Alert archive / Iowa / Mesoscale Discussions in 2005
Mesoscale Discussion 749
The Storm Prediction Center issued this mesoscale discussion at May 6, 2005, 6:24 PM CDT for 13 counties in Iowa; 8 counties in Minnesota; 12 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 6, 2005, 6:24 PM CDT (23:24 UTC)
- Expired
- May 6, 2005, 8:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 33 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Humboldt County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Brookings County, SD, Hamlin County, SD, Hanson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD
The radar
The Sioux Falls radar (KFSD), 27 km from the middle of the area, began a volume at 23:27 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
Aberdeen, SD (KABR), launched 12:00Z, 11.4 hours before the alert went out and 201 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
- 2310 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -46 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 062324 SWOMCD SPC MCD 062324 IAZ000-MNZ000-SDZ000-070130- MESOSCALE DISCUSSION 0749 NWS STORM PREDICTION CENTER NORMAN OK 0624 PM CDT FRI MAY 06 2005 AREAS AFFECTED...SE SD...NW IA...NE NEB...SW MN CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 062324Z - 070130Z ISOLATED STRONG/SEVERE STORMS HAVE RECENTLY DEVELOPED SOUTH OF SIOUX FALLS SD. THIS APPEARS TO BE IN IMMEDIATE VICINITY OF SURFACE FRONTAL ZONE...WHICH IS BECOMING QUASI-STATIONARY ACROSS THE MID MISSOURI VALLEY. UNCERTAINTY EXISTS CONCERNING LONGEVITY OF THIS ACTIVITY...WITH ONSET OF SURFACE COOLING AND INCREASING INHIBITION FOR SURFACE-BASED PARCELS BY 01-02Z. NOCTURNAL STRENGTHENING/ VEERING OF CENTRAL PLAINS LOW-LEVEL JET SEEMS TO PROVIDE BETTER POTENTIAL FOR MORE EXTENSIVE CONVECTIVE DEVELOPMENT JUST NORTH OF FRONT. IF THIS OCCURS...IT MAY NOT BE UNTIL 03-06Z TIME FRAME. IN THE SHORT TERM....ISOLATED LARGE HAIL APPEARS PRIMARY SEVERE THREAT IN WEAK TO MODERATELY SHEARED ENVIRONMENT WITH CAPE IN EXCESS OF 1000 J/KG. ..KERR.. 05/06/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MPX...DMX...FSD...ABR... 44189846 44739774 44669667 44039479 43149402 42429409 42809611 43469783
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 3:41 PM CDT | Mesoscale Discussion | SPC | Bennett, Butte, Custer, Fall River, Haakon, Jackson and 9 more | 2 hr |
| May 6, 5:42 PM CDT | Mesoscale Discussion | SPC | Bennett, Custer, Fall River, Haakon, Jackson, Lawrence and 4 more | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in South Dakota, 2005Mesoscale Discussions in Minnesota, 2005Every mesoscale discussion in 2005
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.