Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 79, NWS Green Bay, WI

July 30, 1999Lincoln County, Oneida County, Vilas County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 30, 1999, 7:53 PM CDT for Lincoln County, Oneida County, Vilas County, Wisconsin. It was in force for 92 min. 6 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 30, 1999, 7:53 PM CDT (00:53 UTC)
Expired: Jul 30, 1999, 9:25 PM CDT
In force: 92 min
Issued by: NWS Green Bay, WI
Area: Whole counties

Counties Lincoln County, WI, Oneida County, WI, Vilas County, WI

The radar

The Green Bay radar (KGRB), 177 km from the middle of the area, began a volume at 00:54 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 30, 8:15 PM CDT	Thunderstorm Wind 50	Merrill, WI
Jul 30, 8:20 PM CDT	Thunderstorm Wind 50	Hazelhurst, WI
Jul 30, 8:20 PM CDT	Thunderstorm Wind 50	Woodruff, WI
Jul 30, 8:27 PM CDT	Thunderstorm Wind 61	Lake Tomahawk, WI
Jul 30, 8:30 PM CDT	Thunderstorm Wind 58	Countywide, WI
Jul 30, 8:35 PM CDT	Thunderstorm Wind 50	Harrison, 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 30, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.9 hours before the alert went out and 179 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: 7703 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 30, 4:30 PM CDT, 3 hours 23 minutes earlier.

Area forecast discussion, Jul 30, 4:30 PM CDT, 3 hours 23 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
430 PM CDT FRI JUL 30 1999

WILL CONTINUE HEAT ADVISORY THROUGH 800 PM. HEAT INDICES ARE ACTUALLY
FLIRTING WITH EXCESSIVE HEAT WARNING CRITERIA...SO DON/T WANT TO LET
ADVISORY EXPIRE DURING THE HOTTEST PART OF THE DAY.

A SIG CHG IN THE WEATHER WILL OCCUR DURING THE NEXT 24 HRS. COLD FRONT
CONTINUED TO MAKE STEADY EASTWARD PROGRESS DURING THE AFTERNOON. SFC
MOISTURE CONV AXIS HAD DEVELOPED ALONG THE FRONT...AND WAS ENTERING NW
WI. AFTN RADAR CONT TO SHOW TSTMS DEVELOPING OVER SW MN. FCST SOUNDINGS
FROM THE ETA MODIFIED WITH EXPECTED LATE AFTN SFC CONDITIONS SHOW ONLY A
VERY WEAK CAP ACRS N-C WI. AS A RESULT...EXPECT TSTMS TO CONT TO DEVELOP
NEWD ALONG MOISTURE CONV AXIS.

DWPTS AOA 78F COMBINED WITH NEARLY FULL SUN HAVE ALLOWED ATM ACRS MY
FCST AREA TO BE COME EXTREMELY UNSTABLE...WITH SFC-BASED CAPES EXCEEDING
6000 J/KG. DESPITE HGH WET-BULB ZERO HGTS...THIS AMNT OF INSTABILITY MAY
ALLOW A FEW STORMS TO PRODUCE LARGE HAIL. HOWEVER...MAIN SVR THREAT WILL
BE DAMAGING WINDS. WILL ALSO BE CARRYING HVY RAIN WORDING ACRS THE NW
PART OF MY FCST AREA.

MODELS ALL DIFFER ON DETAILS OF PCPN PATTERN...WITH ETA MOST AGGRESSIVE
IN ENDING PCPN FROM THE NW ON SATURDAY. HAVE ACCEPTED THE ETA SOLN IN
GENERAL...BUT WILL MOVE PCPN OUT A BIT SLOWER. TEMPS A BIT OF A PROBLEM
SINCE WE WILL BE OFF TO A WARM START. BUT WITH PLENTY OF CLDS AND SOME
PCPN STILL ARND...WILL GO BLO FWC GUID.

MUCH LESS HUMID AIR MOVG INTO THE AREA SHOULD ALLOW NIGHTIME LOWS TO
FALL INTO THE 50S ACRS MOST OF MY FCST AREA SAT NGT...WITH COMFORTABLE
HUMIDITIES EXPECTED SUNDAY.

IT APPEARS THAT THE FCST AREA WILL SPEND A SIG AMNT OF TIME ON THE COOL
SIDE OF THE FRONT THIS TIME. NEXT CHC OF RAIN SHOULD WE TUE/WED AS MRF
BRINGS SYSTEM ACRS THE MIDWEST. EVEN AT THAT...IT APPEARS THAT THE MAIN
FRONT WILL REMAIN S OF THE AREA.

.GRB...HEAT ADVISORY UNTIUL 800 PM.
       WIZ030-031-035>040-045-048>050-

COORD W LSE.

SKOWRONSKI
WWW.CRH.NOAA.GOV/GRB

In the hours before

Local storm report, Jul 30, 7:50 PM CDT, 3 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 7:36 PM CDT	Severe Thunderstorm Warning	GRB	Marathon	64 min
Jul 30, 8:42 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Langlade	78 min
Jul 30, 8:42 PM CDT	Severe Thunderstorm Warning	GRB	Florence	78 min
Jul 30, 8:49 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Wood	76 min
Jul 30, 8:59 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	91 min
Jul 30, 9:23 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln	47 min
Jul 30, 9:42 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Shawano, Waupaca, Waushara	78 min
Jul 30, 9:42 PM CDT	Severe Thunderstorm Warning	GRB	Menominee	78 min
Jul 30, 10:04 PM CDT	Severe Thunderstorm Warning	GRB	Wood	31 min
Jul 30, 10:33 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	62 min
Jul 30, 10:38 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Winnebago	97 min
Jul 30, 10:44 PM CDT	Severe Thunderstorm Warning	GRB	Calumet, Manitowoc	61 min
Jul 30, 10:47 PM CDT	Severe Thunderstorm Warning	GRB	Brown	63 min
Jul 30, 10:56 PM CDT	Severe Thunderstorm Warning	GRB	Shawano, Waupaca	64 min
Jul 30, 10:56 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	64 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1999 Every severe thunderstorm warning in 1999

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.