Alert archive / Wisconsin / Special Weather Statements in 2021
Special Weather Statement, NWS Twin Cities, MN
NWS Twin Cities, MN issued this special weather statement at Aug 11, 2021, 7:50 AM CDT for Polk County, Wisconsin. It was in force for 25 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 11, 2021, 7:50 AM CDT (12:50 UTC)
- Expired
- Aug 11, 2021, 8:15 AM CDT
- In force
- 25 min
- Issued by
- NWS Twin Cities, MN
- Hail
- 0.88 in
- Wind
- 30
County Polk County, WI
The radar
The Minneapolis radar (KMPX), 116 km from the middle of the area, began a volume at 12:50 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 nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 0.8 hours before the alert went out and 118 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
- 258 J/kg
- Mixed-layer CIN
- -298 J/kg
- Mixed-layer LCL
- 1470 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
851
WWUS83 KMPX 111250
SPSMPX
Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
750 AM CDT Wed Aug 11 2021
MNZ053-WIZ014-111315-
Chisago MN-Polk WI-
750 AM CDT Wed Aug 11 2021
...A strong thunderstorm will impact portions of southeastern Chisago
and Polk Counties through 815 AM CDT...
At 750 AM CDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Milltown, or 22 miles southeast of Pine City, moving
east at 60 mph.
HAZARD...Winds in excess of 30 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This strong thunderstorm will be near...
Frederic, Luck and Milltown around 800 AM CDT.
This includes U.S. Highway 8 in Minnesota between mile markers 8 and
22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4537 9216 4536 9295 4564 9278 4565 9253
4573 9252 4572 9215
TIME...MOT...LOC 1250Z 262DEG 50KT 4557 9268
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...30 MPH
$$
ETAThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 6:12 AM CDT | Special Weather Statement | MPX | Hennepin, Wright | 33 min |
| Aug 11, 6:45 AM CDT | Severe Thunderstorm Warning | MPX | Anoka, Hennepin, Ramsey | 30 min |
| Aug 11, 8:16 AM CDT | Special Weather Statement | MPX | Barron | 44 min |
Nearby
Special Weather Statements in Wisconsin, 2021Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.