Alert archive / Idaho / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 22, NWS Pocatello, ID

August 3, 2002Bingham County, Blaine County, Power County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Aug 3, 2002, 5:19 PM MDT for Bingham County, Blaine County, Power 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 outline as issued.

The facts

Issued: Aug 3, 2002, 5:19 PM MDT (23:19 UTC)
Expired: Aug 3, 2002, 6:00 PM MDT
In force: 41 min
Issued by: NWS Pocatello, ID
Area: Counties, with a storm outline in the text

Counties Bingham County, ID, Blaine County, ID, Power County, ID

The radar

The Pocatello radar (KSFX), 39 km from the middle of the area, began a volume at 23:21 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 11.3 hours before the alert went out and 248 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: 69 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 1767 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 59 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.

475 
WUUS55 KPIH 032319
SVRPIH
IDC011-013-077-040000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
518 PM MDT SAT AUG 3 2002

THE NATIONAL WEATHER SERVICE IN POCATELLO/IDAHO FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN POWER COUNTY IN SOUTHEAST IDAHO
  SOUTHWESTERN BINGHAM COUNTY IN SOUTHEAST IDAHO
  SOUTHEASTERN BLAINE COUNTY IN SOUTHEAST IDAHO

* UNTIL 600 PM MDT

* AT 518 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 25 MILES WEST OF ABERDEEN TO 22
  MILES WEST OF AMERICAN FALLS...OR FROM 25 MILES WEST OF ABERDEEN TO
  21 MILES EAST OF RUPERT...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  AMERICAN FALLS...ABERDEEN...BETWEEN 545 AND 600 PM MDT.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN POCATELLO/IDAHO FALLS.

LAT...LON 4300 11343 4286 11333 4275 11332 4257 11331
          4264 11256 4282 11256 4293 11257 4307 11268

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 Pocatello, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 3, 2:55 PM MDT, 2 hours 24 minutes earlier.

Area forecast discussion, Aug 3, 2:55 PM MDT, 2 hours 24 minutes before

SOUTHEAST IDAHO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
255 PM MDT SAT AUG 3 2002

LOW PRESSURE SYSTEM REDEVELOPING SOUTHWARD ALONG THE WASHINGTON COAST
WITH FLOW ALOFT OVER SOUTHEAST IDAHO BACKING TO SOUTHWEST.  ONE
EMBEDDED DISTURBANCE IN THIS FLOW TRIGGERING SCATTERED LIGHT RAIN
SHOWERS AND ISOLATED THUNDERSTORMS FROM NEAR AMERICAN FALLS TO ISLAND
PARK.  THESE SHOWERS WILL MOVE NORTHEAST THROUGH MID AFTERNOON.
SECOND DISTURBANCE IN WESTERN NEVADA MOVING THIS WAY AND WILL REACH
FORECAST AREA LATER THIS EVENING.  RADAR AND SATELLITE INDICATED
THUNDERSTORMS DEVELOPING IN OWYHEE COUNTY AT THE MOMENT.  EXPECT
SHOWERS TO TRACK FROM TWIN FALLS AREA TO ISLAND PARK BETWEEN 600 PM
AND MIDNIGHT.  LITTLE IN THE WAY OF MEASURABLE RAIN REPORTED SO FAR.
EMBEDDED FEATURES SUPPORTED BY CAPE 300 TO 700 J/KG THIS AFTERNOON AND
SOME SPEED DIVERGENCE ALOFT THAT APPEARS TO INCREASE AS JET SKIRTS
ALONG THROUGH SOUTHERN CANADA. 12Z 700 AND 500MB PLOTS INDICATED SOME
WARM ADVECTION THAT MESOETA PICKS UP ON AND STABILIZES AIRMASS SOME
DURING THE AFTERNOON.  TOWARDS MIDNIGHT TONIGHT H3 65KT JET
MAX ALSO MOVES UP THROUGH CENTRAL NEVADA. PER ETA AND MESOETA SHOWERS
LINGER THROUGH AROUND MID DAY SUNDAY WITH AIRMASS BEGINNING TO DRY OUT
DURING THE AFTERNOON.

EXTENDED MODELS STILL SHEAR LOW OFF WASHINGTON COAST TO THE NORTHEAST
TUESDAY AND WEDNESDAY.  LITTLE MOVEMENT OF THIS TROUGH INLAND BUT JUST
ENOUGH SHIFT IN PATTERN TO PLACE SOUTHEAST IDAHO IN DRY POCKET BETWEEN
TROUGH AND MONSOON MOISTURE ANGLED THROUGH FOUR CORNERS AND COLORADO.
WITH TROUGH LIFTING NORTHEAST...AVN/MRF TRIES TO BUILD RIDGE BACK TO
THE WEST AROUND THURSDAY.  COULD BE SLIGHT CHANCE OF THUNDERSTORMS IN
SOUTHEAST CORNER OF CWA.  WILL KEEP FORECAST JUST PARTLY CLOUDY FOR
NOW. SURVICK

.KSFX...OPERATIONAL...VCP 21.

BYI 58/87/56/84 3210

.PIH...NONE.

PIH BB 055/088 052/087 052 08321

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 4:46 PM MDT	Tornado Warning	PIH	Blaine, Minidoka	29 min
Aug 3, 5:33 PM MDT	Severe Thunderstorm Warning	PIH	Butte	57 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.