Alert archive / Idaho / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 2, NWS Pocatello, ID

May 21, 1986Bannock County, Oneida County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at May 21, 1986, 3:30 PM MDT for Bannock County, Oneida County, Idaho. It was in force for 90 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 21, 1986, 3:30 PM MDT (21:30 UTC)
Expired: May 21, 1986, 5:00 PM MDT
In force: 90 min
Issued by: NWS Pocatello, ID
Area: Whole counties

Counties Bannock County, ID, Oneida County, ID

The radar

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

What was reported inside it

Time	Report	Where	Remark
May 21, 4:30 PM MDT	Tornado F1	Oneida, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 9.5 hours before the alert went out and 188 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: 2094 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 271 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 severe thunderstorm 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, May 21, 2:31 PM MDT, 59 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO, ID
230 PM MDT WED MAY 21 1986

  ...COOLER AIR...GUSTY WINDS MOVING INTO SOUTHEAST IDAHO...AGAIN...

COOLER AIR AND GUSTY WESTERLY WINDS ARE MOVING INTO SOUTHEAST IDAHO
THIS AFTERNOON...ALONG A COLD FRONT THAT EXTENDED FROM  NEAR SALMON
TO NEAR BURLEY AT 230 PM MDT.

TEMPERATURES ARE ALREADY DROPPING AT POCATELLO AIRPORT AND SKIES ARE
DARKENING TO THE WEST.  A HIGH OF 60 DEGREES WAS REACHED NEAR NOON.

THE MAIN FRONT WITH STRONG GUSTY WINDS AND COOLER  TEMPERATURES WILL
LIKELY REACH POCATELLO AND THE UPPER SNAKE RIVER VALLEY WITHIN THE
NEXT HOUR OR TWO.  RAIN WILL ACCOMPANY THE SYSTEM...BECOMING MIXED
WITH SNOW AT HIGHER ELEVATIO=NS TONIGHT.

GLODO

Special weather statement, May 21, 3:06 PM MDT, 24 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO, ID
257 PM MDT WED MAY 21 1986

      ...RADAR REPORTS STORM APPROACHING ONEIDA COUNTY...

WEATHER RADAR INDICATES A THUNDERSTORM WITH POSSIBLE STRONG WINDS
AND BRIEF HEAVY RAINS ABOUT 35 MILES SOUTHWEST OF MALAD CITY IDAHO...
MOVING NORTHWEST AT ABOUT 25 MILES AN HOUR.

THIS WILL BRING THE STORM INTO ONEIDA COUNTY AND MALAD CITY WITHIN
THE NEXT HOUR OR SO...BETWEEN 3 AND 4 PM MDT.

RESIDENTS ARE ADVISED TO BE PREPARED FOR STRONG WINDS WITH POSSIBLY
HEAVY RAINFALL.

STAY TUNED TO RADIO OR TELEVISON STATIONS FOR ADDITONAL STATEMENTS
OR WARNINGS IF NEEDED.  PLEASE REPORT DAMAGING WINDS OR SEVERE
WEATHER TO LOCAL LAW ENFORECEMENT AYGENCIES OR DIRECTLY TO THE
NWS AT...POCATELLO 208-236-6901 OR  BOISE 208-334-9860.
GLODO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 6:25 PM MDT	Severe Thunderstorm Warning	PIH	Fremont	65 min
May 21, 5:40 PM MDT	Tornado Warning	PIH	Franklin, Oneida	50 min

Nearby

Severe Thunderstorm Warnings in Idaho, 1986 Every severe thunderstorm warning in 1986

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.