Alert archive / Utah / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 52, NWS Salt Lake City, UT

August 14, 2001Garfield County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 14, 2001, 4:26 PM MDT for Garfield County, Utah. It was in force for 34 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: Aug 14, 2001, 4:26 PM MDT (22:26 UTC)
Expired: Aug 14, 2001, 5:00 PM MDT
In force: 34 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Garfield County, UT

The radar

The Cedar City radar (KICX), 121 km from the middle of the area, began a volume at 22:30 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 14, 4:30 PM MDT	Hail 1.5	Escalante, UT	A severe thunderstorm dropped 1 inch to 1.5 inch hail on Escalante...along with brief heavy rain.

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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.4 hours before the alert went out and 280 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: 342 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1039 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 23 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.

570 
WUUS55 KSLC 142227
SVRSLC
UTC017-142300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
426 PM MDT TUE AUG 14 2001

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL GARFIELD COUNTY IN UTAH
  THIS INCLUDES THE CITY OF ESCALANTE

* UNTIL 500 PM MDT

* AT 418 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
A   SEVERE THUNDERSTORM OVER ESCALANTE...MOVING SOUTH AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
OVER RURAL SOUTHERN GARFIELD COUNTY AT 440 PM MDT

HAIL UP TO ONE INCH IN DIAMETER HAS BEEN REPORTED WITH THIS STORM. 
IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND 
MOVE TO A SUBSTANTIAL SHELTER.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN SALT LAKE CITY.

LAT...LON 3788 11145 3780 11170 3755 11161 3756 11131

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 Salt Lake City, UT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 14, 2:45 PM MDT, 1 hour 41 minutes earlier.

Area forecast discussion, Aug 14, 2:45 PM MDT, 1 hour 41 minutes before

UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
245 PM MDT TUE AUG 14 2001

SYNOPSIS...HIGH PRESSURE AND A GENERALLY DRY AIRMASS WILL REMAIN
OVER THE REGION INTO THE WEEKEND.  TEMPERATURES WILL BE ON A SLIGHT
WARMING TREND THROUGH FRIDAY.

DISCUSSION...THE MEAN RIDGE WILL REMAIN OVER THE WESTERN U.S. INTO
NEXT WEEK.  UTAH WILL BE UNDER A LIGHT NORTHWESTERLY FLOW THROUGH
THURSDAY...THEN COME UNDER A LIGHT SOUTHWESTERLY FLOW FRIDAY AS THE
UPPER RIDGE AXIS SHIFTS OVERHEAD.  TEMPERATURES WILL BE ON A VERY
SLOW WARMING TREND WITH A COUPLE DEGREES OF WARMING EACH OF THE NEXT
COUPLE OF DAYS.  WIDELY SCATTERED CONVECTION DEVELOPED OVER THE MTNS
THIS AFTERNOON...AND SHOULD GO TO BED QUICKLY THIS EVENING.  THE
MODELS ARE PICKING UP ON A VERY WEAK SHORTWAVE MOVING INTO NW UTAH
LATE TONIGHT AND THROUGH UTAH WEDNESDAY...BUT WITH THE DRYING
AIRMASS AND GENERAL HIGH PRESSURE WONT LEAVE ANYTHING IN OTHER THAN
SLIGHT CHANCE NW CORNER TONIGHT...AND SLIGHT CHANCE MTNS WEDNESDAY.

THE EXTENDED LOOKS DRY WITH CONTINUED ABOVE NORMAL TEMPERATURES.  AN
EAST-WEST ELONGATED UPPER LEVEL RIDGE AXIS WILL REMAIN OVER THE
SOUTHWEST THROUGH AT LEAST SUNDAY PREVENTING ANY RETURN OF MONSOONAL
MOISTURE.  THE MRF TRIES TO AMPLIFY THE RIDGE AND SHIFT IT EAST TO
THE FOUR-CORNERS AREA MONDAY AND TUESDAY AS A TROF DEVELOPS OVER THE
PAC NW.  THIS COULD POSSIBLY ALLOW A LITTLE MOISTURE RETURN INTO SE
UTAH...AND SO HAVE ADDED SLIGHT CHANCE TO S MTNS AND SE VALLEYS.

SLC 11-0  CDC 11-0  HOGAN

.SLC...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 12:49 AM MDT	Flash Flood Warning	SLC	Iron	41 min
Aug 14, 4:03 PM MDT	Severe Thunderstorm Warning	SLC	Kane	42 min
Aug 14, 4:50 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	40 min
Aug 14, 4:55 PM MDT	Flash Flood Warning	SLC	Kane	80 min
Aug 14, 5:00 PM MDT	Severe Thunderstorm Warning	SLC	Garfield, Kane	45 min

Nearby

Severe Thunderstorm Warnings in Utah, 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; radar from the NEXRAD Level II archive.