Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 142, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 14, 2020, 8:13 PM CDT for Polk County, Saint Croix County, Wisconsin; Washington County, Minnesota. It was in force for 47 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
- Aug 14, 2020, 8:13 PM CDT (01:13 UTC)
- Expired
- Aug 14, 2020, 9:00 PM CDT
- In force
- 47 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Washington County, MN, Polk County, WI, Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 68 km from the middle of the area, began a volume at 01:12 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 14, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 1.2 hours before the alert went out and 386 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
- 1019 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 247 m²/s²
- 0-3 km storm-relative helicity
- 426 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
835
WUUS53 KMPX 150113
SVRMPX
MNC163-WIC095-109-150200-
/O.NEW.KMPX.SV.W.0142.200815T0113Z-200815T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
813 PM CDT Fri Aug 14 2020
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
Washington County in east central Minnesota...
Western St. Croix County in west central Wisconsin...
South central Polk County in northwestern Wisconsin...
* Until 900 PM CDT.
* At 813 PM CDT, a severe thunderstorm was located over Mahtomedi, or
11 miles northeast of St. Paul, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Law enforcement reported trees down across the west metro.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Stillwater and Bayport around 825 PM CDT.
Hudson and North Hudson around 830 PM CDT.
Somerset around 835 PM CDT.
New Richmond around 845 PM CDT.
Star Prairie around 850 PM CDT.
Other locations impacted by this severe thunderstorm include
Otisville, Grant, Lake St Croix Beach, Willernie, Lakeland Shores,
Boardman, Huntington, William OBrien State Park, Willow River State
Park and St Marys Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4530 9238 4487 9240 4488 9302 4489 9301
4489 9299 4512 9298 4513 9302 4529 9302
4529 9280 4531 9273
TIME...MOT...LOC 0113Z 263DEG 35KT 4508 9297
HAIL...<.75IN
WIND...60MPH
$$
JRBThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 8:50 PM CDT | Severe Thunderstorm Warning | MPX | Barron, Dunn, Polk, Saint Croix | 40 min |
| Aug 14, 9:01 PM CDT | Severe Thunderstorm Warning | MPX | Pierce, Saint Croix | 44 min |
| Aug 14, 9:29 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Dunn | 31 min |
| Aug 14, 9:34 PM CDT | Special Weather Statement | MPX | Pepin | 56 min |
| Aug 14, 9:36 PM CDT | Special Weather Statement | MPX | Barron, Rusk | 54 min |
| Aug 14, 10:01 PM CDT | Special Weather Statement | MPX | Chippewa, Dunn | 44 min |
| Aug 14, 10:35 PM CDT | Special Weather Statement | MPX | Eau Claire | 40 min |
| Aug 14, 7:01 PM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Wright | 29 min |
| Aug 14, 7:11 PM CDT | Severe Thunderstorm Warning | MPX | Le Sueur, Nicollet, Scott, Sibley | 34 min |
| Aug 14, 7:14 PM CDT | Severe Thunderstorm Warning | MPX | Carver, McLeod, Wright | 31 min |
| Aug 14, 7:33 PM CDT | Severe Thunderstorm Warning | MPX | Carver, Hennepin | 27 min |
| Aug 14, 7:50 PM CDT | Severe Thunderstorm Warning | MPX | Anoka, Hennepin, Ramsey | 55 min |
| Aug 14, 7:56 PM CDT | Tornado Warning | MPX | Anoka, Hennepin | 9 min |
| Aug 14, 8:12 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Le Sueur, Rice, Scott | 33 min |
| Aug 14, 8:16 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Hennepin, Washington | 44 min |
| Aug 14, 8:25 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Goodhue | 50 min |
| Aug 14, 9:17 PM CDT | Special Weather Statement | MPX | Goodhue | 43 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2020Severe Thunderstorm Warnings in Minnesota, 2020Every severe thunderstorm warning in 2020
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.