Alert archive / Montana / Mesoscale Discussions in 2004
Mesoscale Discussion 1113
The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2004, 4:40 AM MDT for 6 counties in Montana. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jun 6, 2004, 4:40 AM MDT (10:40 UTC)
- Expired
- Jun 6, 2004, 6:15 AM MDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
Counties Chouteau County, MT, Fergus County, MT, Judith Basin County, MT, Meagher County, MT, Petroleum County, MT, Wheatland County, MT
The radar
The Great Falls radar (KTFX), 102 km from the middle of the area, began a volume at 10:43 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
Great_falls, MT (KTFX), launched 00:00Z, 10.7 hours before the alert went out and 46 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
- 537 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 2966 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
306 ACUS11 KWNS 061040 SWOMCD SPC MCD 061040 MTZ000-061215- MESOSCALE DISCUSSION 1113 NWS STORM PREDICTION CENTER NORMAN OK 0540 AM CDT SUN JUN 06 2004 AREAS AFFECTED...N CENTRAL MT... CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 061040Z - 061215Z LOCALIZED THREAT FOR DAMAGING WINDS EVOLVING ACROSS N CENTRAL MT ATTM...BUT NEW WW NOT EXPECTED ATTM BARRING MESOSCALE STORM / COLD POOL ORGANIZATION. LATEST DATA INDICATES AXIS OF MARGINAL /UNDER 1000 J/KG MOST-UNSTABLE CAPE/ INSTABILITY ACROSS CENTRAL MT ATTM...AHEAD OF 60-PLUS KT MID-LEVEL JET STREAK NOW EJECTING EWD ACROSS WRN AND INTO CENTRAL MT. ALTHOUGH DEGREE OF INSTABILITY SHOULD CONTINUE TO LIMIT THE SEVERE THREAT...INCREASINGLY-STRONG LOW- TO MID-LEVEL WIND FIELD SUPPORTS STRONG / LOCALLY DAMAGING WIND GUSTS WITH A FEW STRONGER STORMS. MINI BOW MOVING RAPIDLY ACROSS ERN CASCADE COUNTY ATTM -- WHICH MOVED 15 MILES S OF TFX /GREAT FALLS MT/ RADAR -- INDICATED 65-PLUS KT WIND JUST ABOVE THE GROUND FOR ABOUT A HALF HOUR -- INDICATIVE OF INCREASINGLY-STRONG WIND FIELD ACROSS THIS REGION. WITH ELY COMPONENT OF LOW-LEVEL JET STILL INDICATED ACROSS THE ERN HALF OF MT BENEATH WLY FLOW ALOFT...AT LEAST SOME POTENTIAL FOR AN ORGANIZED / FORWARD-PROPAGATING BOW EXISTS. AGAIN...IT APPEARS ATTM THAT THIS THREAT SHOULD BE MODULATED BY LIMITED INSTABILITY. HOWEVER...GIVEN THAT A FEW ORGANIZED / SEVERE STORMS HAVE PERSISTED...THIS REGION BEARS WATCHING. WE WILL CONTINUE TO MONITOR THE AREA FOR SIGNS OF POTENTIAL CONVECTIVE ORGANIZATION AT GREATER THAN STORM SCALE...WHICH COULD NECESSITATE WW ISSUANCE. ..GOSS.. 06/06/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BYZ...GGW...TFX... 48121115 48351049 47990911 47160793 46480854 46390968 46211101 46701140
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 6:35 PM MDT | Mesoscale Discussion | SPC | Broadwater, Cascade, Chouteau, Glacier, Hill, Jefferson and 9 more | 115 min |
| Jun 5, 9:10 PM MDT | Mesoscale Discussion | SPC | Blaine, Broadwater, Cascade, Chouteau, Deer Lodge, Fergus and 19 more | 95 min |
Nearby
Mesoscale Discussions in Montana, 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.