Alert archive / Wisconsin / Mesoscale Discussions in 2003
Mesoscale Discussion 342
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2003, 3:36 PM EST for 8 counties in Michigan; 10 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2003, 3:36 PM EST (20:36 UTC)
- Expired
- Mar 27, 2003, 8:30 PM EST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Baraga County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Keweenaw County, MI, Marquette County, MI, Ontonagon County, MI, Ashland County, WI, Bayfield County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Oneida County, WI, Price County, WI, Sawyer County, WI, Vilas County, WI, Washburn County, WI
The radar
The Marquette radar (KMQT), 139 km from the middle of the area, began a volume at 20:39 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, 8.6 hours before the alert went out and 200 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
- 1160 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 272 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
671 ACUS11 KWNS 272036 SWOMCD SPC MCD 272036 MIZ000-WIZ000-280130- MESOSCALE DISCUSSION 0342 NWS STORM PREDICTION CENTER NORMAN OK 0236 PM CST THU MAR 27 2003 AREAS AFFECTED...NRN WI AND CENTRAL/WRN UPPER MI CONCERNING...HEAVY SNOW VALID 272036Z - 280130Z POTENTIAL EXISTS FOR 1/HR SNOWFALL RATES BEGINNING THIS EVENING AND CONTINUING INTO THE OVERNIGHT PERIOD ACROSS NRN WI AND CENTRAL/WRN UPPER MI. MODERATE TO LOCALLY HEAVY WET SNOW WILL OVERSPREAD THE DISCUSSION AREA FROM SW-NE BETWEEN 27/22Z-28/02Z. STRONG 700MB TROUGH/LOW CENTER PRESENTLY OVER WRN IA IS EXPECTED TO TRACK NEWD TO N-CENTRAL WI BY 28/12Z WITHIN AN INTENSIFYING BAROCLINIC ZONE. THE 700MB DEFORMATION ZONE AND ASSOCIATED FRONTOGENETIC FORCING CORRESPONDING TO MODERATE/HEAVY PRECIPITATION AREA ACROSS SERN MN AND WRN WI AT 27/2030Z IS EXPECTED TO TRANSLATE NEWD WITH THE SYNOPTIC LOW ALLOWING FOR A SIGNIFICANT INCREASE IN MID-TROPOSPHERIC UVV ACROSS THE DISCUSSION AREA THIS EVENING INTO THE OVERNIGHT PERIOD. ETA MODEL FORECAST SOUNDINGS SUGGEST A HEAVY/WET SNOWFALL WITH SURFACE TEMPERATURES COOLING DIABATICALLY TO NEAR OR JUST SLIGHTLY BELOW FREEZING ACROSS THE REGION AS STEADY PRECIPITATION COMMENCES FROM SW TO NE OVER NRN/NWRN WI AND WRN/CENTRAL UPPER MI. A MIX OF RAIN/SNOW IS POSSIBLE EARLY OWING TO MARGINAL BOUNDARY LAYER TEMPERATURES. STEEP MID-LEVEL LAPSE RATES WILL CONTRIBUTE TO MINIMAL CAPE/SLIGHTLY NEGATIVE EPV VALUES AFTER 00Z...WITH NEAR SATURATION IN DENDRITE GROWTH LAYER /-12C TO -16C/ FAVORABLE FOR HEAVY SNOW DEVELOPMENT/ACCUMULATION BEGINNING THIS EVENING. PRESENT TRENDS SUGGEST THE AXIS OF HEAVIEST/MOST PERSISTENT SNOW FROM 60 SW IWD TO NEAR MQT DURING THE 28/00-06Z PERIOD. ..BANACOS.. 03/27/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MQT...GRB...DLH...MPX... 45758739 45568799 45548880 45568988 45649140 45779197 46599174 47129013 47508777 46178723
Nearby
Mesoscale Discussions in Wisconsin, 2003Mesoscale Discussions in Michigan, 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.