Alert archive / Iowa / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 307
The Storm Prediction Center issued this severe thunderstorm watch at Jun 16, 2014, 9:01 PM CDT for 11 counties in Illinois; 19 counties in Iowa. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 16, 2014, 9:01 PM CDT (02:01 UTC)
- Expired
- Jun 17, 2014, 5:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 30 counties
Benton County, IA, Buchanan 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, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 60 km from the middle of the area, began a volume at 02:02 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 60%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 16, 9:14 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Linn | 61 min |
| Jun 16, 9:32 PM CDT | Tornado Warning | DVN | Delaware | 28 min |
| Jun 16, 9:42 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 63 min |
| Jun 16, 9:47 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Linn | 43 min |
| Jun 16, 10:02 PM CDT | Tornado Warning | DVN | Benton, Linn | 28 min |
| Jun 16, 10:13 PM CDT | Tornado Warning | DVN | Benton, Linn | 32 min |
| Jun 16, 10:27 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Jones, Linn | 63 min |
| Jun 17, 2:33 AM CDT | Severe Thunderstorm Warning | DVN | Iowa, Keokuk, Washington | 27 min |
| Jun 17, 3:28 AM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 32 min |
| Jun 17, 3:36 AM CDT | Tornado Warning | DVN | Rock Island | 24 min |
| Jun 17, 4:02 AM CDT | Severe Thunderstorm Warning | DVN | Carroll, Henry, Rock Island, Whiteside | 43 min |
| Jun 17, 4:33 AM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 42 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 00:00Z, 2.0 hours before the alert went out and 65 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
- 2074 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1135 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 5.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 16, 9:24 PM CDT | Severe Thunderstorm Watch | SPC | Boone, DeKalb, Kane, LaSalle, Lee, McHenry and 2 more | 6 hr |
| Jun 16, 11:40 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Grundy, Henry and 12 more | 65 min |
| Jun 17, 1:29 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, DeKalb, Henderson, Henry, Kane and 11 more | 91 min |
| Jun 17, 3:41 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 19 more | 64 min |
| Jun 17, 4:11 AM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 16 more | 3 hr |
| Jun 17, 4:58 AM CDT | Mesoscale Discussion | SPC | Boone, Cook, DuPage, Kane, Lake, McHenry | 62 min |
| Jun 17, 1:58 PM CDT | Mesoscale Discussion | SPC | Bureau, Grundy, Henry, Iroquois, Kankakee, Kendall and 11 more | 92 min |
| Jun 16, 9:11 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Calhoun, Carroll, Cherokee, Crawford and 15 more | 64 min |
| Jun 16, 9:56 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Appanoose, Audubon, Boone, Buena Vista, Calhoun and 34 more | 5 hr |
| Jun 16, 11:11 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 23 more | 64 min |
| Jun 17, 5:12 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Lyon, O'Brien, Osceola and 2 more | 2 hr |
| Jun 17, 6:48 PM CDT | Tornado Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2014Severe Thunderstorm Watches in Illinois, 2014Every severe thunderstorm watch in 2014
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.