Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 276, NWS Twin Cities, MN

August 12, 2002Saint Croix County, Wisconsin; Anoka County, Washington County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 12, 2002, 2:27 AM CDT for Saint Croix County, Wisconsin; Anoka County, Washington County, Minnesota. It was in force for 48 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 12, 2002, 2:27 AM CDT (07:27 UTC)
Expired: Aug 12, 2002, 3:15 AM CDT
In force: 48 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Anoka County, MN, Washington County, MN, Saint Croix County, WI

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 12, 12:30 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 11, 9:55 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.5 hours before the alert went out and 60 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: 1443 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1692 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

556 
WUUS53 KMPX 120727
SVRMSP
MNC003-163-WIC109-120815-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
224 AM CDT MON AUG 12 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ANOKA COUNTY IN EAST CENTRAL MINNESOTA
  WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA
  ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 315 AM CDT

* AT 224 AM CDT...RADAR INDICATED TWO SEVERE THUNDERSTORMS. ONE WAS
  OVER SHOREVIEW...AND ANOTHER WAS OVER WOODBURY. BOTH STORMS COULD
  PRODUCE LARGE HAIL. MOVEMENT WAS NORTHEAST AT 30 MPH. 

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  BLAINE.
  CIRCLE PINES.
  LINO LAKES.
  FOREST LAKE.
  STILLWATER.
  HUDSON.

THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4514 9327 4516 9299 4494 9297 4484 9288
          4494 9255 4519 9258 4521 9279 4529 9286
          4531 9315

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 7:03 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	27 min
Aug 11, 9:59 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle, Yellow Medicine	61 min
Aug 11, 11:16 PM CDT	Severe Thunderstorm Warning	MPX	Pope, Stevens, Swift	59 min
Aug 11, 11:53 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Yellow Medicine	37 min
Aug 12, 12:07 AM CDT	Severe Thunderstorm Warning	MPX	Douglas	38 min
Aug 12, 12:23 AM CDT	Severe Thunderstorm Warning	MPX	Martin, Watonwan	52 min
Aug 12, 12:55 AM CDT	Severe Thunderstorm Warning	MPX	Faribault	50 min
Aug 12, 2:14 AM CDT	Severe Thunderstorm Warning	MPX	Ramsey	31 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2002 Severe Thunderstorm Warnings in Wisconsin, 2002 Every severe thunderstorm warning in 2002

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.