Alert archive / Idaho / Severe Thunderstorm Watches in 1998

Severe Thunderstorm Watch 430

May 26, 199813 counties in Idaho; 10 counties in Utah; Lincoln County, Teton County, Uinta County, Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at May 26, 1998, 12:00 PM MDT for 13 counties in Idaho; 10 counties in Utah; Lincoln County, Teton County, Uinta County, Wyoming. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 26, 1998, 12:00 PM MDT (18:00 UTC)
Expired: May 26, 1998, 5:00 PM MDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 26 counties

Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Bonneville County, ID, Caribou County, ID, Clark County, ID, Franklin County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Oneida County, ID, Power County, ID, Teton County, ID, Box Elder County, UT, Cache County, UT, Davis County, UT, Duchesne County, UT, Morgan County, UT, Rich County, UT, Salt Lake County, UT, Summit County, UT, Wasatch County, UT, Weber County, UT, Lincoln County, WY, Teton County, WY, Uinta County, WY

The radar

The Salt Lake City radar (KMTX), 84 km from the middle of the area, began a volume at 18:00 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.

Warnings issued inside it

1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 26, 4:00 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville	30 min

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 6.0 hours before the alert went out and 124 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: 2545 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 165 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.

129 
WWUS9 KMKC 261720
SEL0  
MKC WW 261720
WYZ000-UTZ000-IDZ000-262300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 430
STORM PREDICTION CENTER NORMAN OK
1120 AM MDT TUE MAY 26 1998

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WESTERN WYOMING                            
   NORTHERN UTAH                               
   SOUTHEAST IDAHO                              

EFFECTIVE THIS TUESDAY AFTERNOON FROM NOON MDT UNTIL 500 PM MDT.

HAIL TO 1 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
EITHER SIDE OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF SALT LAKE
CITY UTAH TO 70 MILES NORTH NORTHEAST OF IDAHO FALLS IDAHO.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.


DISCUSSION...STRONG UPPER TROF AND ASSOCIATED VIGOROUS COLD FRONT
WILL SWEEP NEWD ACROSS AREA AS SURFACE LOW NOW NWRN UT MOVES NWD
ACROSS SERN ID.  AIRMASS HAS BECOME MARGINALLY UNSTABLE SUPPORTING
STRONG THUNDERSTORM DEVELOPMENT.  STORMS COUPLED WITH STRONG FRONT
WILL RESULT IN POTENTIAL DAMAGING WINDS.  


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.  MEAN STORM
MOTION VECTOR 21045.


...HALES

401,1130 442,1130 442,1100 400,1101

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 2:00 PM MDT	Tornado Watch	SPC	Campbell, Converse, Crook, Goshen, Johnson, Laramie and 4 more	6 hr

Nearby

Severe Thunderstorm Watches in Idaho, 1998 Severe Thunderstorm Watches in Utah, 1998 Severe Thunderstorm Watches in Wyoming, 1998 Every severe thunderstorm watch in 1998

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.