Alert archive / Iowa / Mesoscale Discussions in 2012
Mesoscale Discussion 1341
The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2012, 3:35 PM CDT for 19 counties in Iowa; 17 counties in Minnesota. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2012, 3:35 PM CDT (20:35 UTC)
- Expired
- Jul 1, 2012, 4:30 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 36 counties
Buena Vista County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Franklin County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Webster County, IA, Winnebago County, IA, Wright County, IA, Blue Earth County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Faribault County, MN, Jackson County, MN, Kandiyohi County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Redwood County, MN, Renville County, MN, Sibley County, MN, Watonwan County, MN
The radar
The Sioux Falls radar (KFSD), 151 km from the middle of the area, began a volume at 20:39 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, 8.6 hours before the alert went out and 196 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.
- Mixed-layer CAPE
- 1200 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1457 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
037 ACUS11 KWNS 012036 SWOMCD SPC MCD 012035 IAZ000-MNZ000-012130- MESOSCALE DISCUSSION 1341 NWS STORM PREDICTION CENTER NORMAN OK 0335 PM CDT SUN JUL 01 2012 AREAS AFFECTED...NW AND N-CNTRL IA / SWRN MN CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 012035Z - 012130Z PROBABILITY OF WATCH ISSUANCE...40 PERCENT SUMMARY...AN ISOLD LARGE HAIL/STRONG TO SEVERE WIND THREAT SHOULD PERSIST THIS AFTERNOON INTO THE EARLY EVENING OVER SWRN MN AND MAY POSSIBLY DEVELOP FARTHER S OVER PORTIONS OF NRN IA -- CONTINGENT UPON ROBUST STORM DEVELOPMENT. DISCUSSION...LATEST SURFACE MESOANALYSIS PLACES A SLOWLY RETREATING FRONTAL ZONE ACROSS NRN IA EXTENDING WNWWD INTO SWRN MN AND ERN SD. A FEW STORMS HAVE DEVELOPED OVER THE PAST FEW HOURS NEAR THE FRONT IN SWRN MN WITHIN A CU FIELD. A REMNANT MCV IS LOCATED NEAR SUX BUT UNCERTAINTY REMAINS REGARDING ITS ROLE IN PROMOTING ISOLD STORM INITIATION AND SUBSEQUENT ROBUST UPDRAFT DEVELOPMENT IN LOCALES FARTHER S ACROSS NWRN AND N-CNTRL IA. IN THE MEANTIME...STRONG POTENTIAL INSTABILITY /3000 J/KG MLCAPE PER OBJECTIVE ANALYSIS/ INVOF THE FRONT WILL ACT TO AT LEAST SUPPORT STRONG TO SEVERE MULTICELLS CAPABLE OF A LARGE HAIL/WIND DAMAGE THREAT. ..SMITH/THOMPSON.. 07/01/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MPX...DMX...FSD... LAT...LON 42129498 42749613 45079572 45299454 42739294 42129498
Nearby
Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Minnesota, 2012Every mesoscale discussion in 2012
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.