Alert archive / Idaho / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 545

June 18, 20034 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2003, 1:45 PM MDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 18, 2003, 1:45 PM MDT (19:45 UTC)
Expired: Jun 18, 2003, 9:00 PM MDT
In force: 7 hr
Issued by: the Storm Prediction Center

All 39 counties

Ada County, ID, Adams County, ID, Benewah County, ID, Boise County, ID, Bonner County, ID, Boundary County, ID, Canyon County, ID, Clearwater County, ID, Elmore County, ID, Gem County, ID, Idaho County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Shoshone County, ID, Valley County, ID, Washington County, ID, Lincoln County, MT, Mineral County, MT, Sanders County, MT, Baker County, OR, Grant County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Adams County, WA, Asotin County, WA, Columbia County, WA, Ferry County, WA, Franklin County, WA, Garfield County, WA, Lincoln County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA, Walla Walla County, WA, Whitman County, WA

The radar

The Pendleton radar (KPDT), 107 km from the middle of the area, began a volume at 19:44 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.

Warnings issued inside it

2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 18, 4:09 PM MDT	Severe Thunderstorm Warning	BOI	Elmore	51 min
Jun 18, 7:17 PM MDT	Severe Thunderstorm Warning	OTX	Shoshone	43 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 7.8 hours before the alert went out and 244 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: 2668 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 109 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.

000 
WWUS20 KWNS 181943
SEL5  
SPC WW 181945
IDZ000-MTZ000-ORZ000-WAZ000-190300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 545 
NWS STORM PREDICTION CENTER NORMAN OK 
1245 PM PDT WED JUN 18 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       NORTHERN AND CENTRAL IDAHO
       NORTHWEST MONTANA
       EASTERN OREGON
       EASTERN WASHINGTON

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL
800 PM PDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 110 STATUTE MILES
EAST AND WEST OF A LINE FROM 55 MILES NORTHEAST OF COLVILLE
WASHINGTON TO 45 MILES WEST SOUTHWEST OF BOISE IDAHO.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.




DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE TO
INCREASE ACROSS EASTERN WA/ORE AND NORTHERN/CENTRAL ID THROUGH THE
AFTERNOON AND EARLY EVENING.  VERY WARM LOW LEVEL TEMPERATURES AND
MODERATE INSTABILITY WILL PROMOTE THE POTENTIAL FOR STRONG
DOWNDRAFTS...WITH THE THREAT OF DAMAGING WINDS AND HAIL.  ACTIVITY
EXPECTED TO SPREAD EASTWARD INTO WESTERN MT LATER THIS EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
VECTOR 21030.


...HART

490,1143 431,1145 431,1191 490,1192 

WWUS20 KWNS 181943
SEL5  
SPC WW 181945
IDZ000-MTZ000-ORZ000-WAZ000-190300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 545 
NWS STORM PREDICTION CENTER NORMAN OK 
1245 PM PDT WED JUN 18 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       NORTHERN AND CENTRAL IDAHO
       NORTHWEST MONTANA
       EASTERN OREGON
       EASTERN WASHINGTON

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL
800 PM PDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 110 STATUTE MILES
EAST AND WEST OF A LINE FROM 55 MILES NORTHEAST OF COLVILLE
WASHINGTON TO 45 MILES WEST SOUTHWEST OF BOISE IDAHO.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.




DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE TO
INCREASE ACROSS EASTERN WA/ORE AND NORTHERN/CENTRAL ID THROUGH THE
AFTERNOON AND EARLY EVENING.  VERY WARM LOW LEVEL TEMPERATURES AND
MODERATE INSTABILITY WILL PROMOTE THE POTENTIAL FOR STRONG
DOWNDRAFTS...WITH THE THREAT OF DAMAGING WINDS AND HAIL.  ACTIVITY
EXPECTED TO SPREAD EASTWARD INTO WESTERN MT LATER THIS EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
VECTOR 21030.


...HART

490,1143 431,1145 431,1191 490,1192

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 1:18 PM MDT	Mesoscale Discussion	SPC	Ada, Adams, Benewah, Boise, Bonner, Boundary and 14 more	57 min
Jun 18, 4:10 PM MDT	Mesoscale Discussion	SPC	Ada, Adams, Benewah, Boise, Bonner, Boundary and 13 more	110 min

Nearby

Severe Thunderstorm Watches in Idaho, 2003 Severe Thunderstorm Watches in Washington, 2003 Severe Thunderstorm Watches in Oregon, 2003 Every severe thunderstorm watch 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.