Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 57, NWS Green Bay, WI

July 21, 2002Lincoln County, Marathon County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 21, 2002, 5:59 PM CDT for Lincoln County, Marathon County, Wisconsin. It was in force for 61 min. 4 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, 5:59 PM CDT (22:59 UTC)
Expired: Jul 21, 2002, 7:00 PM CDT
In force: 61 min
Issued by: NWS Green Bay, WI
Area: Counties, with a storm outline in the text

Counties Lincoln County, WI, Marathon County, WI

The radar

The Green Bay radar (KGRB), 163 km from the middle of the area, began a volume at 22:59 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
Jul 21, 6:10 PM CDT	Thunderstorm Wind 52 E	Edgar, WI
Jul 21, 6:15 PM CDT	Thunderstorm Wind 50 E	Merrill, WI
Jul 21, 6:28 PM CDT	Thunderstorm Wind 54 M	(Auw)Wausaw Muni Arp, WI
Jul 21, 6:45 PM CDT	Thunderstorm Wind 53 E	Loyal, 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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, 11.0 hours before the alert went out and 292 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.

340 
WUUS53 KGRB 212259 CCA
SVRGRB
WIC069-073-220000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED TYPO IN COUNTY NAME
NATIONAL WEATHER SERVICE GREEN BAY WI
543 PM CDT SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL AND EASTERN MARATHON COUNTY IN WISCONSIN
  LINCOLN COUNTY IN WISCONSIN

* UNTIL 700 PM CDT

* AT 543 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  LINE OF SEVERE THUNDERSTORMS WITH STRONG WINDS AND HAIL. THE LINE
  WAS LOCATED FROM TOMAHAWK TO 45 MILES WEST OF WAUSAU. THE LINE WAS
  MOVING EAST AT 30 MPH.

* SOME LOCATIONS THAT WILL BE AFFECTED BY THE STORMS INCLUDE...
  COLBY BY 550 PM CDT.
  TOMAHAWK BY 555 PM CDT.
  MILAN BY 555 PM CDT.
  SPENCER BY 600 PM CDT.

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE FOR WINDS IN EXCESS
OF 60 MPH...HAIL...AND DEADLY LIGHTNING. SEEK SHELTER IMMEDIATELY.

IF YOU ARE AT A LARGE OUTDOOR GATHERING...REMAIN CALM. FOLLOW THE
INSTRUCTIONS PROVIDED BY LOCAL AUTHORITIES.

THIS WARNING INCLUDES THE CITY OF WAUSAU...BUT THE STORMS WILL 
LIKELY NOT REACH WAUSAU UNTIL JUST BEFORE 700 PM. A SEPARATE WARNING 
WILL BE ISSUED FOR EASTERN MARATHON COUNTY IF THE STORMS REMAIN 
SEVERE AS THE APPROACH THE EASTERN PART OF THE COUNTY.

LAT...LON 4551 8996 4527 9019 4471 9071 4472 8968
          4527 8945 4553 8949

SKOWRONSKI

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Green Bay, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 5:15 AM CDT, 12 hours 44 minutes earlier.

Area forecast discussion, Jul 21, 5:15 AM CDT, 12 hours 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
515 AM CDT SUN JUL 21 2002

FORECAST CONCERNS INCLUDE ONGOING RAIN EVENT...AND CHANCES FOR LATER
TODAY/TONIGHT.

08Z SURFACE ANAL SHOWS LOW PRESSURE OVER WEST-CENTRAL MN WITH WARM FRONT
EXTENDING TO THE EAST OVER CENTRAL WI TO JUST NORTH OF GRB. COLD FRONT
EXTENDS SOUTH THROUGH THE EASTERN DAKOTAS. WIND AND HEAVY RAIN EVENT
ONGOING OVER NORTHERN COUNTIES WITH RADAR INDICATING TOTALS OF 1 TO 2
INCHES HAVE FALLEN IN SHORT TIME. REPORTS OF 40 TO 50 MPH WINDS WITH
TREES DOWN HAVE BEEN RECEIVED FROM AREA SPOTTERS.

