Alert archive / Idaho / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 511

July 14, 200212 counties in Idaho; Ravalli County, Montana; Malheur County, Oregon

The Storm Prediction Center issued this severe thunderstorm watch at Jul 14, 2002, 4:30 PM MDT for 12 counties in Idaho; Ravalli County, Montana; Malheur County, Oregon. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jul 14, 2002, 4:30 PM MDT (22:30 UTC)
Expired: Jul 14, 2002, 10:00 PM MDT
In force: 6 hr
Issued by: the Storm Prediction Center

Counties Ada County, ID, Adams County, ID, Boise County, ID, Camas County, ID, Canyon County, ID, Custer County, ID, Elmore County, ID, Gem County, ID, Lemhi County, ID, Payette County, ID, Valley County, ID, Washington County, ID, Ravalli County, MT, Malheur County, OR

The radar

The Boise radar (KCBX), 78 km from the middle of the area, began a volume at 22:32 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

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

Issued	Product	Office	Counties	Lasted
Jul 14, 4:44 PM MDT	Severe Thunderstorm Warning	BOI	Ada	46 min
Jul 14, 5:31 PM MDT	Severe Thunderstorm Warning	BOI	Boise	29 min
Jul 14, 6:00 PM MDT	Severe Thunderstorm Warning	BOI	Boise	45 min
Jul 14, 6:49 PM MDT	Severe Thunderstorm Warning	BOI	Boise	31 min
Jul 14, 6:58 PM MDT	Severe Thunderstorm Warning	PIH	Custer	47 min

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 10.5 hours before the alert went out and 70 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: 15 J/kg
Mixed-layer CIN: -496 J/kg
Mixed-layer LCL: 3137 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: -74 m²/s²
0-3 km storm-relative helicity: -50 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 142229
SEL1  
SPC WW 142222
IDZ000-MTZ000-ORZ000-150400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 511
STORM PREDICTION CENTER NORMAN OK
422 PM MDT SUN JUL 14 2002

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

   CENTRAL AND SOUTHERN IDAHO                              
   FAR WESTERN MONTANA                            
   EASTERN OREGON                             

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 430 PM UNTIL 1000
PM MDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 90 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 105 MILES WEST SOUTHWEST OF BOISE
IDAHO TO 20 MILES NORTHEAST OF SALMON 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 509...WW 510...

DISCUSSION...THUNDERSTORM CLUSTER DEVELOPING ATTM IN SE ORE
EXPECTED TO INTENSIFY AS INTO CONTINUES NEWD THIS EVENING.
WIND AND THERMODYNAMIC SETUP APPEAR SUPPORTIVE OF BOWING STRUCTURES
WITH DAMAGING WIND/HAIL. 

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 24035.

...CORFIDI

441,1180 463,1133 440,1133 414,1180

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 3:15 PM MDT	Severe Thunderstorm Watch	SPC	Beaverhead, Broadwater, Cascade, Deer Lodge, Gallatin, Glacier and 9 more	6 hr

Nearby

Severe Thunderstorm Watches in Idaho, 2002 Severe Thunderstorm Watches in Montana, 2002 Severe Thunderstorm Watches in Oregon, 2002 Every severe thunderstorm watch in 2002

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.