Alert archive / Idaho / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 17, NWS Pocatello, ID

July 15, 2001Cassia County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jul 15, 2001, 2:21 PM MDT for Cassia County, Idaho. It was in force for 24 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jul 15, 2001, 2:21 PM MDT (20:21 UTC)
Expired: Jul 15, 2001, 2:45 PM MDT
In force: 24 min
Issued by: NWS Pocatello, ID
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cassia County, ID

What was reported inside it

Time	Report	Where	Remark
Jul 15, 2:45 PM MDT	Hail 0.75	Burley, 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

Elko, NV (KLKN), launched 12:00Z, 8.4 hours before the alert went out and 194 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: 94 J/kg
Mixed-layer CIN: -327 J/kg
Mixed-layer LCL: 2055 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 2 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.

000 
WUUS55 KPIH 152023
SVRPIH

IDC031-152045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
221 PM MDT SUN JUL 15 2001

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

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL CASSIA COUNTY IN IDAHO

* UNTIL 245 PM MDT

* AT 210 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER NORTH CENTRAL CASSIA COUNTY...OR ABOUT 10
  MILES NORTHWEST OF IDAHOME...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
THE INTERCHANGE OF I-84 AND I-86 AT 240 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 4250 11359 4246 11352 4254 11329 4265 11343

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 15, 9:55 AM MDT, 4 hours 26 minutes earlier.

Area forecast discussion, Jul 15, 9:55 AM MDT, 4 hours 26 minutes before

SOUTHEAST IDAHO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO/IDAHO FALLS ID
955 AM MDT SUN JUL 15 2001

MAIN VORT FEATURE NORTH OF WEY AND PULLING E/NE WITH UPPER DIVERGENCE
MAXIMUM.  LAPS AND AREA 88DS SHOW ECHOES MOSTLY OVER NORTHERN TIER OF
PIH CWA AND MOVING QUICKLY NORTH WITH LOCALLY STRONG CELLS TRAILING S
OVER EASTERN BLAINE COUNTY AND ARCO DESERT.  OVER SOUTHERN PART OF
AREA ENOUGH CLEARING FOR FREE CONVECTION TO DEVELOP THIS AFTERNOON.
INSTABILITY CHARTS PUT LIS -1 TO -2 OVER NORTHEAST HIGHLANDS AND UPPER
SNAKE PLAIN FOR THIS AFTERNOON.  TREND IS FOR CONTINUED SW FLOW ALOFT
AS UPPER LOW NEAR VANCOUVER ISLE AT 18Z SHIFTS SLOWLY EAST.  MEANWHILE
WEAK H8 HIGH LINGERS ALONG ID/WY BORDER.  FORECAST WILL AVERAGE OUT TO
SCATTERED POPS TODAY IN MOST LOCATIONS.  ZONES TO BE AMENDED FOR AREAL
TRENDS IN POPS.

TA

BYI 81/56/83 221

.KSFX WSR-88D...OPERATIONAL...VCP 21.

PIH EB 081/055 084/050 080 05221

.PIH...NONE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 1:38 PM MDT	Severe Thunderstorm Warning	PIH	Bannock	37 min
Jul 15, 2:25 PM MDT	Severe Thunderstorm Warning	PIH	Caribou	35 min
Jul 15, 2:49 PM MDT	Flash Flood Warning	PIH	Cassia	36 min
Jul 15, 3:28 PM MDT	Severe Thunderstorm Warning	PIH	Blaine, Cassia	32 min
Jul 15, 3:35 PM MDT	Tornado Warning	PIH	Bingham, Power	25 min
Jul 15, 4:48 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham	57 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2001 Every severe thunderstorm warning in 2001

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.