MODELS HAVE DIVERGED SOME ON THIS RUN WITH AVN SHOWING FASTER...DEEPER
SOLUTION THAN ETA.  ETA IS MORE CONSISTENT WITH EARLIER RUNS...THOUGH
HAS SHOWN SLIGHTLY SLOWER MOVEMENT WITH FRONTAL PASSAGE.  NEITHER MODEL
DOING WELL WITH QPF FIELDS.  HAVE BASED FORECAST ON ETA AND CURRENT SAT
TRENDS.

DURING THIS PERIOD WESTERLY FLOW REGIME TO GIVE WAY AS RIDGE IN THE WEST
BECOMES RE-ESTABLISHED PUTTING STATE BACK INTO COOLER NORTHWEST FLOW
REGIME. COLD FRONT EXPECTED TO PUSH INTO NORTHWEST ZONES LATE IN THE
DAY...THROUGH GREEN BAY DURING THE EARLY MORNING HOURS MONDAY. AFTER
PASSAGE OF CURRENT MCS...EXPECT NEXT ROUND OF PCPN TO BE ASSOCIATED WITH
PASSAGE OF COLD FRONT. MID LEVELS PRETTY WELL CAPPED WITH 700 TEMPS AT
10-12C. RRQ OF JET EJECTING OUT TO THE NORTHEAST TO PROVIDE GOOD LIFT
LATE TODAY...TONIGHT AND WITH PWS AOA 2 INCHES...HEAVY RAIN EVENT
LIKELY. HAVE PUT MENTION OF HEAVY RAIN IN ZONES. ENTIRE CWA IN SLIGHT
RISK FOR SEVERE WITH VERY MOIST AIR OVER CWA AS DEW POINTS IN THE MID
70S PUSHING NORTH THROUGH CWA. SIG SHEAR AND INSTABILITY WITH CAPES NEAR
3K...WILL LIKELY LEAD TO DEVELOPMENT OF A FEW SUPERCELLS OVER AREA THIS
EVENING.

AFTER FRONTAL PASSAGE PUSHES THROUGH...CANADIAN HIGH PRESSURE TO DROP
SOUTH OVER STATE FOR COOLER AND LESS HUMID CONDITIONS THROUGH MID WEEK.

WITH CLOUDS FROM MORNING CONVECTION...HAVE STAYED WITH COOLER ETA TEMPS
PER PREVIOUS PACKAGE.  EXPECT HEAT INDICES AOA 100 IN SOUTHERN ZONES.

NO CHANGES MADE TO EXTENDED.

COORD WITH LSE...MQT...THANKS

.GRB...NONE.

TE
WWW.CRH.NOAA.GOV/GRB

Hazardous weather outlook, Jul 21, 6:00 AM CDT, 11 hours 59 minutes before

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-211500-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREEN BAY WI
600 AM CDT SUN JUL 21 2002

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF CENTRAL...NORTH
CENTRAL AND NORTHEAST WISCONSIN.

SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND TONIGHT OVER
NORTHEAST AND PARTS OF CENTRAL AND NORTH CENTRAL WISCONSIN.

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS ALL OF NORTHEAST
AND NORTH-CENTRAL LATE THIS AFTERNOON AND TONIGHT. THE BEST CHANCE FOR
SEVERE STORMS WILL BE AFTER 2:00 PM. DAMAGING WINDS AND LARGE HAIL ARE
THE MAIN THREAT.

HOT AND HUMID CONDITIONS OVER THE STATE TODAY WILL COMBINE TO PRODUCE
HEAT INDICES AT OR AROUND 100 TODAY IN AREAS...MAINLY SOUTH OF A LINE
FROM MARINETTE TO WAUSAU. A COLD FRONT MOVING THROUGH THE STATE LATER
TODAY WILL PRODUCE THUNDERSTORMS AS IT INTERACTS WITH THIS WARM AND
HUMID AIR.

SPOTTER ACTIVATION MAY BE NECESSARY LATER THIS AFTERNOON OR TONIGHT.

THIS OUTLOOK WILL BE UPDATED AT NOON

TE
WWW.CRH.NOAA.GOV/GRB

In the hours before

Local storm report, Jul 21, 4:09 PM CDT, 1 hour 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
409 PM CDT SUN JUL 21 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0400 PM    5 N BOULDER JUNCTION      WI   .75 INCH HAIL
07/21/02   VILAS                          REPORT FROM SPOTTER.

