Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 13, NWS Milwaukee, WI

May 27, 20184 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at May 27, 2018, 4:19 PM CDT for 4 counties in Wisconsin. It was in force for 41 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 27, 2018, 4:19 PM CDT (21:19 UTC)
Expired: May 27, 2018, 5:00 PM CDT
In force: 41 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Dodge County, WI, Jefferson County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 30 km from the middle of the area, began a volume at 21:19 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.

What was reported inside it

Time	Report	Where	Remark
May 27, 4:26 PM CDT	TSTM WND DMG	6 Nne Lac La Belle, WI	SEVERAL LARGE BRANCHES DOWN. BRANCHES 8 TO 10 INCHES IN DIAMETER. NEAR INTERSECTION OF COUNTY P AND ROOSEVELT RD.
May 27, 4:29 PM CDT	TSTM WND DMG	4 Nnw Okauchee Lake, WI	8 INCH DIAMETER HARDWOOD TREE DOWN AT HWY P 1/2 MILE NORTH OF HWY CW. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.3 hours before the alert went out and 151 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 95 J/kg
Mixed-layer CIN: -301 J/kg
Mixed-layer LCL: 2126 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

765 
WUUS53 KMKX 272119
SVRMKX
WIC027-055-131-133-272200-
/O.NEW.KMKX.SV.W.0013.180527T2119Z-180527T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
419 PM CDT SUN MAY 27 2018

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Northern Waukesha County in southeastern Wisconsin...
  Southern Washington County in southeastern Wisconsin...
  Northeastern Jefferson County in southeastern Wisconsin...
  Southeastern Dodge County in southeastern Wisconsin...

* Until 500 PM CDT.

* At 419 PM CDT, a severe thunderstorm was located near Hartford,
  moving southeast at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Waukesha, New Berlin, Brookfield, Menomonee Falls, Hartford,
  Pewaukee, Sussex, Hartland, Delafield, Elm Grove, Okauchee Lake,
  Oconomowoc, Merton, Butler, Lannon, Lac La Belle, Richfield,
  Ixonia, Ashippun and Nashotah.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4302 8807 4296 8811 4317 8866 4335 8856
      4323 8806
TIME...MOT...LOC 2119Z 298DEG 24KT 4328 8850 

HAIL...1.00IN
WIND...60MPH
 
$$

SPM

2 follow-up statements

798 
WWUS53 KMKX 272150
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
450 PM CDT SUN MAY 27 2018

WIC027-055-131-133-272200-
/O.CON.KMKX.SV.W.0013.000000T0000Z-180527T2200Z/
Waukesha WI-Washington WI-Jefferson WI-Dodge WI-
450 PM CDT SUN MAY 27 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR NORTHERN WAUKESHA...SOUTHERN WASHINGTON...NORTHEASTERN JEFFERSON
AND SOUTHEASTERN DODGE COUNTIES...

At 450 PM CDT, a severe thunderstorm was located near Merton, or 7
miles south of Hartford, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Waukesha, New Berlin, Brookfield, Menomonee Falls, Hartford,
Pewaukee, Sussex, Hartland, Delafield, Elm Grove, Okauchee Lake,
Merton, Butler, Lannon, Lac La Belle, Richfield, Ashippun, Nashotah,
Chenequa and Neosho.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4302 8807 4296 8811 4319 8862 4335 8856
      4323 8806
TIME...MOT...LOC 2150Z 294DEG 19KT 4322 8833 

HAIL...1.00IN
WIND...60MPH
 
$$

SPM

317 
WWUS53 KMKX 272200
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
500 PM CDT SUN MAY 27 2018

WIC027-055-131-133-272210-
/O.EXP.KMKX.SV.W.0013.000000T0000Z-180527T2200Z/
Waukesha WI-Washington WI-Jefferson WI-Dodge WI-
500 PM CDT SUN MAY 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WAUKESHA...SOUTHERN
WASHINGTON...NORTHEASTERN JEFFERSON AND SOUTHEASTERN DODGE COUNTIES
HAS EXPIRED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire.  However small
hail and gusty winds are still possible with this thunderstorm.

LAT...LON 4302 8807 4296 8811 4319 8862 4335 8856
      4323 8806
TIME...MOT...LOC 2200Z 298DEG 24KT 4319 8826 

$$

SPM

The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 2:06 PM CDT	Special Weather Statement	MKX	Ozaukee	24 min
May 27, 2:38 PM CDT	Special Marine Warning	MKX		18 min
May 27, 3:10 PM CDT	Special Weather Statement	MKX	Jefferson	20 min
May 27, 3:36 PM CDT	Special Weather Statement	MKX	Ozaukee	24 min
May 27, 3:45 PM CDT	Special Weather Statement	MKX	Washington	15 min
May 27, 3:51 PM CDT	Special Weather Statement	MKX	Ozaukee	24 min
May 27, 4:13 PM CDT	Special Weather Statement	MKX	Waukesha	32 min
May 27, 4:38 PM CDT	Special Weather Statement	MKX	Milwaukee	52 min
May 27, 4:55 PM CDT	Special Weather Statement	MKX	Jefferson	35 min
May 27, 5:00 PM CDT	Special Weather Statement	MKX	Waukesha	30 min
May 27, 6:01 PM CDT	Special Weather Statement	MKX	Walworth	29 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2018 Every severe thunderstorm warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.