Alert archive / Montana / Mesoscale Discussions in 2003
Mesoscale Discussion 1413
The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2003, 12:32 PM MDT for 9 counties in Idaho; 16 counties in Montana. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2003, 12:32 PM MDT (18:32 UTC)
- Expired
- Jun 19, 2003, 2:30 PM MDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 25 counties
Blaine County, ID, Butte County, ID, Camas County, ID, Clearwater County, ID, Custer County, ID, Idaho County, ID, Lemhi County, ID, Lincoln County, ID, Valley County, ID, Beaverhead County, MT, Cascade County, MT, Deer Lodge County, MT, Flathead County, MT, Granite County, MT, Jefferson County, MT, Lake County, MT, Lewis and Clark County, MT, Mineral County, MT, Missoula County, MT, Pondera County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT, Teton County, MT
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 6.5 hours before the alert went out and 251 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
- 76 J/kg
- Mixed-layer CIN
- -473 J/kg
- Mixed-layer LCL
- 1859 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
783 ACUS11 KWNS 191832 SWOMCD SPC MCD 191832 MTZ000-IDZ000-192030- MESOSCALE DISCUSSION 1413 NWS STORM PREDICTION CENTER NORMAN OK 0132 PM CDT THU JUN 19 2003 AREAS AFFECTED...CNTRL ID/WRN MT CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 191832Z - 192030Z ...TSTMS EXPECTED TO INCREASE IN COVERAGE AND INTENSITY THROUGH THE NEXT FEW HOURS... VISIBLE SATELLITE IMAGERY SHOWS TSTMS DEVELOPING IN THE SAWTOOTH MTNS...WITH VERY STEEP LAPSE RATES NEAR 9.0 C/KM. SBCAPES ACROSS CNTRL/SRN ID ARE IN THE 1500-2000 J/KG RANGE WITH SFC DEWPOINTS IN THE MID-UPPER 50S. APPROACHING UPPER TROUGH WILL PROVIDE INCREASED FORCING FOR TSTM DEVELOPMENT. THIS LIFT...COMBINED WITH DIURNAL INSTABILITY/TERRAIN WILL RESULT IN WIDESPREAD TSTMS THIS AFTN. DEEP LAYER SHEAR IS MORE THAN SUFFICIENT FOR STRONG/SVR TSTMS...WITH THE LATEST SFC OBSERVATIONAL ANALYSIS INDICATING VALUES OF AROUND 40 KTS. SUPERCELLS ARE POSSIBLE THIS AFTN...WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREATS. A WW IS POSSIBLE WITHIN THE NEXT HOUR OR TWO. ..TAYLOR.. 06/19/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...TFX...PIH...MSO...BOI...OTX... 42861449 44581598 46481602 48971488 48141100 43441272
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 7:17 PM MDT | Mesoscale Discussion | SPC | Ada, Adams, Benewah, Boise, Bonner, Boundary and 13 more | 88 min |
| Jun 19, 4:04 PM MDT | Mesoscale Discussion | SPC | Ada, Adams, Blaine, Boise, Camas, Canyon and 11 more | 116 min |
| Jun 19, 1:05 PM MDT | Severe Thunderstorm Watch | SPC | Beaverhead, Broadwater, Deer Lodge, Gallatin, Granite, Jefferson and 9 more | 6 hr |
| Jun 19, 3:56 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Carbon, Cascade, Deer Lodge, Fergus and 21 more | 94 min |
| Jun 19, 5:46 PM MDT | Mesoscale Discussion | SPC | Cascade, Chouteau, Fergus, Hill, Judith Basin, Lewis and Clark and 6 more | 59 min |
Nearby
Mesoscale Discussions in Montana, 2003Mesoscale Discussions in Idaho, 2003Every 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.