Alert archive / Idaho / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 10, NWS Pocatello, ID

July 19, 2002Bannock County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jul 19, 2002, 1:38 PM MDT for Bannock County, Idaho. It was in force for 37 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 19, 2002, 1:38 PM MDT (19:38 UTC)
Expired: Jul 19, 2002, 2:15 PM MDT
In force: 37 min
Issued by: NWS Pocatello, ID
Area: Counties, with a storm outline in the text

County Bannock County, ID

The radar

The Pocatello radar (KSFX), 46 km from the middle of the area, began a volume at 19:41 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, 7.6 hours before the alert went out and 225 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: 241 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1586 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

171 
WUUS55 KPIH 191938
SVRPIH
IDC005-192015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
138 PM MDT FRI JUL 19 2002

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

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL BANNOCK COUNTY IN SOUTHEAST IDAHO

* UNTIL 215 PM MDT

* AT 131 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 11 MILES SOUTHWEST OF INKOM...OR ABOUT 13 MILES
  SOUTH OF POCATELLO...MOVING NORTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  INKOM AT 215 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 4279 11248 4258 11238 4278 11209 4293 11232

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 19, 9:35 AM MDT, 4 hours 3 minutes earlier.

Area forecast discussion, Jul 19, 9:35 AM MDT, 4 hours 3 minutes before

SOUTHEAST IDAHO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
935 AM MDT FRI JUL 19 2002

JUICY AIRMASS IN PLACE THIS MORNING ACROSS CWFA WITH SFC DEWPTS IN
THE 50S (58 AT KPIH AND KIDA).  SLC SOUNDING CONTINUES TO CARRY PW
OVER 1 INCH...AND THUS SHOULD STAY MOIST THROUGH DAY DESPITE 12Z
MESOETA TRYING TO DRY OUT PWS OVER CWFA.  SHOWERS ALREADY FIRING IN
SNAKE VALLEY NEAR KMUO AHEAD OF MAIN S/WV TRACKING NORTHEAST OUT OF
WRN NV.  THIS TREND LIKELY TO CONTINUE THROUGH REMAINDER OF MORNING
BEFORE BEST INSTABILITY HITS MID AFTERNOON. INVISION ANOTHER
SCENARIO LIKE YDAY WITH SCT TO NMRS SLOW MOVING TSTORMS WITH START
OF BEST CONVECTION OVR MTN TERRAIN. LOCALLY HEAVY RAINS ARE AGAIN
POSSIBLE...BUT WONT BE WIDESPREAD ENOUGH FOR A FLASH FLOOD WATCH.
CURRENT FCST IN GOOD SHAPE OVERALL...WILL BRING A ZONE OR TWO
CURRENT BUT NO OTHER CHANGES PLANNED AT THIS TIME.  DMH

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

BYI 85/56/84 221

.PIH...NONE.

PIH BB 087/055 086/051 085 04221

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 6:26 PM MDT	Severe Thunderstorm Warning	PIH	Fremont	64 min
Jul 19, 2:18 PM MDT	Severe Thunderstorm Warning	PIH	Bingham	27 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.