Hail, Fergus
- When
- July 21, 6:55 PM MST
- Where
- Fergus County, Lewistown
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 47.067, -109.417
Actual spotter location Lewistown 15 SE.
Hail in Montana, July 21, 2001
1 hail, as filed by the National Weather Service.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
What forecasters said that day
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Great Falls, MT wrote its last area forecast discussion before the first event at Jul 21, 2:00 PM MST, 4 hours 55 minutes earlier.
Area forecast discussion, Jul 21, 2:00 PM MST, 4 hours 55 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT SAT JUL 21 2001 ACCORDING TO MODELS LOOKS LIKE THERE WILL BE A CHANGE TO CURRENT PATTERN OF SW FLOW ALOFT WITH SEVERE WEATHER EPISODES E OF THE CONTINENTAL DIVIDE. FOR TONIGHT...AIRMASS IS UNSTABLE ONCE AGAIN OVER AREA AND EVEN A LITTLE MORE UNSTABLE THAN EARLY FRI AFTERNOON. MSAS DATA INDICATES A MOISTURE CONVERGENCE AREA FROM SW TO N CENTRAL MT AT 19Z. APPEARS TO BE ENOUGH SHEAR FOR ORGANIZED STORMS BUT NOT NECESSARILY SUPERCELLS. THE PROBLEM LIKE FRIDAY NIGHT IS THAT MODELS DO NOT INDICATE ANY SIGNIFICANT SHORTWAVES AFFECTING FORECAST AREA. STILL WITH QUITE AN UNSTABLE AIRMASS WILL GO WITH HIGH SCATTERED TO LOW LIKELY POPS OVER MOST OF AREA. IN THE FAR NW WILL GO WITH SLIGHT CHANCE POPS AS THAT AREA IS FORECAST TO BE IN A DRIER AIRMASS. FOR SUNDAY...ETA AND AVN DIFFER SIGNIFICANTLY WITH REMNANTS OF PAC NW UPPER TROUGH MOVING THROUGH THE AREA. PREFER THE SLOWER AND WEAKER ETA AS THE AVN/MRF HAS HAD A TENDENCY TO BE TOO STRONG AND FAST WITH SHORTWAVES MOVING TOWARDS AN UPPER RIDGE. WILL GO WITH 20 AND 30 PCT POPS AS MOISTURE AND LIFT AHEAD OF FEATURE ARE NOT VERY IMPRESSIVE. FORECAST SOUNDINGS STILL INDICATE SOME INSTABILITY DURING THE AFTERNOON BUT IT IS QUITE A BIT LESS THAN THAT OF TODAY. FOR MONDAY...BOTH ETA AND AVN FORECAST A STRONGLY POSITIVELY TILTED SHORTWAVE FROM SW SASK THROUGH NW MT TO ERN OREGON. AREA IS MAINLY UNDER WLY CONFLUENT FLOW ALOFT WITH LITTLE IN THE WAY OF SHORTWAVE ACTIVITY. AIRMASS IS ALSO NOT ALL THAT MOIST. WAS TEMPTED TO GO DRY BUT MODELS DO INDICATE SOME WEAK INSTABILITY SO WILL GO WITH BROADBRUSH 20 PCT POPS. AVN QPF FOR MON LOOKS OVERDONE. BLANK .EXTENDED... ON TUESDAY THE TROUGH CONTINUES OVER THE WESTERN US WITH MINOR SHORT WAVES MOVING THROUGH THE MEAN SW FLOW. THE TROUGH LOOKS LIKE IT WILL MOVE EAST ON WEDNESDAY WITH YET ANOTHER TROUGH MOVING THROUGH SOUTHERN CANADA ON THU/FRI. THOUGH THE FLOW ALOFT BECOMES MORE WESTERLY BY THURSDAY...THE SHORTWAVE MOVING THROUGH ON THU/FRI WILL KEEP A CHANCE OF AFTERNOON/EVENING STORMS IN FORECAST THROUGH FRI. WITH NORTHWEST FLOW BY SAT...SHOULD BE DRYING OUT THEN. CCF NUMBERS GTF BB 055/078 050/078 048 04522 CTB BB 050/075 047/075 045 04221 HLN BB 054/080 051/080 050 04522 BZN BB 051/080 047/080 047 04431 WEY BB 046/075 042/076 042 04432 DLN BB 049/077 043/077 044 04421 HVR EB 060/088 054/088 052 04532 LWT EB 056/077 048/077 046 04632=
In the hours before
Local storm report, Jul 21, 5:10 PM MST, 1 hour 45 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
610 PM MDT SAT JUL 21 2001
TIME(MDT) .....EVENT LOCATION..... ST ...EVENT/REMARKS...........
.....COUNTY LOCATION.....
0315 PM 3 E ILIAD MT 1.50 INCH HAIL
07/21/01 CHOUTEAU
0330 PM 10 NE STANFORD MT 0.75 INCH HAIL
07/21/01 JUDITH BASIN
0420 PM 7 NE DENTON MT 1 INCH HAIL
07/21/01 FERGUS
0445 PM 8 N STANFORD MT 1 INCH HAIL
07/21/01 JUDITH BASIN
0505 PM SUFFOLK MT 1 INCH HAIL
07/21/01 FERGUS
BRUSDA
NNNNThe radar
The national radar mosaic for the moment the first event began.
Event by event
1 hail. Local standard time, as filed.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Heat in Illinois, July 21 to 24, 2001
- Heat in Missouri, July 21 to 24, 2001
- Heat in Wisconsin, July 21 to 22, 2001
- Lightning Strike in Michigan, July 21, 2001
- Flash Flood and Flood in Illinois, July 21, 2001
- Flash Flooding and Hail in Montana, July 21 to 22, 2001
- Lightning Strike in Alabama, July 21, 2001
- Damaging Wind in South Dakota, July 21, 2001
- Damaging Winds in Michigan, July 21, 2001
- Hail and Damaging Winds in Minnesota, July 21, 2001
- Flood in Alaska, July 21 to 23, 2001
- Damaging Wind in Florida, July 21, 2001
More
Every storm in Montana in 2001Every state in 2001This day in weather historyWarnings in Montana, July 2001
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5266036.