Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 45, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 1, 1998, 3:53 PM MST for Pima County, Arizona. It was in force for 47 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 1, 1998, 3:53 PM MST (22:53 UTC)
- Expired
- Aug 1, 1998, 4:40 PM MST
- In force
- 47 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
County Pima County, AZ
The radar
The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 22:54 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.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 10.9 hours before the alert went out and 84 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
- 197 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 1780 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUS 012254 SVRTUS AZC019-012340- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 353 PM MST SAT AUG 1 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN PIMA COUNTY IN SOUTHERN ARIZONA * UNTIL 440 PM MST * AT 350 PM MST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER SOUTHEAST TUCSON MOVING NORTH AT 10 MPH AND WILL MOVE THROUGH THE EASTERN PART OF THE TUCSON METRO AREA THROUGH 440 PM. THIS STORM WAS ALSO PRODUCING VERY HEAVY RAINFALL AND IS CAPABLE OF PRODUCING WIND GUSTS OVER 58 MPH. CEC
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 Tucson, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 1, 2:30 PM MST, 1 hour 23 minutes earlier.
Area forecast discussion, Aug 1, 2:30 PM MST, 1 hour 23 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST SAT AUG 1 1998 SYNOPSIS...MOIST AIR REMAINS OVER THE STATE AND THUNDERSTORMS WILL DEVELOP DURING THE AFTERNOON AND EVENING. DISCUSSION...REALLY ACTIVE DAY SO FAR BUT TSTMS STILL HAVNT MOVD FAR AWAY FROM MTNS...BUT TEMPS SEEM TO BE MOVG UP NICELY SO THINK THEY WILL MOVE INTO VALLEYS THIS AFTN. ONE THING THAT MIGHT HELP IS THAT ETA FCST H2 UPR LOW DEVELOPING SOUTH OF SAN PUTTING SRN AZ IN FAVORABLE SECTION OF LOW. WOULD NORMALLY FCST DOWN DAY FOR SUN AFTER BIG DAY TODAY BUT THINK THAT POTENTIAL FOR SWD MOVG RIM STORMS EXISTS SINCE MID LVL WNDS WILL BECOME NRLY. DONT SEE MUCH CHANGE IN MSTR INTO NEXT WEEK AND EXCEPT FOR DAY TO DAY VARIABILITY NOT MUCH TO CHANGE. TUS 7232. HOLBROOK .TWC...FLASH FLOOD WATCH ZONES 029-032>035 UNTIL 700 PM MST.
In the hours before
Special weather statement, Aug 1, 12:45 PM MST, 3 hours 8 minutes before
AZZ019-029>035-020700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST SAT AUG 1 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 70 15 70 40 N 10
GRAHAM 70 15 70 40 N 10
GREENLEE 60 10 60 30 N 10
TUCSON/ERN PIMA 70 20 70 50 N 10
TOHONO O'ODHAM 60 20 70 50 N 10
WESTERN PIMA 50 15 40 20 N 10
SOUTHEAST PINAL 60 20 70 40 N 10
SANTA CRUZ 70 20 70 60 N 10
SYNOPSIS...PLENTY OF MOISTURE IN PLACE AND STORMS DEVELOPING SOUTH
OF NOGALES SHOULD EXPAND NORTHWARD. SOME THREAT OF SEVERE WINDS WITH
STORMS.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
REACH SEVERE LEVELS (DAMAGING WIND AND/OR
LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
ANY LOCATION
STORM MOTION - GENERAL DIRECTION TO WHICH THE STORMS WILL
LIKELY MOVE AND SPEED IN MPH
NOTE...
VALID TIME IS FROM 12:45 PM TO 12 MIDNIGHT OF THE DAY OF ISSUANCE.
THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES. CORRESPONDING GRAPHICS MAY BE FOUND ON THE NWS
TUCSON INTERNET PAGE AT
HTTP://NIMBO.WRH.NOAA.GOV/TUCSON/SWO/SWO.SHTML
END/VPHThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 5:18 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 47 min |
| Jul 31, 5:47 PM MST | Flash Flood Warning | TWC | Cochise | 78 min |
| Aug 1, 1:18 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 52 min |
| Aug 1, 4:21 PM MST | Flash Flood Warning | TWC | Pima | 64 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1998Every severe thunderstorm warning 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.