Alert archive / Idaho / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 53, NWS Pocatello, ID

July 4, 2004Teton County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jul 4, 2004, 8:41 PM MDT for Teton County, Idaho. It was in force for 34 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: Jul 4, 2004, 8:41 PM MDT (02:41 UTC)
Expired: Jul 4, 2004, 9:15 PM MDT
In force: 34 min
Issued by: NWS Pocatello, ID
Area: Counties, with a storm outline in the text

County Teton County, ID

The radar

The Pocatello radar (KSFX), 148 km from the middle of the area, began a volume at 02:43 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

Riverton, WY (KRIW), launched 00:00Z, 2.7 hours before the alert went out and 218 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: 118 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 2052 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KPIH 050241
SVRPIH
IDC081-050315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
841 PM MDT SUN JUL 4 2004

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

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN TETON COUNTY IN IDAHO

* UNTIL 915 PM MDT

* AT 833 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DIME SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  VICTOR...OR ABOUT 9 MILES SOUTH OF DRIGGS...AND MOVING EAST AT 35
  MPH.

LAT...LON 4369 11127 4352 11128 4347 11059 4370 11057

$$

KS

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 Jul 4, 3:20 PM MDT, 5 hours 21 minutes earlier.

Area forecast discussion, Jul 4, 3:20 PM MDT, 5 hours 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
320 PM MDT SUN JUL 4 2004

.DISCUSSION...
REMNANTS OF SURFACE FRONT SHIFTING SOUTH FROM SODA SPRINGS TO MALTA
LINE WITH ISOLATED THUNDERSTORMS DEVELOPING OVER IT. FRONT SHOULD
SLIP SOUTH OF STATE NEXT TWO HOURS. H3 80KT JET CORE PROPAGATING
FROM WASHINGTON STATE OVER CENTRAL IDAHO THROUGH MONDAY MORNING.
WATER VAPOR IMAGERY SHOWS FAIRLY SIGNIFICANT VORTICITY MAX OVER
SOUTHERN BRITISH COLUMBIA THAT WILL SLIDE ROUGHLY THROUGH ISLAND
PARK AREA BY MONDAY MORNING. THE JET WILL BRING IN SOME DRYING AND
SUBSIDENCE THROUGH THE AFTERNOON WITH BEST EFFECTS FELT SOUTH OF A
LINE FROM SUN VALLEY TO BLACKFOOT. LIMITED SCOURING OF VALLEY
MOISTURE EXPECTED LATE THIS AFTERNOON AS SURFACE LOW PRESSURE
DEVELOPS OVER CENTRAL MOUNTAINS FROM INFLUENCE OF UPPER JET. THIS
SHOULD TIGHTEN SURFACE PRESSURE GRADIENT AND INCREASE WINDS FROM THE
EASTERN MAGIC VALLEY INTO THE LOWER SNAKE PLAIN. STRENGTH OF WINDS
SHOULD BE 10 TO 20 MPH WITH GUSTS TO 25 MPH...DECREASING TO 5 TO 15
MPH AS EVENING 4TH OF JULY FESTIVITIES APPROACH.

SURFACE LOW THAT FORMS OVER CENTRAL MOUNTAINS PER MESOETA COULD SLIP
INTO THE UPPER VALLEY WITH NORTHERLY H7 WINDS ALOFT FORCING WEAK
CONVERGENCE AROUND ARCO TO IDAHO FALLS. THAT ADDS ANOTHER DIMENSION
TO RISK OF EVENING THUNDERSTORMS. HOPEFULLY THE UPPER LEVEL SUPPORT
SHOULD MOVE FAR ENOUGH EAST BY THEN.

FLAT SHORT WAVE RIDGE BUILDS IN ON MONDAY AND TUESDAY FOR A MOSTLY
DRY FORECAST. SOME INSTABILITY LINGERS IN ISLAND PARK AREA. WITH
RESPECT TO LOW PRESSURE SYSTEM MOVING INTO SOUTHERN BRITISH COLUMBIA
THURSDAY...GFS STILL KEEP MOST MOISTURE NORTH OF FORECAST AREA.
HOWEVER...TROUGH EXTENDS WELL SOUTH INTO CALIFORNIA AND FLOW PATTERN
MAY BRING MINOR EMBEDDED DISTURBANCES UP FROM THE SOUTHWEST TO SET
OFF ISOLATED AFTERNOON THUNDERSTORMS.  OTHERWISE REST OF FORECAST
LOOKS ON TRACK.

