Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 53, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 6, 1998, 2:44 AM MST for Pima County, Arizona. It was in force for 61 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 6, 1998, 2:44 AM MST (09:44 UTC)
- Expired
- Aug 6, 1998, 3:45 AM MST
- In force
- 61 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 09:44 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, 9.7 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 7202 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
741 WUUS1 KTUS 060945 RRA SVRTUS AZC019-061045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 244 AM MST THU AUG 6 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN PIMA COUNTY IN SOUTHERN ARIZONA * UNTIL 345 AM MST * AT 243 AM MST... DOPPLER RADAR INDICATED AN AREA OF SEVERE THUNDERSTORMS MOVING OUT OF SOUTHWEST MARICOPA COUNTY AND INTO WESTERN PIMA COUNTY. THE STRONGEST STORM WAS ABOUT 15 MILES NORTHEAST OF AJO. STORM MOVEMENT WAS TO THE SOUTHWEST AT ABOUT 15 MPH. * THE SEVERE THUNDERSTORMS WILL BE NEAR... AJO BY 320 AM MST 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 6, 2:30 AM MST, 14 minutes earlier.
Area forecast discussion, Aug 6, 2:30 AM MST, 14 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 AM MST THU AUG 6 1998 SYNOPSIS...SUFFICIENT MOISTURE HAS MOVED BACK INTO SOUTHEAST ARIZONA TO COMBINE WITH DAYTIME HEATING AND PRODUCE SCATTERED THUNDERSTORMS WILL DEVELOP EACH AFTERNOON AND EVENING. DISCUSSION...AS STATED LAST NIGHT...ITS BACK. TRAINING LED TO EXTREMELY HEAVY RAINFALL IN SEVERAL AREAS LAST NIGHT WITH SEVERE ALSO A PROBLEM. NOT REALLY A CLASSIC SITUATION FOR THIS TIME OF YEAR...STRONG FLOW OUT OF THE NORTH AND NORTHEAST BRINGING IN PATCHY MOISTURE BETWEEN SYNOPTIC FEATURES (DEEPEST MOISTURE STILL REALLY TO OUR SOUTH AND SOUTHEAST)...BUT COMBINED WITH RECIRCULATED MOISTURE AROUND HERE WILL ALLOW FOR SOME STORMS. NORTHERN MEXICO NOT AS ORGANIZED...SO NO LOW LEVEL INFLUXES FROM THERE RIGHT NOW. SURGE SIGNATURES INDICATED THROUGH YUMA...BUT STRONG LOW LEVEL EASTERLY FLOW WONT ALLOW THAT DOWN OUT OF THE LOWER DESERTS FOR US THE NEXT 18 TO 24 HRS. AREAS OF COOLER AIR ALOFT AND WEAK IMPULSES ALSO EVIDENT IN NORTHERLY FLOW. PATCHY MOISTURE WITH STEEP LAPSE RATES AND GOOD SHEAR STILL MAKE OUR MAIN CONCERN SEVERE TODAY (ALTHOUGH ISOLATED AREAS OF TRAINING STORMS AGAIN NOT OUT OF THE QUESTION FOR FLOODING PROBLEMS). PATTERN IS COMPLEX. LOOKING AT 700MB...ETA KEEPS EVIDENCE OF THETA-E RIDGE OVER SOUTHEAST ARIZONA AND EVEN SPINS UP SOME FEATURES TO ALLOW MOISTURE TO CIRCULATE FROM THE LOWER DESERTS...BUT NOT DOING A GREAT JOB WITH THE OVERALL MOISTURE PICTURE (UNDERDOING NEW MEXICO). HIGH CENTER IN NO IMMEDIATE HURRY TO SHIFT INTO 4 CORNER REGION YET WITH TROUGH STALLED TEMPORARILY IN THE MIDWEST. WHENEVER I GO ON THIS LONG IT MEANS IM NOT SURE ABOUT ANYTHING. FORECAST FOR THE NEXT 24 HRS SIMILAR TO THE LAST...THAT IS STORM COVERAGE ISOLATED TO SCATTERED...BUT THE ONES WE DO GET WILL BE DOOZIES. UPSTREAM FLOW OUT OF NEW MEXICO NOT THAT WET AT THIS TIME...REAL LINK UP AGAIN WITH MEXICAN MONSOON MOISTURE BY THIS WEEKEND. TUS 343. MEYER .TWC...NONE.
In the hours before
Local storm report, Aug 5, 10:49 PM MST, 3 hours 55 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON ARIZONA
1049 PM MST WED AUG 05 1998
TIME(MST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0545 PM TUCSON AZ .75 INCH HAIL
08/05/98 PIMA NORTHEAST TUCSON
0550 PM TUCSON AZ .75 INCH HAIL
08/05/98 PIMA SANTA CATALINA FOOTHILLS
WIND GUST OVER 50 MPH
0553 PM TUCSON AZ .75 INCH HAIL
08/05/98 PIMA WINDS IN EXCESS OF 55 MPH
4 TO 5 POUND TILES BLOWN
OFF ROOFS
0555 PM TUCSON AZ 1.5 INCH HAIL
08/05/98 PIMA 1/4 MILE NORTH OF SWAN AND
SUNRISE
0558 PM TUCSON AZ 1 INCH HAIL
08/05/98 PIMA ACE HARDWARE ON SWAN
0708 PM VAIL AZ 70 MPH TSTM GUST
08/05/98 PIMA 15 N OF SONOITA ON HIGHWAY
83 IN SOUTHEAST PIMA
COUNTYLocal storm report, Aug 5, 10:49 PM MST, 3 hours 55 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON ARIZONA
1049 PM MST WED AUG 05 1998
TIME(MST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0545 PM TUCSON AZ .75 INCH HAIL
08/05/98 PIMA NORTHEAST TUCSON
0550 PM TUCSON AZ .75 INCH HAIL
08/05/98 PIMA SANTA CATALINA FOOTHILLS
WIND GUST OVER 50 MPH
0553 PM TUCSON AZ .75 INCH HAIL
08/05/98 PIMA WINDS IN EXCESS OF 55 MPH
4 TO 5 POUND TILES BLOWN
OFF ROOFS
0555 PM TUCSON AZ 1.5 INCH HAIL
08/05/98 PIMA 1/4 MILE NORTH OF SWAN AND
SUNRISE
0558 PM TUCSON AZ 1 INCH HAIL
08/05/98 PIMA ACE HARDWARE ON SWAN
0708 PM VAIL AZ 70 MPH TSTM GUST
08/05/98 PIMA 15 N OF SONOITA ON HIGHWAY
83 IN SOUTHEAST PIMA
COUNTYThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 5:24 PM MST | Flash Flood Warning | TWC | Pima | 2 hr |
| Aug 5, 5:43 PM MST | Severe Thunderstorm Warning | TWC | Pima | 62 min |
| Aug 5, 6:38 PM MST | Flash Flood Warning | TWC | Pima | 52 min |
| Aug 5, 6:38 PM MST | Severe Thunderstorm Warning | TWC | Pima | 52 min |
| Aug 5, 7:20 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 75 min |
| Aug 5, 8:54 PM MST | Flash Flood Warning | TWC | Pima | 96 min |
| Aug 5, 11:56 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 49 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.