Alert archive / Wisconsin / Tornado Watches in 2007
Tornado Watch 504
The Storm Prediction Center issued this tornado watch at Jul 10, 2007, 12:55 PM EDT for 12 counties in Michigan; 22 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2007, 12:55 PM EDT (16:55 UTC)
- Expired
- Jul 10, 2007, 5:39 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 34 counties
Alger County, MI, Baraga County, MI, Delta County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Luce County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Schoolcraft County, MI, Brown County, WI, Calumet County, WI, Door County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The Marquette radar (KMQT), 77 km from the middle of the area, began a volume at 16:55 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 2:55 PM EDT | Severe Thunderstorm Warning | GRB | Menominee, Shawano | 35 min |
| Jul 10, 2:57 PM EDT | Severe Thunderstorm Warning | MQT | Dickinson | 33 min |
| Jul 10, 3:33 PM EDT | Severe Thunderstorm Warning | MQT | Marquette | 42 min |
| Jul 10, 3:59 PM EDT | Severe Thunderstorm Warning | MQT | Alger | 61 min |
| Jul 10, 4:03 PM EDT | Severe Thunderstorm Warning | GRB | Door | 42 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 4.9 hours before the alert went out and 161 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1010 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 101655
SEL4
SPC WW 101655
MIZ000-WIZ000-LMZ000-LSZ000-110100-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 504
NWS STORM PREDICTION CENTER NORMAN OK
1155 AM CDT TUE JUL 10 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
THE UPPER PENINSULA OF MICHIGAN
NORTHEAST WISCONSIN
LAKE MICHIGAN
LAKE SUPERIOR
EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1155 AM UNTIL 800
PM CDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHEAST OF
MARQUETTE MICHIGAN TO 25 MILES SOUTHWEST OF GREEN BAY WISCONSIN.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
DISCUSSION...SCATTERED THUNDERSTORMS WILL LIKELY DEVELOP EARLY THIS
AFTERNOON ALONG A PRE-FRONTAL TROUGH MOVING EWD ACROSS WI/UPPER MI.
MODERATE INSTABILITY IN THE WARM SECTOR...IN COMBINATION WITH STRONG
DEEP LAYER VERTICAL SHEAR...SHOULD SUPPORT A FEW DISCRETE SUPERCELLS
WITH THE INITIAL DEVELOPMENT. RELATIVELY RICH LOW-LEVEL MOISTURE
AND STRONGER LOW-LEVEL SHEAR OVER EXTREME NE WI AND UPPER MI MAY
SUPPORT A FEW TORNADOES WITH THE SUPERCELLS. THE THREAT FOR
DAMAGING WINDS SHOULD ALSO INCREASE AS STORM COVERAGE INCREASES
THROUGH THE AFTERNOON...AND STORM INTERACTIONS LEAD TO MORE LINE
SEGMENT DEVELOPMENT.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 25035.
...THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 11:29 AM EDT | Mesoscale Discussion | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Iron and 3 more | 91 min |
| Jul 10, 1:55 PM EDT | Mesoscale Discussion | SPC | Antrim, Charlevoix, Cheboygan, Clare, Crawford, Emmet and 20 more | 95 min |
| Jul 10, 3:29 PM EDT | Mesoscale Discussion | SPC | Alger, Delta, Menominee, Schoolcraft | 91 min |
| Jul 10, 3:54 PM EDT | Severe Thunderstorm Watch | SPC | Alcona, Allegan, Alpena, Antrim, Arenac, Bay and 45 more | 7 hr |
| Jul 10, 2:14 PM EDT | Mesoscale Discussion | SPC | Green, Jefferson, Kenosha, Milwaukee, Ozaukee, Racine and 4 more | 61 min |
| Jul 10, 2:43 PM EDT | Severe Thunderstorm Watch | SPC | Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more | 5 hr |
Nearby
Tornado Watches in Wisconsin, 2007Tornado Watches in Michigan, 2007Every tornado watch in 2007
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; radar from the NEXRAD Level II archive.