Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 66, NWS Salt Lake City, UT

August 10, 1997Box Elder County, Davis County, Weber County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 10, 1997, 8:15 PM MDT for Box Elder County, Davis County, Weber County, Utah. It was in force for 75 min. 2 reports 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: Aug 10, 1997, 8:15 PM MDT (02:15 UTC)
Expired: Aug 10, 1997, 9:30 PM MDT
In force: 75 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties

Counties Box Elder County, UT, Davis County, UT, Weber County, UT

The radar

The Salt Lake City radar (KMTX), 7 km from the middle of the area, began a volume at 02:19 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.

What was reported inside it

Time	Report	Where	Remark
Aug 10, 8:40 PM MDT	Thunderstorm Wind 58	(Bmc)Brigham City Ar, UT
Aug 10, 8:40 PM MDT	Thunderstorm Wind 52	Harrisville, UT

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

Salt Lake City I, UT (KSLC), launched 00:00Z, 2.3 hours before the alert went out and 66 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: 1020 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 2105 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSLC 110221 RRA
SVRSLC
UTC003-011-057-110340-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
815 PM MDT SUN AUG 10 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 930 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN NORTHWESTERN UTAH

   ...EASTERN BOX ELDER COUNTY
   ...NORTHERN DAVIS COUNTY
   ...WEBER COUNTY
 
AT 800 PM MDT A LINE OF SEVERE THUNDERSTORMS OVER CENTRAL BOX
ELDER COUNTY CONTINUES TO MOVE TOWARDS THE NORTHERN WASATCH FRONT.
THIS LINE OF THUNDERSTORMS IS EXPECTED TO AFFECT THE FOLLOWING
LOCATIONS...

BRIGHAM CITY ... AT AROUND 845 PM MDT
OGDEN .......... AT AROUND 900 PM MDT

LARGE HAIL AND WINDS TO 60 MPH CAN BE EXPECTED FROM THESE STORMS AS
THEY MOVE FROM CENTRAL BOX ELDER COUNTY INTO THE NORTHERN WASATCH
FRONT.


THIS NEW WARNING COMBINES THE PREVIOUS TWO WARNINGS THAT WERE
IN EFFECT FOR PARTS OFN BOX ELDER COUNTY.
 

&

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 6:15 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Tooele	55 min
Aug 10, 7:10 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Tooele
Aug 10, 7:10 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Tooele	60 min
Aug 10, 7:29 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	61 min
Aug 10, 9:33 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Morgan, Summit, Weber	47 min
Aug 10, 10:03 PM MDT	Severe Thunderstorm Warning	SLC	Salt Lake, Utah	42 min
Aug 11, 3:34 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	46 min
Aug 11, 3:43 PM MDT	Flash Flood Warning	SLC	Garfield	3 hr
Aug 11, 5:59 PM MDT	Flash Flood Warning	SLC	Garfield	46 min
Aug 11, 5:59 PM MDT	Severe Thunderstorm Warning	SLC	Garfield	46 min

Nearby

Severe Thunderstorm Warnings in Utah, 1997 Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.