Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 513

May 7, 20149 counties in Iowa; 9 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at May 7, 2014, 5:35 PM CDT for 9 counties in Iowa; 9 counties in Minnesota. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: May 7, 2014, 5:35 PM CDT (22:35 UTC)
Expired: May 7, 2014, 7:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Clay County, IA, Dickinson County, IA, Emmet County, IA, Hancock County, IA, Kossuth County, IA, Osceola County, IA, Palo Alto County, IA, Winnebago County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Waseca County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 157 km from the middle of the area, began a volume at 22:38 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.

Severe Thunderstorm Watch 126May 7, 6:45 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.6 hours before the alert went out and 156 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: 1223 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
May 7, 2:28 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Emmet, Lyon, Osceola, Palo Alto	2 hr
May 7, 6:40 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Blue Earth, Brown, Carver, Cottonwood, Dakota and 26 more	6 hr

Nearby

Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Minnesota, 2014 Every mesoscale discussion in 2014

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.