Alert archive / Iowa / Tornado Watches in 2024
Tornado Watch 150
The Storm Prediction Center issued this tornado watch at Apr 27, 2024, 5:58 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2024, 5:58 PM CDT (22:58 UTC)
- Expired
- Apr 28, 2024, 12:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 42 counties
Benton County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque 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, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Knox County, MO, Lewis County, MO, Scotland County, MO, Shelby County, MO, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI
The radar
The Quad Cities radar (KDVN), 62 km from the middle of the area, began a volume at 22:58 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 6:07 PM CDT | Severe Thunderstorm Warning | MKX | Green, Lafayette | 53 min |
| Apr 27, 6:18 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 42 min |
| Apr 27, 6:35 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Keokuk | 40 min |
| Apr 27, 6:40 PM CDT | Tornado Warning | MKX | Green | 16 min |
| Apr 27, 6:54 PM CDT | Severe Thunderstorm Warning | MKX | Green | 51 min |
| Apr 27, 6:57 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Van Buren | 48 min |
| Apr 27, 7:03 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Keokuk, Washington | 42 min |
| Apr 27, 7:35 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Muscatine, Washington | 40 min |
| Apr 27, 7:40 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Van Buren | 50 min |
| Apr 27, 7:41 PM CDT | Severe Thunderstorm Warning | DVN | Louisa, Muscatine, Washington | 34 min |
| Apr 27, 7:58 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson | 28 min |
| Apr 27, 8:06 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Lee, Washington | 39 min |
| Apr 27, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 38 min |
| Apr 27, 8:09 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Jones, Scott | 39 min |
| Apr 27, 8:14 PM CDT | Severe Thunderstorm Warning | MKX | Lafayette | 21 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 69 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 392 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 673 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 288 m²/s²
- 0-3 km storm-relative helicity
- 385 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 3:40 PM CDT | Mesoscale Discussion | SPC | Henderson, Mercer, Rock Island | 95 min |
| Apr 27, 5:17 PM CDT | Mesoscale Discussion | SPC | Carroll, Hancock, Henderson, Jo Daviess, Mercer, Rock Island and 1 more | 58 min |
| Apr 26, 7:27 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 16 more | 93 min |
| Apr 27, 1:40 PM CDT | Tornado Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 10 more | 7 hr |
| Apr 27, 11:33 AM CDT | Mesoscale Discussion | SPC | Holt | 117 min |
| Apr 27, 4:31 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Cass, Cedar, Dade, Henry and 7 more | 59 min |
| Apr 27, 4:57 PM CDT | Tornado Watch | SPC | Barton, Bates, Benton, Carroll, Cass, Cedar and 19 more | 8 hr |
| Apr 27, 6:47 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Dane, Dodge, Fond du Lac, Jefferson, Kenosha and 8 more | 5 hr |
Nearby
Tornado Watches in Iowa, 2024Tornado Watches in Illinois, 2024Tornado Watches in Missouri, 2024Every tornado watch in 2024
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.