Alert archive / Minnesota / Special Weather Statements in 2009

Special Weather Statement, NWS Twin Cities, MN

August 3, 2009Chisago County, Isanti County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Aug 3, 2009, 10:34 PM CDT for Chisago County, Isanti County, Minnesota. It was in force for 41 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 3, 2009, 10:34 PM CDT (03:34 UTC)
Expired: Aug 3, 2009, 11:15 PM CDT
In force: 41 min
Issued by: NWS Twin Cities, MN

Counties Chisago County, MN, Isanti County, MN

The radar

The Minneapolis radar (KMPX), 89 km from the middle of the area, began a volume at 03:37 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.

What was reported inside it

Time	Report	Where	Remark
Aug 3, 11:00 PM CDT	TSTM WND DMG	1 N Stacy, MN	SEVERAL TREES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.6 hours before the alert went out and 90 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1977 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 85 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.

000 
WWUS83 KMPX 040334
SPSMPX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1034 PM CDT MON AUG 3 2009

MNZ052-053-040415-
CHISAGO-ISANTI-
1034 PM CDT MON AUG 3 2009

...THUNDERSTORMS MOVING THROUGH ISANTI AND CHISAGO COUNTIES THROUGH 
1115 PM CDT...

AT 1033 PM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM BRAHAM TO 8 MILES SOUTHEAST
OF PRINCETON. THESE STORMS WERE MOVING EAST SOUTHEAST AT 40 MPH.

ONE HALF INCH DIAMETER HAIL AND WINDS UP TO 50 MPH ARE EXPECTED WITH
THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  BRAHAM.
  GRANDY.
  BODUM.
  ATHENS.
  NORTH BRANCH.
  WYOMING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS THUNDERSTORM COULD INTENSIFY QUICKLY...SO BE READY TO ACT IF A
WARNING IS ISSUED.

&&

LAT...LON 4573 9284 4559 9288 4556 9285 4556 9275
      4554 9272 4544 9264 4540 9264 4530 9274
      4530 9301 4541 9302 4541 9343 4544 9352
      4558 9352 4574 9331 4574 9288
TIME...MOT...LOC 0334Z 289DEG 38KT 4573 9313 4551 9343

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 10:47 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti, Washington	43 min
Aug 3, 10:54 PM CDT	Special Weather Statement	MPX	Swift	51 min
Aug 3, 11:16 PM CDT	Special Weather Statement	MPX	Polk	29 min

Nearby

Special Weather Statements in Minnesota, 2009 Every special weather statement in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.