Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 28, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 6, 2001, 5:12 PM MST for Coconino County, Arizona. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jul 6, 2001, 5:12 PM MST (00:12 UTC)
- Expired
- Jul 6, 2001, 5:45 PM MST
- In force
- 33 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Coconino County, AZ
The radar
The Cedar City radar (KICX), 149 km from the middle of the area, began a volume at 00:14 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
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 0.2 hours before the alert went out and 197 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
- 128 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 604 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KFGZ 070014 SVRFLG AZC005-070045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 512 PM MST FRI JUL 6 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME NORTH CENTRAL COCONINO COUNTY IN ARIZONA * UNTIL 545 PM MST * AT 512 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF WAHWEEP...OR ABOUT 4 MILES NORTHEAST OF PAGE...MOVING NORTHEAST AT 20 MPH. THIS STORM WILL MOVE ACROSS THE WESTERN PORTIONS OF LAKE POWELL. THIS STORM WILL PRODUCE WIND GUSTS OF 60 MPH AS IT MOVES ACROSS THE LAKE. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3699 11153 3687 11137 3699 11112 3699 11133 JDL
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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 6, 2:30 PM MST, 2 hours 42 minutes earlier.
Area forecast discussion, Jul 6, 2:30 PM MST, 2 hours 42 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST FRI JUL 06 2001 SYNOPSIS...SOUTHERLY FLOW WILL CONTINUE TO BRING MOISTURE NORTHWARD ACROSS NORTHERN ARIZONA. AS A RESULT...EXPECT DAILY SHOWERS AND THUNDERSTORMS OVER MUCH OF THE AREA INTO NEXT WEEK. DISCUSSION...WEAK UPPER TROUGH NEAR BAJA CALIFORNIA CONTINUES TO APPROACH NORTHERN ARIZONA WITH AN UPPER RIDGE CENTERED OVER THE OKLAHOMA PANHANDLE. THE PRESSURE GRADIENT BETWEEN THESE SYSTEMS WILL RESULT IN A MID-LEVEL SOUTHERLY FLOW FOR AT LEAST THE NEXT COUPLE OF DAYS WITH A MOIST LOW TO MID LEVEL AIR MASS ADVECTING NORTHWARD INTO NORTHERN ARIZONA. ON SATURDAY...THE AVN IS PROMISING SOME STABILIZATION AS THE MID LEVELS DRY A LITTLE AND A MOIST BUT COOL BOUNDARY LAYER REMAINS BEHIND THE TROUGH. HOWEVER...WILL GO WITH A GENERAL CHANCE POPS GIVEN THE RATHER HIGH AMOUNTS OF BOUNDARY LAYER MOISTURE ACROSS THE SOUTHWEST UNITED STATES (ONLY EXCEPTION WILL BE SLIGHT CHANCE POPS FOR LOCATIONS SOUTH OF THE MOGOLLON RIM). THIS MOISTURE SHOULD BE TOUGH TO SCOUR OUT. ON SUNDAY THE MOIST SOUTHERLY FLOW WILL CONTINUE. WILL NOT INDICATE A DIURNAL TENDENCY IN CONVECTION SINCE WITH MOIST SOUTHERLY FLOW THUNDERSTORMS CAN DEVELOP ALMOST ANY TIME OF DAY. PRECIPITABLE WATER VALUES WILL REMAIN FAIRLY HIGH SO EXPECT A THREAT OF LOCALIZED FLASH FLOODING THE NEXT TWO DAYS. SLIGHTLY LOWER DAYTIME HIGHS ON SATURDAY AS THE COOL TROUGH CORE MOVES OVER ARIZONA AND THEN SOME WARMING ON SUNDAY AS THE UPPER RIDGE REBUILDS. WINDS WILL GENERALLY REMAIN LIGHT AND VARIABLE EXCEPT IS ASSOCIATION WITH THUNDERSTORMS. IN THE EXTENDED...SUBTROPICAL RIDGE REMAINS NEARLY STATIONARY OVER REMAINING CENTERED NEAR COLORADO INTO NEXT WEEK. THIS WILL RESULT IN THE CONTINUATION OF MOIST SOUTHERLY FLOW AND THE CHANCE OF SHOWERS AND THUNDERSTORMS EACH DAY. MCCOLLUM .FGZ...NONE.
Nearby
Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001
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.