Alert archive / Wisconsin / Mesoscale Discussions in 2003
Mesoscale Discussion 924
The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 5:57 PM CDT for Allamakee County, Clayton County, Fayette County, Iowa; 16 counties in Wisconsin. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2003, 5:57 PM CDT (22:57 UTC)
- Expired
- May 10, 2003, 7:30 PM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
Counties Allamakee County, IA, Clayton County, IA, Fayette County, IA, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The La Crosse radar (KARX), 126 km from the middle of the area, began a volume at 23:01 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 155 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
- 1102 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 102258 SWOMCD SPC MCD 102257 WIZ000-IAZ000-MNZ000-110030- MESOSCALE DISCUSSION 0924 NWS STORM PREDICTION CENTER NORMAN OK 0557 PM CDT SAT MAY 10 2003 AREAS AFFECTED...NERN IA AND SRN WI CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 102257Z - 110030Z SEVERE THREAT INCLUDING POTENTIAL FOR LARGE HAIL AND TORNADOES EXPECTED TO INCREASE ACROSS NERN IA/SRN WI NEXT FEW HOURS. WW WILL BE ISSUED SHORTLY ATMOSPHERE IS EXPECTED TO DESTABILIZE NWD WITH TIME AS MOIST LOW LEVEL FLOW ACCELERATES IN RESPONSE TO DEEPENING SURFACE LOW OVER IA. SHEAR PROFILES WILL BECOME INCREASINGLY FAVORABLE FOR SUPERCELLS ACROSS ERN IA INTO SRN WI AS THE LOW LEVEL FLOW BACKS AND STRENGTHENS E OF THE LOW AND ALONG/S OF THE WARM FRONT. INITIAL STORMS MAY BE ELEVATED. HOWEVER...AS THE ATMOSPHERE DESTABILIZES NWD...STORMS ARE EXPECTED TO BECOME SURFACE BASED. ..DIAL.. 05/10/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MKX...DVN...ARX... 42519093 42859191 43889094 43688812 42518793
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 5:43 AM CDT | Mesoscale Discussion | SPC | Lee | 92 min |
| May 10, 10:54 AM CDT | Mesoscale Discussion | SPC | Des Moines, Henry, Lee, Louisa, Van Buren | 66 min |
| May 10, 3:17 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Buchanan, Cedar, Clarke, Clinton and 26 more | 58 min |
| May 10, 3:50 PM CDT | Tornado Watch | SPC | Appanoose, Benton, Cedar, Clinton, Davis, Des Moines and 29 more | 6 hr |
| May 10, 6:15 PM CDT | Tornado Watch | SPC | Allamakee, Clayton, Fayette, Winneshiek | 5 hr |
Nearby
Mesoscale Discussions in Wisconsin, 2003Mesoscale Discussions in Iowa, 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.