Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 44, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 29, 2001, 4:09 PM MST for Apache County, Arizona. It was in force for 36 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 29, 2001, 4:09 PM MST (23:09 UTC)
- Expired
- Jul 29, 2001, 4:45 PM MST
- In force
- 36 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Apache County, AZ
The radar
The Flagstaff radar (KFSX), 181 km from the middle of the area, began a volume at 23:10 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 12:00Z, 11.2 hours before the alert went out and 210 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
- 1 J/kg
- Mixed-layer CIN
- -291 J/kg
- Mixed-layer LCL
- 2003 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -55 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 29, 2:30 PM MST, 1 hour 39 minutes earlier.
Area forecast discussion, Jul 29, 2:30 PM MST, 1 hour 39 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST SUN JUL 29 2001 .SYNOPSIS...UPPER LEVEL HIGH PRESSURE TO THE EAST AND AN UPPER LEVEL TROUGH TO THE NORTHWEST WILL ALLOW FOR MONSOONAL MOISTURE TO MOVE NORTHWARD INTO ARIZONA TONIGHT AND MONDAY. THERE WILL BE A CHANCE OF THUNDERSTORMS OVER THE EASTERN MOGOLLON RIM AND WHITE MOUNTAINS TONIGHT...WITH A CHANCE OF THUNDERSTORMS OVER ALL OF NORTHERN ARIZONA ON MONDAY. DRIER AIR MAY WORK INTO THE NORTHWEST PART OF THE STATE TUESDAY WITH DECREASING CHANCES OF THUNDERSTORMS THERE AND A GOOD CHANCE FOR THUNDERSTORMS FROM FLAGSTAFF AND TO THE EAST. IT LOOKS AS THOUGH THE MONSOONAL MOISTURE WILL REMAIN OVER NORTHERN ARIZONA INTO THE UP AND COMING WEEKEND. .DISCUSSION...TONIGHT THE MAIN WEATHER CHALLENGES WILL BE EXTENT OF CONVECTION AS DEEP MOISTURE IS PUSHED UPSLOPE INTO THE MOGOLLON RIM AND THE WHITE MOUNTAINS. CLOUD COVER TO THE SOUTH MAY INHIBIT THE EXTENT OF THE CONVECTION TO THE SOUTHEAST...SO WILL MONITOR EVOLUTION OF CONVECTION THIS AFTERNOON. WILL SET POPS IN THE EASTERN RIM AND THE WHITE MOUNTAINS ACCORDINGLY THIS AFTERNOON IN ASSOCIATION WITH THE EXTENT OF THE CONVECTION DOWN THERE. AN UPPER LEVEL WAVE TO THE SOUTH OF ARIZONA PUSHES NORTHWARD AS WELL ON MONDAY AND BECOMES CAUGHT IN THE WESTERLIES. THIS WAVE MOVES INTO CENTRAL ARIZONA DURING THE DAY AND LIFTS INTO THE NORTHEAST PLATEAUS MONDAY NIGHT. DEEP MOISTURE MOVES NORTHWARD WITH THIS FEATURE...INCREASING CHANCES OF THUNDERSTORMS. SOUTH FLOW AND DEEP MOISTURE MONDAY AFTERNOON INTO MONDAY NIGHT MAY ENHANCE THE HEAVY RAIN POTENTIAL AS CONVECTION DEVELOPS AND MOVES NORTHWARD OVER THE RIM AND THE WHITE MOUNTAINS. BEST POTENTIAL FOR TSRA FROM THE NORTHEAST PLATEAU INTO THE SHERIDAN MOUNTAINS MONDAY NIGHT AND FROM FLAGSTAFF AND TO THE EAST ON TUESDAY. EXTENDED...FAIRLY STRONG EASTERLY WAVE PUSHES INTO SOUTHEAST SECTIONS OF THE FORECAST AREA LATE WEDNESDAY INTO THURSDAY MORNING...WITH BEST CHANCES FOR SIGNIFICANT RAIN...WORTH WATCHING FOR NOW. HIGH PRESSURE WILL CONTINUE TO REMAIN CENTERED TO THE EAST OF ARIZONA WITH MONSOONAL FLOW AND WEAK EAST ERLY WAVES TO PERPETUATE TSRA THRU THE EXTENDED. CLEMMONS .FGZ...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 3:27 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 33 min |
| Jul 29, 4:09 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 36 min |
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.