2015 Rochelle–Fairdale tornado

On April 4, 2015, the Storm Prediction Center (SPC) issued their Day 6 severe weather outlook, highlighting a substantial and widespread risk for severe weather from southeastern Oklahoma to northeastern Illinois valid for April 9. This threat area was maintained in the Day 5 outlook and narrowed to a corridor from southern Missouri into northern Illinois in the Day 4 outlook. On April 7, a Day 3 Enhanced risk was issued across most of Illinois, eastern Missouri, and small portions of adjacent states. No further changes to the threat level were made, although the Enhanced risk was significantly expanded late on April 8 to include portions of the southern Great Lakes, lower Ohio Valley, Ozark Plateau, and Ark-La-Tex region. Around midday on April 9, the SPC issued a 10% hatched tornado threat area across much of northern Illinois and small portions of nearby states, signifying the potential for several tornadoes, of which one or two had the potential to be strong (EF2 or stronger on the Enhanced Fujita scale). The catalyst for the severe weather outbreak came as a positively tilted shortwave trough progressed across the central High Plains into the Great Plains and eventually through the western Great Lakes region. A weaker disturbance pushed from the Ozarks into the Northeastern United States, acting to strengthen southwesterly winds aloft across the risk area. At the surface, a weak area of low pressure initially centered over northeastern Kansas early on April 9 progressed steadily northeast while intensifying, reaching the trisection of Iowa, Wisconsin, and Illinois by late that evening. A cold front stemming from the low progressed eastward across the Mid-South, whereas an arching warm front slowly pushed northward across eastern Iowa and northern Illinois. Modest surface heating ahead of the cold front allowed mid-level Convective Available Potential Energy (CAPE) values to reach 1,000–1,500 J/kg, and a mass of rich moisture transported northward from the Gulf of Mexico pushed dewpoints into the lower 60s °F across the Enhanced risk area. Winds at 850 mb (4,781 ft) strengthened at or above below winds of at , creating a favorable setup for sustained supercells. Although the overall directional component of low-level winds was expected to be less than ideal as a whole, a small area of southeasterly surface winds developed near the surface low in northern Illinois. Isolated shower activity began forming across the region just prior to the issuance of watch, eventually growing into a line of strong to severe thunderstorms, including supercells. One such high-precipitation supercell was first severe warned at 6:11 p.m. CDT (23:11 UTC); the National Weather Service office in Chicago, Illinois, warned of winds up to and quarter- to golf ball-sized hail. The weather forecast office upgraded the severe thunderstorm warning to a tornado warning at 6:35 p.m. CDT (23:35 UTC), and four minutes later, trained storm spotters reported a damaging tornado north of Ashton. This was one of several tornadoes observed across the Central United States on April 8 and April 9. ==Tornado summary==

The tornado first began at 6:39 p.m. CDT (23:39 UTC) on April 9, just northeast of Franklin Grove, Illinois. It touched down over a field, producing swirls in crops, before moving northeast, crossing IL 38 twice before causing EF1 damage to a Crest Foods plant. The tornado soon exited Lee County and entered Ogle County, inflicting EF1 damage to two farm outbuildings that were completely destroyed and EF0 damage to a similar structure that had a portion of its roof uplifted as it crossed IL 38 two more times. Intensifying to EF3 strength, much more severe damage was noted along South Skare Court as the tornado entered an area of semi-rural subdivisions to the northwest of Rochelle. A few homes in this area were destroyed at EF3 intensity, with other homes nearby sustaining EF2 damage. One large house had a room ripped off on its second floor, while a split-level home was almost completely leveled. As the tornado crossed South Richard Road, it intensified to very high-end EF4 strength and inflicted catastrophic damage to several large homes as it impacted the Deer Creek subdivision. Well-built homes along South Richard Road and East Kuehl Court were leveled and swept from their foundations with debris strewn downwind. Several vehicles parked at these residences were moved some distance or tossed, and wind rowing of debris occurred. One house had its concrete walkway pulled a few inches from its original location, and notable scouring of lawn grass was observed in the subdivision. These structures were estimated to have been impacted by winds near , the upper bound of an EF4 tornado. Continuing northeast, the tornado crossed the BNSF Aurora Subdivision and temporarily weakened as it approached and crossed another railway line, producing EF2 to EF3 damage. A few large barns and outbuildings were destroyed, two brick residences had their roofs ripped off, and another home had most of its walls collapsed. The tornado began to intensify again as it approached and crossed IL 251. A large restaurant and a residence had their exterior walls collapse in this area. Continuing northeast across Wheeler Road, one residence had a large portion of its roof ripped off, a second residence had its exterior walls collapsed, and a two-story 80-year-old well-constructed barn was destroyed. A large garage was destroyed and had its debris deposited well downstream, and significant denuding and debarking of trees was evident. Near the intersection of Irene Road and McNeal Road near Irene, a well-built seven-year-old house lost its second story and many exterior walls. A two-story, well-built barn with cinder block attachment was totally destroyed, and a nearby two-story, rebar-reinforced cinder block silo was ripped apart. Large farm equipment was tossed , and convergent scouring of road pavement was noted in this area. After passing over rural terrain, the tornado finally dissipated at 7:20 p.m. CDT (00:20 UTC) over Cherry Valley Road, ending its and 41-minute path of destruction. ==Aftermath==

In the immediate wake of the tornado, The Salvation Army and American Red Cross set up temporary shelters for residents in Fairdale. The Rochelle Community Hospital was shifted into "disaster mode" to quickly handle the large number of casualties. Equipment and resources from over a dozen nearby fire departments aided in sifting through the remains of dozens of houses. More than 675 volunteers, coordinated by the Virginia faith-based nonprofit organization Operation Blessing, and countless residents from surrounding areas assisted in cleanup efforts. AmeriCorps coordinated their own operations beginning on April 12. Switchyard Bar and Grill in Rochelle hosted a donation drive to provide victims with new household items. Ogle County Sheriff Brian VanVickle and DeKalb County Sheriff Roger Scott set up a lost-and-found for residents to retrieve missing items. Workers from "Bees Designs" created and sold shirts in Rochelle, with all proceeds donated to help tornado victims. A check from near Rochelle was discovered approximately northeast in Racine, Wisconsin, a common occurrence with violent tornadoes. Widespread severe weather across northern Illinois prompted the cancellation of more than 850 flights at Chicago O'Hare International Airport. Governor Bruce Rauner declared DeKalb and Ogle counties as state disaster areas, freeing up a wide variety of resources for response efforts. Both the governor and Illinois U.S. Senator Mark Kirk toured the area. Total economic losses from the tornado reached $19 million (). Possible EF5 intensity On January 23, 2025, Anthony W. Lyza with the National Severe Storms Laboratory along with Harold E. Brooks and Makenzie J. Kroca with the University of Oklahoma’s School of Meteorology published a paper to the American Meteorological Society, where they stated the tornado in Rochelle was an "EF5 candidate" and opined that the EF5 starting wind speed should be instead of . ==See also==