Alert archive / Idaho / Mesoscale Discussions in 2004

Mesoscale Discussion 1339

June 18, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2004, 4:05 PM MDT for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2004, 4:05 PM MDT (22:05 UTC)
Expired: Jun 18, 2004, 6:00 PM MDT
In force: 115 min
Issued by: the Storm Prediction Center

All 43 counties

Ada County, ID, Adams County, ID, Benewah County, ID, Blaine County, ID, Boise County, ID, Butte County, ID, Camas County, ID, Canyon County, ID, Clark County, ID, Clearwater County, ID, Custer County, ID, Elmore County, ID, Gem County, ID, Idaho County, ID, Kootenai County, ID, Latah County, ID, Lemhi County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Shoshone County, ID, Valley County, ID, Washington County, ID, Beaverhead County, MT, Deer Lodge County, MT, Granite County, MT, Madison County, MT, Mineral County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Baker County, OR, Grant County, OR, Malheur County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Asotin County, WA, Columbia County, WA, Garfield County, WA, Walla Walla County, WA, Whitman County, WA

The radar

The Boise radar (KCBX), 222 km from the middle of the area, began a volume at 22:05 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, 10.1 hours before the alert went out and 213 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2891 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

893 
ACUS11 KWNS 182206
SWOMCD
SPC MCD 182205 
MTZ000-IDZ000-ORZ000-WAZ000-190000-

MESOSCALE DISCUSSION 1339
NWS STORM PREDICTION CENTER NORMAN OK
0505 PM CDT FRI JUN 18 2004

AREAS AFFECTED...ERN ORE/SE WA/WRN MT/SW AND CNTRL ID

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 182205Z - 190000Z

ISOLD DAMAGING WINDS/LARGE HAIL ARE POSSIBLE LATE THIS
AFTERNOON/EARLY EVENING...WW IS NOT ANTICIPATED.

BROAD FORCING FOR ASCENT AHEAD OF PACIFIC NW UPPER TROUGH WILL
CONTINUE TO SUPPORT SCATTERED TSTMS FROM ERN ORE/SE WA INTO CNTRL
ID/SW MT...WITH AN ASSOCIATED SEVERE THREAT INTO EARLY EVENING.
TEMPERATURES HAVE WARMED INTO THE 70S/80S IN THE LOWER ELEVATIONS
THIS AFTERNOON FROM ERN OR INTO ID...WHILE H5 TEMPS OF -16C TO -18C
OVERSPREAD THE REGION. RESULTANT STEEP MID LEVEL LAPSE RATES ON THE
ORDER OF 7.5 C/KM /OR GREATER/ AND MUCAPE OF 1000-1500 J/KG WILL
SUPPORT LARGE HAIL WITH MOST VIGOROUS TSTMS. ISOLD DAMAGING WIND
GUSTS WILL BE POSSIBLE AS WELL OWING TO LARGE LOW LEVEL
TEMP-DEWPOINT SPREADS AND BACKGROUND WIND FIELDS.

ISOLD/MARGINAL NATURE OF ACTIVITY WILL LIKELY PRECLUDE WW ISSUANCE.

..GUYER.. 06/18/2004

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

ATTN...WFO...TFX...PIH...MSO...BOI...OTX...PDT...

47541775 47911570 46941262 44941137 43831276 43171449
42561870 44301920 45981874

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 2:20 PM MDT	Mesoscale Discussion	SPC	Bannock, Bear Lake, Bingham, Bonneville, Caribou, Cassia and 6 more	115 min

Nearby

Mesoscale Discussions in Idaho, 2004 Mesoscale Discussions in Montana, 2004 Mesoscale Discussions in Oregon, 2004 Every 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.