Alert archive / Minnesota / Special Weather Statements in 2020

Special Weather Statement, NWS Twin Cities, MN

August 22, 2020Sherburne County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Aug 22, 2020, 6:51 AM CDT for Sherburne County, Minnesota. It was in force for 39 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 22, 2020, 6:51 AM CDT (11:51 UTC)
Expired
Aug 22, 2020, 7:30 AM CDT
In force
39 min
Issued by
NWS Twin Cities, MN

County Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 80 km from the middle of the area, began a volume at 11:54 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, 11.9 hours before the alert went out and 79 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 2020-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2353 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 2020-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 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
2353 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1265 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
276 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 Aug 22, 4:30 AM CDT, 2 hours 21 minutes earlier.

Area forecast discussion, Aug 22, 4:30 AM CDT, 2 hours 21 minutes before
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</head>
<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Aug 22, 4:32 AM CDT, 2 hours 19 minutes before
Hazardous Weather Outlook
National Weather Service Twin Cities/Chanhassen MN
432 AM CDT Sat Aug 22 2020

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
230945-
Douglas-Todd-Morrison-Mille Lacs-Kanabec-Stevens-Pope-Stearns-
Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-Chippewa-
Kandiyohi-Meeker-Wright-Hennepin-Anoka-Ramsey-Washington-
Yellow Medicine-Renville-McLeod-Sibley-Carver-Scott-Dakota-
Redwood-Brown-Nicollet-Le Sueur-Rice-Goodhue-Watonwan-Blue Earth-
Waseca-Steele-Martin-Faribault-Freeborn-Polk-Barron-Rusk-
St. Croix-Pierce-Dunn-Pepin-Eau Claire-
432 AM CDT Sat Aug 22 2020

This Hazardous Weather Outlook is for portions of central and
southern Minnesota...and west central Wisconsin.

.DAY ONE...Today and Tonight.

Isolated thunderstorms are possible this afternoon and evening,
with the potential for highly isolated severe storms.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

The threat for an isolated severe storm will continue into
Saturday, with strong, damaging winds being the main severe
weather threat.

There is a chance for thunderstorms on Thursday. The threat for
severe weather is low at this time.

.SPOTTER INFORMATION STATEMENT...

SKYWARN spotter activation will not be needed.

In the hours before

Special weather statement, Aug 22, 1:25 AM CDT, 5 hours 26 minutes before
Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
125 AM CDT Sat Aug 22 2020

MNZ083>085-092-093-220930-
Blue Earth-Waseca-Steele-Faribault-Freeborn-
125 AM CDT Sat Aug 22 2020

...MINOR FLOODING IS EXPECTED...

* Special Weather Statement for...
  Blue Earth County in Minnesota...
  Waseca County in Minnesota...
  Steele County in Minnesota...
  Faribault County in Minnesota...
  Freeborn County in Minnesota...

* Until 430 AM CDT.

* At 125 AM CDT, Doppler radar indicated heavy rain due to
  thunderstorms. Minor flooding is ongoing or expected to begin
  shortly in the area. Between 1 and 3 inches of rain have fallen.

* Additional rainfall amounts of 1 to 2 inches are possible.

* Locations impacted include...
  Owatonna, Albert Lea, Waseca, Blue Earth, Wells, Blooming Prairie,
  Mapleton, Winnebago, New Richland, Clarks Grove, Ellendale,
  Minnesota Lake, Elmore, Alden, Glenville, Geneva, Amboy, Emmons,
  Bricelyn and Vernon Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will 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 4406 9423 4394 9408 4393 9376 4411 9377
      4409 9305 4350 9305 4350 9411 4362 9420
      4385 9424
Special weather statement, Aug 22, 6:51 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
651 AM CDT Sat Aug 22 2020

MNZ050-051-221230-
Benton-Sherburne-
651 AM CDT Sat Aug 22 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN BENTON AND
NORTHWESTERN SHERBURNE COUNTIES...

At 651 AM CDT, a strong thunderstorm was located near Sauk Rapids, or
near St. Cloud, moving southeast at 15 mph.

Nickel size hail is possible with this storm.

Locations impacted include...
St. Cloud, Sauk Rapids, Clear Lake, Santiago, Duelm and St Cloud
Airport.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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 4557 9376 4556 9375 4555 9371 4539 9400
      4541 9402 4555 9414 4563 9408
TIME...MOT...LOC 1151Z 304DEG 13KT 4559 9408

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 7:00 PM CDTSpecial Weather StatementMPXChippewa60 min
Aug 21, 7:20 PM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Pope, Swift55 min
Aug 21, 7:55 PM CDTSpecial Weather StatementMPXKandiyohi, Meeker, Stearns50 min
Aug 21, 8:00 PM CDTSpecial Weather StatementMPXRenville60 min
Aug 21, 8:43 PM CDTSpecial Weather StatementMPXMcLeod47 min
Aug 21, 9:07 PM CDTSpecial Weather StatementMPXCarver, Wright38 min
Aug 21, 9:37 PM CDTSpecial Weather StatementMPXAnoka, Carver, Hennepin, Ramsey, Scott53 min
Aug 21, 10:12 PM CDTSpecial Weather StatementMPXLe Sueur48 min
Aug 21, 10:27 PM CDTSpecial Weather StatementMPXRenville33 min
Aug 21, 11:19 PM CDTSpecial Weather StatementMPXSibley41 min
Aug 22, 12:13 AM CDTSpecial Weather StatementMPXNicollet3 hr
Aug 22, 1:22 AM CDTFlash Flood WarningMPXBlue Earth, Brown, Nicollet4 hr
Aug 22, 1:25 AM CDTSpecial Weather StatementMPXFaribault, Freeborn, Steele, Waseca3 hr
Aug 22, 8:47 AM CDTSpecial Weather StatementMPXMorrison43 min
Aug 22, 9:26 AM CDTSpecial Weather StatementMPXKanabec, Mille Lacs64 min

Nearby

Special Weather Statements in Minnesota, 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.