Alert archive / Nevada / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 7, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 22, 1999, 5:04 PM PDT for Nye County, Nevada. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 22, 1999, 5:04 PM PDT (00:04 UTC)
- Expired
- Aug 22, 1999, 5:45 PM PDT
- In force
- 41 min
- Issued by
- NWS Las Vegas, NV
- Area
- Whole counties
County Nye County, NV
The nearest sounding before it
Mercury/Desert R, NV (KDRA), launched 00:00Z, 0.1 hours before the alert went out and 164 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.
- Mixed-layer CAPE
- 320 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 3389 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
051 WUUS1 KLAS 230005 RRA SVRLAS NVC023-230045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTED COUNTY NATIONAL WEATHER SERVICE LAS VEGAS NV 504 PM PDT SUN AUG 22 1999 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... FAR SOUTHERN NYE COUNTY IN SOUTHERN NEVADA INCLUDING PAHRUMP AND STATE ROUTE 160 IN THE VICINITY OF PAHRUMP * UNTIL 545 PM PDT * AT 455 PM PDT...DOPPLER RADAR AND A SPOTTER IN PAHRUMP INDICATED A SEVERE THUNDERSTORM OVER PAHRUMP. THE STORM WAS MOVING NORTH AT 15-20 MPH. * DAMAGING WINDS IN EXCESS OF 60 MPH AND VERY HEAVY RAINFALL ARE LIKELY WITH THIS STORM.
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 Las Vegas, NV wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 2:50 PM PDT, 2 hours 14 minutes earlier.
Area forecast discussion, Aug 22, 2:50 PM PDT, 2 hours 14 minutes before
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 250 PM PDT SUN AUG 22 1999 SYNOPSIS...A LOW PRESSURE SYSTEM ALONG THE CALIFORNIA COAST AND A RIDGE OF HIGH PRESSURE OVER THE ROCKIES WILL MAINTAIN A FLOW OF MOIST AND UNSTABLE AIR ACROSS THE REGION INTO TUESDAY. THIS WILL RESULT IN A CONTINUED THREAT FOR AFTERNOON AND EVENING THUNDERSTORMS EACH DAY. DISCUSSION...MODELS IN GOOD AGREEMENT TODAY WITH SYNOPTIC SCALE PATTERN. CLOSED LOW OFF CENTRAL CA COAST REMAINS IN PLACE INTO MONDAY WITH RIDGE OVER THE ROCKIES. UPPER LOW THEN BEGINS TO OPEN UP AND LIFT ACROSS NRN CA MON NGT/TUE. NGM/ETA MODELS NOW CONSISTENTLY SHOWING LITTLE OR NO DRYING WITH THE DEPARTING LOW AND LESS WIND/WEAKER GRADIENTS FOR MON/TUE. NOT BUYING INTO THE STRONGER SW FLOW AND DRYING INDICATED ON AVN FOR TUE. IN THE SHORT TERM...SCATTERED STORMS FIRING UP THIS AFTERNOON AND QUESTION IS WHETHER OR NOT UPPER JET MAX ACROSS CA/NV WILL AGAIN PROVIDE DIVERGENCE TO CONTINUE STORMS THRU THE EVENING OR EVEN AID NOCTURNAL STORMS. GIVEN THE SLIGHTLY BETTER TRACK RECORD OF THE ETA LAST NIGHT...IT WAS FOLLOWED AND SUGGESTS THIS WILL AGAIN BE THE CASE. ETA SHOWS HIGH CAPE VALUES AND NEARBY UPPER DIVERGENCE ACROSS SRN NV OVERNIGHT AGAIN...WITH THE BEST UPPER SUPPORT OVER SOUTH CENTRAL NV ZONES. WORDED FORECASTS WITH MAINLY EVENING FOR STORMS ACROSS NV TO EXPRESS UNCERTAINTY IN TIMING. FOR MON/TUE...CANNOT NOT SEE MUCH CHANGE WITH MOISTURE REMAINING INTACT TO HELP FIRE AFT/EVE STORMS. IN FACT...HIGHER PRECIPITABLE WATER VALUES LURKING ALONG NRN MEXICO AND NRN GULF OF CA MAY YET MAKE ANOTHER SURGE INTO THE REGION TONIGHT OR MON NIGHT. DEFINITELY NO STRONG DRYING TREND INDICATED SO PERSISTENCE FORECAST SEEMS BEST FOR STORMS WITH LITTLE CHANGE IN TEMPS. IN THE EXTENDED...MRF AND ECMWF IN DECENT AGREEMENT KEEPING BROAD UPPER RIDGE ACROSS WRN STATES WED/THU...AMPLIFYING THE RIDGE OVER THE ROCKIES AGAIN FRI AS ANOTHER SHORT WAVE APPROACHES WEST COAST. WITH NO STRONG DRYING TREND INDICATED AND MOISTURE AGAIN POOLING OVER NRN MEXICO...FEEL STANDARD MID-AUGUST FORECAST CALLED FOR WITH SOME MENTION OF STORMS EACH DAY...ESPECIALLY ACROSS NV/AZ ZONES. NEMETH .LAS...NONE.
Nearby
Severe Thunderstorm Warnings in Nevada, 1999Every 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; the sounding from the Mesonet's radiosonde archive.