Alert archive / Iowa / Mesoscale Discussions in 2016
Mesoscale Discussion 735
The Storm Prediction Center issued this mesoscale discussion at May 25, 2016, 11:34 PM CDT for 26 counties in Iowa; 21 counties in Nebraska. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- May 25, 2016, 11:34 PM CDT (04:34 UTC)
- Expired
- May 26, 2016, 1:00 AM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 47 counties
Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mills County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Lancaster County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, York County, NE
The radar
The Omaha radar (KOAX), 75 km from the middle of the area, began a volume at 04:37 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
Omaha, NE (KOAX), launched 00:00Z, 4.6 hours before the alert went out and 75 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
- 1496 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 1029 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.9
The text
As transmitted.
945
ACUS11 KWNS 260434
SWOMCD
SPC MCD 260434
MNZ000-IAZ000-NEZ000-SDZ000-260600-
MESOSCALE DISCUSSION 0735
NWS STORM PREDICTION CENTER NORMAN OK
1134 PM CDT WED MAY 25 2016
AREAS AFFECTED...PORTIONS ERN NEB...WRN IA...EXTREME SRN MN.
CONCERNING...SEVERE THUNDERSTORM WATCH 211...
VALID 260434Z - 260600Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 211
CONTINUES.
SUMMARY...POTENTIAL FOR SPORADIC DAMAGING...ISOLATED SEVERE GUSTS
AND MARGINALLY SVR HAIL WILL PERSIST ACROSS ERN PORTIONS WW...AND
MAY SHIFT EWD ACROSS PORTIONS SERN NEB AND WRN IA DURING NEXT 2-3
HOURS. CONVECTIVE/INSTABILITY TRENDS WILL BE MONITORED FOR
POSSIBILITY OF THREAT EXTENDING E OF CURRENT WW.
DISCUSSION...BKN/WAVY SQUALL LINE IS EVIDENT AS OF 430Z FROM SWRN
CORNER OF MN TO CLAY COUNTY NEB. THOUGH GUST FRONT HAS REMAINED AS
MUCH AS 10-15 NM AHEAD OF E-CENTRAL/S-CENTRAL NEB
SEGMENT...SUFFICIENT DOWNWARD MOMENTUM TRANSFER HAS OCCURRED TO
PRODUCE ISOLATED SVR GUSTS. FOR EXAMPLE...52-KT GUST WAS MEASURED
AT HSI AT 0339Z. MOISTURE TRANSPORT AND LOW-LEVEL WAA WILL PERSIST
FOR AT LEAST A FEW MORE HOURS AHEAD OF THIS COMPLEX...ENABLING
FORCED ASCENT OF FAVORABLY BUOYANT NEAR-SFC AIR ATOP GUST FRONT AND
INTO UPDRAFTS. GRADUALLY INCREASING WARM-SECTOR SBCINH IS EXPECTED
THROUGH REMAINDER OF TONIGHT...HOWEVER MUCAPE SHOULD CONTINUE TO
RANGE FROM ABOUT 1000 J/KG OVER SRN MN TO 2500 J/KG OVER SERN
NEB...AMIDST ROUGHLY 40-KT SWLY EFFECTIVE-SHEAR VECTORS...BASED ON
MODIFIED RAOBS AND MODEL SOUNDINGS. ISOLATED SVR HAIL ALSO MAY
OCCUR WITH ANY TSTMS THAT DEVELOP BEHIND OUTFLOW BOUNDARY OVER SRN
NEB...AND ISOLATED SMALL CLUSTER OF TSTMS OVER EXTREME SRN MN.
..EDWARDS.. 05/26/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MPX...DMX...FSD...OAX...GID...
LAT...LON 40619796 41819787 42079717 42569683 42639648 43039628
43449619 43759400 42259419 40939560 40239704 40619796SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 8:36 PM CDT | Severe Thunderstorm Watch | SPC | Cherokee, Ida, Monona, O'Brien, Plymouth, Sioux and 1 more | 5 hr |
| May 26, 10:33 AM CDT | Mesoscale Discussion | SPC | Fremont, Page, Taylor | 57 min |
| May 26, 1:53 PM CDT | Tornado Watch | SPC | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 8 hr |
| May 26, 2:09 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Cass, Clarke, Dallas and 10 more | 8 hr |
| May 26, 5:27 PM CDT | Mesoscale Discussion | SPC | Fremont, Page, Taylor | 63 min |
| May 25, 7:23 PM CDT | Mesoscale Discussion | SPC | Dawson, Frontier, Furnas, Gosper, Hayes, Hitchcock and 3 more | 97 min |
| May 26, 6:46 PM CDT | Mesoscale Discussion | SPC | Dundy, Hitchcock, Red Willow | 59 min |
Nearby
Mesoscale Discussions in Iowa, 2016Mesoscale Discussions in Nebraska, 2016Every mesoscale discussion in 2016
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.