JKL/MG

Local storm report, Jul 21, 4:26 PM CDT, 1 hour 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
426 PM CDT SUN JUL 21 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0410 PM    EAGLE RIVER               WI   WIND DAMAGE
07/21/02   VILAS                          TREES AND POWERLINES DOWN.
                                          PHELPS AND CONOVER ALSO
                                          AFFECTED.

SANDERS

Special weather statement, Jul 21, 4:45 PM CDT, 1 hour 14 minutes before

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-212300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
445 PM CDT SUN JUL 21 2002

...SEVERE THUNDERSTORMS EXPECTED THIS EVENING...

SEVERE THUNDERSTORM WATCHES REMAIN IN EFFECT UNTIL 9 PM FOR
NORTH-CENTRAL AND CENTRAL WISCONSIN...AND UNTIL 10 PM FOR NORTHEAST
AND EAST-CENTRAL WISCONSIN.

EARLY THIS EVENING...THUNDERSTORMS WITH DAMAGING WINDS AND HAIL WERE
AFFECTING NORTH-CENTRAL WISCONSIN.  ADDITIONAL STORMS ARE EXPECTED AS
THE EVENING WEARS ON.

A SEVERE THUNDERSTORM WATCH MEANS THAT THUNDERSTORMS WITH DAMAGING WINDS
AND LARGE HAIL ARE POSSIBLE.  THE STORMS WILL ALSO PRODUCE TORRENTIAL
RAINFALL.  STAY TUNED TO NOAA WEATHER RADIO FOR THE LATEST INFORMATION
ON THIS DANGEROUS WEATHER SITUATION.

JKL
WWW.CRH.NOAA.GOV/GRB

Local storm report, Jul 21, 5:16 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
516 PM CDT SUN JUL 21 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0415 PM    LAKE TOMAHAWK             WI   60 MPH WIND GUST
07/21/02   ONEIDA                         REPORT FROM SPOTTER

SANDERS

Special weather statement, Jul 21, 5:30 PM CDT, 29 minutes before

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-220000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
530 PM CDT SUN JUL 21 2002

...SEVERE THUNDERSTORMS EXPECTED THIS EVENING...

SEVERE THUNDERSTORM WATCHES REMAIN IN EFFECT UNTIL 9 PM FOR
NORTH-CENTRAL AND CENTRAL WISCONSIN...AND UNTIL 10 PM FOR
NORTHEAST AND EAST-CENTRAL WISCONSIN.

EARLIER THIS EVENING...THUNDERSTORMS WITH DAMAGING WINDS AND HAIL WERE
REPORTED ACROSS NORTH-CENTRAL WISCONSIN.  ADDITIONAL STORMS ARE EXPECTED
AS THE EVENING WEARS ON.

A SEVERE THUNDERSTORM WATCH MEANS THAT THUNDERSTORMS WITH DAMAGING WINDS
AND LARGE HAIL ARE POSSIBLE.  THE STORMS WILL ALSO PRODUCE TORRENTIAL
RAINFALL.  STAY TUNED TO NOAA WEATHER RADIO FOR THE LATEST INFORMATION
ON THIS DANGEROUS WEATHER SITUATION.

JKL
WWW.CRH.NOAA.GOV/GRB

Local storm report, Jul 21, 5:38 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
538 PM CDT SUN JUL 21 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0442 PM    ALVIN                     WI   WIND DAMAGE
07/21/02   FOREST                         REPORTED BY SHERIFF. TREES
                                          AND POWERLINES DOWN ACROSS
                                          NORTHERN PART OF COUNTY.

SANDERS

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 3:34 AM CDT	Severe Thunderstorm Warning	GRB	Vilas	41 min
Jul 21, 4:46 AM CDT	Severe Thunderstorm Warning	GRB	Oneida	59 min
Jul 21, 3:27 PM CDT	Severe Thunderstorm Warning	GRB	Oneida, Vilas	78 min
Jul 21, 4:30 PM CDT	Severe Thunderstorm Warning	GRB	Florence, Forest	75 min
Jul 21, 4:45 PM CDT	Severe Thunderstorm Warning	GRB	Oneida	75 min
Jul 21, 5:46 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	74 min
Jul 21, 6:04 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Langlade	56 min
Jul 21, 6:07 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	53 min
Jul 21, 6:40 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	65 min
Jul 21, 6:47 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Menominee, Oconto, Shawano	73 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.