Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

Overview

A powerful storm system moved northeast across eastern Iowa into southwest Wisconsin sweeping a strong cold front through the area during the afternoon hours of Thursday, April 20th. A line of thunderstorms developed quickly along the front, with some of them surpassing severe thresholds producing hail up to the size of a golf ball.

An EF1 tornado tracked to the northeast for about 6 miles starting just east of Morrison, IL just before 4 PM CDT.

SPC Severe Weather Event Review for Thursday April 20, 2023

WPC Surface Fronts and Radar Map

Tornadoes
Radar
Storm Reports
Hail Photos
Environment

Tornadoes:

Tornado 1 - Morrison to Malvern, IL
Whiteside County

Date	4/20/2023
Time (Local)	3:56 - 4:03 PM CDT
EF Rating	EF-1
Est. Peak Winds	110 MPH
Path Length	5.9 miles
Max Width	300 yards
Injuries/Deaths	0 / 0
Summary: An NWS survey team confirmed an EF-1 tornado occurred over portions of Whiteside County Thursday afternoon east of Morrison. The tornado damaged trees, farm outbuildings and power poles, and was likely a multi-vortex tornado.

Track Map

Tornado - LOCATION
COUNTY NAME

Date
Time (Local)
EF Rating
Est. Peak Winds
Path Length
Max Width
Injuries/Deaths
Summary: Short summary of the tornado.

Track Map

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Hail


1 N Orion, IL P. Nilles	1 N Orion, IL P. Nilles


1 N Orion, IL P. Nilles	Kewanee, IL E. Michael

Radar

IEM Interactive Radar Loop

Storm Reports

IEM Storm Reports

SPC Severe Weather Event: Apr 20, 2023

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
741 PM CDT THU APR 20 2023

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0214 PM HAIL 1 N WAYLAND 40.41N 91.58W
04/20/2023 M1.00 INCH CLARK MO PUBLIC

VIA SOCIAL MEDIA. TIME ESTIMATED USING
RADAR.

0230 PM HAIL 1 NNE FORT MADISON 40.63N 91.34W
04/20/2023 M0.25 INCH LEE IA TRAINED SPOTTER

0258 PM FUNNEL CLOUD 1 NE BURNSIDE 40.51N 91.08W
04/20/2023 HANCOCK IL LAW ENFORCEMENT

0258 PM HAIL 1 NNW ELDRIDGE 41.65N 90.59W
04/20/2023 E0.25 INCH SCOTT IA NWS EMPLOYEE

0308 PM HAIL INDUSTRY 40.32N 90.61W
04/20/2023 M1.00 INCH MCDONOUGH IL TRAINED SPOTTER

0310 PM HAIL INDUSTRY 40.32N 90.61W
04/20/2023 M1.00 INCH MCDONOUGH IL TRAINED SPOTTER

HAIL LASTED 5 MINUTES AND NEARLY COVERED THE
GROUND.

0310 PM HAIL 1 W INDUSTRY 40.33N 90.64W
04/20/2023 M0.70 INCH MCDONOUGH IL TRAINED SPOTTER

0312 PM HAIL 1 W INDUSTRY 40.33N 90.64W
04/20/2023 M1.00 INCH MCDONOUGH IL TRAINED SPOTTER

HAIL SIZE INCREASED TO QUARTERS.

0315 PM HAIL SHERRARD 41.32N 90.51W
04/20/2023 E0.75 INCH MERCER IL PUBLIC

0320 PM HAIL 1 N ORION 41.37N 90.37W
04/20/2023 E3.00 INCH HENRY IL TRAINED SPOTTER

SPOTTER REPORTED MOSTLY QUARTERS WITH A FEW
STONES UP TO 3.0 INCHES. TIME OF THE EVENT
ESTIMATED USING RADAR.

0320 PM HAIL ORION 41.35N 90.37W
04/20/2023 M2.00 INCH HENRY IL PUBLIC

RELAYED VIA SOCIAL MEDIA.

0320 PM HAIL ORION 41.35N 90.37W
04/20/2023 E1.75 INCH HENRY IL PUBLIC

RELAYED VIA SOCIAL MEDIA.

0320 PM HAIL ORION 41.35N 90.37W
04/20/2023 E1.75 INCH HENRY IL PUBLIC

RELAYED BY BROADCAST MEDIA. VIEWER PHOTO.

0337 PM HAIL GENESEO 41.45N 90.15W
04/20/2023 E1.75 INCH HENRY IL PUBLIC

MEDIA RELAYED A VIEWER PHOTO OF GOLF BALL
SIZE HAIL.

0339 PM HAIL GENESEO 41.45N 90.15W
04/20/2023 M0.70 INCH HENRY IL TRAINED SPOTTER

0341 PM HAIL MOUNT CARROLL 42.10N 89.98W
04/20/2023 M0.88 INCH CARROLL IL PUBLIC

REPORTED VIA SOCIAL MEDIA.

0345 PM HAIL GENESEO 41.45N 90.15W
04/20/2023 M1.00 INCH HENRY IL BROADCAST MEDIA

0402 PM HAIL 2 SW GALVA 41.15N 90.06W
04/20/2023 M0.88 INCH HENRY IL EMERGENCY MNGR

NICKEL HAIL 1.5 MILES SOUTHWEST OF GALVA.

0403 PM HAIL GALVA 41.17N 90.04W
04/20/2023 E1.00 INCH HENRY IL PUBLIC

RELAYED VIA SOCIAL MEDIA. TIME ESTIMATED BY
RADAR.

0405 PM HAIL 2 SW GALVA 41.15N 90.06W
04/20/2023 M1.00 INCH HENRY IL EMERGENCY MNGR

QUARTER SIZE HAIL 1.5 MILES SOUTHWEST OF
GALVA.

0413 PM HAIL KEWANEE 41.24N 89.93W
04/20/2023 E1.25 INCH HENRY IL PUBLIC

0413 PM HAIL KEWANEE 41.24N 89.93W
04/20/2023 E1.00 INCH HENRY IL PUBLIC

RELAYED VIA SOCIAL MEDIA. TIME ESTIMATED BY
RADAR.

0416 PM HAIL 1 S KEWANEE 41.23N 89.93W
04/20/2023 M1.00 INCH HENRY IL EMERGENCY MNGR

0423 PM HAIL NEPONSET 41.30N 89.79W
04/20/2023 E1.00 INCH BUREAU IL PUBLIC

RELAYED VIA SOCIAL MEDIA.

0448 PM HAIL 1 SE PRINCETON 41.37N 89.45W
04/20/2023 M1.00 INCH BUREAU IL TRAINED SPOTTER

Environment

SPC Severe Weather Event Review for Thursday April 20, 2023


Day 1 Outlook 1300Z	Day 1 Outlook 1630Z	Tornado Watch 154


SPC MD 577	SPC MD 579	SPC MD 582

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Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Event Summary: April 20, 2023 - Updated 4/22 with Damage Survey