Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 27, NWS Twin Cities, MN

May 16, 2017Washington County, Minnesota; Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 16, 2017, 4:38 PM CDT for Washington County, Minnesota; Saint Croix County, Wisconsin. It was in force for 52 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 16, 2017, 4:38 PM CDT (21:38 UTC)
Expired: May 16, 2017, 5:30 PM CDT
In force: 52 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Washington County, MN, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 79 km from the middle of the area, began a volume at 21:40 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, 4:45 PM CDT	HAIL 1	Woodbury, MN	REPORTED VIA TWITTER.
May 16, 4:50 PM CDT	HAIL 1	Bayport, MN	TIME WAS ESTIMATED. REPORTED VIA TWITTER.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
May 16, 4:08 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
May 16, 4:02 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.6 hours before the alert went out and 82 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.

390 
WUUS53 KMPX 162138
SVRMPX
MNC163-WIC109-162230-
/O.NEW.KMPX.SV.W.0027.170516T2138Z-170516T2230Z/

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

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southern Washington County in east central Minnesota...
  Western St. Croix County in west central Wisconsin...

* Until 530 PM CDT

* At 437 PM CDT, a severe thunderstorm was located over Afton, or 10
  miles northwest of River Falls, moving northeast at 25 mph.

  HAZARD...Golf ball size hail. 

  SOURCE...Trained weather spotters. 

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

* Locations impacted include...
  River Falls, Woodbury, Oakdale, Stillwater, Hudson, New Richmond,
  Lake Elmo, North Hudson, Bayport, Afton, Somerset and Baldwin.

This includes Interstate 94 in Wisconsin between mile markers 1 and
19.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

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

LAT...LON 4503 9238 4492 9238 4487 9293 4496 9296
      4521 9260 4521 9255
TIME...MOT...LOC 2137Z 240DEG 23KT 4493 9281 

HAIL...1.75IN
WIND...<50MPH
 
$$

ETA

1 follow-up statement

557 
WWUS53 KMPX 162200
SVSMPX

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

MNC163-162209-
/O.CAN.KMPX.SV.W.0027.000000T0000Z-170516T2230Z/
Washington MN-
500 PM CDT TUE MAY 16 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WASHINGTON 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 west central
Wisconsin.

A severe thunderstorm watch remains in effect until 1000 PM CDT for
east central Minnesota.

LAT...LON 4503 9238 4492 9238 4488 9278 4494 9275
      4497 9277 4503 9276 4506 9280 4507 9280
      4521 9260 4521 9255
TIME...MOT...LOC 2159Z 240DEG 23KT 4500 9263 

$$

WIC109-162230-
/O.CON.KMPX.SV.W.0027.000000T0000Z-170516T2230Z/
St. Croix WI-
500 PM CDT TUE MAY 16 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR WESTERN ST. CROIX COUNTY...

At 459 PM CDT, a severe thunderstorm was located over Burkhardt, or
10 miles north of River Falls, moving northeast at 25 mph.

HAZARD...Ping pong ball size hail. 

SOURCE...Trained weather spotters. 

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

Locations impacted include...
River Falls, Hudson, New Richmond, North Hudson, Afton, Somerset,
Baldwin, Hammond, Roberts, Star Prairie, Lakeland and Boardman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

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

LAT...LON 4503 9238 4492 9238 4488 9278 4494 9275
      4497 9277 4503 9276 4506 9280 4507 9280
      4521 9260 4521 9255
TIME...MOT...LOC 2159Z 240DEG 23KT 4500 9263 

HAIL...1.50IN
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 15, 8:53 PM CDT	Special Weather Statement	MPX	Faribault	37 min
May 15, 9:32 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	43 min
May 15, 9:55 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Waseca	35 min
May 15, 10:04 PM CDT	Severe Thunderstorm Warning	MPX	Steele	56 min
May 15, 10:25 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	26 min
May 15, 11:11 PM CDT	Special Weather Statement	MPX	Waseca	34 min
May 15, 11:39 PM CDT	Special Weather Statement	MPX	Rice	36 min
May 16, 1:18 AM CDT	Special Weather Statement	MPX	Rice	42 min
May 16, 3:05 AM CDT	Special Weather Statement	MPX	Lac qui Parle, Yellow Medicine	55 min
May 16, 3:47 AM CDT	Special Weather Statement	MPX	Chippewa, Kandiyohi, Stevens, Swift	28 min
May 16, 4:20 AM CDT	Special Weather Statement	MPX	Kandiyohi, Stearns	55 min
May 16, 5:06 AM CDT	Special Weather Statement	MPX	Brown, Martin, Redwood, Watonwan	84 min
May 16, 2:54 PM CDT	Flash Flood Watch	MPX	Faribault, Freeborn, Goodhue, Rice, Steele, Waseca	12 hr
May 16, 3:04 PM CDT	Special Weather Statement	MPX	Rice	26 min
May 16, 3:27 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice	48 min
May 16, 4:06 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Washington	39 min
May 16, 5:32 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice	43 min
May 16, 5:42 PM CDT	Severe Thunderstorm Warning	MPX	Rice	33 min
May 16, 6:16 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue	44 min
May 16, 6:58 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	47 min
May 16, 4:01 PM CDT	Severe Thunderstorm Warning	MPX	Polk, Saint Croix	44 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

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017 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.