Alert archive / Wisconsin / Mesoscale Discussions in 2016
Mesoscale Discussion 1561
The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2016, 7:41 PM CDT for 4 counties in Illinois; 9 counties in Iowa; 16 counties in Wisconsin. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2016, 7:41 PM CDT (00:41 UTC)
- Expired
- Aug 18, 2016, 9:15 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 29 counties
Allamakee County, IA, Bremer County, IA, Buchanan County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL, Winnebago County, IL, Adams County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 93 km from the middle of the area, began a volume at 00:44 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
Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 160 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
- 2258 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1216 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
607
ACUS11 KWNS 190041
SWOMCD
SPC MCD 190041
WIZ000-ILZ000-IAZ000-190215-
MESOSCALE DISCUSSION 1561
NWS STORM PREDICTION CENTER NORMAN OK
0741 PM CDT THU AUG 18 2016
AREAS AFFECTED...SRN WI...NERN IA...NWRN IL
CONCERNING...SEVERE THUNDERSTORM WATCH 450...451...
VALID 190041Z - 190215Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
450...451...CONTINUES.
SUMMARY...AN ISOLATED DAMAGING WIND RISK CONTINUES WITH THE
CONVECTIVE SYSTEM MOVING INTO SOUTHERN WI/NORTHEAST IA. OTHER
ISOLATED STORMS ACROSS NORTHWEST IL WILL BE CAPABLE OF LOCALLY
SEVERE HAIL. ADDITIONAL WATCH ISSUANCE BEYOND THE CONFINES OF WW
450/451 IS NOT ANTICIPATED.
DISCUSSION...AT 0030Z...A BOWING THUNDERSTORM CLUSTER CONTINUES
MOVING ESEWD ACROSS NERN IA/SWRN WI. SOME WEAKENING HAS BEEN
NOTED...LIKELY DUE TO INCREASINGLY WEAK VERTICAL SHEAR /AS NOTED IN
00Z DVN SOUNDING/ AND THE ONSET OF DIURNAL BOUNDARY-LAYER
DESTABILIZATION. HOWEVER...A LOCAL DAMAGING WIND RISK WILL CONTINUE
FOR ANOTHER 1-2 HOURS IN AREAS ALONG THE LEADING EDGE OF THE COLD
POOL WHERE VIGOROUS CONVECTION REMAINS.
AN ADDITIONAL STRONG ISOLATED STORM HAS DEVELOPED ACROSS NWRN IL.
WEAK VERTICAL SHEAR SHOULD LIMIT THE LONGEVITY OF THIS STORM...BUT A
LOCALIZED HAIL AND DOWNBURST RISK WILL EXIST WITH THIS STORM AND ANY
OTHER CELLS THAT DEVELOP AHEAD OF THE MAIN CONVECTIVE SYSTEM...GIVEN
STRONG BUOYANCY THAT IS IN PLACE. IN ADDITION...THE WEAKENING
CONVECTIVE SYSTEM TO THE NORTH WILL MOVE INTO PORTIONS OF ERN
IA/NWRN IL SOUTH OF WW 450/451 BETWEEN 01-02Z...WITH SOME POTENTIAL
FOR LOCALLY STRONG WIND GUSTS. HOWEVER...ADDITIONAL WATCH ISSUANCE
IS NOT CURRENTLY ANTICIPATED GIVEN THE INCREASINGLY MARGINAL NATURE
OF THE THREAT.
..DEAN/GRAMS.. 08/19/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GRB...LOT...MKX...DVN...ARX...DMX...
LAT...LON 43009276 43369162 43479113 44019125 44119067 44198982
43888932 43028895 42498902 42168916 41918964 42019045
42409213 42659268 43009276SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 7:23 PM CDT | Severe Thunderstorm Watch | SPC | Lyon, Osceola | 4 hr |
| Aug 18, 9:36 PM CDT | Mesoscale Discussion | SPC | Dickinson, Lyon, Osceola | 84 min |
Nearby
Mesoscale Discussions in Wisconsin, 2016Mesoscale Discussions in Iowa, 2016Mesoscale Discussions in Illinois, 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.