Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 174, NWS Twin Cities, MN

July 21, 2002Rusk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 21, 2002, 3:06 PM CDT for Rusk County, Wisconsin. It was in force for 54 min. 2 reports 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: Jul 21, 2002, 3:06 PM CDT (20:06 UTC)
Expired: Jul 21, 2002, 4:00 PM CDT
In force: 54 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Rusk County, WI

The radar

The Duluth radar (KDLH), 156 km from the middle of the area, began a volume at 20:07 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
Jul 21, 3:10 PM CDT	Hail 1.75	Ladysmith, WI
Jul 21, 3:10 PM CDT	Hail 1.75	Exeland, WI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 21, 2:55 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.1 hours before the alert went out and 206 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: 2410 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1319 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 94 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.

863 
WUUS53 KMPX 212006
SVRMSP
WIC107-212100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
306 PM CDT SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  RUSK COUNTY IN NORTHWEST WISCONSIN

* UNTIL 400 PM CDT

* AT 304 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM OVER SAWYER
  COUNTY...OR ABOUT 18 MILES NORTHWEST OF LADYSMITH...MOVING
  NORTHEAST AT 20 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  HAWKINS    
    
THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4569 9152 4546 9155 4559 9068 4566 9076

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 4:42 PM CDT	Severe Thunderstorm Warning	MPX	Dunn	33 min
Jul 21, 4:46 PM CDT	Severe Thunderstorm Warning	MPX	Rusk	44 min

Nearby

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.