Alert archive / Iowa / Mesoscale Discussions in 2020

Mesoscale Discussion 709

May 24, 202025 counties in Iowa; 10 counties in Missouri; 8 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 24, 2020, 3:25 PM CDT for 25 counties in Iowa; 10 counties in Missouri; 8 counties in Nebraska. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
May 24, 2020, 3:25 PM CDT (20:25 UTC)
Expired
May 24, 2020, 5:00 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 217
All 43 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Douglas County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Richardson County, NE, Sarpy County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 20:24 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.4 hours before the alert went out and 122 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 2020-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 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 2020-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
67 J/kg
Mixed-layer CIN
-302 J/kg
Mixed-layer LCL
994 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
61 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 23, 11:58 PM CDTSevere Thunderstorm WatchSPCCherokee, Harrison, Ida, Lyon, Mills, Monona and 6 more6 hr
May 24, 4:13 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 56 more62 min
May 24, 5:30 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 31 more4 hr
May 24, 1:13 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Cass and 21 more92 min
May 24, 1:40 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 32 more6 hr
May 24, 2:58 PM CDTMesoscale DiscussionSPCBarry, Benton, Camden, Cedar, Christian, Cole and 21 more2 hr
May 23, 7:53 PM CDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Cherry, Custer, Dawson and 13 more97 min
May 23, 8:29 PM CDTSevere Thunderstorm WatchSPCArthur, Blaine, Brown, Chase, Cherry, Custer and 16 more5 hr
May 23, 11:08 PM CDTMesoscale DiscussionSPCBlaine, Brown, Custer, Dawson, Lincoln, Logan and 4 more2 hr
May 24, 1:20 AM CDTMesoscale DiscussionSPCBoone, Greeley, Nance, Valley, Wheeler55 min
May 24, 5:14 PM CDTMesoscale DiscussionSPCAdams, Clay, Fillmore, Franklin, Harlan, Nuckolls and 2 more91 min
May 24, 5:36 PM CDTSevere Thunderstorm WatchSPCClay, Fillmore, Nuckolls, Thayer, Webster6 hr

Nearby

Mesoscale Discussions in Iowa, 2020Mesoscale Discussions in Missouri, 2020Mesoscale Discussions in Nebraska, 2020Every mesoscale discussion in 2020

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.