Alert archive / Iowa / Mesoscale Discussions in 2012
Mesoscale Discussion 727
The Storm Prediction Center issued this mesoscale discussion at May 6, 2012, 2:12 AM CDT for 23 counties in Iowa; 9 counties in Minnesota. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2012, 2:12 AM CDT (07:12 UTC)
- Expired
- May 6, 2012, 3:15 AM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 32 counties
Buena Vista County, IA, Butler County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Mitchell County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sioux County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN
The radar
The Des Moines radar (KDMX), 170 km from the middle of the area, began a volume at 07:16 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, 7.2 hours before the alert went out and 186 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
- 850 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
023
ACUS11 KWNS 060713
SWOMCD
SPC MCD 060712
IAZ000-MNZ000-060815-
MESOSCALE DISCUSSION 0727
NWS STORM PREDICTION CENTER NORMAN OK
0212 AM CDT SUN MAY 06 2012
AREAS AFFECTED...NRN IA...SRN MN
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 060712Z - 060815Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...STORMS WILL PERSIST OVER NRN IA AND SRN MN WITH MARGINALLY
SEVERE HAIL OR WIND LIKELY. THE NEED FOR A WATCH IS BEING
CONSIDERED.
DISCUSSION...THE CNTRL MN COMPLEX HAS LAID DOWN AN OUTFLOW BOUNDARY
OVER SERN MN...TRAILING SWWD INTO WRN IA AND ERN NEB WHERE ANOTHER
BOUNDARY WAS INTERSECTING THIS ONE...RESULTING IN VIGOROUS
CONVECTION ACROSS NWRN IA. WITH AMPLE THETA-E AHEAD OF THESE
STORMS...DEEP LAYER SHEAR WILL REMAIN FAVORABLE FOR SOME SEVERE WIND
AND HAIL.
..JEWELL.. 05/06/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ARX...MPX...DMX...FSD...
LAT...LON 42599292 42339595 42499615 43009621 43379632 43779544
44109422 44189373 43989282 43459245 43149245 43009250
42599292SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 10:03 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more | 7 hr |
| May 5, 11:31 PM CDT | Mesoscale Discussion | SPC | Lyon | 89 min |
| May 6, 4:55 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Cass, Fremont, Guthrie and 8 more | 2 hr |
| May 6, 7:17 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Clarke, Dallas, Davis and 16 more | 6 hr |
| May 6, 8:40 AM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Des Moines, Henry, Iowa, Jefferson and 9 more | 65 min |
| May 6, 9:29 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Cedar, Clinton, Des Moines, Henry, Iowa and 12 more | 4 hr |
| May 6, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | Des Moines, Henry, Lee, Louisa, Van Buren | 7 hr |
| May 6, 3:56 PM CDT | Mesoscale Discussion | SPC | Lee | 64 min |
| May 5, 8:18 PM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Chippewa, Lac qui Parle, Pope, Stevens, Swift and 2 more | 4 hr |
| May 5, 9:51 PM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Big Stone, Blue Earth, Brown, Carver and 29 more | 84 min |
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.