Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 69, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 14, 1998, 4:00 PM MST for Pima County, Pinal County, Arizona. It was in force for 45 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 14, 1998, 4:00 PM MST (23:00 UTC)
- Expired
- Aug 14, 1998, 4:45 PM MST
- In force
- 45 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
Counties Pima County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 88 km from the middle of the area, began a volume at 23:00 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, 11.0 hours before the alert went out and 73 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1645 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
279 WUUS1 KTUS 142259 RRA SVRTUS AZC019-021-142345- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 400 PM MST FRI AUG 14 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN PIMA COUNTY IN SOUTHERN ARIZONA SOUTHEASTERN PINAL COUNTY IN SOUTH CENTRAL ARIZONA * UNTIL 445 PM MST * AT 400 PM MST... DOPPLER RADAR INDICATED AN AREA OF SEVERE THUNDERSTORMS IN FAR SOUTHEAST PINAL COUNTY NEAR ORACLE JUNCTION AND SAN MANUEL AND IN FAR NORTHEAST PIMA COUNTY IN THE CATALINA MOUNTAINS. MOVEMENT IS TO THE SOUTHWEST AT ABOUT 10 MPH. MEYER
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 14, 2:30 PM MST, 1 hour 30 minutes earlier.
Area forecast discussion, Aug 14, 2:30 PM MST, 1 hour 30 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST FRI AUG 14 1998 SYNOPSIS...HIGH PRESSURE OVER THE GREAT BASIN WILL MAINTAIN AN EASTERLY TO SOUTHEAST WIND FLOW OVER SOUTHEAST ARIZONA. THIS WILL ALLOW MONSOONAL MOISTURE AND THUNDERSTORMS TO PERSIST OVER SOUTHEAST ARIZONA INTO THE WEEKEND. DISCUSSION...THUNDERSTORMS STARTED ON THE WHITE MOUNTAINS RATHER EARLY TODAY BUT HAVE BEEN SLOW TO BUILD. EASTERLY MID LEVELS WINDS OF 15-25 KTS. SATELLITE ALREADY SHOWING STORMS MOVING FROM THE WHITE MOUNTAINS INTO GRAHAM COUNTY. FOR SATURDAY AND SUNDAY HIGH CENTER MOVES TO EAST CENTRAL ARIZONA AND NEW MEXICO. THIS TURNS MID LEVEL WINDS OUT OF THE EAST TO SOUTHEAST. THIS IS STILL A MOIST FLOW SO SEE LITTLE CHANGE IN THUNDERSTORM PROBABILITIES...THOUGH MAYBE LESS ACTIVITY FAR WEST. LESS LIKELY THAT STORMS WILL PROPAGATE OFF THE RIM...AND STORMS MORE LIKELY TO END BEFORE MIDNIGHT. TUS 333. .TWC...NONE.
In the hours before
Special weather statement, Aug 14, 12:05 PM MST, 3 hours 55 minutes before
AZZ019-029>035-150800-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST FRI AUG 14 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 30 20 40 30 SW 15
GRAHAM 50 30 60 40 SW 15
GREENLEE 50 30 60 40 SW 15
TUCSON/ERN PIMA 30 20 50 10 SW 15
TOHONO OODHAM 20 20 30 10 SW 15
WESTERN PIMA 20 20 30 10 SW 15
SOUTHEAST PINAL 30 20 40 20 SW 15
SANTA CRUZ 30 20 40 20 SW 15
SYNOPSIS...THE ATMOSPHERE ACROSS SOUTHEAST ARIZONA IS AGAIN MOIST
AND UNSTABLE. EASTERLY WINDS WILL LIKELY PUSH THUNDERSTORMS OFF THE
MOGOLLON RIM INTO VALLEY LOCATIONS...THIS MAY ALLOW THUNDERSTORMS TO
CONTINUE INTO THE LATE NIGHT. SEVERE WIND GUSTS ARE POSSIBLE. THOUGH
FLASH FLOODING IS POSSIBLE...IT IS LESS LIKELY THAN YESTERDAY.
*****************************************************************
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/The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 6:14 PM MST | Severe Thunderstorm Warning | TWC | Pima | 36 min |
| Aug 13, 9:01 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 49 min |
| Aug 14, 12:15 AM MST | Flash Flood Warning | TWC | Pima | 2 hr |
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.