Alert archive / Idaho / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 12, NWS Boise, ID

July 13, 20024 counties in Idaho

NWS Boise, ID issued this severe thunderstorm warning at Jul 13, 2002, 11:04 PM MDT for 4 counties in Idaho. It was in force for 56 min. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 13, 2002, 11:04 PM MDT (05:04 UTC)
Expired: Jul 14, 2002, 12:00 AM MDT
In force: 56 min
Issued by: NWS Boise, ID
Area: Counties, with a storm outline in the text

Counties Ada County, ID, Canyon County, ID, Gem County, ID, Payette County, ID

The radar

The Boise radar (KCBX), 40 km from the middle of the area, began a volume at 05:04 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.

What was reported inside it

Time	Report	Where
Jul 13, 11:10 PM MDT	Thunderstorm Wind 50 E	Countywide, ID
Jul 13, 11:10 PM MDT	Thunderstorm Wind 50 E	Countywide, ID
Jul 13, 11:12 PM MDT	Thunderstorm Wind 52 M	Kuna, ID
Jul 13, 11:15 PM MDT	Thunderstorm Wind 52 M	Fruitland, ID

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 5.1 hours before the alert went out and 435 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: 1234 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 2917 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boise, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 13, 10:15 PM MDT, 49 minutes earlier.

Area forecast discussion, Jul 13, 10:15 PM MDT, 49 minutes before

SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE IDAHO
1015 PM MDT SAT JUL 13 2002

GUSTY WINDS 20 TO 40 MPH AND LIGHTNING, WITH LOCALIZED BLOWING DUST,
MAIN THREAT WITH THUNDERSTORMS  STIL TONIGHT THO DEEPER MOISTURE IN
NV BROUGHT WETTING RAINS FURTHER SOUTH.  TRANSITION TO LIGHT RAINER
SHOWERS AND THUNDERSTORMS EXPECTED 1 TO AROUND 3 AM...BUT TIL THEN
SOME GUSTY WINDS WITH WAVES OF TS TNGT.  TEMPS MILD TONIGHT BUT A
COOL FRONT IS EXPECTED INTO SE OREGON OVERNIGHT AS A WEAK WAVE
PUSHES THROUGH THE PACIFIC NW.  AS TS HAVENT MOISTENED UP QUITE YET
WILL EXTEND RED FLAG WARNING THRU 1 AM PDT WEST AND 3 AM EAST FOR
FIRE WEATHER ZONES.

NOWCAST IN EFFECT THRU 1110 PM SOUTH AND 1 AM TREASURE VLY.  TS
WINDS.

TS HAVE MOISTENED UP DRAMATICALLY IN THE SW PART 1.15 INCHES/5 HOURS
AT FRENCH GLEN.

.BOI...RED FLAG WARNING EXPIRES FOR VALE, EXTENDED TIL 1/2AM FOR
BURNS BLM AND BOISE BLM. ZONES 636/7 AND 408.

The office that day

Everything else NWS Boise, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 11:57 PM MDT	Severe Thunderstorm Warning	BOI	Boise, Elmore	48 min
Jul 14, 12:09 AM MDT	Severe Thunderstorm Warning	BOI	Valley	66 min
Jul 14, 4:13 PM MDT	Severe Thunderstorm Warning	BOI	Canyon, Owyhee, Payette	47 min
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

Nearby

Severe Thunderstorm Warnings in Idaho, 2002 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.