Alert archive / Minnesota / Mesoscale Discussions in 2004
Mesoscale Discussion 486
The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2004, 2:35 PM CDT for 19 counties in Minnesota. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 28, 2004, 2:35 PM CDT (19:35 UTC)
- Expired
- Apr 28, 2004, 4:00 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
Counties Aitkin County, MN, Benton County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Itasca County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Pope County, MN, Stearns County, MN, Stevens County, MN, Todd County, MN, Wadena County, MN
The radar
The Duluth radar (KDLH), 177 km from the middle of the area, began a volume at 19:35 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
Minneapolis, MN (KMPX), launched 12:00Z, 7.6 hours before the alert went out and 197 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
- 2 J/kg
- Mixed-layer CIN
- -770 J/kg
- Mixed-layer LCL
- 1710 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 442 m²/s²
- 0-3 km storm-relative helicity
- 431 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
090 ACUS11 KWNS 281935 SWOMCD SPC MCD 281935 MNZ000-282100- MESOSCALE DISCUSSION 0486 NWS STORM PREDICTION CENTER NORMAN OK 0235 PM CDT WED APR 28 2004 AREAS AFFECTED...W-CNTRL INTO NERN MN CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 281935Z - 282100Z TSTM POTENTIAL APPEARS TO BE INCREASING AND REGION WILL BE UPGRADED TO A SLIGHT RISK AT 20Z. AS OF 1930Z...VISIBLE SATELLITE IMAGERY INDICATED A TOWERING CUMULUS FIELD DEVELOPING OVER GRANT...STEVENS AND POPE COUNTIES IN W-CNTRL MN. LATEST MESOANALYSIS SUGGESTS THAT THIS DEVELOPMENT IS OCCURRING IN A ZONE OF SUSTAINED LOW-LEVEL CONVERGENCE E OF A SURFACE LOW AND ATTENDANT PRE-FRONTAL TROUGH THAT WAS LOCATED W OF AXN AS OF 19Z. HERE TEMPERATURES HAVE WARMED THROUGH THE 80S...CONTRIBUTING TO A DEEPLY MIXED BOUNDARY LAYER WHICH IS OVERCOMING CONSIDERABLE CAP OBSERVED ON 12Z SOUNDINGS. MODIFICATION OF PROXIMITY RUC SOUNDINGS FOR CURRENT SURFACE CONDITIONS YIELDS MLCAPES OF 1000-1500 J/KG WITHIN MODERATELY SHEARED ENVIRONMENT. IF TSTMS CAN DEVELOP AND BECOME SUSTAINED....DEEPLY MIXED CHARACTER OF BOUNDARY-LAYER SUGGESTS THAT DAMAGING DOWNBURSTS WILL BE PRIMARY SEVERE WEATHER THREAT. MARGINALLY SEVERE HAIL MAY ACCOMPANY STRONGEST STORMS AS WELL. AREA WILL BE UPGRADED TO SLIGHT RISK AT 20Z AND CONVECTIVE TRENDS WILL BE MONITORED FOR POSSIBLE WW. ..MEAD.. 04/28/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DLH...MPX...FGF... 46029625 47099529 48049405 47819271 46869247 46099268 45319463 45329601
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 3:25 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Carlton, Cass, Crow Wing, Hubbard, Itasca and 5 more | 6 hr |
| Apr 28, 6:01 PM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Carlton, Crow Wing, Kanabec, Lake and 5 more | 89 min |
Nearby
Mesoscale Discussions in Minnesota, 2004Every mesoscale discussion in 2004
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.