Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 99, NWS Aberdeen, SD

July 14, 1998Big Stone County, Minnesota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 14, 1998, 6:55 PM CDT for Big Stone County, Minnesota. It was in force for 65 min. 3 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: Jul 14, 1998, 6:55 PM CDT (23:55 UTC)
Expired: Jul 14, 1998, 8:00 PM CDT
In force: 65 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Big Stone County, MN

The radar

The Aberdeen radar (KABR), 156 km from the middle of the area, began a volume at 23:54 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.

What was reported inside it

Time	Report	Where
Jul 14, 7:15 PM CDT	Hail 2.75	Johnson, MN
Jul 14, 7:25 PM CDT	Hail 1	Johnson, MN
Jul 14, 7:45 PM CDT	Hail 2.75	Clinton, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 14, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 14, 4:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.9 hours before the alert went out and 167 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3567 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 1148 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.5

Open this sounding in Storm Lab

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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 14, 9:48 AM CDT, 9 hours 7 minutes earlier.

Area forecast discussion, Jul 14, 9:48 AM CDT, 9 hours 7 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/NORTH CENTRAL/NORTHEAST SD
AND FOR TRAVERSE/BIG STONE COUNTIES OF MN
NATIONAL WEATHER SERVICE ABERDEEN SD
948 AM CDT TUE JUL 14 1998

COLD FRONT ACROSS WESTERN SD THIS MORNING WILL MOVE EAST INTO VERY
UNSTABLE AIRMASS ACROSS EAST RIVER COUNTIES IN THE ABR CWA. WITH DWPTS
IN THE LOWER TO MID 70S AND TEMPS RISING INTO THE 90S
...AIRMASS...ESPECIALLY ACROSS NE SD INTO WC MN WILL BECOME VERY
UNSTABLE WITH ABRS MODIFIED SOUNDING SHOWING CAPES WELL OVER 5000 J/KG.
WIND SHEAR IS NOT THAT GREAT...BUT WITH THIS KIND OF INSTABILITY...
SOME SEVERE THUNDERSTORMS COULD DEVELOP AS COLD FRONT MOVES EAST WITH
THE MAIN THREAT BEING DAMAGING WINDS AND LARGE HAIL. BELIEVE CA<P ABOVE
THE SURFACE WILL BE OVERCOME BY LIFT. WILL UPDATE FORECAST TO INCREASE
POPS EAST RIVER AND ADD POSSIBLY SEVERE. WILL LEAVE HIGHS AND WINDS
FORECAST PRETTY MUCH ALONE.

MOHR

In the hours before

Special weather statement, Jul 14, 4:01 PM CDT, 2 hours 54 minutes before

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The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 7:42 PM CDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley	63 min
Jul 14, 6:42 PM CDT	Severe Thunderstorm Warning	ABR	Traverse	48 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1998 Every severe thunderstorm warning in 1998

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; radar from the NEXRAD Level II archive.