Alert archive / Idaho / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 35, NWS Missoula, MT

August 28, 2002Lemhi County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Aug 28, 2002, 6:34 PM MDT for Lemhi County, Idaho. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 28, 2002, 6:34 PM MDT (00:34 UTC)
Expired: Aug 28, 2002, 7:15 PM MDT
In force: 41 min
Issued by: NWS Missoula, MT
Area: Whole counties

County Lemhi County, ID

The radar

The Pocatello radar (KSFX), 227 km from the middle of the area, began a volume at 00:37 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 00:00Z, 0.6 hours before the alert went out and 236 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: 794 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 2127 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

477 
WUUS55 KMSO 290034
SVRMSO
IDC059-290115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
635 PM MDT WED AUG 28 2002

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LEMHI COUNTY IN EAST CENTRAL IDAHO

* UNTIL 715 PM MDT

* AT 635 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES
  SOUTHEAST OF GIBBONSVILLE...OR 23 MILES NORTH OF SALMON...MOVING
  NORTH AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  3 MILES EAST OF GIBBONSVILLE AT 640 PM MDT

LARGE HAIL IS LIKELY WITH THIS SEVERE THUNDERSTORM. DAMAGING WINDS IN
EXCESS OF 55 MPH ARE POSSIBLE...ALONG WITH FREQUENT LIGHTNING AND
HEAVY RAIN. FOR YOUR PROTECTION...GO INDOORS AND STAY AWAY FROM
WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA.

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 Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 28, 2:30 PM MDT, 4 hours 4 minutes earlier.

Area forecast discussion, Aug 28, 2:30 PM MDT, 4 hours 4 minutes before

WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
230 PM MDT WED AUG 28 2002

.SHORT TERM...THE UPPER LEVEL LOW REMAINS OVER SOUTHWEST IDAHO
TONIGHT. SATELLITE IMAGERY AND MSX RADAR SHOW ISOLATED
SHOWERS/THUNDERSTORMS MOVING TOWARD THE SOUTHERN ZONES EARLY THIS
AFTERNOON. WITH THE LOCATION OF THE UPPER LEVEL LOW WOULD EXPECT THE
SHOWERS/THUNDERSTORMS TO REMAIN SOUTH OF POLSON THIS EVENING. THE
MODELS ARE IN GOOD AGREEMENT WITH THE MOVEMENT OF THE LOW DURING THE
SHORT TERM...THE GREATEST DIFFERENCE IS IN THE QPF AMOUNTS...AVN
SEEMS TO OVER DO THE AMOUNTS TONIGHT AND THURSDAY MORNING...PREFER
THE ETA AMOUNTS. ON THURSDAY THE LOW BEGINS TO LIFT TO THE NORTH AND
OPEN UP INTO A TROUGH. ANOTHER TROUGH MOVES INTO THE CWA FROM THE
NORTHWEST ON FRIDAY AND REMAINS OVER THE AREA SATURDAY FOR A CHANCE
OF SHOWERS/THUNDERSTORMS. TEMPERATURES TO REMAIN CLOSE TO SEASONAL.
KOLATA

.LONG TERM...A DRY WEST TO NORTHWEST FLOW ALOFT WILL HOLD THROUGH
TUESDAY WHEN AN UPPER LEVEL TROUGH STARTS TO DIG IN OFF OF THE WEST
COAST. THE APPROACHING COLD FRONT/JET WILL JUST CLIP THE WESTERN
ZONES IN IDAHO AND THE VERY NORTHWEST ZONES IN MONTANA FOR A SLIGHT
CHANCE OF SHOWERS ON TUESDAY. THE TROUGH CONTINUES ITS TREK SOUTHWARD
PLACING THE AREA IN SOUTHWEST FLOW ALOFT ON WEDNESDAY FOR A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS. TEMPERATURES WILL START OFF NEAR
NORMAL THEN COOL A FEW DEGREES THROUGH THE PERIOD. GILCHRIST

.MSO...NONE.

...7-DAY SPOT TEMPS AND POPS...
LIB BEB 050/084 049/078 050/077 39013331
     BUBB 048/079 047/077 045/077 044/076 3310000101
FCA BEB 046/078 045/074 046/074 39013332
     BBBB 045/076 044/075 043/074 042/073 3310000001
POL BEB 052/075 051/072 052/077 39013232
     BBBB 051/079 050/076 048/076 047/075 3310000001
MSO BBB 048/077 047/075 048/077 39013121
     BUUB 047/079 046/078 046/076 045/076 3310000001
HMM BBB 051/077 050/073 051/075 39123121
     BUUB 047/078 046/077 047/075 046/075 3310000001
BTM BBB 041/073 040/071 041/073 39223131
     BUUB 042/075 042/075 041/074 040/072 3310000001
ORO BEU 056/085 055/080 056/080 39123120
     BUUB 057/086 055/083 054/082 053/081 3300000101
GRV BBU 053/080 052/075 053/075 39223120
     BUUB 053/081 050/078 050/077 049/076 3300000101
SMN BBU 045/078 044/074 045/075 39323131
     BUUB 046/078 045/078 045/078 044/076 3310000001

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.