Alert archive / Minnesota / Special Weather Statements in 2011

Special Weather Statement, NWS Twin Cities, MN

October 12, 2011Chisago County, Isanti County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Oct 12, 2011, 1:08 PM CDT for Chisago County, Isanti County, Minnesota. It was in force for 67 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
Oct 12, 2011, 1:08 PM CDT (18:08 UTC)
Expired
Oct 12, 2011, 2:15 PM CDT
In force
67 min
Issued by
NWS Twin Cities, MN

Counties Chisago County, MN, Isanti County, MN

The radar

The Minneapolis radar (KMPX), 94 km from the middle of the area, began a volume at 18:09 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, 6.1 hours before the alert went out and 95 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 2011-10-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 57 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 2011-10-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 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
57 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
1315 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

396 
WWUS83 KMPX 121808
SPSMPX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
108 PM CDT WED OCT 12 2011

MNZ045-052-053-061-063-WIZ014-121915-
ANOKA-CHISAGO-ISANTI-KANABEC-POLK-WASHINGTON-
108 PM CDT WED OCT 12 2011

...THUNDERSTORMS MOVING INTO/DEVELOPING OVER ANOKA...CHISAGO...
ISANTI...KANABEC...POLK AND WASHINGTON COUNTIES THROUGH 215 PM CDT...

AT 104 PM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES EAST OF ZIMMERMAN
TO 4 MILES SOUTHEAST OF BODUM TO 4 MILES WEST OF MARINE ON ST CROIX.
THESE STORMS WERE MOVING NORTH AT 35 MPH.

HAIL UP TO DIME SIZE AND WINDS UP TO 50 MPH ARE EXPECTED WITH THESE
STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  ISANTI.
  CHISAGO CITY.
  NORTH BRANCH.
  GRANDY.
  STANCHFIELD.
  DALBO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 4581 9314 4574 9313 4573 9286 4565 9287
      4565 9271 4558 9263 4506 9281 4541 9317
      4538 9350 4584 9350
TIME...MOT...LOC 1808Z 194DEG 30KT 4547 9347 4551 9313
          4523 9285

$$

CLF

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 12, 12:11 PM CDTSpecial Weather StatementMPXAnoka, Dakota, Hennepin, Ramsey, Washington64 min
Oct 12, 1:10 PM CDTSpecial Weather StatementMPXWashington50 min

Nearby

Special Weather Statements in Minnesota, 2011Every special weather statement in 2011

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.