Alert archive / Montana / Mesoscale Discussions in 2003
Mesoscale Discussion 2113
The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2003, 7:25 PM MDT for 8 counties in Montana. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2003, 7:25 PM MDT (01:25 UTC)
- Expired
- Aug 6, 2003, 9:30 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Blaine County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Valley County, MT
The radar
The Glasgow radar (KGGW), 145 km from the middle of the area, began a volume at 01:28 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
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.4 hours before the alert went out and 148 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
- 29 J/kg
- Mixed-layer CIN
- -218 J/kg
- Mixed-layer LCL
- 3137 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 299 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
550 ACUS11 KWNS 070126 SWOMCD SPC MCD 070125 MTZ000-070330- MESOSCALE DISCUSSION 2113 NWS STORM PREDICTION CENTER NORMAN OK 0825 PM CDT WED AUG 06 2003 AREAS AFFECTED...CNTRL/NERN MT CONCERNING...SEVERE THUNDERSTORM WATCH 848... VALID 070125Z - 070330Z A LINE OF SEVERE THUNDERSTORMS IS CURRENTLY MOVING THROUGH WW 848...WITH THE THREAT FOR LARGE HAIL AND DAMAGING WIND CONTINUING THROUGH 04 UTC. 100 MB MLCAPE REMAINS AOA 2000 J/KG IN REGION OF LOW LEVEL INSTABILITY AXIS EXTENDING FROM SERN MT TO JUST WEST OF GLASGOW. DEEP LAYER SHEAR OVER NERN MT EXCEEDS 45 KTS...AND WITH SELY LOW LEVEL INFLOW AROUND 25 KTS CONVECTION CONTINUES TO MOVE E/NEWD THROUGH WATCH 848. MESOANALYSIS INDICATES GLASGOW IS JUST EAST OF INSTABILITY AXIS...AND 00 UTC RAOB CONFIRMS MESOANALYSIS WITH ONLY 600 J/KG MUCAPE. WARM MID LEVEL TEMPERATURES SHOULD CAP/LIMIT CONVECTIVE DEVELOPMENT FARTHER SEWD INTO DEEPER MOISTURE. WITH CAPPING TO THE SOUTH AND CONVECTIVE LINE MOVING INTO A REGION OF LESSER CAPE EAST OF VALLEY AND GARFIELD COUNTIES...DO NOT ANTICIPATE AN ADDITIONAL WW AT THIS TIME. ..BRIGHT.. 08/07/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...GGW...BYZ...TFX... 48420943 48950835 48890645 47690639 46620733 46200860 46400979 47641000
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 12:16 AM MDT | Mesoscale Discussion | SPC | McCone, Richland | 59 min |
| Aug 7, 2:18 PM MDT | Mesoscale Discussion | SPC | Broadwater, Cascade, Chouteau, Deer Lodge, Gallatin, Granite and 12 more | 117 min |
| Aug 7, 3:45 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Chouteau, Daniels, Dawson, Fergus, Garfield and 14 more | 6 hr |
| Aug 7, 5:56 PM MDT | Mesoscale Discussion | SPC | Blaine, Chouteau, Daniels, Dawson, Fergus, Garfield and 14 more | 2 hr |
Nearby
Mesoscale Discussions in Montana, 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.