Alert archive / Iowa / Mesoscale Discussions in 2014
Mesoscale Discussion 1749
The Storm Prediction Center issued this mesoscale discussion at Sep 20, 2014, 7:25 PM CDT for 11 counties in Iowa; 10 counties in Minnesota; 11 counties in Wisconsin. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Sep 20, 2014, 7:25 PM CDT (00:25 UTC)
- Expired
- Sep 20, 2014, 8:30 PM CDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 32 counties
Allamakee County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Floyd County, IA, Hancock County, IA, Howard County, IA, Kossuth County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Clark County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Trempealeau County, WI, Vernon County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 116 km from the middle of the area, began a volume at 00:29 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 00:00Z, 0.4 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 906 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- -105 m²/s²
- 0-3 km storm-relative helicity
- -127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
195 ACUS11 KWNS 210026 SWOMCD SPC MCD 210025 WIZ000-IAZ000-MNZ000-210130- MESOSCALE DISCUSSION 1749 NWS STORM PREDICTION CENTER NORMAN OK 0725 PM CDT SAT SEP 20 2014 AREAS AFFECTED...SERN MN...NERN IA...SWRN WI CONCERNING...SEVERE THUNDERSTORM WATCH 506... VALID 210025Z - 210130Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 506 CONTINUES. SUMMARY...SEVERE THREAT IS SHIFTING SOUTHEAST ACROSS WW506. DISCUSSION...EXIT REGION OF STRONG MID-LEVEL SPEED MAX IS TRANSLATING SEWD ACROSS THE UPPER MS VALLEY TOWARD THE UPPER GREAT LAKES. STRONGEST CONVECTION REMAINS FOCUSED IMMEDIATELY AHEAD OF DIGGING VORT WHERE A LONG-LIVED SUPERCELL IS NOW MOVING INTO NRN HOWARD COUNTY IA. THIS ACTIVITY IS MOVING QUICKLY SEWD AT ROUGHLY 40-45KT AND SHOULD TRACK ACROSS EXTREME NERN IA BEFORE MOVING INTO SWRN WI...MOST LIKELY NEAR CRAWFORD COUNTY. HAIL AND GUSTY WINDS ARE EXPECTED WITH THIS FAST-MOVING CONVECTION. ..DARROW.. 09/21/2014 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...GRB...ARX...MPX...DMX... LAT...LON 42889458 44749288 44748961 42879138 42889458
Nearby
Mesoscale Discussions in Iowa, 2014Mesoscale Discussions in Wisconsin, 2014Mesoscale Discussions in Minnesota, 2014Every 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.