Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 31, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 19, 1998, 7:58 PM MST for Pima County, Arizona. It was in force for 32 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
- Jul 19, 1998, 7:58 PM MST (02:58 UTC)
- Expired
- Jul 19, 1998, 8:30 PM MST
- In force
- 32 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 02:58 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 00:00Z, 3.0 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
- 262 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 2738 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- -23 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 200259 SVRTUS AZC019-200330- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 758 PM MST SUN JUL 19 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL PIMA COUNTY IN SOUTHERN ARIZONA * UNTIL 830 PM MST * AT 755 PM MST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH EXTREMELY HEAVY RAINFALL BETWEEN SANTA ROSA AND COVERED WELLS ALONG INDIAN NATION ROAD 15. THIS STORM IS MOVING SOUTHWEST AT 10 MPH. JRG
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 Jul 19, 2:30 PM MST, 5 hours 28 minutes earlier.
Area forecast discussion, Jul 19, 2:30 PM MST, 5 hours 28 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST SUN JUL 19 1998 SYNOPSIS...SURGE OF MOISTURE FROM THE GULF OF CALIFORNIA COMBINED WITH AN UPPER LEVEL IMPULSE WILL LEAD TO INCREASED THUNDERSTORM ACTIVITY ACROSS SOUTHEAST ARIZONA. DISCUSSION...HIGH REMAINS CENTERED NEAR THE UT/AZ BORDER...SHIFTING SLOWLY EASTWARD OVER THE NEXT 48 HRS. UPPER LEVEL IMPULSE SPINNING UNDER IT IN EASTERLY INTO SOUTHEAST AZ WILL CONTINUE TO SHIFT SLOWLY WESTWARD. STRONG SURGE SIGNAL EVIDENT IN YUMA OVERNIGHT SPREADING INTO THE LOWER DESERTS CIRCULATING INTO THE WESTERN 2/3RDS OF OUR AREA. LOTS OF SUNSHINE...VERY UNSTABLE OUTSIDE OF SUBSIDENCE IMMEDIATELY AHEAD OF IMPULSE. EVERYTHING POINTS TOWARDS A SIGNIFICANT THUNDERSTORM AFTERNOON AND EVENING WITH CONSIDERATION FOR SEVERE AS WELL AS LOCALLY HEAVY RAINFALL. UPPER LEVEL DYNAMICS MAY ASSIST STORM DEVELOPMENT / REDEVELOPMENT OVERNIGHT. IF OVERNIGHT ACTIVITY TURNS OUT TO BE AS HEAVY AS PREDICTED...DEBRIS CLOUD AND SOME STABILITY IN THE LOWER ATMOSPHERE COULD HELP DEPRESS WIDESPREAD ACTIVITY TOMORROW. WILL TAYLOR THE FORECAST IN THAT DIRECTION...BUT NOT COMPLETELY. OTHERWISE OVERALL GOOD THUNDERSTORM CONDITIONS WILzL PERSIST INTO THE EXTENDED. TUS 6333. MEYER .TWC...NONE.
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 6:45 PM MST | Flash Flood Warning | TWC | Pima | 2 hr |
| Jul 19, 6:52 PM MST | Flash Flood Warning | TWC | Pima | 68 min |
| Jul 19, 6:52 PM MST | Severe Thunderstorm Warning | TWC | Pima | 68 min |
| Jul 20, 12:36 PM MST | Severe Thunderstorm 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.