touched down shortly after 6 PM CDT in Harlan County northeast of Oxford and crossed Highway 6, destroying a grain bin along the way. ||During this prolonged event, severe thunderstorms affected parts of the area for roughly 13 hours, mainly between 1030 AM and 1130 PM CDT. The first round of severe weather focused across northern portions of the area during the late morning as an elevated supercell tracked across parts of Sherman, Valley and Greeley Counties. This storm was a prolific hail producer, with hail of at least 2 inches in diameter causing considerable damage to homes and vehicles, especially north and west of Spalding. As these early storms exited to the northeast, the focus shifted south to near the Kansas border, as the next cluster of more-surface-based severe storms with embedded tornadic circulations lifted through primarily Nuckolls, Thayer and Fillmore Counties between 1-4 PM CDT. After a brief lull, a few more supercells fired up farther west around 5 PM CDT, with one of these storms producing the tornado near Oxford before weakening as it tracked northeast toward Kearney. Yet again, a brief lull ensued, before numerous severe thunderstorms flared up mainly south of Interstate 80 during the 830-1130 PM CDT time frame. Although these storms were not tornadic, multiple hail and wind reports included baseball size hail near Glenvil, golf ball size hail near Edison and McCool Junction and estimated 70 MPH winds and toppled irrigation center pivots near Campbell and east of Clay Center. Finally, between 1130 PM and 2 AM CDT, the remaining storms gradually weakened and exited the area to the east. ||Although significant flooding was not an issue, most areas southeast of a line from Osceola to Franklin measured at least 1-2 inches of rain, with 2-3 inch amounts most concentrated within Nuckolls, Thayer and Fillmore Counties, including a 3.70-inch total just west of Tobias along the Fillmore and Saline County line. ||This long-lasting severe weather outbreak was driven by a classic synoptic setup, as a powerful mid-upper level trough approached the Central Plains from the Four Corners region, featuring a 300 millibar jet streak in excess of 110 knots. At the surface, low pressure deepened over the course of the day, registering around 992 millibars by early evening over northwest Kansas. A well-defined warm front extended east from this low across South Central Nebraska, as a sharpening dryline took shape along a line from southwest Nebraska to far western Oklahoma. With a strengthening and veering wind profile with height, shear parameters were quite supportive of significant severe weather. Around the time of the late afternoon tornado near Oxford, mesoscale severe weather parameters included around 1500 J/Kg mixed layer CAPE, 60-70 knots of deep layer vertical wind shear and 30-40 knots of surface-to-1 kilometer low level vertical shear. In addition, surface-to-1 kilometer storm relative helicity increased into at least the 300-500 m2/s2 range during the late afternoon and evening hours, promoting a volatile environment for potentially strong, long-track tornadoes. Fortunately for South Central Nebraska, the sheer number of storms along with resultant storm-scale interference likely mitigated what could have been a more significant tornado event. ||On a regional and even national level, this was one of the most anticipated and well-advertised Central Plains tornado outbreaks ever. Although the majority of South Central Nebraska was not in a High Risk outlook from the Storm Prediction Center until the early morning hours of the 14th, parts of Kansas and Oklahoma were placed under a High Risk early on the 13th, marking the first time SPC ever issued a High Risk forecast so far in advance. |
| Event narrativeevent_narrative | Storm total precipitation of 3.34 inches was reported. |
| Yearyear | 2,012 |
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