Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 291, NWS Twin Cities, MN

August 9, 1998Anoka County, Ramsey County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 9, 1998, 6:54 PM CDT for Anoka County, Ramsey County, Minnesota. It was in force for 61 min. 5 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: Aug 9, 1998, 6:54 PM CDT (23:54 UTC)
Expired: Aug 9, 1998, 7:55 PM CDT
In force: 61 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Anoka County, MN, Ramsey County, MN

The radar

The Minneapolis radar (KMPX), 45 km from the middle of the area, began a volume at 23:55 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	Remark
Aug 9, 6:56 PM CDT	Hail 0.88	Lino Lakes, MN
Aug 9, 7:05 PM CDT	Thunderstorm Wind 51	Anoka, MN
Aug 9, 7:50 PM CDT	Hail 0.75	St Paul, MN	Reported at the corner of Jefferson and Hamlin.
Aug 9, 7:56 PM CDT	Hail 1.25	St Paul, MN	Reported in Highland Park area.
Aug 9, 7:56 PM CDT	Hail 0.88	St Paul, MN	Reported at Cleveland and Ford Parkway.

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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.9 hours before the alert went out and 47 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: 720 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

756 
WUUS1 KMSP 092356 RRA
SVRMSP
MNC003-123-100055-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
654 PM CDT SUN AUG 9 1998

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES/CHANHASSEN HAS
ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA
  RAMSEY COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 755 PM CDT

* AT 700 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL AND DAMAGING WINDS NEAR BLAINE OR 13 MILES NORTH OF
  MINNEAPOLIS.  THE STORM WAS MOVING SOUTHEAST AT 20 MPH.

* SOME LOCATIONS AFFECTED
    FRIDLEY
    ST. PAUL
    LEXINGTON
    WHITE BEAR LAKE
    ROSEVILLE

DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.


MBK

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 5:15 PM CDT	Severe Thunderstorm Warning	MPX	Isanti	65 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.