Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 596

May 8, 20047 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at May 8, 2004, 2:17 PM MDT for 7 counties in Montana. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
May 8, 2004, 2:17 PM MDT (20:17 UTC)
Expired
May 8, 2004, 3:15 PM MDT
In force
58 min
Issued by
the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, McCone County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT

The radar

The Glasgow radar (KGGW), 105 km from the middle of the area, began a volume at 20:19 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 12:00Z, 8.3 hours before the alert went out and 104 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, Glasgow Intl Airport, MT at 12:00Z on 2004-05-08Temperature 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, Glasgow Intl Airport, MT at 12:00Z on 2004-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 274 square meters per square second.1939587897Sfc1 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
2223 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
274 m²/s²
0-3 km storm-relative helicity
317 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.

917 
ACUS11 KWNS 082018
SWOMCD
SPC MCD 082017 
NDZ000-MTZ000-082115-

MESOSCALE DISCUSSION 0596
NWS STORM PREDICTION CENTER NORMAN OK
0317 PM CDT SAT MAY 08 2004

AREAS AFFECTED...NERN MT

CONCERNING...SEVERE THUNDERSTORM WATCH 162...

VALID 082017Z - 082115Z

INCREASING THREAT OF SEVERE WINDS WITH CONVECTIVE LINE IN NERN
MT...ACROSS NWRN PORTION OF WW 162. 

AT 2010Z...LINE OF THUNDERSTORMS EXTENDING FROM VALLEY COUNTY INTO
SWRN MCCONE COUNTIES IN MT HAS INCREASED IN INTENSITY. THIS LINE OF
STORMS SHOULD TRACK RAPIDLY ENEWD AT 40-45 KT PASSING NEAR WOLF
POINT AROUND 21Z. SPEED OF MOVEMENT...INCREASING REFLECTIVITY...AND
SURFACE DEWPOINT DEPRESSIONS APPROACHING 40F SUGGEST SEVERE WINDS
WILL BE LIKELY WITH THIS LINE AS IT TRACKS ACROSS FAR NERN MT DURING
THE NEXT 2 HOURS.

..BANACOS.. 05/08/2004

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

ATTN...WFO...BIS...GGW...

47030578 47690647 48070697 48800690 48920600 48940386
48520354 47550360 47350354

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 11:44 AM MDTMesoscale DiscussionSPCCarter, Custer, Daniels, Dawson, Fallon, Garfield and 8 more3 hr
May 8, 1:35 PM MDTSevere Thunderstorm WatchSPCCarter, Daniels, Dawson, Fallon, McCone, Prairie and 5 more5 hr
May 8, 4:11 PM MDTMesoscale DiscussionSPCCarter, Daniels, Fallon, Richland, Roosevelt, Sheridan and 1 more64 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.