Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Milwaukee, WI

July 18, 2012Green County, Lafayette County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 18, 2012, 6:19 PM CDT for Green County, Lafayette County, Wisconsin. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 18, 2012, 6:19 PM CDT (23:19 UTC)
Expired: Jul 18, 2012, 6:45 PM CDT
In force: 26 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Green County, WI, Lafayette County, WI

The radar

The Milwaukee radar (KMKX), 109 km from the middle of the area, began a volume at 23:19 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 18, 12:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.3 hours before the alert went out and 135 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: 1900 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1674 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

039 
WUUS53 KMKX 182319
SVRMKX
WIC045-065-182345-
/O.NEW.KMKX.SV.W.0049.120718T2319Z-120718T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
619 PM CDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GREEN COUNTY IN SOUTH CENTRAL WISCONSIN...
  EASTERN LAFAYETTE COUNTY IN SOUTH CENTRAL WISCONSIN...

* UNTIL 645 PM CDT

* AT 614 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6
  MILES SOUTHEAST OF DARLINGTON...AND MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ARGYLE AND BLANCHARDVILLE AROUND 635 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE WIOTA...
SOMERS...SOUTH WAYNE...WOODFORD...JORDON CENTER AND BROWNTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4281 8996 4281 8984 4283 8984 4285 8937
      4251 8984 4251 9010
TIME...MOT...LOC 2319Z 272DEG 18KT 4265 8998
WIND...HAIL 60MPH 1.25IN

$$

CRAVEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 6:41 AM CDT	Areal Flood Advisory	MKX	Dane	3 hr
Jul 18, 5:27 PM CDT	Severe Thunderstorm Warning	MKX	Green, Rock	33 min
Jul 18, 5:34 PM CDT	Severe Thunderstorm Warning	MKX	Green, Lafayette	32 min
Jul 18, 5:36 PM CDT	Severe Thunderstorm Warning	MKX	Iowa, Sauk	39 min
Jul 18, 5:51 PM CDT	Severe Thunderstorm Warning	MKX	Rock	39 min
Jul 18, 6:03 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Green, Iowa, Sauk	42 min
Jul 18, 6:21 PM CDT	Severe Thunderstorm Warning	MKX	Rock	54 min
Jul 18, 6:41 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Dodge, Green, Iowa, Jefferson and 3 more	49 min
Jul 18, 6:43 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dodge, Sauk	62 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012 Every severe thunderstorm warning in 2012

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.