Alert archive / Wisconsin / Tornado Warnings in 2015

Tornado Warning 9, NWS Milwaukee, WI

September 17, 2015Lafayette County, Wisconsin

NWS Milwaukee, WI issued this tornado warning at Sep 17, 2015, 7:45 PM CDT for Lafayette County, Wisconsin. It was in force for 15 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: Sep 17, 2015, 7:45 PM CDT (00:45 UTC)
Expired: Sep 17, 2015, 8:00 PM CDT
In force: 15 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Lafayette County, WI

The radar

The Quad Cities radar (KDVN), 118 km from the middle of the area, began a volume at 00:46 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, 0.8 hours before the alert went out and 115 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: 1343 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1492 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 495 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 15.7

Open this sounding in Storm Lab

The text

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

260 
WFUS53 KMKX 180045
TORMKX
WIC065-180100-
/O.NEW.KMKX.TO.W.0009.150918T0045Z-150918T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
745 PM CDT THU SEP 17 2015

THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN LAFAYETTE COUNTY IN SOUTH CENTRAL WISCONSIN...

* UNTIL 800 PM CDT
    
* AT 744 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR WARREN...OR 9 MILES SOUTHEAST OF
  DARLINGTON...MOVING NORTHEAST AT 40 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THIS DANGEROUS STORM WILL BE NEAR...
  ARGYLE AROUND 800 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
WIOTA...GRATIOT...SOUTH WAYNE...SOMERS AND WOODFORD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4251 9007 4258 9013 4280 8984 4251 8984
TIME...MOT...LOC 0044Z 236DEG 37KT 4257 9002 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 7:48 PM CDT	Severe Thunderstorm Warning	MKX	Lafayette	27 min
Sep 17, 7:51 PM CDT	Severe Thunderstorm Warning	MKX	Jefferson, Rock, Walworth	24 min
Sep 17, 7:57 PM CDT	Tornado Warning	MKX	Green, Lafayette	33 min
Sep 17, 8:20 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Green, Lafayette	25 min
Sep 17, 8:40 PM CDT	Severe Thunderstorm Warning	MKX	Green	35 min
Sep 17, 8:49 PM CDT	Areal Flood Advisory	MKX	Dane, Jefferson	3 hr
Sep 17, 9:11 PM CDT	Flash Flood Warning	MKX	Jefferson	3 hr
Sep 17, 9:15 PM CDT	Severe Thunderstorm Warning	MKX	Green, Rock	45 min
Sep 17, 10:01 PM CDT	Flash Flood Warning	MKX	Jefferson, Kenosha, Racine, Walworth, Waukesha	3 hr
Sep 17, 10:49 PM CDT	Flash Flood Warning	MKX	Kenosha	3 hr
Sep 17, 11:34 PM CDT	Areal Flood Advisory	MKX	Green, Rock	116 min
Sep 17, 11:41 PM CDT	Special Marine Warning	MKX		94 min
Sep 18, 3:51 AM CDT	Flash Flood Watch	MKX	Dane, Green, Jefferson, Kenosha, Lafayette, Milwaukee and 4 more	23 hr
Sep 18, 5:15 AM CDT	Small Craft Advisory	MKX		35 hr

Nearby

Tornado Warnings in Wisconsin, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.