Alert archive / Montana / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 27, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 11, 1993, 8:29 PM MDT for Chouteau County, Fergus County, Montana. It was in force for 61 min.
The area
The counties it named.
The facts
- Issued
- Jul 11, 1993, 8:29 PM MDT (02:29 UTC)
- Expired
- Jul 11, 1993, 9:30 PM MDT
- In force
- 61 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Chouteau County, MT, Fergus County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 2.5 hours before the alert went out and 59 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
- 144 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1846 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 258 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
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.
In the hours before
Special weather statement, Jul 11, 4:45 PM MDT, 3 hours 44 minutes before
MTZ003-120400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 445 PM MDT SUN JUL 11 1993 ...THUNDERSTORMS DEVELOPING OVER THE NORTHWEST CHINOOK ZONE... LATE THIS AFTERNOON RADAR AND SATELLITE PICTURES INDICATED SEVERAL THUNDERSTORMS BREAKING ACROSS THE PLAINS JUST EAST OF THE NORTHERN ROCKIES. AT 445 PM ONE STORM WAS LOCATED BETWEEN BROWNING AND CUTBANK ...A SECOND THUNDERSTORM WAS SEEN JUST SOUTHWEST OF CONRAD...AND A THIRD STORM WAS SOUTH OF CHOTEAU. THESE THUNDERSTORMS WERE MOVING GENERALLY EASTWARD ABOUT 15 MPH. BEFORE 4 PM A BROWNING OBSERVER REPORTED SMALL HAIL AND HEAVY RAIN. RADAR INDICATES THESE STORMS CAPABLE OF STONG WINDS...HAIL AND HEAVY RAIN. AN UPPER LEVEL LOW PRESSURE CENTER OVER NORTHWEST WASHINGTON WAS STEERING MOIST UNSTABLE AIR FROM THE SOUTHWEST INTO WESTERN MONTANA LATE TODAY AND FURTHER THUNDERSTORM DEVELOPMENT IS EXPECTED OVER WESTERN MONTANA...WITH A FEW STORMS MOVING EASTWARD ACROSS THE STATE OVERNIGHT. ANY SEVERE WEATHER REPORTS SHOULD BE RELAYED TO THE NATIONAL WEATHER SERVICE IN GREAT FALLS AT 453-2081...OR TO THE NEAREST LAW ENFORCEMENT AGENCY. RH NNNN
Special weather statement, Jul 11, 4:51 PM MDT, 3 hours 38 minutes before
MTZ003-120400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 445 PM MDT SUN JUL 11 1993 ...THUNDERSTORMS DEVELOPING OVER THE NORTHWEST CHINOOK ZONE... LATE THIS AFTERNOON RADAR AND SATELLITE PICTURES INDICATED SEVERAL THUNDERSTORMS BREAKING ACROSS THE PLAINS JUST EAST OF THE NORTHERN ROCKIES. AT 445 PM ONE STORM WAS LOCATED BETWEEN BROWNING AND CUTBANK ...A SECOND THUNDERSTORM WAS SEEN JUST SOUTHWEST OF CONRAD...AND A THIRD STORM WAS SOUTH OF CHOTEAU. THESE THUNDERSTORMS WERE MOVING GENERALLY EASTWARD ABOUT 15 MPH. BEFORE 4 PM A BROWNING OBSERVER REPORTED SMALL HAIL AND HEAVY RAIN. RADAR INDICATES THESE STORMS CAPABLE OF STONG WINDS...HAIL AND HEAVY RAIN. AN UPPER LEVEL LOW PRESSURE CENTER OVER NORTHWEST WASHINGTON WAS STEERING MOIST UNSTABLE AIR FROM THE SOUTHWEST INTO WESTERN MONTANA LATE TODAY AND FURTHER THUNDERSTORM DEVELOPMENT IS EXPECTED OVER WESTERN MONTANA...WITH A FEW STORMS MOVING EASTWARD ACRO SS THE STATE OVERNIGHT. ANY SEVERE WEATHER REPORTS SHOULD BE RELAYED TO THE NATIONAL WEATHER SERVICE IN GREAT FALLS AT 453-2081...OR TO THE NEAREST LAW ENFORCEMENT AGENCY. RH NNNN
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 6:25 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 70 min |
| Jul 11, 7:24 PM MDT | Tornado Warning | TFX | Chouteau | 56 min |
| Jul 11, 9:15 PM MDT | Tornado Warning | TFX | Cascade | 60 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1993Every severe thunderstorm warning in 1993
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.