Alert archive / Montana / Mesoscale Discussions in 2012
Mesoscale Discussion 1018
The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2012, 9:22 AM MDT for 15 counties in Montana. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Jun 2, 2012, 9:22 AM MDT (15:22 UTC)
- Expired
- Jun 2, 2012, 10:15 AM MDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
Counties Big Horn County, MT, Custer County, MT, Dawson County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Rosebud County, MT, Treasure County, MT, Valley County, MT, Yellowstone County, MT
The radar
The Billings radar (KBLX), 142 km from the middle of the area, began a volume at 15:26 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, 3.4 hours before the alert went out and 165 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1574 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
702
ACUS11 KWNS 021522
SWOMCD
SPC MCD 021522
MTZ000-021615-
MESOSCALE DISCUSSION 1018
NWS STORM PREDICTION CENTER NORMAN OK
1022 AM CDT SAT JUN 02 2012
AREAS AFFECTED...ERN MT
CONCERNING...OUTLOOK UPGRADE
VALID 021522Z - 021615Z
SUMMARY...A CATEGORICAL UPGRADE TO SLIGHT RISK IS PLANNED IN THE
UPCOMING 1630Z DAY-1 CONVECTIVE OUTLOOK.
DISCUSSION...CLUSTERS OF STORMS IN ADVANCE OF AN EWD-MOVING
SHORTWAVE TROUGH AND ATTENDANT SFC FRONT WILL POSE A THREAT FOR SVR
WIND GUSTS AND HAIL THIS AFTERNOON INTO EARLY EVENING ACROSS ERN
MT...AS MARGINAL DESTABILIZATION COMMENCES AMIDST MODERATE/STRONG
DEEP SHEAR. PLEASE SEE THE FORTHCOMING 1630Z DAY-1 CONVECTIVE
OUTLOOK FOR ADDITIONAL METEOROLOGICAL ANALYSIS ON THIS
SCENARIO...WHICH WILL INCLUDE A CATEGORICAL UPGRADE TO SLIGHT RISK
ACROSS ERN MT.
..COHEN/CARBIN.. 06/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BYZ...GGW...TFX...
LAT...LON 47040979 48210885 48730781 48750616 47960489 46680490
45800516 45360587 45040748 45200879 46330983 47040979SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 12:52 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Custer, Fergus, Gallatin, Garfield and 11 more | 113 min |
| Jun 2, 2:10 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Broadwater, Carbon, Carter, Cascade, Custer and 27 more | 7 hr |
Nearby
Mesoscale Discussions in Montana, 2012Every mesoscale discussion in 2012
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.