Alert archive / Iowa / Mesoscale Discussions in 2019

Mesoscale Discussion 832

May 27, 2019Howard County, Mitchell County, Winneshiek County, Iowa; Dodge County, Fillmore County, Mower County, Minnesota

The Storm Prediction Center issued this mesoscale discussion at May 27, 2019, 1:18 PM CDT for Howard County, Mitchell County, Winneshiek County, Iowa; Dodge County, Fillmore County, Mower County, Minnesota. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 27, 2019, 1:18 PM CDT (18:18 UTC)
Expired: May 27, 2019, 2:15 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Mower County, MN

The radar

The La Crosse radar (KARX), 117 km from the middle of the area, began a volume at 18:18 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

Minneapolis, MN (KMPX), launched 12:00Z, 6.3 hours before the alert went out and 158 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: 961 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 220 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, 2:41 AM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills, Montgomery, Page	4 hr
May 27, 12:50 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Henry, Jackson, Johnson and 5 more	85 min
May 27, 1:22 PM CDT	Tornado Watch	SPC	Clinton, Des Moines, Henry, Lee, Louisa, Muscatine and 1 more	9 hr
May 27, 3:57 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Henry, Lee, Louisa and 2 more	93 min

Nearby

Mesoscale Discussions in Iowa, 2019 Mesoscale Discussions in Minnesota, 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.