Alert archive / Minnesota / Tornado Warnings in 1987
Tornado Warning 11, NWS Grand Forks, ND
NWS Grand Forks, ND issued this tornado warning at Jul 21, 1987, 7:58 PM CDT for 4 counties in Minnesota. It was in force for 62 min. 1 report 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
- Jul 21, 1987, 7:58 PM CDT (00:58 UTC)
- Expired
- Jul 21, 1987, 9:00 PM CDT
- In force
- 62 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
Counties Becker County, MN, Clay County, MN, Mahnomen County, MN, Otter Tail 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 |
|---|---|---|---|
| Jul 21, 8:00 PM CDT | Thunderstorm Wind 0 | Clay, 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, 1.0 hours before the alert went out and 271 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1603 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 220058 TORFAR MNC005-027-087-111-220200- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE FARGO ND 758 PM CDT TUE JUL 21 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHWEST MINNESOTA...BECKER...EASTERN CLAY...MAHNOMEN AND NORTHERN OTTER TAIL TO INCLUDE DETROIT LAKES...MAHNOMEN...PELICAN RAPIDS...HITTERDAHL AND BARNESVILLE. AT 745 PM CDT FUNNEL CLOUDS WERE REPORTED BY SHERIFFS DEPARTMENT 20 MILES EAST AND SOUTH OF THE FARGO/MOORHEAD AREA OR AT HITTERDAHL AND BARNESVILLE MINNESOTA. IF YOU ARE IN AN AREA THREATENED BY THE STORM...GO TO A REIN~FORCED SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL... VERY HEAVY RAIN...AND DANGEROUS LIGHTNING. THIS STORM IS ACCOMPANIED BY INTENSE LIGHTNING...LARGE HAIL...AND DANGEROUS STRAIGHT LINE WINDS. VOELKER
What forecasters said that day
The local office's own words before this tornado 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 21, 3:38 PM CDT, 4 hours 20 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE FARGO ND 335 PM CDT TUE JUL 21 1987 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT THIS TUESDAY EVENING FOR A LARGE PART OF NORTH DAKOTA AND A PART OF NORTHWEST MINNESOTA... AT 325 PM CDT...A PAIR OF INTENSE THUNDERSTORMS WERE LOCATED 30 MILES AND 50 MILES NORTHWEST OF JAMESTOWN NORTH DAKOTA OR NEAR THE TOWNS OF NEW ROCKFORD AND CARRINGTON. THESE THUNDERSTORMS WERE MOVING TO THE EAST AT 40 MILES AN HOUR AND WILL MOVE INTO GRIGGS AND SOUTHERN NELSON COUNTIES BY 425 PM CDT. PERSONS LIVING IN THESE AREAS...ESPECIALLY THE TOWNS OF COOPERSTOWN...HANNAFORD...AND DAZEY SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND SHOULD BE PREPARED TO SEEK SHELTER IF NECESSARY. ALSO AT 325 PM CDT...SCATTERED SHOWERS AND THUNDERSTORMS...SOME WITH HEAVY RAIN...WERE LOCATED OVER NORTHEAST AND CENTRAL NORTH DAKOTA. THESE SHOWERS AND THUNDERSTORMS W(ERE ALSO MOVING TO THE EAST AT 40 MILES AN HOUR. MB
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:02 PM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 58 min |
| Jul 21, 8:38 PM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk | 62 min |
| Jul 21, 8:45 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater | 60 min |
| Jul 21, 9:00 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Hubbard, Wadena | 60 min |
| Jul 21, 11:26 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 49 min |
| Jul 22, 12:15 AM CDT | Severe Thunderstorm Warning | FGF | Mahnomen, Norman | 50 min |
| Jul 22, 1:21 AM CDT | Severe Thunderstorm Warning | FGF | Becker, Mahnomen, Norman | 54 min |
| Jul 22, 1:30 AM CDT | Severe Thunderstorm Warning | FGF | Clearwater | 75 min |
| Jul 22, 1:53 AM CDT | Severe Thunderstorm Warning | FGF | Norman | 52 min |
| Jul 22, 1:53 AM CDT | Severe Thunderstorm Warning | FGF | Clay | 52 min |
Nearby
Tornado Warnings in Minnesota, 1987Every tornado warning in 1987Tornadoes in 1987
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.