Alert archive / Iowa / Mesoscale Discussions in 2016
Mesoscale Discussion 441
The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2016, 8:45 PM CDT for 4 states. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2016, 8:45 PM CDT (01:45 UTC)
- Expired
- Apr 24, 2016, 9:45 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 43 counties
Adams County, IA, Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clay County, IA, Crawford County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Morris County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Saline County, KS, Shawnee County, KS, Wabaunsee County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Holt County, MO, Nodaway County, MO, Nemaha County, NE, Richardson County, NE
The radar
The Omaha radar (KOAX), 110 km from the middle of the area, began a volume at 01:47 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, 1.8 hours before the alert went out and 110 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
- 1046 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1404 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 236 m²/s²
- 0-3 km storm-relative helicity
- 338 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 16.1
The text
As transmitted.
840
ACUS11 KWNS 250145
SWOMCD
SPC MCD 250145
IAZ000-MOZ000-KSZ000-NEZ000-250245-
MESOSCALE DISCUSSION 0441
NWS STORM PREDICTION CENTER NORMAN OK
0845 PM CDT SUN APR 24 2016
AREAS AFFECTED...NORTHEAST KS TO WESTERN IA
CONCERNING...TORNADO WATCH 101...102...
VALID 250145Z - 250245Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 101...102...CONTINUES.
SUMMARY...PRIMARY SEVERE THREAT IS ORIENTING ITSELF ALONG A CORRIDOR
FROM NORTHEAST KS INTO NORTHWEST MO. LARGE HAIL WILL BECOME THE
MAIN RISK...ALTHOUGH DAMAGING WINDS ARE ALSO POSSIBLE.
DISCUSSION...EARLIER SUPERCELL ACTIVITY THAT EVOLVED ALONG THE
DRYLINE ACROSS SRN NEBRASKA AND NRN KS HAS CONGEALED INTO A SW-NE
ORIENTED BAND OF SEVERE CONVECTION OVER NERN KS. AS LLJ INCREASES
FROM NERN KS INTO SRN IA THIS DEVELOPING SQUALL LINE SHOULD
PROPAGATE EWD TOWARD THE MO RIVER. LATEST HAIL ALGORITHM SUGGESTS
HAIL GREATER THAN ONE INCH IS COMMON FROM SALINE INTO POTTAWATOMIE
COUNTY KS. AS CONVECTION SPREADS EAST OF THE MO RIVER WEAKER
INSTABILITY SHOULD LIMIT SEVERE THREAT.
..DARROW.. 04/25/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DMX...EAX...FSD...OAX...TOP...ICT...
LAT...LON 38619805 39629661 40369602 41999582 43179546 43229464
41339453 39939461 39009504 38469623 38619805SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 2:17 PM CDT | Severe Thunderstorm Watch | SPC | Clinton, Scott | 8 hr |
| Apr 25, 3:50 PM CDT | Mesoscale Discussion | SPC | Banner, Kimball, Scotts Bluff, Sioux | 115 min |
Nearby
Mesoscale Discussions in Iowa, 2016Mesoscale Discussions in Kansas, 2016Mesoscale Discussions in Missouri, 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.