Alert archive / Wisconsin / Special Weather Statements in 2020

Special Weather Statement, NWS Twin Cities, MN

June 30, 2020Polk County, Wisconsin

NWS Twin Cities, MN issued this special weather statement at Jun 30, 2020, 5:46 AM CDT for Polk County, Wisconsin. It was in force for 29 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
Jun 30, 2020, 5:46 AM CDT (10:46 UTC)
Expired
Jun 30, 2020, 6:15 AM CDT
In force
29 min
Issued by
NWS Twin Cities, MN

County Polk County, WI

The radar

The Minneapolis radar (KMPX), 124 km from the middle of the area, began a volume at 10:48 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 00:00Z, 10.8 hours before the alert went out and 126 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 00:00Z on 2020-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 488 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 00:00Z on 2020-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939Sfc1 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
488 J/kg
Mixed-layer CIN
-164 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this special weather statement went out at Jun 30, 4:58 AM CDT, 48 minutes earlier.

Area forecast discussion, Jun 30, 4:58 AM CDT, 48 minutes before
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Hazardous weather outlook, Jun 30, 5:05 AM CDT, 41 minutes before
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In the hours before

Special weather statement, Jun 29, 11:58 PM CDT, 5 hours 48 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Twin Cities/Chanhassen MN
1158 PM CDT Mon Jun 29 2020

MNC003-025-037-053-059-123-141-163-171-300700-
Wright-Hennepin-Dakota-Chisago-Anoka-Isanti-Sherburne-Washington-
Ramsey-
1158 PM CDT Mon Jun 29 2020

...URBAN AND SMALL STREAM FLOODING POSSIBLE...

Thunderstorms with heavy rain may cause minor flooding in the
following counties...

Wright...Hennepin...Dakota...Chisago...Anoka...Isanti...Sherburne...
Washington...Ramsey...

* Until 200 AM CDT.

* At 1156 PM CDT, Doppler radar indicated heavy rain due to
  thunderstorms. Rainfall amounts up to an inch may lead to
  localized areas of urban and small stream flooding.

* Some locations that will experience flooding include...
  Minneapolis, St. Paul, Cambridge, Bloomington, Brooklyn Park,
  Plymouth, Eagan, Woodbury, Maple Grove, Coon Rapids, Eden Prairie
  and Burnsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall may cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses
as well as other drainage areas and low lying spots.

&&

LAT...LON 4558 9288 4555 9274 4545 9265 4540 9265
      4529 9276 4511 9274 4507 9280 4494 9275
      4475 9281 4469 9273 4476 9333 4479 9333
      4478 9338 4486 9352 4489 9352 4489 9359
      4502 9387 4543 9353 4574 9314 4573 9285

ETA
Special weather statement, Jun 30, 1:34 AM CDT, 4 hours 12 minutes before
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Special weather statement, Jun 30, 4:44 AM CDT, 1 hour 2 minutes before
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Special weather statement, Jun 30, 5:46 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 9:02 PM CDTSpecial Weather StatementMPXBenton, Mille Lacs, Stearns88 min
Jun 29, 9:12 PM CDTSpecial Weather StatementMPXTodd63 min
Jun 29, 10:38 PM CDTSpecial Weather StatementMPXTodd112 min
Jun 29, 11:58 PM CDTSpecial Weather StatementMPXAnoka, Chisago, Hennepin, Isanti, Ramsey, Washington2 hr
Jun 30, 12:53 AM CDTAreal Flood WarningMPXMorrison9 hr
Jun 30, 4:18 AM CDTFlash Flood WarningMPXMille Lacs2 hr
Jun 30, 4:44 AM CDTSpecial Weather StatementMPXIsanti3 hr
Jun 30, 1:34 AM CDTSpecial Weather StatementMPXBarron, Dunn, Pierce, Polk, Rusk, Saint Croix3 hr

Nearby

Special Weather Statements in Wisconsin, 2020Every special weather statement 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.