Alert archive / Oregon / Mesoscale Discussions in 2004
Mesoscale Discussion 2049
The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2004, 2:46 PM MDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 19, 2004, 2:46 PM MDT (20:46 UTC)
- Expired
- Aug 19, 2004, 5:15 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Adams County, ID, Owyhee County, ID, Payette County, ID, Washington County, ID, Elko County, NV, Baker County, OR, Grant County, OR, Malheur County, OR, Union County, OR, Wallowa County, OR, Asotin County, WA
The radar
The Boise radar (KCBX), 20 km from the middle of the area, began a volume at 20:48 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 nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 8.8 hours before the alert went out and 29 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
- 207 J/kg
- Mixed-layer CIN
- -188 J/kg
- Mixed-layer LCL
- 1693 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
307 ACUS11 KWNS 192047 SWOMCD SPC MCD 192046 UTZ000-IDZ000-NVZ000-ORZ000-WAZ000-192315- MESOSCALE DISCUSSION 2049 NWS STORM PREDICTION CENTER NORMAN OK 0346 PM CDT THU AUG 19 2004 AREAS AFFECTED...PORTIONS ERN ORE...EXTREME SERN WA...SWRN ID...NERN NV...EXTREME NWRN UT CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 192046Z - 192315Z WIDELY SCATTERED TSTMS WILL CONTINUE TO DEVELOP -- PRIMARILY OVER HIGHER TERRAIN -- AND MOVE GENERALLY SEWD WITH POTENTIAL FOR OCCASIONAL STRONG-SEVERE GUSTS AND HAIL. WW NOT ANTICIPATED ATTM BECAUSE OF MARGINAL AND LOOSELY ORGANIZED CHARACTER OF SEVERE THREAT. MOISTURE CHANNEL IMAGERY INDICATES SHORTWAVE TROUGH WITH TWO MID/UPPER LEVEL VORTICITY MAXIMA -- ONE OVER NWRN ORE AND THE OTHER OVER NWRN MT. THESE FEATURES WILL MOVE SEWD ACROSS NRN PART OF DISCUSSION AREA THROUGH REMAINDER AFTERNOON AND...IN COMBINATION WITH INSOLATION...CONTRIBUTE TO FAVORABLE DESTABILIZATION. MODIFIED 12Z RAOBS AND RUC SOUNDINGS INDICATE STEEP LOW-MIDLEVEL LAPSE RATES 8-9 DEG C/KM ABOVE WELL-MIXED...INVERTED-V THERMODYNAMIC PROFILE IN BOUNDARY LAYER. MAX INSTABILITY SHOULD REMAIN WITHIN ABOUT 50-60 NM EITHER SIDE OF LINE FROM ALW...BKE...50 SW BOI...ENV. SFC DEW POINTS COMMONLY RANGE FROM MID 40S TO UPPER 50S F...WITH MLCAPE REACHING 1000-1500 J/KG NEAR INSTABILITY AXIS. VERTICAL WIND SHEAR WILL REMAIN LIMITED GIVEN RELATIVELY WEAK LOW-MIDLEVEL WIND FIELDS OF BELOW 20 KT...HOWEVER BOUNDARY/OROGRAPHIC ENHANCEMENTS TO NEAR-SFC KINEMATIC FIELDS MAY AUGMENT BOUNDARY LAYER SHEAR PROFILES AND CONTRIBUTE TO CONVECTIVE INTENSITY LOCALLY. ..EDWARDS.. 08/19/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SLC...PIH...MSO...BOI...LKN...OTX...PDT...MFR... 40681463 41181607 41921753 42271963 43431841 44512039 45411858 45591820 45891792 46291756 46351714 46141663 45541633 45091626 44201667 43361687 42751593 42161440 41951354 41661338 41261343 40911380 40701429
Nearby
Mesoscale Discussions in Oregon, 2004Mesoscale Discussions in Idaho, 2004Mesoscale Discussions in Nevada, 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.