Alert archive / Minnesota / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 229, NWS Twin Cities, MN

August 8, 2004Chisago County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 8, 2004, 6:22 PM CDT for Chisago County, Minnesota. It was in force for 53 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 8, 2004, 6:22 PM CDT (23:22 UTC)
Expired: Aug 8, 2004, 7:15 PM CDT
In force: 53 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Chisago County, MN

The radar

The Minneapolis radar (KMPX), 89 km from the middle of the area, began a volume at 23:21 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 8, 5:20 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.4 hours before the alert went out and 91 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: 362 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1170 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 123 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 
WUUS53 KMPX 082322
SVRMPX
MNC025-090015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
620 PM CDT SUN AUG 8 2004

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHISAGO COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 715 PM CDT

* AT 617 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WINDS. THIS STORM WAS
  LOCATED 7 MILES NORTHWEST OF STACY...OR ABOUT 9 MILES SOUTHEAST    
  OF CAMBRIDGE...AND MOVING EAST AT 25 MPH.  THIS THUNDERSTORM HAS A 
  HISTORY OF PRODUCING A BRIEF TORNADO TOUCHDOWN NEAR ZIMMERMAN.  IF 
  THE ROTATION INCREASES OR IF A FUNNEL CLOUD IS SIGHTED WITH THIS   
  THUNDERSTORM...THEN THE SEVERE THUNDERSTORM WARNING WILL BE        
  UPGRADED TO A TORNADO WARNING.

* LOCATIONS IMPACTED INCLUDE...
  BRANCH.
  CENTER CITY.
  CHISAGO CITY.
  HARRIS.
  LINDSTROM.
  SHAFER.
  STACY.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4570 9307 4552 9298 4534 9300 4530 9275
      4554 9273

$$

MBK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 3:05 PM CDT	Severe Thunderstorm Warning	MPX	Faribault	40 min
Aug 8, 5:35 PM CDT	Severe Thunderstorm Warning	MPX	Isanti, Sherburne	55 min
Aug 8, 5:42 PM CDT	Tornado Warning	MPX	Anoka, Isanti, Sherburne	63 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2004 Every severe thunderstorm warning in 2004

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.