Alert archive / Iowa / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 351

July 7, 20164 states

The Storm Prediction Center issued this severe thunderstorm watch at Jul 7, 2016, 3:54 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 7, 2016, 3:54 PM CDT (20:54 UTC)
Expired
Jul 7, 2016, 9:03 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 65 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Union County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Faribault County, MN, Jackson County, MN, Martin County, MN, Nobles County, MN, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Madison County, NE, Platte County, NE, Sarpy County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Union County, SD

The radar

The Sioux Falls radar (KFSD), 138 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
20%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
5%
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
80%

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 7, 4:01 PM CDTSevere Thunderstorm WarningOAXMonona44 min
Jul 7, 4:39 PM CDTSevere Thunderstorm WarningOAXMonona51 min
Jul 7, 4:53 PM CDTSevere Thunderstorm WarningDMXKossuth, Palo Alto39 min
Jul 7, 5:12 PM CDTSevere Thunderstorm WarningOAXHarrison48 min
Jul 7, 5:30 PM CDTSevere Thunderstorm WarningDMXKossuth2 min
Jul 7, 6:00 PM CDTSevere Thunderstorm WarningOAXShelby29 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

Omaha, NE (KOAX), launched 12:00Z, 8.9 hours before the alert went out and 161 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.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2016-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2016-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -269 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
7 J/kg
Mixed-layer CIN
-552 J/kg
Mixed-layer LCL
778 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-269 m²/s²
0-3 km storm-relative helicity
-234 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 6, 7:38 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Harrison, Ida and 7 more6 hr
Jul 7, 12:30 AM CDTMesoscale DiscussionSPCAudubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 51 more90 min
Jul 7, 12:47 AM CDTSevere Thunderstorm WatchSPCAdair, Audubon, Black Hawk, Boone, Bremer, Butler and 37 more4 hr
Jul 7, 1:22 AM CDTMesoscale DiscussionSPCDecatur, Fremont, Page, Ringgold, Taylor, Wayne83 min
Jul 7, 1:37 AM CDTSevere Thunderstorm WatchSPCAdams, Appanoose, Clarke, Davis, Decatur, Fremont and 11 more6 hr
Jul 7, 3:52 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Chickasaw, Fayette and 8 more83 min
Jul 7, 4:27 AM CDTMesoscale DiscussionSPCAdams, Appanoose, Clarke, Davis, Decatur, Lucas and 6 more93 min
Jul 7, 5:26 AM CDTMesoscale DiscussionSPCAppanoose, Clarke, Davis, Decatur, Lucas, Monroe and 2 more2 hr
Jul 7, 6:01 AM CDTSevere Thunderstorm WatchSPCDes Moines, Henry, Jefferson, Lee, Van Buren6 hr
Jul 7, 8:10 AM CDTMesoscale DiscussionSPCDes Moines, Lee95 min
Jul 7, 1:50 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 41 more115 min
Jul 7, 6:30 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Black Hawk, Boone, Bremer and 39 more2 hr
Jul 7, 3:10 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Cass, Clay, Clearwater, Hubbard and 9 more2 hr
Jul 6, 9:28 PM CDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Butler, Clay, Colfax and 29 more2 hr
Jul 6, 9:47 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Clay, Custer, Dawson, Fillmore and 20 more5 hr
Jul 7, 2:31 AM CDTMesoscale DiscussionSPCFranklin, Furnas, Harlan, Nuckolls, Red Willow, Thayer and 1 more89 min
Jul 7, 2:40 PM CDTMesoscale DiscussionSPCAdams, Banner, Buffalo, Chase, Cheyenne, Clay and 23 more2 hr
Jul 7, 5:14 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Furnas, Gosper, Harlan and 3 more3 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2016Severe Thunderstorm Watches in Nebraska, 2016Severe Thunderstorm Watches in Minnesota, 2016Every severe thunderstorm watch in 2016

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.