A couple locations in Phillips County experienced severe winds and hail on this Monday, and significant rain also fell. At noon CST, an area of scattered thunderstorms moved into north central Kansas. The area of storms was leftover from previous afternoon and nighttime convection and was associated with an advancing outflow boundary. By this time, new thunderstorms were beginning to form over north central Kansas as well. A quasi-stationary line of thunderstorms formed from southwest to northeast across Phillips and Rooks counties between noon and 4 PM CST. This line fell apart, but one last storm moved into Rooks County by 5 PM CST and weakened as it moved into southeastern Phillips County by 6 PM CST. Severe hail occurred in a couple spots around 1 PM CST. Hail the size of pennies fell just north of the town of Speed, and hail the size of quarters fell near the Phillips-Smith County line north of Agra. The final storm that weakened over Phillips County produced winds up to 70 mph near the town of Glade. The echo-training resulted in heavy rainfall amounts between 3 and 4 inches from western Rooks into central Phillips counties. Meanwhile, an area of 4-8 inches of rain fell over Gove, Graham, and Trego counties, with the highest observation of 9.88 inches measured in southwestern Graham County. As all this water drained into the South Fork of the Solomon River and Bow Creek, along with their tributaries, water levels shot up rapidly during the evening, with flooding occurring in crop and pasture land adjacent to these features. The South Fork of the Solomon River west of the Webster Reservoir rose into moderate flood stage and crested at 13.56 ft around 6 AM CST Tuesday (flood stage is 8.5 ft). Bow Creek near Stockton rose into minor flood stage and crested at 10.55 ft late Tuesday morning (flood stage is 9.0 ft). Just downstream from the river gauge, water from Bow Creek was flowing over the bridge near east 500 Rd and Day Dream Rd.
Scattered thunderstorms developed well to the west during the previous afternoon and night, along and ahead of a cold front. The resulting MCS sent an outflow boundary across north central Kansas, which aided in initiating new storms. A persistent trough was over the Western U.S. with an embedded cut-off low, with a downstream ridge over the Upper Midwest. Fairly weak southwest flow was over the Central Plains. In advance of the storms, temperatures had risen into the 80s with dewpoints in the 60s. Combined with mid-level lapse rates near 7.5 C/km, this resulted in MLCAPE between 2500 and 3000 J/kg. Deep layer shear was around 30 kts.

Hail in PHILLIPS, KANSAS
From 28-MAY-18 12:49:00 to 28-MAY-18 12:49:00 (CST-6)
Location: AGRA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PHILLIPS, KANSAS
From 28-MAY-18 13:04:00 to 28-MAY-18 13:04:00 (CST-6)
Location: SPEED
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PHILLIPS, KANSAS
From 28-MAY-18 17:52:00 to 28-MAY-18 17:52:00 (CST-6)
Location: GLADE
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This wind gust was measured with a hand-held anemometer.

Heavy Rain in ROOKS, KANSAS
From 28-MAY-18 06:00:00 to 29-MAY-18 06:00:00 (CST-6)
Location: WEBSTER RES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm total precipitation of 3.28 inches was measured by a mesonet site located 6 miles north of Webster State Park.

Heavy Rain in PHILLIPS, KANSAS
From 28-MAY-18 06:00:00 to 29-MAY-18 06:00:00 (CST-6)
Location: PHILLIPSBURG ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Storm total precipitation of 3.81 inches was measured by the Phillipsburg Airport AWOS.

Heavy Rain in ROOKS, KANSAS
From 28-MAY-18 06:00:00 to 29-MAY-18 06:00:00 (CST-6)
Location: DAMAR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm total precipitation of 4.04 inches was measured by a mesonet site located 1 mile north-northwest of Damar.