&&

.PIH WATCHES/WARNING/ADVISORIES...NONE.
&&

SURVICK

Hazardous weather outlook, Jul 4, 6:10 AM MDT, 14 hours 31 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE POCATELLO ID
610 AM MDT SUN JUL 04 2004

IDZ017>023-031-032-051200-
EASTERN MAGIC VALLEY-BIG AND LITTLE WOOD RIVER REGION-
SAWTOOTH MOUNTAINS-LOST RIVER/PAHSIMEROI-UPPER SNAKE HIGHLANDS-
UPPER SNAKE RIVER PLAIN-LOWER SNAKE RIVER PLAIN-
SOUTH CENTRAL HIGHLANDS-CARIBOU HIGHLANDS-
610 AM MDT SUN JUL 04 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO

.DAY ONE...
ISOLATED THUNDERSTORMS WILL DEVELOP ACROSS THE REGION THIS
AFTERNOON...AND CONTINUE INTO THE EVENING.  SMALL HAIL AND GUSTY
WINDS ARE POSSIBLE WITH SOME OF THE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...
NO HAZARDOUS WEATHER CONDITIONS EXPECTED.

SPOTTER INFORMATION STATEMENT...
WE ASK ALL TRAINED SPOTTERS TO REPORT SIGNIFICANT WEATHER
CONDITIONS. THIS WOULD INCLUDE ALL HAIL...WIND AND HEAVY RAIN
REPORTS.  THIS INFORMATION SHOULD BE CALLED INTO THE LOCAL NATIONAL
WEATHER SERVICE OFFICE IN POCATELLO USING THE 1-800 SEVERE WEATHER
HOTLINE...OR OTHER STANDARD OPERATING PROCEDURES.

In the hours before

Local storm report, Jul 4, 3:36 PM MDT, 5 hours 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
336 PM MDT SUN JUL 04 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0327 PM     HAIL             N SHELLEY               43.38N 112.12W
07/04/2004  0.88 INCH        BINGHAM            ID   TRAINED SPOTTER

            NICKEL-SIZE HAIL REPORTED FALLING AT 327 PM.

&&

GEW

Local storm report, Jul 4, 4:22 PM MDT, 4 hours 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
422 PM MDT SUN JUL 04 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0354 PM     HAIL             1 W SHELLEY             43.38N 112.14W
07/04/2004  0.75 INCH        BINGHAM            ID   TRAINED SPOTTER

            3/4 INCH HAIL REPORTED WEST OF SHELLEY, ID FALLING FROM
            326PM TO 341PM.

0354 PM     HAIL             1 E SHELLEY             43.38N 112.10W
07/04/2004  0.75 INCH        BINGHAM            ID   TRAINED SPOTTER

            3/4 INCH HAIL REPORTED EAST OF SHELLEY, ID FALLING FROM
            342PM TO 352PM

0354 PM     HAIL             2 N SHELLEY             43.41N 112.12W
07/04/2004  0.88 INCH        BINGHAM            ID   TRAINED SPOTTER

            7/8 INCH HAIL REPORTED AT SHELLEY, ID FALLING FROM 327PM
            TO 334PM AND COVERED GRASSY AREAS 3/4 TO 1 INCH DEEP AND
            FOLLOWED BY VERY HEAVY RAIN.

&&

GEW

Local storm report, Jul 4, 7:26 PM MDT, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
726 PM MDT SUN JUL 04 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0715 PM     HAIL             RIGBY                   43.67N 111.92W
07/04/2004  0.25 INCH        JEFFERSON          ID   TRAINED SPOTTER

            3 MINUTES OF HAIL STORM. 0.13 INCHES OF WATER IN SHORT
            PERIOD.

&&

PJA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 7:35 PM MDT	Severe Thunderstorm Warning	PIH	Teton	25 min
Jul 4, 7:40 PM MDT	Severe Thunderstorm Warning	PIH	Madison	35 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2004 Every severe thunderstorm warning in 2004

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.