Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 7, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 4, 1998, 6:02 PM MST for Pima County, Arizona. It was in force for 48 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 4, 1998, 6:02 PM MST (01:02 UTC)
- Expired
- Jul 4, 1998, 6:50 PM MST
- In force
- 48 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 01:06 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, 1.0 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
- 428 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 2020 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
162 WUUS1 KTUS 050104 RRA SVRTUS AZC019-050150- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 602 PM MST SAT JUL 4 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN PIMA COUNTY IN SOUTHERN ARIZONA * UNTIL 650 PM MST * AT 559 PM MST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 19 MILES SOUTHWEST OF SELLS OR 17 MILES WEST NORTHWEST OF SAN MIGUEL MOVING NORTH AT 10 MPH. VPH
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 4, 2:30 PM MST, 3 hours 32 minutes earlier.
Area forecast discussion, Jul 4, 2:30 PM MST, 3 hours 32 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST SAT JUL 4 1998 SYNOPSIS...AN UPPER LEVEL RIDGE OF HIGH PRESSURE WILL BUILD OVER SOUTHERN AND CENTRAL ARIZONA. FLOW ALOFT WILL BECOME MORE SOUTHEASTERLY. THIS WILL REGENERATE AFTERNOON AND EVENING THUNDERSTORM ACTIVITY THROUGH MONDAY. DISCUSSION...AREAS THAT HAD SIGNIFICANT CLOUD COVER THIS MORNING SHOWING LITTLE THUNDRESTORM ACTIVITY SO FAR. WILL DROP THESE AREAS FROM SCATTERED TO ISOLATED FOR THIS EVENING. MODEL MOISTURE FIELDS ARE OF LITTLE USE. AT 500 MB THE RIDGE BEGINS BUILDING OVER SOUTHEAST ARIZONA ON SUNDAY...AND BY MONDAY THE AVN HAS IT NORTH OF TUCSON. THE 6-10 AVERAGE HAS THE HIGH CENTER NEAR THE FOUR CORNERS AREA. NO STRONG SURFACE WINDS TO BLOW OUT THE MOISTURE. SO ISOLATED THUNDERSTORMS WEST AND SCATTERED EAST. AFTERNOON TEMPERATURES WILL DEPEND ON CLOUD COVER. SO GOING WITH STANDARD MONSOON FORECAST THROUGH 5 DAYS. TUS 3222. 4.TWC...NONE.
In the hours before
Special weather statement, Jul 4, 12:13 PM MST, 5 hours 49 minutes before
AZZ019-026>030-050700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST SAT JUL 04 1998...THIS PRODUCT IS NOT UPDATED
AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 20 30 40 20 N 15
GRAHAM 40 30 40 20 N 15
GREENLEE 50 50 60 20 N 15
TUCSON/ERN PIMA 50 50 60 30 N 15
TOHONO OODHAM 40 50 50 20 N 15
WESTERN PIMA 30 30 20 10 N 15
SOUTHEAST PINAL 30 50 50 20 N 15
SANTA CRUZ 60 50 60 30 N 15
SYNOPSIS...
THE ATMOSPHERE IS QUITE MOIST AND UNSTABLE...ALLOWING THUNDERSTORMS
TO DEVELOP EARLIER IN THE DAY. THEY WILL DEVELOP OVER THE MOUNTAINS
FIRST THEN MOVE INTO VALLEY LOCATIONS. STRONG WINDS AND LOCAL FLASH
FLOODING IS POSSIBLE.
*****************************************************************
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 |
|---|---|---|---|---|
| Jul 4, 6:31 PM MST | Flash Flood Warning | TWC | Pima | 119 min |
| Jul 5, 7:46 AM MST | Flash Flood Warning | TWC | Cochise | 119 min |
| Jul 5, 7:57 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.