Alert archive / Minnesota / Special Weather Statements in 2021

Special Weather Statement, NWS Twin Cities, MN

August 10, 2021Chisago County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Aug 10, 2021, 10:20 AM CDT for Chisago County, Minnesota. 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 10, 2021, 10:20 AM CDT (15:20 UTC)
Expired: Aug 10, 2021, 10:45 AM CDT
In force: 25 min
Issued by: NWS Twin Cities, MN
Hail: 0.88 in
Wind: 40

County Chisago County, MN

The radar

The Minneapolis radar (KMPX), 94 km from the middle of the area, began a volume at 15:23 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, 3.3 hours before the alert went out and 96 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: 3048 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 538 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

315 
WWUS83 KMPX 101520
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1020 AM CDT Tue Aug 10 2021
 
MNZ053-WIZ014-101545-
Chisago MN-Polk WI-
1020 AM CDT Tue Aug 10 2021

...A strong thunderstorm will impact portions of southeastern Chisago
and central Polk Counties through 1045 AM CDT...

At 1020 AM CDT, Doppler radar was tracking a strong thunderstorm over
Chisago City, or 18 miles southeast of Cambridge, moving northeast at
50 mph.

HAZARD...Winds in excess of 40 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...
  Lindstrom and Center City around 1025 AM CDT.
  St. Croix Falls and Taylors Falls around 1035 AM CDT.
  Centuria around 1040 AM CDT.

Other locations in the path of this storm include Luck and Milltown.

This includes the following highways...
 Interstate 35 between mile markers 134 and 145.
 U.S. Highway 8 in Minnesota between mile markers 2 and 5, and
between mile markers 7 and 19.
 U.S. Highway 61 between mile markers 163 and 164.

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 4555 9230 4531 9287 4529 9294 4530 9302
      4545 9302 4564 9278 4564 9270
TIME...MOT...LOC 1520Z 235DEG 40KT 4538 9292 

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

$$

BPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 10:09 AM CDT	Special Weather Statement	MPX	Anoka	21 min

Nearby

Special Weather Statements in Minnesota, 2021 Every 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.