Alert archive / Minnesota / Severe Thunderstorm Warnings in 1988
Severe Thunderstorm Warning 24, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 18, 1988, 7:12 PM CDT for Mahnomen County, Norman County, Polk County, Minnesota. It was in force for 63 min. 4 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 18, 1988, 7:12 PM CDT (00:12 UTC)
- Expired
- Jun 18, 1988, 8:15 PM CDT
- In force
- 63 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
Counties Mahnomen County, MN, Norman County, MN, Polk County, MN
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 18, 7:40 PM CDT | Hail 1.25 | Norman, MN | |
| Jun 18, 7:50 PM CDT | Thunderstorm Wind 0 | Norman, MN | |
| Jun 18, 7:57 PM CDT | Thunderstorm Wind 61 | Norman, MN | |
| Jun 18, 8:15 PM CDT | Hail 2 | Norman, MN |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 0.2 hours before the alert went out and 249 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
- 882 J/kg
- Mixed-layer CIN
- -151 J/kg
- Mixed-layer LCL
- 1984 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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, Jun 18, 5:32 PM CDT, 1 hour 40 minutes before
SPECIAL WEATHER STATEMENT RADAR SUMMARY NATIONAL WEATHER SERVICE FARGO ND 535 PM CDT SAT JUN 18 1988 ...SEVERE THUNDERSTORM WATCH FOR EASTERN NORTH DAKOTA...NORTHWEST AND WEST CENTRAL MINNESOTA UNTIL 1000PM CDT. AT 525 PM CDT...AN ISOLATED STRONG THUNDERSTORM HAD DEVELOPED RAPIDLY OVER EAST CENTRAL NORTH DAKOTA 50 MILES SOUTHWEST OF GRAND FORKS. THIS STORM WILL MOVE THROUGH THE ANETA...SHARON/FINLEY AREAS BY 630 PM CDT. THIS STORM COULD PRODUCE BRIEF HEAVY RAIN...DANGEROUS LIGHTNING AND STRONG WINDS. MOVEMENT OF THIS STORM WAS EAST AT 45 MILES AN HOUR. ELSEWHERE...SCATTERED SHOWERS AND THUNDERSTORMS...A FEW WITH HEAVY RAIN CONTINUED OVER NORTHEAST NORTH DAKOTA...NORTHWEST AND NORTH CENTRAL MINNESOTA. MOVEMENT WAS EAST AT 45 MILES AN HOUR. VOELKER
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 7:17 PM CDT | Tornado Warning | FGF | Traill | 58 min |
| Jun 18, 7:35 PM CDT | Tornado Warning | FGF | Mahnomen, Norman | 55 min |
| Jun 18, 7:45 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater | 60 min |
| Jun 18, 8:15 PM CDT | Severe Thunderstorm Warning | FGF | Mahnomen, Norman, Polk | 60 min |
| Jun 18, 9:24 PM CDT | Severe Thunderstorm Warning | FGF | Hubbard | 66 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1988Every severe thunderstorm warning in 1988
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.