Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 14, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at May 15, 2021, 4:29 PM CDT for Polk County, Wisconsin. It was in force for 22 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 15, 2021, 4:29 PM CDT (21:29 UTC)
- Expired
- May 15, 2021, 4:51 PM CDT
- In force
- 22 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Polk County, WI
The radar
The Minneapolis radar (KMPX), 103 km from the middle of the area, began a volume at 21:30 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 15, 4:29 PM CDT | HAIL 1 | 3 W Amery, WI | LOT OF SMALL HAIL, SOME QUARTER SIZE. |
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, 9.5 hours before the alert went out and 105 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 894 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
912
WUUS53 KMPX 152129
SVRMPX
WIC095-152215-
/O.NEW.KMPX.SV.W.0014.210515T2129Z-210515T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
429 PM CDT Sat May 15 2021
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
South central Polk County in northwestern Wisconsin...
* Until 515 PM CDT.
* At 429 PM CDT, a severe thunderstorm was located near Amery, or 31
miles north of River Falls, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Amery around 435 PM CDT.
Other locations in the path of this severe thunderstorm include Clear
Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on or near a lake, get away from the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 15 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
&&
LAT...LON 4531 9249 4533 9236 4521 9221 4521 9246
TIME...MOT...LOC 2129Z 332DEG 10KT 4530 9245
HAIL...1.00IN
WIND...60MPH
$$
ETA2 follow-up statements
163 WWUS53 KMPX 152144 SVSMPX Severe Weather Statement National Weather Service Twin Cities/Chanhassen MN 444 PM CDT Sat May 15 2021 WIC095-152215- /O.CON.KMPX.SV.W.0014.000000T0000Z-210515T2215Z/ Polk WI- 444 PM CDT Sat May 15 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR SOUTH CENTRAL POLK COUNTY... At 443 PM CDT, a severe thunderstorm was located near Amery, or 29 miles north of River Falls, moving southeast at 10 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... Clear Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. If on or near a lake or river, get away from the water and move indoors or inside a vehicle. remember, lightning can strike out to 15 miles from the parent thunderstorm. If you can hear thunder, you are close enough to be struck by lightning. Move to safe shelter now! Do not be caught on the water in a thunderstorm. && LAT...LON 4529 9244 4529 9231 4521 9221 4521 9242 TIME...MOT...LOC 2143Z 332DEG 10KT 4526 9242 HAIL...1.00IN WIND...<50MPH $$ ETA
650
WWUS53 KMPX 152151
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
451 PM CDT Sat May 15 2021
WIC095-152201-
/O.CAN.KMPX.SV.W.0014.000000T0000Z-210515T2215Z/
Polk WI-
451 PM CDT Sat May 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL POLK COUNTY IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However small hail is
still possible with this thunderstorm.
LAT...LON 4529 9244 4529 9231 4521 9221 4521 9242
TIME...MOT...LOC 2150Z 332DEG 10KT 4524 9240
$$
ETAThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 3:48 PM CDT | Special Weather Statement | MPX | Polk | 27 min |
| May 15, 4:07 PM CDT | Severe Thunderstorm Warning | MPX | Polk | 23 min |
| May 15, 4:50 PM CDT | Special Weather Statement | MPX | Saint Croix | 40 min |
| May 15, 5:07 PM CDT | Severe Thunderstorm Warning | MPX | Saint Croix | 23 min |
| May 15, 5:27 PM CDT | Severe Thunderstorm Warning | MPX | Saint Croix | 33 min |
| May 15, 5:44 PM CDT | Severe Thunderstorm Warning | MPX | Pierce | 46 min |
| May 15, 6:28 PM CDT | Severe Thunderstorm Warning | MPX | Pepin, Pierce | 62 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2021Every severe thunderstorm warning in 2021
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.