Alert archive / Iowa / Mesoscale Discussions in 2013

Mesoscale Discussion 692

May 19, 201323 counties in Iowa; 6 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 19, 2013, 1:48 AM CDT for 23 counties in Iowa; 6 counties in Missouri. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 19, 2013, 1:48 AM CDT (06:48 UTC)
Expired
May 19, 2013, 3:15 AM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 29 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Buena Vista County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Crawford County, IA, Decatur County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Montgomery County, IA, O'Brien County, IA, Page County, IA, Plymouth County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Taylor County, IA, Union County, IA, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Nodaway County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 112 km from the middle of the area, began a volume at 06:48 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, 6.8 hours before the alert went out and 117 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 2013-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1935 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 2013-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
1935 J/kg
Mixed-layer CIN
-202 J/kg
Mixed-layer LCL
1541 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 8:33 PM CDTMesoscale DiscussionSPCAdams, Cass, Cherokee, Crawford, Fremont, Harrison and 13 more117 min
May 18, 9:26 PM CDTSevere Thunderstorm WatchSPCFremont, Harrison, Lyon, Mills, Monona, Montgomery and 6 more5 hr
May 19, 11:30 AM CDTMesoscale DiscussionSPCAppanoose, Benton, Black Hawk, Boone, Bremer, Buchanan and 52 more90 min
May 19, 1:10 PM CDTTornado WatchSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 34 more8 hr
May 19, 1:47 PM CDTTornado WatchSPCFremont, Page10 hr
May 19, 2:59 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Boone and 50 more8 hr
May 19, 5:04 PM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 28 more56 min
May 18, 10:00 PM CDTMesoscale DiscussionSPCBuchanan, Cass, Clay, Jackson, Platte30 min
May 18, 10:39 PM CDTTornado WatchSPCAndrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 6 more3 hr
May 19, 12:51 PM CDTMesoscale DiscussionSPCBuchanan, Platte114 min
May 19, 5:54 PM CDTMesoscale DiscussionSPCAdair, Audrain, Barry, Barton, Bates, Benton and 48 more66 min
May 19, 6:25 PM CDTTornado WatchSPCAdair, Audrain, Barry, Barton, Bates, Benton and 55 more9 hr

Nearby

Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Missouri, 2013Every mesoscale discussion in 2013

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.