Alert archive / Wisconsin / Mesoscale Discussions in 2011
Mesoscale Discussion 2018
The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2011, 1:51 PM CDT for 22 counties in Wisconsin. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Aug 19, 2011, 1:51 PM CDT (18:51 UTC)
- Expired
- Aug 19, 2011, 2:45 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 22 counties
Adams County, WI, Clark County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Menominee County, WI, Monroe County, WI, Oneida County, WI, Portage County, WI, Price County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI, Waupaca County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 164 km from the middle of the area, began a volume at 18:54 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.9 hours before the alert went out and 170 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
- 123 J/kg
- Mixed-layer CIN
- -204 J/kg
- Mixed-layer LCL
- 1324 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
925
ACUS11 KWNS 191851
SWOMCD
SPC MCD 191851
WIZ000-MIZ000-191945-
MESOSCALE DISCUSSION 2018
NWS STORM PREDICTION CENTER NORMAN OK
0151 PM CDT FRI AUG 19 2011
AREAS AFFECTED...N-CNTRL AND W-CNTRL WI...PORTIONS OF WRN U.P. OF
MICHIGAN
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 191851Z - 191945Z
AN INCREASE IN TSTM COVERAGE IS ANTICIPATED OVER THE NEXT FEW
HRS...WITH AN ACCOMPANYING THREAT OF ISOLATED SVR HAIL AND WINDS
POSSIBLE WITH THE STRONGEST STORMS. A WW IS NOT CURRENTLY
ANTICIPATED.
LATEST VISIBLE IMAGERY INDICATES AN INCREASE IN AGITATED CU/TCU
ACROSS PORTIONS OF N-CNTRL WI. THIS IS OCCURRING ALONG/AHEAD OF A
EWD MOVING SFC COLD FRONT...POSITIONED FROM APPROXIMATELY 20 S ASX
TO 30 E MSP PER 18Z SUBJECTIVE ANALYSIS...WHILE AN APPARENT
PRE-FRONTAL WIND SHIFT IS OBSERVED IMMEDIATELY TO THE E. THE AIR
MASS AHEAD OF THE COLD FRONT HAS RECOVERED SUFFICIENTLY IN THE WAKE
OF AN EARLY MORNING MCS...AND AS CLOUD COVER HAS
ERODED...TEMPERATURES HAVE WARMED INTO THE 70S. INSTABILITY AXIS
EXTENDS FROM W-CNTRL TO N-CNTRL WI WHERE MLCAPE VALUES ARE CURRENTLY
APPROACHING 2000 J/KG...WITH SFC DEW POINTS IN THE 60S AND
MODERATELY STEEP MIDLEVEL LAPSE RATES /6-7 DEG C PER KM/ IN PLACE.
MIDLEVEL FLOW AROUND 40 KTS SHOULD SUPPORT SOME TSTM
ORGANIZATION...BUT NEARLY UNIDIRECTIONAL VERTICAL WIND PROFILES WILL
LIKELY LIMIT EFFECTIVE BULK SHEAR MAGNITUDES. NONETHELESS...AN
ISOLATED THREAT FOR HAIL AND DMGG WINDS MAY MATERIALIZE WITH THE
STRONGEST STORMS...WITH THE PRIMARY FACTORS PRECLUDING A MORE
WIDESPREAD THREAT BEING THE ABSENCE OF STRONGER FORCED
ASCENT...MODEST EFFECTIVE SHEAR...AND MODERATE INSTABILITY.
..ROGERS.. 08/19/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MQT...GRB...DLH...ARX...MPX...
LAT...LON 46318956 46189002 44849132 44529175 44499175 44209157
43789112 43659056 44058942 44608877 45738815 46158875
46208890 46318956Nearby
Mesoscale Discussions in Wisconsin, 2011Every mesoscale discussion in 2011
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.