Alert archive / Wisconsin / Tornado Watches in 2017

Tornado Watch 222

May 16, 201730 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at May 16, 2017, 4:02 PM CDT for 30 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 16, 2017, 4:02 PM CDT (21:02 UTC)
Expired
May 16, 2017, 9:48 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 30 counties

Ashland County, WI, Barron County, WI, Bayfield County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Jackson County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Menominee County, WI, Oneida County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 126 km from the middle of the area, began a volume at 21:03 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

36 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 16, 4:06 PM CDTSevere Thunderstorm WarningMPXPierce39 min
May 16, 4:38 PM CDTSevere Thunderstorm WarningMPXSaint Croix52 min
May 16, 4:39 PM CDTTornado WarningMPXBarron, Polk51 min
May 16, 4:55 PM CDTSevere Thunderstorm WarningMPXBarron, Rusk65 min
May 16, 5:05 PM CDTTornado WarningMPXBarron55 min
May 16, 5:25 PM CDTSevere Thunderstorm WarningDLHBurnett, Washburn34 min
May 16, 5:28 PM CDTSevere Thunderstorm WarningMPXBarron, Dunn, Saint Croix47 min
May 16, 5:37 PM CDTTornado WarningMPXRusk38 min
May 16, 5:53 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Sawyer37 min
May 16, 6:01 PM CDTTornado Warning Tornado observedMPXRusk59 min
May 16, 6:10 PM CDTSevere Thunderstorm WarningMPXBarron, Chippewa, Rusk65 min
May 16, 6:14 PM CDTTornado WarningMPXChippewa35 min
May 16, 6:16 PM CDTSevere Thunderstorm WarningMPXPierce44 min
May 16, 6:27 PM CDTSevere Thunderstorm WarningDLHAshland, Iron33 min
May 16, 6:42 PM CDTSevere Thunderstorm WarningARXTaylor78 min
May 16, 6:47 PM CDTSevere Thunderstorm WarningDLHBayfield, Douglas, Sawyer, Washburn43 min
May 16, 6:48 PM CDTTornado Warning Tornado observedDLHPrice42 min
May 16, 6:58 PM CDTSevere Thunderstorm WarningMPXPepin, Pierce47 min
May 16, 7:09 PM CDTSevere Thunderstorm WarningGRBLincoln51 min
May 16, 7:15 PM CDTSevere Thunderstorm WarningGRBOneida75 min
May 16, 7:16 PM CDTSevere Thunderstorm WarningARXBuffalo44 min
May 16, 7:30 PM CDTTornado WarningDLHPrice15 min
May 16, 7:35 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield25 min
May 16, 7:37 PM CDTTornado WarningDLHPrice8 min
May 16, 7:43 PM CDTTornado WarningGRBLincoln47 min
May 16, 7:47 PM CDTSevere Thunderstorm WarningARXTrempealeau28 min
May 16, 7:49 PM CDTTornado WarningDLHPrice11 min
May 16, 8:22 PM CDTTornado WarningGRBLanglade, Lincoln38 min
May 16, 8:31 PM CDTSevere Thunderstorm WarningGRBFlorence, Forest, Oneida44 min
May 16, 8:38 PM CDTSevere Thunderstorm WarningARXBuffalo, Trempealeau52 min
May 16, 8:47 PM CDTSevere Thunderstorm WarningARXClark, Taylor28 min
May 16, 8:47 PM CDTSevere Thunderstorm WarningGRBLincoln, Marathon58 min
May 16, 8:53 PM CDTSevere Thunderstorm WarningARXBuffalo52 min
May 16, 9:33 PM CDTSevere Thunderstorm WarningARXBuffalo, Trempealeau72 min
May 16, 9:43 PM CDTSevere Thunderstorm WarningGRBLanglade, Lincoln, Marathon, Shawano47 min
May 16, 9:44 PM CDTFlash Flood WarningARXBuffalo, Trempealeau4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.0 hours before the alert went out and 221 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2017-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 241 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2017-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
241 J/kg
Mixed-layer CIN
-181 J/kg
Mixed-layer LCL
1186 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.3

Open this sounding in Storm Lab

The text

As transmitted.

073 
WWUS20 KWNS 162059
SEL2  
SPC WW 162059
WIZ000-LSZ000-170300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 222
NWS Storm Prediction Center Norman OK
400 PM CDT Tue May 16 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northern Wisconsin
  Lake Superior

* Effective this Tuesday afternoon and evening from 400 PM until
  1000 PM CDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered large hail likely with isolated very large hail events
    to 2 inches in diameter possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Thunderstorms developing over eastern MN will track across
the watch area and pose a risk of large hail and isolated tornadoes.

The tornado watch area is approximately along and 75 statute miles
north and south of a line from 75 miles northwest of Eau Claire WI
to 20 miles northeast of Rhinelander WI. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 220...WW 221...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 26030.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 16, 6:25 PM CDTMesoscale DiscussionSPCGogebic, Iron65 min
May 15, 7:19 PM CDTMesoscale DiscussionSPCCrawford, Dane, Grant, Green, Iowa, Lafayette and 4 more56 min
May 15, 7:52 PM CDTSevere Thunderstorm WatchSPCDane, Green, Iowa, Jefferson, Kenosha, Lafayette and 3 more3 hr
May 15, 9:48 PM CDTSevere Thunderstorm WatchSPCBuffalo, Crawford, Jackson, La Crosse, Monroe, Pepin and 4 more5 hr
May 15, 10:14 PM CDTMesoscale DiscussionSPCJefferson, Kenosha, Rock, Walworth, Waukesha61 min
May 16, 2:13 AM CDTMesoscale DiscussionSPCBuffalo, La Crosse, Trempealeau92 min
May 16, 12:57 PM CDTMesoscale DiscussionSPCBuffalo, Clark, Eau Claire, Jackson, Marathon, Menominee and 7 more2 hr
May 16, 3:32 PM CDTMesoscale DiscussionSPCAdams, Barron, Buffalo, Burnett, Calumet, Chippewa and 33 more88 min

Nearby

Tornado Watches in Wisconsin, 2017Every tornado watch in 2017

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.