Alert archive / Minnesota / Special Weather Statements in 2021

Special Weather Statement, NWS Twin Cities, MN

August 10, 2021Anoka County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Aug 10, 2021, 10:09 AM CDT for Anoka County, Minnesota. It was in force for 21 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, 10:09 AM CDT (15:09 UTC)
Expired
Aug 10, 2021, 10:30 AM CDT
In force
21 min
Issued by
NWS Twin Cities, MN
Hail
0.88 in
Wind
40

County Anoka County, MN

The radar

The Minneapolis radar (KMPX), 60 km from the middle of the area, began a volume at 15:09 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, 3.2 hours before the alert went out and 62 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2021-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3048 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2021-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

179 
WWUS83 KMPX 101509
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1009 AM CDT Tue Aug 10 2021
 
MNZ061-101530-
Anoka MN-
1009 AM CDT Tue Aug 10 2021

...A strong thunderstorm will impact portions of northeastern Anoka
County through 1030 AM CDT...

At 1008 AM CDT, Doppler radar was tracking a strong thunderstorm over
Ham Lake, or 19 miles north of Minneapolis, 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...
  East Bethel around 1020 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4527 9302 4515 9328 4522 9334 4542 9307
      4541 9302
TIME...MOT...LOC 1508Z 227DEG 44KT 4525 9322 

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

$$

JRB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 10:20 AM CDTSpecial Weather StatementMPXChisago25 min

Nearby

Special Weather Statements in Minnesota, 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.