Alert archive / Illinois / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 63
The Storm Prediction Center issued this severe thunderstorm watch at May 2, 2018, 3:56 PM CDT for 39 counties in Illinois; 16 counties in Iowa; Clark County, Scotland County, Missouri. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- May 2, 2018, 3:56 PM CDT (20:56 UTC)
- Expired
- May 3, 2018, 1:00 AM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 57 counties
Cedar County, IA, Clinton County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Clark County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 24 km from the middle of the area, began a volume at 20:56 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
31 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 4:35 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Will | 25 min |
| May 2, 4:39 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 38 min |
| May 2, 4:51 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 24 min |
| May 2, 4:58 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 32 min |
| May 2, 5:02 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 43 min |
| May 2, 5:04 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Stephenson | 56 min |
| May 2, 5:17 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 43 min |
| May 2, 5:19 PM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 27 min |
| May 2, 5:46 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Ogle, Winnebago | 44 min |
| May 2, 5:53 PM CDT | Severe Thunderstorm Warning | LOT | Ogle | 52 min |
| May 2, 5:57 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Lee | 48 min |
| May 2, 6:04 PM CDT | Severe Thunderstorm Warning | DVN | Whiteside | 56 min |
| May 2, 6:20 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess | 15 min |
| May 2, 6:20 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Kane, McHenry | 40 min |
| May 2, 6:28 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 47 min |
| May 2, 6:34 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle | 41 min |
| May 2, 6:34 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle | 41 min |
| May 2, 6:34 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 56 min |
| May 2, 6:47 PM CDT | Tornado Warning | DVN | Keokuk | 43 min |
| May 2, 7:02 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Lake, McHenry | 43 min |
| May 2, 7:18 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Washington | 57 min |
| May 2, 7:24 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Lake | 36 min |
| May 2, 7:24 PM CDT | Tornado Warning | DVN | Johnson, Washington | 51 min |
| May 2, 7:51 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 39 min |
| May 2, 7:51 PM CDT | Tornado Warning | DVN | Cedar, Johnson, Muscatine | 20 min |
| May 2, 7:58 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk, Washington | 29 min |
| May 2, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Muscatine | 53 min |
| May 2, 8:31 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 59 min |
| May 2, 8:34 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Scott | 27 min |
| May 2, 9:08 PM CDT | Severe Thunderstorm Warning | LOT | Lake, McHenry | 52 min |
| May 2, 9:53 PM CDT | Severe Thunderstorm Warning | DVN | Whiteside | 52 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 1:33 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, Fulton, Grundy, Hancock and 23 more | 117 min |
| May 2, 5:29 PM CDT | Mesoscale Discussion | SPC | Cook | 91 min |
| May 1, 7:24 PM CDT | Mesoscale Discussion | SPC | Adams, Cass, Fremont, Harrison, Mills, Montgomery and 4 more | 2 hr |
| May 1, 7:55 PM CDT | Mesoscale Discussion | SPC | Adair, Allamakee, Audubon, Benton, Black Hawk, Boone and 48 more | 95 min |
| May 1, 9:38 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Benton, Black Hawk, Boone, Bremer and 29 more | 67 min |
| May 2, 5:08 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Clarke, Davis, Decatur and 15 more | 97 min |
| May 2, 5:27 PM CDT | Tornado Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 9 more | 8 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2018Severe Thunderstorm Watches in Iowa, 2018Severe Thunderstorm Watches in Missouri, 2018Every severe thunderstorm watch in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.