Alert archive / Iowa / Mesoscale Discussions in 2022

Mesoscale Discussion 973

May 30, 202226 counties in Iowa; 5 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 30, 2022, 5:40 AM CDT for 26 counties in Iowa; 5 counties in Nebraska. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
May 30, 2022, 5:40 AM CDT (10:40 UTC)
Expired
May 30, 2022, 7:15 AM CDT
In force
95 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 290
All 31 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Greene 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, Palo Alto County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Webster County, IA, Woodbury County, IA, Cass County, NE, Douglas County, NE, Otoe County, NE, Sarpy County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 116 km from the middle of the area, began a volume at 10:41 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 00:00Z, 10.7 hours before the alert went out and 116 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 00:00Z on 2022-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2423 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 00:00Z on 2022-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 233 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
2423 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1668 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
233 m²/s²
0-3 km storm-relative helicity
283 m²/s²
Significant tornado parameter
1.0
Supercell composite
19.2

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 29, 11:25 PM CDTMesoscale DiscussionSPCLyon, Osceola, Sioux95 min
May 30, 12:03 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 9 more8 hr
May 30, 2:21 AM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Lyon and 5 more84 min
May 30, 9:27 AM CDTMesoscale DiscussionSPCLyon, O'Brien, Osceola, Plymouth, Sioux93 min
May 30, 11:28 AM CDTMesoscale DiscussionSPCLyon, Osceola, Plymouth, Sioux92 min
May 30, 11:49 AM CDTTornado WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more6 hr
May 30, 1:34 PM CDTMesoscale DiscussionSPCCherokee, Clay, Dickinson, Ida, Lyon, Monona and 5 more86 min
May 30, 1:55 PM CDTMesoscale DiscussionSPCAdams, Audubon, Cass, Crawford, Fremont, Harrison and 6 more2 hr
May 30, 5:23 PM CDTTornado WatchSPCAdair, Adams, Audubon, Boone, Calhoun, Carroll and 36 more5 hr
May 30, 6:51 PM CDTMesoscale DiscussionSPCDickinson, Osceola54 min
May 29, 7:16 PM CDTTornado WatchSPCAdams, Antelope, Blaine, Boone, Boyd, Brown and 45 more8 hr
May 29, 9:16 PM CDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Boyd, Brown and 43 more89 min
May 30, 2:03 PM CDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Keya Paha, Loup, Rock87 min

Nearby

Mesoscale Discussions in Iowa, 2022Mesoscale Discussions in Nebraska, 2022Every mesoscale discussion in 2022

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.