Alert archive / California / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 1, NWS Reno, NV

May 24, 1999Nevada County, California

NWS Reno, NV issued this severe thunderstorm warning at May 24, 1999, 5:50 PM PDT for Nevada County, California. It was in force for 40 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 24, 1999, 5:50 PM PDT (00:50 UTC)
Expired: May 24, 1999, 6:30 PM PDT
In force: 40 min
Issued by: NWS Reno, NV
Area: Whole counties

County Nevada County, CA

What was reported inside it

Time	Report	Where	Remark
May 24, 6:00 PM PDT	Hail 1	Truckee, CA	Nevada County Sheriff reported "large" hail on Interstate 80 between Truckee and Donner Summit. Traffic was temporarily stopped. No confirmed reports of hail size other than Doppler Radar estimates exceeding 1.00 inch.

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

Reno, NV (KREV), launched 00:00Z, 0.8 hours before the alert went out and 223 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: 34 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 3209 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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.

NWS Reno, NV wrote its last area forecast discussion before this severe thunderstorm warning went out at May 24, 2:45 PM PDT, 3 hours 5 minutes earlier.

Area forecast discussion, May 24, 2:45 PM PDT, 3 hours 5 minutes before

WESTERN NEVADA AND EASTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
245 PM PDT MON MAY 24 1999

AFTN CONVECTION OVR MOST OF THE CWA EXCEPT FOR THE NORTHERN ZONES.
ACTIVITY LIKELY TO CONT THRU THE EVE HOURS.  MODELS SLOWLY MOVING
UPPER LOW E INTO UTAH BY 48HRS.  THIS SHOULD SLOWLY DRY AND STABILIZE
THE AIRMASS OVR THE CWA.  WILL KEEP SOME ISOLATED TSTMS IN THE FCST
OVER THE SRN TWO-THIRDS OF THE CWA AS THE SUSANVILLE AND NRN WASHOE
COUNTY ZONES WILL BE UNDER THE RIDGE AXIS.  THEN BY WED THE HI PRES
RIDGE SHOULD BE THE DOMINATE FEATURE AND AIRMASS WILL BE DRY AND
STABLE.  MODELS ARE FCSTG A TROF IN THE ERN PACIFIC TO APPROACH THE
COAST ON WED. THIS SHOULD INCREASE THE WRLY FLOW OVER WRN NV.  PROGS I
THINK ARE OVER FCSTG THE INSTABILITY IN NE CALIF AND EXTREME NW NV.
WILL KEEP WED DRY OVR THE CWA.  THE TROF MOVES INTO NV BY FRI SO SOME
SLIGHT COOLING BUT NO PRECIP FCST IN THE EXTENDED PERIOD.

.REV...EASTERN CALIFORNIA...NONE.
       WESTERN NEVADA...NONE.

In the hours before

Local storm report, May 24, 4:30 PM PDT, 1 hour 20 minutes before

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The office that day

Everything else NWS Reno, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 24, 7:26 PM PDT	Severe Thunderstorm Warning	REV	Plumas, Sierra	44 min

Nearby

Severe Thunderstorm Warnings in California, 1999 Every severe thunderstorm warning in 1999

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.