Alert archive / Iowa / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 391

June 14, 201237 counties in Iowa; 23 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jun 14, 2012, 3:27 PM CDT for 37 counties in Iowa; 23 counties in Nebraska. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 14, 2012, 3:27 PM CDT (20:27 UTC)
Expired
Jun 14, 2012, 11:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 60 counties

Audubon 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, Dickinson County, IA, Emmet County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Hancock County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Page County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thurston County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 132 km from the middle of the area, began a volume at 20:31 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
40%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 14, 3:48 PM CDTSevere Thunderstorm WarningOAXButler, Colfax, Saunders57 min
Jun 14, 4:33 PM CDTSevere Thunderstorm WarningOAXButler, Dodge, Saunders57 min
Jun 14, 4:37 PM CDTSevere Thunderstorm WarningOAXHarrison, Monona38 min
Jun 14, 4:47 PM CDTSevere Thunderstorm WarningOAXButler, Saunders46 min
Jun 14, 5:06 PM CDTSevere Thunderstorm WarningFSDIda, Woodbury39 min
Jun 14, 5:16 PM CDTFlash Flood WarningOAXButler, Saunders2 hr
Jun 14, 5:38 PM CDTSevere Thunderstorm WarningOAXHarrison52 min
Jun 14, 6:00 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe, Saunders, Seward30 min
Jun 14, 6:01 PM CDTSevere Thunderstorm WarningFSDBuena Vista29 min
Jun 14, 6:07 PM CDTSevere Thunderstorm WarningOAXHarrison, Pottawattamie38 min
Jun 14, 6:25 PM CDTSevere Thunderstorm WarningFSDClay, O'Brien35 min
Jun 14, 6:28 PM CDTSevere Thunderstorm WarningFSDBuena Vista, Clay17 min
Jun 14, 6:28 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe, Saline, Sarpy, Saunders and 1 more47 min
Jun 14, 6:31 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida, Plymouth, Woodbury29 min
Jun 14, 6:47 PM CDTSevere Thunderstorm WarningFSDWoodbury23 min
Jun 14, 6:50 PM CDTSevere Thunderstorm WarningFSDCherokee26 min
Jun 14, 6:56 PM CDTSevere Thunderstorm WarningFSDClay34 min
Jun 14, 6:56 PM CDTSevere Thunderstorm WarningOAXMills, Pottawattamie34 min
Jun 14, 7:09 PM CDTSevere Thunderstorm WarningFSDDickinson36 min
Jun 14, 7:10 PM CDTSevere Thunderstorm WarningDMXEmmet, Kossuth, Winnebago50 min
Jun 14, 7:13 PM CDTSevere Thunderstorm WarningOAXGage, Johnson, Lancaster, Otoe, Saline47 min
Jun 14, 7:17 PM CDTSevere Thunderstorm WarningDMXEmmet, Palo Alto43 min
Jun 14, 7:52 PM CDTSevere Thunderstorm WarningDMXEmmet, Kossuth38 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, 8.5 hours before the alert went out and 132 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 2012-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1190 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 2012-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 square meters per square second.193958Sfc1 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
1190 J/kg
Mixed-layer CIN
-322 J/kg
Mixed-layer LCL
951 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 14, 1:44 PM CDTMesoscale DiscussionSPCDickinson, Emmet, Lyon, O'Brien, Osceola, Sioux2 hr
Jun 14, 6:07 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Calhoun, Carroll, Cass and 15 more83 min
Jun 14, 1:41 PM CDTMesoscale DiscussionSPCAdams, Butler, Clay, Colfax, Cuming, Dodge and 22 more64 min
Jun 14, 3:11 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Clay, Dawson, Fillmore, Franklin and 19 more7 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2012Severe Thunderstorm Watches in Nebraska, 2012Every severe thunderstorm watch in 2012

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.