Alert archive / Iowa / Mesoscale Discussions in 2019

Mesoscale Discussion 856

May 28, 20194 states

The Storm Prediction Center issued this mesoscale discussion at May 28, 2019, 2:55 PM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: May 28, 2019, 2:55 PM CDT (19:55 UTC)
Expired: May 28, 2019, 4:30 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 35 counties

Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Jasper County, IA, Jefferson County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Page County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Brown County, KS, Nemaha County, KS, Andrew County, MO, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Worth County, MO, Nemaha County, NE, Richardson County, NE

The radar

The Des Moines radar (KDMX), 125 km from the middle of the area, began a volume at 19:59 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.9 hours before the alert went out and 202 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: -237 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
May 27, 10:55 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more	7 hr
May 27, 11:42 PM CDT	Mesoscale Discussion	SPC	Fremont, Mills, Montgomery, Page, Taylor	63 min
May 28, 1:23 AM CDT	Mesoscale Discussion	SPC	Adams, Appanoose, Clarke, Davis, Decatur, Des Moines and 12 more	2 hr
May 28, 4:58 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Clarke, Dallas and 14 more	2 hr
May 28, 6:09 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Cass, Clarke, Dallas and 17 more	5 hr
May 28, 7:44 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Clarke, Dallas and 17 more	2 hr
May 28, 9:42 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 16 more	93 min
May 28, 11:31 AM CDT	Mesoscale Discussion	SPC	Davis, Des Moines, Lee, Van Buren	89 min
May 28, 3:13 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Appanoose, Clarke, Davis, Decatur, Fremont and 15 more	7 hr
May 28, 5:12 PM CDT	Mesoscale Discussion	SPC	Decatur, Wayne	93 min
May 28, 5:22 PM CDT	Severe Thunderstorm Watch	SPC	Des Moines, Henry, Jefferson, Johnson, Lee, Louisa and 4 more	5 hr
May 27, 7:34 PM CDT	Mesoscale Discussion	SPC	Clay, Cloud, Ellis, Graham, Jewell, Lane and 13 more	56 min
May 27, 8:02 PM CDT	Severe Thunderstorm Watch	SPC	Jewell, Mitchell, Osborne, Phillips, Rooks, Smith	6 hr
May 28, 1:55 AM CDT	Severe Thunderstorm Watch	SPC	Decatur, Norton, Rawlins	4 hr
May 28, 9:39 AM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clay, Cloud, Comanche, Dickinson and 19 more	96 min
May 28, 12:04 PM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Brown, Chase, Coffey, Dickinson and 20 more	86 min
May 28, 1:56 PM CDT	Tornado Watch	SPC	Anderson, Atchison, Clay, Cloud, Coffey, Dickinson and 21 more	8 hr
May 28, 2:02 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Butler, Chase, Cowley, Elk and 13 more	88 min
May 28, 2:52 PM CDT	Tornado Watch	SPC	Barton, Butler, Chase, Chautauqua, Cowley, Elk and 14 more	7 hr
May 28, 3:23 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Ellis, Gove, Graham, Greeley and 15 more	3 hr
May 28, 4:03 PM CDT	Severe Thunderstorm Watch	SPC	Ellis, Gove, Graham, Greeley, Lane, Logan and 8 more	5 hr
May 28, 5:33 PM CDT	Mesoscale Discussion	SPC	Butler, Chase, Clay, Cloud, Cowley, Dickinson and 13 more	87 min
May 28, 5:38 PM CDT	Tornado Watch	SPC	Jewell, Mitchell, Osborne, Phillips, Rooks, Smith	3 hr
May 28, 6:26 PM CDT	Mesoscale Discussion	SPC	Clay, Cloud, Jewell, Mitchell, Republic, Washington	94 min
May 28, 12:01 PM CDT	Severe Thunderstorm Watch	SPC	Knox, Lewis, Marion, Monroe, Pike, Ralls and 1 more	5 hr
May 28, 3:58 PM CDT	Mesoscale Discussion	SPC	Knox, Lewis, Marion, Monroe, Ralls, Shelby	62 min
May 27, 8:47 PM CDT	Mesoscale Discussion	SPC	Arthur, Buffalo, Chase, Custer, Dawson, Dundy and 13 more	118 min

Nearby

Mesoscale Discussions in Iowa, 2019 Mesoscale Discussions in Missouri, 2019 Mesoscale Discussions in Kansas, 2019 Every mesoscale discussion in 2019

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.