Alert archive / Wisconsin / Mesoscale Discussions in 2003
Mesoscale Discussion 1921
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 7:47 PM EDT for 9 counties in Michigan; Lake County, Saint Louis County, Minnesota; 13 counties in Wisconsin. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2003, 7:47 PM EDT (23:47 UTC)
- Expired
- Jul 20, 2003, 9:15 PM EDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 24 counties
Baraga County, MI, Delta County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Lake County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Door County, WI, Douglas County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Langlade County, WI, Marinette County, WI, Oneida County, WI, Price County, WI, Sawyer County, WI, Vilas County, WI
The radar
The Marquette radar (KMQT), 159 km from the middle of the area, began a volume at 23:50 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.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.8 hours before the alert went out and 244 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
- 765 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 716 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
796 ACUS11 KWNS 202347 SWOMCD SPC MCD 202347 MIZ000-WIZ000-MNZ000-210115- MESOSCALE DISCUSSION 1921 NWS STORM PREDICTION CENTER NORMAN OK 0647 PM CDT SUN JUL 20 2003 AREAS AFFECTED...NERN MN...NRN WI AND UPPER MI CONCERNING...SEVERE THUNDERSTORM WATCH 772... VALID 202347Z - 210115Z THREAT FOR LARGE HAIL AND ISOLATED DAMAGING WIND EXPECTED TO PERSIST NEXT 2-3 HOURS. NUMEROUS STORMS CONTINUE DEVELOPING WITHIN ZONE OF ASCENT IN EXIT REGION OF CYCLONICALLY CURVED UPPER JET WHERE MID LEVEL LAPSE RATES HAVE BEEN STEEPENED BY COLDER AIR ALOFT. UNIDIRECTIONAL WNWLY SHEAR PROFILES WILL CONTINUE TO SUPPORT ORGANIZED STORMS INCLUDING SUPERCELLS AND POTENTIAL FOR SMALL BOWING SEGMENTS. ACTIVITY SHOULD BEGIN TO DECREASE IN INTENSITY LATER THIS EVENING WITH LOSS OF HEATING. ..DIAL.. 07/20/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MQT...GRB...DLH... 45508996 45929173 46179259 46979263 47669257 48089247 47809127 47478996 47028843 46638691 46398636 45588648 44778646 44538649
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 1:41 PM EDT | Mesoscale Discussion | SPC | Barry, Branch, Calhoun, Eaton, Hillsdale, Ingham and 6 more | 64 min |
| Jul 20, 2:16 PM EDT | Mesoscale Discussion | SPC | Alger, Baraga, Dickinson, Gogebic, Houghton, Iron and 3 more | 119 min |
| Jul 20, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | Alcona, Alpena, Arenac, Bay, Clare, Clinton and 28 more | 6 hr |
| Jul 20, 2:55 PM EDT | Severe Thunderstorm Watch | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more | 7 hr |
| Jul 20, 4:27 PM EDT | Mesoscale Discussion | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more | 63 min |
| Jul 20, 4:37 PM EDT | Mesoscale Discussion | SPC | Alcona, Alpena, Arenac, Bay, Crawford, Genesee and 21 more | 113 min |
| Jul 20, 7:23 PM EDT | Mesoscale Discussion | SPC | Berrien, Cass, Saint Joseph, Van Buren | 97 min |
| Jul 20, 7:45 PM EDT | Severe Thunderstorm Watch | SPC | Allegan, Antrim, Barry, Benzie, Berrien, Branch and 27 more | 5 hr |
| Jul 19, 8:16 PM EDT | Mesoscale Discussion | SPC | Beltrami, Clearwater, Itasca, Kittson, Koochiching, Marshall and 5 more | 89 min |
| Jul 20, 12:00 AM EDT | Severe Thunderstorm Watch | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Mahnomen and 7 more | 5 hr |
| Jul 20, 2:15 AM EDT | Severe Thunderstorm Watch | SPC | Big Stone, Chippewa, Cottonwood, Douglas, Grant, Jackson and 15 more | 6 hr |
| Jul 20, 3:03 AM EDT | Mesoscale Discussion | SPC | Big Stone, Chippewa, Grant, Lac qui Parle, Lincoln, Lyon and 6 more | 117 min |
| Jul 20, 4:05 AM EDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Grant, Norman, Otter Tail, Wilkin | 4 hr |
| Jul 20, 5:14 AM EDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 34 more | 3 hr |
| Jul 20, 7:45 AM EDT | Severe Thunderstorm Watch | SPC | Blue Earth, Brown, Cottonwood, Faribault, Freeborn, Jackson and 15 more | 5 hr |
| Jul 20, 11:07 AM EDT | Mesoscale Discussion | SPC | Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 3 more | 53 min |
| Jul 20, 6:14 PM EDT | Mesoscale Discussion | SPC | Lincoln, Lyon, Murray, Pipestone, Rock, Yellow Medicine | 2 hr |
| Jul 20, 5:25 PM EDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 19 more | 5 hr |
Nearby
Mesoscale Discussions in Wisconsin, 2003Mesoscale Discussions in Michigan, 2003Mesoscale Discussions in Minnesota, 2003Every mesoscale discussion in 2003
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.