Alert archive / Montana / Mesoscale Discussions in 2003

Mesoscale Discussion 2116

August 7, 2003McCone County, Richland County, Montana

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2003, 12:16 AM MDT for McCone County, Richland County, Montana. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Aug 7, 2003, 12:16 AM MDT (06:16 UTC)
Expired: Aug 7, 2003, 1:15 AM MDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties McCone County, MT, Richland County, MT

The radar

The Glasgow radar (KGGW), 101 km from the middle of the area, began a volume at 06:16 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, 6.3 hours before the alert went out and 101 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 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

Open this sounding in Storm Lab

The text

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

444 
ACUS11 KWNS 070617
SWOMCD
SPC MCD 070616 
MTZ000-070715-

MESOSCALE DISCUSSION 2116
NWS STORM PREDICTION CENTER NORMAN OK
0116 AM CDT THU AUG 07 2003

AREAS AFFECTED...ERN MT

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 070616Z - 070715Z

WIND THREAT EXISTS FOR THE NEXT HOUR OR SO ACROSS PORTIONS OF NERN
MT...BUT ISOLATED THREAT SHOULD PRECLUDE A WW ISSUANCE.

A SMALL BOW ECHO EXTENDED FROM 10 SW OLF TO 35 NW OF GDV AND WAS
MOVING ENEWD AT 40 KT. DESPITE WEAK INSTABILITY...STRONG MESO HIGH
AND LARGE PRESSURE RISES SUGGEST THAT DAMAGING WINDS MAY OCCUR WITH
THIS BOW DURING THE NEXT HOUR. CURRENT MOTION PLACES SYSTEM IN ERN
RICHLAND COUNTY BY 07Z AND THEN IN EXTREME WRN ND BY 0730Z. AS THE
MESO HIGH SLOWLY WEAKENS AND THE SMALL BOW MOVES INTO A MORE STABLE
AIR MASS...WINDS WITHIN STORM SHOULD DECREASE BELOW SEVERE LIMITS.

AN ISOLATED STRONG/SEVERE STORM WAS LOCATED ABOUT 60 SSW GGW AND THE
STORM UPDRAFTS ARE LOCATED ABOVE THE COOLER BOUNDARY LAYER.
MARGINALLY SEVERE HAIL WILL BE POSSIBLE WITH THIS STORM AS IT TRACKS
EWD.

..IMY.. 08/07/2003

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

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

47200637 47390762 47940649 48080513 47970457 47640422
47350416

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 7:25 PM MDT	Mesoscale Discussion	SPC	Blaine, Fergus, Garfield, Golden Valley, Musselshell, Petroleum and 2 more	2 hr
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, 2003 Every 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.