Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 96, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Sep 1, 1997, 3:37 PM MST for Pima County, Arizona. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 1, 1997, 3:37 PM MST (22:37 UTC)
- Expired
- Sep 1, 1997, 5:40 PM MST
- In force
- 2 hr
- 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 22:40 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, 10.6 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
- 91 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 1989 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 20 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 012238 RRA SVRTUS AZC019-020040- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 337 PM MST MON SEP 1 1997 THE NATIONAL WEATHER SERVICE IN TUCSON AZ HAS EXTENDED THE SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 540 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHERN ARIZONA ...CENTRAL AND EAST CENTRAL PIMA COUNTY AT 330 PM MST TUCSON DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS EXTENDING FROM 8 MILES NORTHWEST OF THREE POINT TO 10 MILES SOUTH OF THREE POINTS MOVING TOWARDS THE NORTHWEST AT 20 MPH. THESE STORMS ARE CAPABLE OF PRODUCING WIND GUSTS TO 60 MPH AND BRIEF HEAVY RAIN. THE SEVERE THUNDERSTORMS THAT WERE IN THE RYAN FIELD AREA EARLIER HAVE MOVED OUT OF THAT AREA. COLLINS
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 Sep 1, 2:30 PM MST, 1 hour 7 minutes earlier.
Area forecast discussion, Sep 1, 2:30 PM MST, 1 hour 7 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST MON SEP 1 1997 DRIER AIR MOVG INTO SE AZ AT MID LVLS FM THE E THIS AFTN. DEW PTS IN THE MID TO UPR 40S DEGREES F IN SW NM. TS SCT TO ISOLD...BUT SOME ARE SUPRISINGLY INTENSE. DRY MID LVL AIR TO MAKE FOR A FAIRLY QUIET TUE FOR MOST OF SE AZ. DP MSTR STILL ACRS WRN AZ. H5 HI TO LIFT INTO ERN CO AND BACK THE FLOW ALF TO A E TO SE DIRECTION NEXT TWO DAYS WHICH SHOULD LIMIT THE SEEMINGLY NON STOP FLOW OF TROP MSTR INTO THE CWA. DRY AIR IS ERODED BY THE SURROUNDING H7 MSTR WED FOR A RETURN TO A MORE TYPICAL MONSOONAL PATTERN. MED RNG MODELS DIVERGE ON THE STRENGTH OF A GULF OF AK TROF POISED TO MOV INTO THE WRN U.S. BY NEXT WEEKEND. MRF FCSTS PERSISTANCE FOR SE AZ WHILE THE EURO MODELS...SPCLLY THE UKMET WANT TO MAKE THIS FEATURE THE THE POTENTIAL MONSOON ENDER. AGREE WITH PHX THAT MRF LOOKS LIKE THE BETTER MODEL SINCE THE TREND HAS BEEN THIS SUMMER FOR THESE SYSTEMS TO SHEAR THEMSELVES APART WHEN THEY HIT THE MEAN RDG POSTN. TUS 3232. OKULSKI TUS...NONE
In the hours before
Special weather statement, Sep 1, 11:43 AM MST, 3 hours 54 minutes before
AZZ019-026>030-012300-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1145 AM MST MON SEP 1 1997...THIS PRODUCT IS NOT UPDATED
AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 25 10 25 10 NW 12
GRAHAM 25 10 25 10 NW 12
GREENLEE 30 10 25 10 NW 12
TUCSON/ERN PIMA 30 20 40 20 NW 15
TOHONO OODHAM 35 20 45 25 NW 15
WESTERN PIMA 40 20 45 25 NW 15
SOUTHEAST PINAL 30 20 40 20 NW 15
SANTA CRUZ 40 25 45 25 NW 15
SYNOPSIS...MOISTURE CONTINUES TO STREAM UP FROM MEXICO INTO
SOUTHWESTERN ARIZONA. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS WILL CONTINUE INTO THE AFTERNOON AND EVENING HOURS
ACROSS WESTERN PIMA COUNTY. SKIES HAVE CLEARED IN SOUTHEAST
ARIZONA AT MIDDAY. DRIER AIR HAS MOVED INTO EASTERN COCHISE AND
GRAHAM COUNTIES FOR LESS THUNDERSTORM ACTIVITY. SANTA CRUZ AND
CENTRAL PIMA COUNTIES WILL SEE THE BEST CHANCE FOR STRONG
THUNDERSTORMS THIS AFTERNOON AND EVENING WITH HEAVY RAIN AND
STRONG GUSTY WINDS.
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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 NOON 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.
END/OKULSKIThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 2:04 PM MST | Severe Thunderstorm Warning | TWC | Pima | 46 min |
| Sep 1, 2:44 PM MST | Severe Thunderstorm Warning | TWC | Pima | 46 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1997Every severe thunderstorm warning in 1997
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.