Alert archive / Idaho / Tornado Warnings in 1987

Tornado Warning 2, NWS Pocatello, ID

July 29, 1987Bonneville County, Idaho

NWS Pocatello, ID issued this tornado warning at Jul 29, 1987, 7:54 PM MDT for Bonneville County, Idaho. It was in force for 21 min.

The area

The counties it named.

The facts

Issued: Jul 29, 1987, 7:54 PM MDT (01:54 UTC)
Expired: Jul 29, 1987, 8:15 PM MDT
In force: 21 min
Issued by: NWS Pocatello, ID
Area: Whole counties

County Bonneville County, ID

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Lander/Hunt Fiel, WY (KLND), launched 00:00Z, 1.9 hours before the alert went out and 245 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2672 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 29, 3:31 PM MDT, 4 hours 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO, ID
330 PM MDT WED JUL 29 1987

           ...URBAN FLOODING IN POCATELLO...

SLOW MOVING...HEAVY THUNDERSHOWERS ARE HAMMERING BANNOCK AND POWER
COUNTIES OF EASTERN IDAHO THIS AFTERNOON.

URBAN FLOODING IS REPORTED IN POCATELLO WITH SEVERAL CARS STALLED
IN THE CENTER STREET UNDERPASS.

A FLASH FLOOD WATCH IS IN EFFECT UNTIL 9 PM MDT THIS EVENING.

TRAVELERS OR PERSONS ENGAGED IN OUTDOOR ACTIVITIES SHOULD BE ALERT
TO THE POSSIBILITY OF MORE HEAVY DOWNPOURS THIS AFTERNOON AND EVENING.
AVOID DRIVING ACROSS STREAM COVERED ROADWAYS AND AND DO NOT ENTER
LOW LYING UNDERPASSES CARRYING WATER.

LISTEN TO NOAA WEATHER RADIO OR COMMERCIAL STATIONS FOR UPDATES.
GLODO

Local storm report, Jul 29, 3:54 PM MDT, 4 hours before

STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
345  PM MDT WED JUL 29 1987

TIME             EVENT

153 PM           USFS DISPATCHER RELAYED REPORT OF TWO FUNNEL CLOUDS
                 VISIBLE BETWEEN LEADORE AND GILMORE IN LEMHI COUNTY.

205 PM           SPOTTER AT ROCKALND 2S REPORTED 1.2 INCHES OF RAIN
                 IN 30 MINUTES.  COUNTY ROADS UNDER WATER.
215 PM           ISSUED FLASH FLOOD WARNING FOR POWER COUNTY..CO/
                 ORDINATED WITH WSFO/BOISE.  FURTHER CONSULTATION
                 WITH USFS.  FUNNEL CLOUDS DID NOT TOUCH GROUND AND
                 WERE IN A REMOTE AREA.
250 PM           WSFO/BOI ISSUED FLASH FLOOD WATCH EFFECTIVE UNTIL
                 915 PM.

315 PM           URBAN FLOODING REPORTED IN POCATELLO.  SEVERAL
                 STALLED CARS.  ISSUED SPS FOR URBAN FLOODING 330PM.

Special weather statement, Jul 29, 6:06 PM MDT, 1 hour 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO, ID
600 PM MDT WED JUL 29 1987

...THUNDERSHOWERS BUILDING IN SOUTHEAST IDAHO...

AN AREA OF STRONG THUNDERSHOWERS IS BUILDING IN SOUTHERN BUTTE COUNTY..
SOUTH OF ARCO.  THIS CLUSTER OF THUNDERSHOWERS IS PRODUCING FREQUENT
LIGHTNING AND HEAVY RAIN.  THE THUNDERSHOWERS WERE MOVING SLOWLY TO
THE NORTHEAST.

ANOTHER AREA OF THUNDERSHOWERS IS MOVING INTO SOUTHWESTERN SECTIONS OF
SOUTHEAST IDAHO.  THE LEADING EDGE OF THIS AREA OF THUNDERSHOWERS IS
MOVING THROUGH POWER AND ONEIDA COUNTIES.  THESE THUNDERSHOWERS ARE
ALSO MOVING SLOWLY TO THE NORTHEAST...PRODUCING FREQUENT LIGHTNING AND
PERIODS OF HEAVY RAIN.

RESIDENTS IN SOUTHEAST IDAHO ARE URGED TO BE ON THE LOOKOUT FOR
THREATENING SKIES AND BE PREPARED TO TAKE PROTECTIVE ACTION.

SOUTHEAST IDAHO REMAINS UNDER A FLASH FLOOD WATCH UNTIL 9:00PM THIS
EVENING.  STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE COMMERCIAL
RADIO OR TTV STATION FOR FURTHER UPDATES OR STATEMENTS.
END...WSO
KEIRNS

Nearby

Tornado Warnings in Idaho, 1987 Every tornado warning in 1987 Tornadoes in 1987

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.