Alert archive / Iowa / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 150
The Storm Prediction Center issued this severe thunderstorm watch at May 12, 2014, 1:00 PM CDT for 14 counties in Illinois; 33 counties in Iowa; 12 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 12, 2014, 1:00 PM CDT (18:00 UTC)
- Expired
- May 12, 2014, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 59 counties
Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, 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, Adair County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO
The radar
The Quad Cities radar (KDVN), 137 km from the middle of the area, began a volume at 18:00 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
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| May 12, 1:20 PM CDT | Severe Thunderstorm Warning | EAX | Putnam, Sullivan | 40 min |
| May 12, 1:39 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Wayne | 36 min |
| May 12, 2:47 PM CDT | Flash Flood Warning | DMX | Lucas | 6 hr |
| May 12, 3:14 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Marion, Monroe, Poweshiek, Wapello | 46 min |
| May 12, 3:36 PM CDT | Severe Thunderstorm Warning | DMX | Davis | 39 min |
| May 12, 3:45 PM CDT | Severe Thunderstorm Warning | DVN | Van Buren | 45 min |
| May 12, 4:13 PM CDT | Severe Thunderstorm Warning | EAX | Adair | 47 min |
| May 12, 4:18 PM CDT | Flash Flood Warning | DMX | Marion, Monroe | 6 hr |
| May 12, 4:18 PM CDT | Severe Thunderstorm Warning | LSX | Knox | 42 min |
| May 12, 4:24 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Van Buren | 51 min |
| May 12, 4:35 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson | 25 min |
| May 12, 4:48 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Washington | 42 min |
| May 12, 5:18 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Louisa, Muscatine, Washington | 42 min |
| May 12, 5:28 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Monroe, Shelby | 47 min |
| May 12, 7:38 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 52 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, 6.0 hours before the alert went out and 143 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
- 850 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 666 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 8:32 PM CDT | Mesoscale Discussion | SPC | DeWitt, Ford, Iroquois, Livingston, McLean | 58 min |
| May 12, 9:51 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 13 more | 84 min |
| May 12, 10:02 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more | 6 hr |
| May 12, 11:54 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Carroll, Fulton, Hancock and 16 more | 2 hr |
| May 12, 1:06 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 6 more | 54 min |
| May 12, 3:21 PM CDT | Mesoscale Discussion | SPC | Adams, Hancock, Henderson, Jo Daviess, McDonough, Mercer and 2 more | 54 min |
| May 12, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more | 7 hr |
| May 12, 6:56 PM CDT | Mesoscale Discussion | SPC | Boone, Jo Daviess, Lake, McHenry, Stephenson, Winnebago | 64 min |
| May 11, 7:04 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Calhoun, Carroll, Clarke and 21 more | 56 min |
| May 11, 7:49 PM CDT | Tornado Watch | SPC | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 38 more | 7 hr |
| May 11, 9:31 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 31 more | 59 min |
| May 11, 9:56 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills, Montgomery, Page | 6 hr |
| May 11, 11:01 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 40 more | 59 min |
| May 12, 2:38 AM CDT | Mesoscale Discussion | SPC | Bates, Buchanan, Carroll, Cass, Clay, Clinton and 8 more | 2 hr |
| May 12, 3:15 AM CDT | Severe Thunderstorm Watch | SPC | Caldwell, Carroll, Cass, Chariton, Clay, Clinton and 13 more | 3 hr |
| May 12, 11:52 AM CDT | Mesoscale Discussion | SPC | McDonald, Newton | 83 min |
| May 12, 2:12 PM CDT | Mesoscale Discussion | SPC | Audrain, Barry, Barton, Bates, Benton, Boone and 37 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2014Severe Thunderstorm Watches in Illinois, 2014Severe Thunderstorm Watches in Missouri, 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.