Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 43, NWS Twin Cities, MN

April 18, 2002Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 18, 2002, 3:52 AM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 53 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: Apr 18, 2002, 3:52 AM CDT (08:52 UTC)
Expired: Apr 18, 2002, 4:45 AM CDT
In force: 53 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 82 km from the middle of the area, began a volume at 08:55 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
Apr 18, 4:30 AM CDT	Hail 0.75	Roberts, 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
Apr 18, 1:00 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 8.9 hours before the alert went out and 84 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: 2104 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 146 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 180852
SVRMSP
WIC093-109-180945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
352 AM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN
  PIERCE COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 445 AM CDT

* AT 352 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL 16 MILES WEST OF RIVER FALLS...OR ABOUT 12 MILES SOUTHEAST OF
  ST PAUL...MOVING NORTHEAST AT 45 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  BALDWIN.
  DEER PARK.
  HAMMOND.
  NEW RICHMOND.
  RIVER FALLS.
  ROBERTS.
  SOMERSET.

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

LAT...LON 4517 9273 4476 9271 4477 9228 4519 9231

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 4:49 AM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn	41 min
Apr 18, 5:24 AM CDT	Tornado Warning	MPX	Dunn	21 min
Apr 18, 5:36 AM CDT	Severe Thunderstorm Warning	MPX	Barron	24 min
Apr 18, 5:42 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa	33 min
Apr 18, 4:12 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	63 min
Apr 18, 4:20 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire, Pepin	40 min
Apr 18, 4:28 PM CDT	Severe Thunderstorm Warning	MPX	Dunn	32 min
Apr 18, 4:57 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	63 min
Apr 18, 5:34 PM CDT	Severe Thunderstorm Warning	MPX	Rusk	26 min
Apr 18, 5:57 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	63 min
Apr 18, 6:59 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	31 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.