Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 25, NWS Twin Cities, MN

May 16, 2017Polk County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 16, 2017, 4:01 PM CDT for Polk County, Saint Croix County, Wisconsin. It was in force for 44 min. 1 report 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 16, 2017, 4:01 PM CDT (21:01 UTC)
Expired: May 16, 2017, 4:45 PM CDT
In force: 44 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 104 km from the middle of the area, began a volume at 21:02 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 16, 4:41 PM CDT	HAIL 2.5	2 S Amery, WI

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.0 hours before the alert went out and 106 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: 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.

969 
WUUS53 KMPX 162101
SVRMPX
WIC095-109-162145-
/O.NEW.KMPX.SV.W.0025.170516T2101Z-170516T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
401 PM CDT TUE MAY 16 2017

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Northern St. Croix County in west central Wisconsin...
  Southeastern Polk County in northwestern Wisconsin...

* Until 445 PM CDT

* At 400 PM CDT, a severe thunderstorm was located near Somerset, or
  22 miles north of River Falls, moving east at 25 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees. 

* Locations impacted include...
  New Richmond, Amery, Somerset, Clear Lake, Clayton, Star Prairie,
  Forest, Cylon, Deer Park, Huntington, Range and Wanderoos.

This includes U.S. Highway 61 near mile marker 165.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 4546 9219 4528 9215 4515 9215 4511 9228
      4511 9237 4510 9237 4511 9238 4511 9267
      4525 9272
TIME...MOT...LOC 2100Z 247DEG 21KT 4518 9267 

HAIL...1.50IN
WIND...60MPH
 
$$

ETA

1 follow-up statement

910 
WWUS53 KMPX 162124
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
424 PM CDT TUE MAY 16 2017

WIC109-162133-
/O.CAN.KMPX.SV.W.0025.000000T0000Z-170516T2145Z/
St. Croix WI-
424 PM CDT TUE MAY 16 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ST. CROIX COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CDT for northwestern
and west central Wisconsin.

LAT...LON 4546 9219 4529 9215 4521 9216 4520 9248
      4521 9253 4530 9258
TIME...MOT...LOC 2123Z 247DEG 21KT 4523 9249 

$$

WIC095-162145-
/O.CON.KMPX.SV.W.0025.000000T0000Z-170516T2145Z/
Polk WI-
424 PM CDT TUE MAY 16 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHEASTERN POLK COUNTY...

At 423 PM CDT, a severe thunderstorm was located near Star Prairie,
or 26 miles north of River Falls, moving northeast at 25 mph.

HAZARD...Tennis ball size hail. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles. 

Locations impacted include...
Amery, Clear Lake, Clayton, Star Prairie, Deronda, Range, Wanderoos
and Joel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

A tornado watch remains in effect until 1000 PM CDT for northwestern
and west central Wisconsin.

LAT...LON 4546 9219 4529 9215 4521 9216 4520 9248
      4521 9253 4530 9258
TIME...MOT...LOC 2123Z 247DEG 21KT 4523 9249 

HAIL...2.50IN
WIND...<50MPH
 
$$

ETA

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 16, 2:54 PM CDT	Flash Flood Watch	MPX	Chippewa, Dunn, Eau Claire, Pepin, Pierce, Rusk	12 hr
May 16, 4:06 PM CDT	Severe Thunderstorm Warning	MPX	Pierce	39 min
May 16, 4:38 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	52 min
May 16, 4:39 PM CDT	Tornado Warning	MPX	Barron, Polk	51 min
May 16, 4:55 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Rusk	65 min
May 16, 5:05 PM CDT	Tornado Warning	MPX	Barron	55 min
May 16, 5:28 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn, Saint Croix	47 min
May 16, 5:37 PM CDT	Tornado Warning	MPX	Rusk	38 min
May 16, 6:01 PM CDT	Tornado Warning Tornado observed	MPX	Rusk	59 min
May 16, 6:10 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Chippewa, Rusk	65 min
May 16, 6:14 PM CDT	Tornado Warning	MPX	Chippewa	35 min
May 16, 6:16 PM CDT	Severe Thunderstorm Warning	MPX	Pierce	44 min
May 16, 6:58 PM CDT	Severe Thunderstorm Warning	MPX	Pepin, Pierce	47 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2017 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.