Alert archive / Montana / Mesoscale Discussions in 2008
Mesoscale Discussion 1925
The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2008, 5:48 PM MDT for 13 counties in Montana; Billings County, Golden Valley County, Slope County, North Dakota. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- Jul 26, 2008, 5:48 PM MDT (23:48 UTC)
- Expired
- Jul 26, 2008, 7:45 PM MDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
Counties Custer County, MT, Dawson County, MT, Fallon County, MT, Fergus County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Valley County, MT, Wibaux County, MT, Billings County, ND, Golden Valley County, ND, Slope County, ND
The radar
The Glasgow radar (KGGW), 85 km from the middle of the area, began a volume at 23:48 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.8 hours before the alert went out and 86 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
- 2124 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 327 m²/s²
- 0-3 km storm-relative helicity
- 305 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 262349 SWOMCD SPC MCD 262348 NDZ000-MTZ000-270145- MESOSCALE DISCUSSION 1925 NWS STORM PREDICTION CENTER NORMAN OK 0648 PM CDT SAT JUL 26 2008 AREAS AFFECTED...PARTS OF CENTRAL AND ERN MT CONCERNING...SEVERE THUNDERSTORM WATCH 754... VALID 262348Z - 270145Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 754 CONTINUES. SEVERAL STRONG/SEVERE STORMS ARE ONGOING WITHIN WW 754/ACROSS THE NERN QUARTER OF MT. SCATTERED STORMS -- A FEW EXHIBITING SUSTAINED SUPERCELL CHARACTERISTICS -- CONTINUE ATTM ACROSS THIS AREA...MOVING ESEWD INTO ESELY LOW-LEVEL INFLOW. GENERALLY 1000 TO 2000 J/KG MIXED-LAYER CAPE IS INDICATED ACROSS ERN MT...WITH THE AXIS OF INSTABILITY EXTENDING ESEWD INTO W CENTRAL AND SWRN ND/NWRN SD. THIS -- AND THE FORECAST DEVELOPMENT OF A SELY LOW-LEVEL JET THIS EVENING -- SUGGESTS THAT SEVERE STORMS SHOULD CONTINUE SPREADING SEWD FOR THE NEXT SEVERAL HOURS. WITH LATEST GGW /GLASGOW MT/ VWP INDICATING 50 TO 55 KT WLYS AT MID LEVELS...SHEAR IS SUPPORTIVE OF SUPERCELLS -- AND SHOULD BECOME EVEN MORE FAVORABLE AS LOW-LEVEL SELYS INCREASE THIS EVENING. WHILE HIGH LCLS SHOULD CONTINUE TO LIMIT ANY TORNADO POTENTIAL...LARGE HAIL AND DAMAGING WIND THREAT WILL PERSIST. ..GOSS.. 07/26/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BIS...BYZ...GGW...TFX... 48680795 48800707 48350458 47450291 46220282 46060419 46440701 46570931 47420970
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 1:44 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carter, Custer, Dawson, Fallon, Fergus and 10 more | 61 min |
| Jul 26, 2:41 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Chouteau, Fergus, Garfield, Hill, Judith Basin and 5 more | 7 hr |
Nearby
Mesoscale Discussions in Montana, 2008Mesoscale Discussions in North Dakota, 2008Every mesoscale discussion in 2008
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.