Alert archive / Idaho / Mesoscale Discussions in 2003

Mesoscale Discussion 1149

May 30, 200319 counties in Idaho

The Storm Prediction Center issued this mesoscale discussion at May 30, 2003, 8:29 AM MDT for 19 counties in Idaho. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 30, 2003, 8:29 AM MDT (14:29 UTC)
Expired: May 30, 2003, 10:30 AM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bannock County, ID, Bingham County, ID, Blaine County, ID, Bonneville County, ID, Butte County, ID, Camas County, ID, Caribou County, ID, Cassia County, ID, Elmore County, ID, Gooding County, ID, Jefferson County, ID, Jerome County, ID, Lincoln County, ID, Madison County, ID, Minidoka County, ID, Oneida County, ID, Owyhee County, ID, Power County, ID, Twin Falls County, ID

The radar

The Boise radar (KCBX), 158 km from the middle of the area, began a volume at 14:29 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.

Severe Thunderstorm Watch 440May 30, 9:00 AM MDT

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 2.5 hours before the alert went out and 162 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1493 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 382 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.

554 
ACUS11 KWNS 301430
SWOMCD
SPC MCD 301429 
IDZ000-UTZ000-NVZ000-ORZ000-301630-

MESOSCALE DISCUSSION 1149
NWS STORM PREDICTION CENTER NORMAN OK
0929 AM CDT FRI MAY 30 2003

AREAS AFFECTED...N CNTRL NV...SRN ID

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 301429Z - 301630Z

WW IS LIKELY SOON.

STRONG CONVECTIVE DEVELOPMENT IS ONGOING ACROSS PARTS OF THE NORTH
CENTRAL GREAT BASIN...WITH A GRADUAL INTENSIFICATION EVIDENT DURING
THE PAST COUPLE OF HOURS ACROSS PARTS OF SOUTHEAST OREGON/NORTHWEST
NEVADA/SOUTHWEST IDAHO.  ACTIVITY IS BEING SUPPORTED BY STRONG
MID/UPPER FORCING FOR UPWARD VERTICAL MOTION ASSOCIATED WITH
VIGOROUS SHORT WAVE TROUGH CURRENTLY MIGRATING NORTHEAST OF THE
NORTHERN SIERRA/SOUTHERN CASCADES REGION.  THOUGH MODELS SUGGEST
SHORT WAVE WILL WEAKEN TODAY AS IT MOVES THROUGH LARGER-SCALE UPPER
RIDGE AXIS OVER THE NORTHERN INTER MOUNTAIN REGION...FORCING IS
EXPECTED TO REMAIN SUFFICIENT TO SUPPORT ADDITIONAL CONVECTIVE
DEVELOPMENT.

ENVIRONMENT IS MOIST AND POTENTIALLY MODERATELY UNSTABLE ACROSS MUCH
OF SOUTHERN IDAHO AND NORTHERN NEVADA...AND WITH CONTINUED SURFACE
HEATING...MEAN MIXED LAYER CAPE IN EXCESS OF 1000 J/KG IS LIKELY. 
50 KT MID-LEVEL FLOW IS CONTRIBUTING TO SUFFICIENT VERTICAL SHEAR
FOR ISOLATED SUPERCELLS...AND THIS THREAT WILL CONTINUE INTO THE
AFTERNOON HOURS.  MOST INTENSE CELLS WILL PERSIST IN ASSOCIATION
WITH STRONGEST MID-LEVEL FORCING ACROSS NORTH CENTRAL
NEVADA/SOUTHWEST IDAHO NEXT FEW HOURS...WITH ADDITIONAL SEVERE CELLS
LIKELY DEVELOPING SHORTLY ACROSS PARTS OF SOUTHEAST IDAHO...IN ZONE
OF ENHANCED LOW-LEVEL WARM ADVECTION.

..KERR.. 05/30/2003

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

ATTN...WFO...SLC...PIH...BOI...LKN...

41931746 43151678 43651564 44051352 43901140 42631124
41841269 41391458 41031694

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 29, 8:25 PM MDT	Mesoscale Discussion	SPC	Bonneville, Caribou, Fremont, Madison, Teton	65 min
May 30, 9:00 AM MDT	Severe Thunderstorm Watch	SPC	Ada, Blaine, Boise, Camas, Canyon, Cassia and 10 more	5 hr
May 30, 11:46 AM MDT	Mesoscale Discussion	SPC	Bannock, Bingham, Blaine, Butte, Camas, Cassia and 12 more	119 min
May 30, 12:35 PM MDT	Severe Thunderstorm Watch	SPC	Bingham, Blaine, Boise, Butte, Camas, Cassia and 12 more	6 hr
May 30, 1:06 PM MDT	Mesoscale Discussion	SPC	Bannock, Bear Lake, Bingham, Blaine, Butte, Camas and 10 more	2 hr
May 30, 2:18 PM MDT	Mesoscale Discussion	SPC	Bingham, Butte, Cassia, Jefferson, Jerome, Minidoka and 2 more	117 min
May 30, 5:28 PM MDT	Mesoscale Discussion	SPC	Ada, Bingham, Blaine, Boise, Butte, Camas and 13 more	92 min

Nearby

Mesoscale Discussions in Idaho, 2003 Every 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; radar from the NEXRAD Level II archive.