Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 1908

August 6, 20045 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2004, 7:22 PM MDT for 5 counties in Montana. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Aug 6, 2004, 7:22 PM MDT (01:22 UTC)
Expired
Aug 6, 2004, 8:15 PM MDT
In force
53 min
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Musselshell County, MT, Rosebud County, MT, Treasure County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 51 km from the middle of the area, began a volume at 01:24 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, 1.4 hours before the alert went out and 262 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.

Skew-T log-pSkew-T log-p diagram, Great_falls, MT at 00:00Z on 2004-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 00:00Z on 2004-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
4495 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

098 
ACUS11 KWNS 070122
SWOMCD
SPC MCD 070122 
MTZ000-WYZ000-070215-

MESOSCALE DISCUSSION 1908
NWS STORM PREDICTION CENTER NORMAN OK
0822 PM CDT FRI AUG 06 2004

AREAS AFFECTED...SRN MT AND NRN WY

CONCERNING...SEVERE THUNDERSTORM WATCH 715...

VALID 070122Z - 070215Z

SEVERE STORM CONTINUES IN WW EAST OF BIL.

ONE INTENSE STORM WAS LOCATED EAST OF BIL AND APPEARED TO BE
INGESTING THE STRONGER INSTABILITY WITH MLCAPES TO NEAR 1500 J/KG.
THIS STORM IS LIKELY TO REMAIN STRONG/SEVERE THE NEXT FEW HOURS AS
IT PROPAGATES NEWD INTO NELY BOUNDARY LAYER WINDS. OTHER SEVERE
STORMS MAY STILL DEVELOP TO THE NORTH AND EAST OF BIL...BUT
SUBSIDENCE AND DRIER FLOW TO THE WEST OF AND SOUTH OF BIL SHOULD
LIMIT THE SEVERE WEATHER THREAT IN THOSE AREAS.

..IMY.. 08/07/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...BYZ...

46690898 46670575 44760613 45260876 45620918

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 6, 8:36 PM MDTMesoscale DiscussionSPCRosebud, Treasure24 min
Aug 7, 1:28 AM MDTMesoscale DiscussionSPCFlathead, Lake, Lincoln, Mineral, Sanders92 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.