Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 49, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 8, 1998, 6:29 PM MST for Maricopa 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 8, 1998, 6:29 PM MST (01:29 UTC)
- Expired
- Aug 8, 1998, 7:30 PM MST
- In force
- 61 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Maricopa County, AZ
The nearest sounding before it
Phoenix, AZ (KPHX), launched 00:00Z, 1.5 hours before the alert went out and 49 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
- 362 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 3461 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
366 WUUS1 KPHX 090130 RRA SVRPHX AZC013-090230- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 629 PM MST SAT AUG 8 1998 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MARICOPA COUNTY IN CENTRAL ARIZONA * UNTIL 730 PM MST * AT 625 PM MST DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES SOUTHWEST OF GILA BEND. MOVEMENT WAS TO THE NORTHWEST AT 10 MPH. * SOME LOCATIONS AFFECTED INCLUDE GILA BEND...ALONG I-8...AND STATE ROUTE 85. STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.
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.
In the hours before
Special weather statement, Aug 8, 3:10 PM MST, 3 hours 19 minutes before
AZZ020>028-CAZ030>033-090240- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE PHOENIX AZ 310 PM MST (310 PM PDT) SAT AUG 8 1998 ...DEEP MOISTURE FROM TROPICAL STORM FRANK MAY LEAD TO HEAVY RAINFALL ON SUNDAY AND MONDAY... A TROPICAL STORM OFF THE COAST OF BAJA CALIFORNIA...MEXICO IS EXPECTED TO SEND A SIGNIFICANT AMOUNT OF MOISTURE NORTHWARD INTO SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA ON SUNDAY AND MONDAY...RESULTING IN HEAVY RAIN AND POSSIBLE FLOODING. TROPICAL STORM FRANK WAS PRESENTLY LOCATED OFF THE LOWER BAJA COAST AND WAS MOVING NORTHWARD. THIS STORM IS EXPECTED TO TRACK UP THE BAJA COAST TO NEAR PUNTA EUGENIA BY MIDDAY SUNDAY...AND THEN WEAKEN AND CURVE NORTHWESTWARD OUT TO SEA. THE TROPICAL STORM ITSELF IS NOT EXPECTED TO THREATEN SOUTHEAST CALIFORNIA OR SOUTHWEST ARIZONA... HOWEVER DEEP TROPICAL MOISTURE ASSOCIATED WITH THE STORM IS EXCPECTED TO MOVE INTO THE AREA ON SUNDAY AND MONDAY. SOME MOISTURE INCREASE IS ALREADY OCCURRING ACROSS SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA...IN ADVANCE OF THIS SYSTEM. THIS IS EXPECTED TO RESULT IN SCATTERED THUNDERSTORMS TONIGHT...FOLLOWED BY A SIGNIFICANT INCREASE IN PRECIPITATION ON SUNDAY AND MONDAY AS THE DEEPER TROPICAL MOISTURE MOVES IN. HEAVY RAIN IS EXPECTED TO DEVELOP ON SUNDAY IN AN AREA EXTENDING FROM NEAR PHOENIX...WESTWARD TO THE SAN DIEGO COUNTY MOUNTAINS IN SOUTHERN CALIFORNIA. THE AREAS EXPECTED TO BE SUBJECT TO THE GREATEST RISK OF HEAVY RAIN AND FLOODING INCLUDE THE LOWER COLORADO RIVER VALLEY AND THE IMPERIAL VALLEY IN CALIFORNIA. HOWEVER...AREAS AS FAR EAST AS PHOENIX COULD EXPERIENCE SIGNIFICANT RAINFALL AND POSSIBLE FLOODING. AGAIN...TROPICAL STORM FRANK IS NOT EXPECTED TO AFFECT SOUTHEAST CALIFORNIA OR SOUTHWEST ARIZONA DIRECTLY. HOWEVER...DEEP TROPICAL MOISTURE ASSOCIATED WITH THIS STORM SYSTEM IS EXPECTED TO MAKE ITS WAY INTO THE AREA...RESULTING IN HEAVY RAIN AND POSSIBLE FLOODING. STAY TUNED FOR FURTH ER UPDATES FROM THE NATIONAL WEATHER SERVICE REGARDING THIS DEVELOPING WEATHER SITUATION. FLASH FLOOD WATCHES MAY BE REQUIRED AT A LATER TIME AS THE DEEPER MOISTURE MAKES ITS WAY INTO THE REGION. KOCH
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.